VHF-Transceiver

Family

AR6201-(X1X)
AR6201-(X2X)
RT6201-(X10)
AR6201
RT6201-(X20)
RCU6201-(X1X)
RCU6201
AR6203-(X1X)
AR6203-(X2X)
RT6201 Software Versions:
SCI1050S305 Version 3.07
SCI1051S305 Version 1.51
and upwards
AR6203

Installation
Operation

Manual DV 14307.03
Issue 1 September 2013

Becker Avionics GmbH ● Baden Airpark B108 ● 77836 Rheinmünster ● Germany

Telephone +49 (0) 7229 / 305-0 ● Fax +49 (0) 7229 / 305-217

http://www.becker-avionics.com ● e-mail: info@becker-avionics.de

 FIRST ISSUE AND CHANGES

Issue 1 September 2013

LIST OF EFFECTIVE PAGES

Page No.: Date: Page No.: Date:

Cover Page 09/2013

I … VIII 09/2013

1-1 … 1-20 09/2013

2-1 … 2-66 09/2013

3-1 … 3-20 09/2013

DV 14307.03 / Article Number 0638.404-071

© 2013 by Becker Avionics GmbH / All rights reserved

 AR6201 - RT6201 - RCU6201 - AR6203
Preface

Dear Customer,

Thank you for purchasing BECKER products.

We are pleased that you have chosen our product and we are confident
that it will meet your expectations.

AR620X-(XXX) VHF Transceivers are a modern family of communication

equipment that have comprehensive capabilities and significantly extend
the typical aeronautical transceivers.

Despite its small size and weight 620X- aircraft radio include inter
alia:

· Sensitive receiver which meets the most recent requirements of ED-

23C, including the ability to work in the offset-carrier (climax)
operation in 25 kHz and 8.33 kHz channel spacing (class H2).

· Receiver that includes SCAN (dual watch) mode. This allows

simultaneous monitoring of two different VHF frequency channels
without interrupting communication on the active frequency.

· High efficiency transmitter which delivers more than 10W modulated or

un-modulated output power at 28V supply voltage or 6W at 12V. Low
power consumption allows longer operation from battery.

· Extended built-in intercom which can work as:

o 4-way intercom with isolation mode – passengers could continue

conversation or listening to music from MP3 player at the same
time as pilots talk via intercom or communicate with the tower.

o 2-way intercom for tandem operation – pilot and co-pilot work

with separate controllers and can control their individual
audio parameters, like volume or VOX. This mode is preferred
especially for training due to full synchronization of LCD
contents.

· Non-volatile memory for storing:

o 99 VHF channels can manually be labeled for storage of VHF

channels

o 9 recently selected VHF channels are automatically stored

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Table of Contents

List of Abbreviations VI

Section 1 GENERAL DESCRIPTION 1-1

1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 General Notes 1-2
1.4 Variants Overview 1-2
1.5 Short Description 1-3
1.5.1 AR6201 Single Block Transceiver 1-4
1.5.2 RT6201 Remote Transceiver 1-4
1.5.3 RCU6201 Remote Control Unit 1-5
1.5.4 AR6203 Single Block Transceiver 1-6
1.6 Features Overview 1-6
1.7 Technical Data 1-9
1.7.1 Power Supply Data 1-9
1.7.2 General Data 1-10
1.7.3 Dimensions & Weight 1-11
1.7.4 Receiver Data for AR620X and RT6201 1-11
1.7.5 Transmitter Data AR620X and RT6201 1-12
1.7.6 Emergency Operation 1-12
1.7.7 Software 1-13
1.7.8 Complex Hardware 1-13
1.7.9 Regulatory Compliance 1-13
1.8 Environmental Qualification AR620X and RCU6201 1-14
1.9 Environmental Qualification RT6201 1-16
1.10 Accessories 1-18

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Section 2 INSTALLATION 2-1

2.1 Limitations 2-1
2.2 Unpacking the Equipment and Preparation for
Installation 2-1
2.3 Mechanical Installation 2-1
2.3.1 AR6201 and RCU6201 Installation 2-1
2.3.2 AR6203 Installation 2-3
2.3.3 RT6201 Installation 2-5
2.4 Electrical Interface 2-8
2.4.1 Connectors and Pin Assignment for AR6201, AR6203
and RT6201 2-8
2.4.2 Inputs / Outputs Detailed Description 2-11
2.4.3 Connector and Pin Assignment for RCU6201 2-16
2.5 Installation and Configuration of 620X Transceivers 2-17
2.6 Antenna Installation 2-18
2.7 Installation Setup for RT/AR6201-(X1X) 2-19
2.7.1 Entering Installation Setup 2-19
2.7.2 Leaving Installation Setup 2-19
2.7.3 Page Up / Page Down in the Installation Setup 2-19
2.7.4 Storage of Setup Data 2-19
2.7.5 Terminate Installation Setup 2-19
2.7.6 VU Meter 2-20
2.7.7 Installation Setup Pages - Data Description 2-20
2.8 Factory Default Settings 2-35
2.9 Typical Installations with Recommended Settings and
Wiring Diagrams 2-37
2.9.1 Single Seat Glider 2-37
2.9.2 Twin Seat Motor Glider 2-40
2.9.3 General Aviation (GA) Aircraft using Standard
Microphones 2-42
2.9.4 Installation Setup for individual dual headset
configuration (two IC circuit) 2-44

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2.9.5 Installation Setup for Twin Seat with AR6201 Tandem

Configuration 2-46
2.9.6 Wiring for Aircraft with Four Seats (no TANDEM) 2-48
2.9.7 Installation with RT6201 2-51
2.9.8 Aircraft with Intercom System 2-52
2.9.9 Installation Setup for Twin Seat with RT6201 Tandem
Configuration 2-55
2.10 Retrofitting an AR4201 with an AR620X 2-57
2.10.1 Pin Compatibility 2-57
2.10.2 Dynamic Microphone Input 2-59
2.10.3 Temperature Sensor 2-59
2.10.4 RS-232 Interface 2-59
2.10.5 AFCU/AGC/AFWB 2-60
2.10.6 CPIN 2-60
2.10.7 +13.75V Switched 2-60
2.10.8 PWR_EVAL 2-60
2.11 Post Installation Tests 2-60
2.11.1 Mechanical Installation and Wiring Check 2-60
2.11.2 Power Supply 2-60
2.11.3 Receiver / Transmitter Operation 2-61
2.11.4 Antenna Check 2-61
2.11.5 Interference Check 2-61
2.11.6 Flight Test Check 2-63
2.12 Trouble Shooting 2-63
2.13 Continued Airworthiness 2-65

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Section 3 OPERATION 3-1

3.1 Safety Instructions 3-1
3.2 Controls and Indicators 3-2
3.2.1 Controls 3-2
3.2.2 Symbols Shown on the Display 3-3
3.3 Start-Up 3-3
3.4 Receive and Transmit Mode 3-4
3.4.1 Receive Mode 3-4
3.4.2 Transmit Mode 3-4
3.5 Frequency Selection Modes 3-5
3.5.1 Standard Mode 3-5
3.5.2 Direct Tune Mode 3-6
3.5.3 Channel Mode 3-7
3.5.4 Scan Mode 3-9
3.6 Squelch 3-10
3.7 RX Field Strength Indication 3-10
3.8 Channel Spacing Mode 3-11
3.9 Storage Function 3-11
3.9.1 Manual Storage Function 3-11
3.9.2 Automatic Storage Function 3-13
3.10 Auxiliary Audio Input 3-13
3.11 Intercom Operation 3-13
3.12 VOX & Speaker Operation 3-15
3.13 Menus 3-15
3.13.1 Intercom Menu 3-15
3.13.2 Pilots Menu 3-17
3.14 Warning and Failure Indications 3-18

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List of Abbreviations
AC ..... Alternating Current

AF ..... Audio Frequency

AR ..... Airborne Radio

ATT .... Attenuation

AUX .... Auxiliary

AWG .... American Wire Gauge

BNC .... Bayonet Neill Concelman

CBIT ... Continuous Built-In Test

CFG .... Configuration

CH ..... Channel

CM ..... Chassis Module

COM .... Communication

DC ..... Direct Current

EASA ... European Aviation Safety Agency

EMI .... Electro Magnetic Interference

ETSO ... European Transmission System Operators

GND .... Ground (Aircraft Ground)

GPS .... Global Positioning System

HMI .... Human Machinery Interface

HIRF ... High Intensity Radiated Fields

IC ..... Intercom

I&O .... Installation & Operation

LCD .... Liquid Crystal Display

MFD .... Multi-Function Display

M&R .... Maintenance & Repair

N/A .... Not Applicable

NAV .... Navigation

PBIT ... Power-On Built In Test

PTT .... Push To Talk

PWR .... Power

RCU .... Remote control unit

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RSSI ... Received Signal Strings Indication

RT ..... Remote Transceiver

RX ..... Receive

SQL .... Squelch

SPKR ... Speaker (Loudspeaker)

SRC .... Source

SW ..... Software

TSO .... Technical Standard Order

TX ..... Transmit

VOX .... Voice Operated IC Threshold

VHF .... Very High Frequency

VDC .... Voltage Direct Current

VSWR ... Voltage Standing Wave Ratio

VU ..... Volume Unit

Units
V ...... Volt

mV ..... Millivolt

A ...... Ampere

mA ..... Milliampere

W ...... Watt

mW ..... Milliwatt

kHz .... Kilohertz

MHz .... Megahertz

s ..... Second

dBm .... Power ratio in decibels

dB ..... Decibel

Ohm(W) . Resistor

kg ..... Kilogram

t ...... Tons

°C ..... Degree Celsius

mm ..... Millimeter

cm ..... Centimeter

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Blank

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Section 1 GENERAL DESCRIPTION

1.1 Introduction

This manual describes the operation and installation of the

RCU/RT/AR6201 VHF Transceiver Family equipment. The ID label on your
device shows the part number for identification purposes.

Before starting to operate the unit(s) please read this manual carefully
with particular attention to the description referring to your
device(s). This manual also contains several optional elements of the
system (second controller for example), that may not be contained in
your delivery package and in that case are not applicable.

For simplification of this document the short version “620X” for VHF
transceivers and “RCU6201” for the remote controllers will be used
instead of the full part number identification.

The manuals DV 14307.03 I&O (“Installation and Operation”) and DV

14307.04 M&R (“Maintenance and Repair”) contain the following sections:

DV 14307.03 DV 14307.04
Section
I&O M&R

1 General X X

2 Installation X X

3 Operation X X

4 Theory of Operation N/A X

5 Maintenance and Repair N/A X

6 Illustrated Parts List N/A X

7 Modification and Changes N/A X

8 Circuit Diagrams N/A X

1.2 Purpose of Equipment

The 620X transceivers enable voice communication between aircrafts or

between aircraft and ground using the very high frequency band between
118.000 to 136.9916 MHz respectively 136.9750 with a selectable channel
spacing of 25 kHz respectively 8.33 kHz. The wide scope of accessories
also allows usage of the 620X VHF transceivers in ground-based
applications.

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The 620X-(XXX) Transceiver Family is dedicated to applications where low
power consumption is required. They are capable to operate from standard
14 VDC and 28 VDC installations and from 12 VDC or 24 VDC batteries.

Ultra low power consumption with extremely wide DC supply voltage range
as well as compact and lightweight design allows application for gliders
and leisure aircraft up to 2000 kg and balloons.

Built-in 4-seat configurable intercom, transmitter output power up to

10W and option for connection of two controllers in tandem
configurations extends the flexibility of 620X VHF transceivers.

The 620X transceivers also provide additional options such as:

· Intercom functionality for voice communication between aircraft crew

and passengers

· Squelch functionality that automatically mutes receiver audio signal

until clear signal is received to avoid unwanted audio noise

· Scan functionality for simultaneous monitoring of two VHF channels

(receive mode)

· AUX audio input for connection of additional audio devices like

navigation receiver, warning tone generator or MP3 music player.

· VHF channel database for easy access to predefined frequency channels

· Tandem functionality for synchronized operation of two controllers

1.3 General Notes

In this document the word “frequency” is also used in the sense of

“channel name”, as defined in EUROCAE, ED-23B: chapter 1.3.2.

In this document the word “memory channel” or “channel” means a memory

place identified by a channel number, where a frequency may be stored
for later use.

1.4 Variants Overview

Within the part number, the meaning of “- (XXX)” is:

(0XX) indicates 8.33/25 kHz channel spacing capability

(1XX) indicates only 25 kHz channel spacing capability

(X1X) indicates transmit power 10W at 28V

(X2X) indicates transmit power 6W at 12V

(XX2) indicates white illumination color on a black panel

AR6201 Single Block Transceiver (refer to Figure 1-1)

Part Number Article No 8.33kHz Mode Transmit PWR

AR6201-(012) 0631.418-910 yes 10W at 28V

AR6201-(112) 0631.434-910 no 10W at 28V

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Part Number Article No 8.33kHz Mode Transmit PWR

AR6201-(022) 0636.339-910 yes 6W at 12V

AR6201-(122) 0636.355-910 no 6W at 12V

RT6201 Remote Transceiver (refer to Figure 1-2)

Part Number Article No 8.33kHz Mode Transmit PWR

RT6201-(010) 0631.442-910 yes 10W at 28V

RT6201-(020) 0636.312-910 yes 6W at 12V

RT6201–(110) 0638.609-910 yes 10W at 28V

RT6201-(120) 0638.617-910 yes 6W at 12V

RCU6201 Remote Control Unit (refer to Figure 1-3)

Part Number Article No 8.33kHz Mode Transmit PWR

RCU6201-(012) 0631.469-910 yes N/A

RCU6201-(112) 0631.485-910 no N/A

AR6203 Single Block Transceiver (refer to Figure 1-4)

Part Number Article No 8.33kHz Mode Transmit PWR

AR6203-(012) 0630.993-910 yes 10W at 28V

AR6203-(112) 0631.566-910 no 10W at 28V

AR6203-(022) 0636.371-910 yes 6W at 12V

AR6203-(122) 0636.398-910 no 6W at 12V

1.5 Short Description

For Single Configuration the Following Combinations apply:

· AR6201 or AR6203 Single Block Transceiver

· RT6201 Remote VHF Transceiver with controller RCU6201

For Tandem Configuration the Following Combinations apply:

· AR6201 or AR6203 Single Block Transceiver with additional controller

RCU6201

· RT6201 Remote VHF Transceiver with controller RCU6201 and additional

second controller RCU6201

In tandem configuration two controllers and one transceiver are

connected. Tandem configuration is useful for training purposes where

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pilot and student have their own controller with full-synchronized views
or as separate controllers for pilot and co-pilot.

1.5.1 AR6201 Single Block Transceiver

The AR6201 Single Block Transceiver is a compact and lightweight unit

designed for operation in a cockpit environment for both general
aviation aircraft and helicopters. The dimensions correspond to the
standard instrument diameter of 58 mm (2 ¼ inch). All controls and
indicators are located on the front panel.

The equipment connectors and the antenna socket are located at the rear
of the units.

The AR6201 should be mounted by means of four screws (rear panel

installation).

Figure 1-1: AR6201 Single Block Transceiver; 58 mm (2 ¼ inch)

standard instrument cut-out

1.5.2 RT6201 Remote Transceiver

The RT6201 Remote Transceiver is a compact and lightweight single block

unit in rectangular shape that contains a VHF transceiver. The
dimensions correspond to the standard instrument diameter of 58 mm (2 ¼
inch).

The RT6201 Remote Transceiver can be controlled via its dedicated

controller RCU6201 or by a third party controller via MFD (BECKER
proprietary protocol required).

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Figure 1-2: RT6201 Remote Single Block VHF transceiver,

back panel installation

The RT6201 Remote Transceiver is installed by means of the attached

mounting provisions and four screws (back panel installation).

1.5.3 RCU6201 Remote Control Unit

The RCU6201 Remote Control Unit is a compact and lightweight unit. The
dimensions correspond to the standard instrument diameter of 58 mm (2 ¼
inch).

All controls and indicators are located on the front panel. The
equipment connectors are located at the rear of the units.
The controller RCU6201 should be mounted with four screws (rear panel
installation).

Figure 1-3: RCU6201 Remote Control Unit; 58 mm (2 ¼ inch)

standard instrument cut-out

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1.5.4 AR6203 Single Block Transceiver

The AR6203 Single Block Transceiver is designed as a single block unit.

AR6203 is designed for operation in a cockpit environment for both
general aviation aircraft and helicopters. The dimensions correspond to
the state-of-the-art 160mm (6.3 “) panel mounted design.

Figure 1-4: AR6203 Single Block Transceiver

All control elements are located on the front panel of the unit. For
connection to the aircraft inter-wiring two 25-pin unit connectors and
BNC antenna socket are located at the rear of the unit.

The AR6203 should be mounted with the designated mounting kit MK6403-1
(refer to chapter 1.10). Six holes on both sides of the mounting kit
frame enable the device to be mounted in the aircraft cockpit.

1.6 Features Overview

Frequency Indication

A liquid crystal display (LCD) provides the frequency indication. The

required operating frequency is set with the rotary knob. The relation
between the real operating frequency and the displayed frequency is
according to standards (ED-23B, chapter 1.3.2). For an overview, refer
to the table below.

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Operating Channel Displayed Frequency

Frequency Spacing 8.33 + 25 kHz 25 kHz only
(MHz) (kHz) mixed Mode Mode

118.0000 25 118.000 118.00

118.0000 8.33 118.005 N/A

118.0083 8.33 118.010 N/A

118.0166 8.33 118.015 N/A

118.0250 25 118.025 118.02

etc. etc. etc. etc.

136.9750 25 136.975 136.97

136.9750 8.33 136.980 N/A

136.9833 8.33 136.985 N/A

136.9916 8.33 136.990 N/A

Audio Outputs

The 620X VHF Transceiver includes four fully configurable outputs:

· Headphone 1 output, rated output power is 300 mW into 75 Ohm.

· Headphone 2 output, rated output power is 200 mW into 75 Ohm.

· Speaker output, rated output power is 4 W into 4 Ohm.

· LINE-OUT output intended for ground station use only

Note: Headphone 2 and speaker output cannot be active at the same time

Mike Inputs

The VHF transceiver has an input for dynamic microphone (DYN_MIKE) and
an input for standard microphone (STD_MIKE).

The 620X VHF Transceiver provides four microphone inputs:

· standard microphone input 1 (STD_MIKE1)

· standard microphone input 2 (STD_MIKE2)

· standard microphone input 3 (STD_MIKE3)

· dynamic microphone input (DYN_MIKE)

Each input is able to operate with one single microphone or with two
microphones of the same type connected in parallel.

AF Auxiliary Input

The AF auxiliary provides the interface to connect an external audio

source (e.g. NAV, music-player) to the transceiver. Interconnection of
multiple external audio sources on this particular port requires

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additional external decupling/isolation resistors. The external audio is
audible only when the transceiver is in receive mode.

The individual audio volume is set directly at the particular external

equipment.

Sidetone

The sidetone is available on the headphone output during transmission.

The sidetone volume automatically adapts to the intercom volume setting.

Squelch Operation

When enabled the squelch (muting) circuit suppresses weak signals. There
are two kinds of squelch methods implemented: carrier squelch and noise
squelch. The carrier squelch depends on received signal strength and is
adjustable in the installation setup; the noise squelch depends on
detected noise level and is adjustable in the pilot setup.

Memory Channels

The memory function allows storage of up to 99+9 frequencies. This

memory may contain up to 99 frequencies stored manually or programmed
from PC that can be labeled with VHF channel numbers or assigned text
label. Additionally the last recently used (active) 9 frequencies are
stored automatically as “LAST” channels. A user defined text label can
also be assigned for each stored frequency.

Intercom Operation

Aircraft internal communication via connected headsets is provided by

the built-in intercom circuit. The 620X has two intercom circuits:
“Front row” and “Back row”. A maximum of four headsets can be connected
(for example pilot & copilot on first circuit and two passengers on
second circuit).

Scan Mode

In scan mode a dual watch function is provided. The device is capable of

monitoring frequencies on two channels, active & preset simultaneously.
The signal of the active frequency will always be audible, since it will
have priority at all times.

Tandem operation

Tandem mode enables operation of two controllers simultaneously. The

controllers are synchronized, so that both display the same information

Illumination

The illumination of LCD and push buttons can be controlled either

directly from the front panel via the pilots menu or externally via the
dimming input lines. If the external dimming is selected, the

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illumination curve (brightness to voltage relation) can be adjusted in
the installation setup.

LOW BATT Indication

The VHF transceiver monitors power supply voltage. If the supply voltage
drops below the adjustable threshold, the display indicates the message
“LOW BATT”. If the power supply voltage drops further, emergency
operation mode is entered.

Emergency Operation

If the power supply voltage drops below 10.25 V, the VHF transceiver
continues operation with degraded performance. In case the power supply
drops below 9.0V the unit is automatically switched off.

Built-in Tests PBIT and CBIT

After power-up, the unit performs a self-test (power-up built-in test /

PBIT). During PBIT the transceiver displays “WAIT” and the corresponding
software versions of both the control head and chassis module.

If faults are detected during PBIT, the error message “FAILURE press any
key” is displayed. If no faults are detected the transceiver
automatically activates the mode set before last power-off.

During normal operation a continuous built-in test (CBIT) permanently

verifies the correct operation of the unit. If a problem is detected
during CBIT, an error message will be displayed.

Installation Setup

Configuration of the installation parameters such as mike sensitivity,

mike type selection, speaker enable/disable plus other parameters are
available via the installation setup.

Service Mode

The service mode is a special configuration mode accessible via RS422

interface with a proprietary serial data communication protocol. This
mode is for use by authorized maintenance organizations during aircraft
service on ground only.

1.7 Technical Data

1.7.1 Power Supply Data

For 620X units the following data applies:

Nominal supply voltage range .... 11.0 … 30.3 V

extended supply voltage range ... 10.25 V … 32.2V

Emergency operation ............. 9.0 V to 10.25 V

Dimming control ................. 0…14 V or 0…28 V

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Typical Power Consumption

AR620X AR620X RT6201 RT6201 RCU6201

(X2X) (X1X) (X2X) (X1X) (XXX)
6W 10W 6W 10W

≤ 0.10 ≤ 0.10 ≤ 0.10 ≤ 0.10 ≤ 0.10

Power “off” @ 12 VDC
mA mA mA mA mA

≤ 0.10 ≤ 0.10 ≤ 0.10 ≤ 0.10 ≤ 0.10

Power “off” @ 27.5 VDC
mA mA mA mA mA

Reception stand-by mode

@ 13.75 VDC, panel backlight ≤ 140 mA ≤ 140 mA ≤ 120 mA ≤ 120 mA ≤ 20 mA
off

Reception stand-by mode

@ 27,5 VDC, panel backlight ≤ 80 mA ≤ 80 mA ≤ 80 mA ≤ 80 mA ≤ 20 mA
off

1.8A at 1.8A at
Transmit mode 70% 70%
- - ≤ 20 mA
@ 13,75 VDC, VSWR=1:1 1.5A at 1.5A at
0% 0%

1.2A at 1.4A at 1.2A at 1.4A at

Transmit mode 70% 70% 70% 70%
≤ 20 mA
@ 27.5 VDC, VSWR=1:1 1.0A at 1.0A at 1.0A at 1.0A at
0% 0% 0% 0%

Absolute maximum current

≤ 3A - ≤ 2,9A - ≤ 20 mA
@ 13.75 VDC, VSWR=3:1

Absolute maximum current

≤ 2A ≤ 2.5A ≤ 1.9A ≤ 2.4A ≤ 20 mA
@ 27.5 VDC, VSWR=3:1

1.7.2 General Data

For 620X units the following data apply:

Frequency range ............... 118.000 MHz to 136.975 MHz (-1XX model)

118.000 MHz to 136.9916 MHz (-0XX model)

Channel spacing ............... 25 kHz (-1XX model)

8.33/25 kHz (-0XX model)

Number of channels ............ 760 (-1XX model)

2280 + 760 (-0XX model)

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Storage Temperature range ... -55°C to +85°C
Operating Temperature range .. -20°C to +55°C AR620X-(XXX) and RCU6201-(XXX)
-40°C to +55°C RT6201-(XXX)
short-time +70°C (all versions)
Operating Altitude ........... 35,000 ft
Vibration ................... Category S (Curve M) + Category U (Curve G)

1.7.3 Dimensions & Weight

AR6201-(XXX) AR6203-(XXX) RCU6201-(XXX) RT6201-(XXX)

Front 61.2mm 158.8mm 61.2 mm 61 mm

panel x 61.2 mm x 41.2 mm x 61.2 mm x 61 mm

207 mm
187.8 mm
(front plate
Depth of (front plate to
to end of 39.3 mm 188 mm
unit end of antenna
antenna
connector)
connector)

Mounting Kit
(back panel) (back panel)
MK6201-(010)
standard Mounting Kit standard
Mounting or directly
58 mm diameter MK6403-1 58 mm diameter
on avionic
(2¼ inch) (2¼ inch)
bay

Material AlMg AlMg/Plastic AlMg AlMg

Surface
Control-head coated with black matt paint
treatment

Weight 675g 850g 150g 600g

1.7.4 Receiver Data for AR620X and RT6201

Sensitivity ..................... ≤ -101 dBm for a (S+N)/N ratio of 6 dB

(nominal)
................................ ≤ -93 dBm for a (S+N)/N ratio of 6 dB
(qualified under environmental conditions)

Effective bandwidth ............. ≥ ± 2.78 kHz at the 6 dB points

(8.33 kHz channel spacing) ≤ ± 7.37 kHz at the 60 dB points

Effective bandwidth ............. ≥ ± 8 kHz at the 6 dB points

(25 kHz channel spacing) ≤ ± 22 kHz at the 60 dB points

Squelch ........................ level adjustable

AGC characteristic .............. ≤ 6 dB in range -93 dBm to 0 dBm

Distortion ...................... ≤ 15% at 30% 10dB below rated output power
≤ 15% at 70% and rated output power

Audio frequency response ........ ≤ 6 dB 350 Hz to 2500 Hz

(8.33 kHz channel spacing) ≥ 35 dB at 4000 Hz
Audio Noise ..................... ≤ 6 dB 300 Hz to 3400 Hz
≥ 18 dB at 4000 Hz

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Rated output for speaker operation .. ≥ 4 W into 4 Ohm

Rated output power for headphone 1 .. ≥ 300 mW into 75 Ohm

≥ 100 mW into 600 Ohm

Rated output power for headphone 2 .. ≥ 200 mW into 75 Ohm

≥ 100 mW into 600 Ohm

Audio auxiliary input ............... 50 mV to 8 V (adjustable) across 600 Ohm

Offset-carrier operation ........... YES (25 / 8.33 kHz)

1.7.5 Transmitter Data AR620X and RT6201

Output power into 50 Ohm ....... ≥ 6 W for AR620X-(X2X) and RT6201-(X2X)

(with and without modulation): . ≥ 10 W for AR620X-(X1X) and RT6201-(X1X)

Frequency tolerance ............. ≤ ±5 ppm

Duty cycle ...................... 120 sec (TX): 480 sec (RX)

Type of modulation .............. A3E

Modulation capability ........... ≥ 70%

Distortion ...................... ≤ 15%

Audio frequency response ........ ≤ 6 dB, 350 Hz to 2500 Hz

(8.33 kHz channel spacing)

Audio frequency response ........ ≤ 6 dB, 300 Hz to 2500 Hz

(25 kHz channel spacing)

Dynamic microphone .............. 1…20 mV compressor starting point,

adjustable
(with compressor) Input balanced, 200 Ω
Input range up to 20 dB above compressor
starting point.

Standard microphone(s) .......... 10…1000 mV compressor starting point,

adjustable
(with compressor) Input unbalanced, 150Ω
Input range up to 20 dB above compressor
starting point.

FM deviation with modulation .... ≤ 3 kHz

Sidetone ........................ Adjustable

Automatic shutdown of transmit mode 120 sec.

(Factory configurable 30 sec … 120 sec)

1.7.6 Emergency Operation

If the device enters emergency operation, the speaker is switched “OFF”
due to degraded performance. Depending on settings in installation setup
“LOW BATT” may be indicated if supply voltage drops below a predefined
threshold to indicate to the user, that he should connect his headset as
the speaker may be switched “OFF” soon).In this case, a headset is

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required to continue operation of the transceiver. This data is
applicable for AR620X and RCU6201.

Panel & Display Backlight ...... switched off for

TX Output Power ................. ≥ 2 W into 50 Ω (with modulation)

TX Modulation Depth ............. ≥ 50 %

RX Sensitivity .................. ≤-93 dBm for a (S+N)/N ratio of 6 dB

CAUTION: For power-supply voltages below 10.25 V the speaker output of

the transceiver will automatically be switched “OFF” without
further indication!

1.7.7 Software

The software for 620X and RCU6201 is as Level D in accordance with

EUROCAE/RTCA document ED12B/DO-178B.

1.7.8 Complex Hardware

The 620X devices do not contain complex hardware.

1.7.9 Regulatory Compliance

Note: Unauthorized changes or modifications to the 620X VHF

transceiver may void the compliance to the required regulatory
agencies and authorization for continued equipment usage.

AR6201 Single Block VHF Transceiver

Article FCC
Part Number EASA Approval TSO Approval
Number Approval

EASA.210.1249
ETSO-2C37e TSO-C169a
AR6201-(012) 0631.418-910 Class: D, E B54AR6201
Class: D, E, 4, 6
ETSO-2C38e
Class: 4, 6
EASA.210.1249 TSO-C169a
AR6201-(112) 0631.434-910 ETSO-2C37e Class: D B54AR6201
ETSO-2C38e Class: 4 Class: D, 4

EASA.210.1249
ETSO-2C37e TSO-C169a
AR6201-(022) 0636.339-910 B54AR6201
ETSO-2C38e Class: D, E, 4, 6
Class: D, E, 4, 6

EASA.210.1249
ETSO-2C37e Class: D TSO-C169a
AR6201-(122) 0636.355-910 B54AR6201
ETSO-2C38e Class: 4 Class: D, 4
Class: D, 4

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RT6201 Remote VHF Transceiver

Article FCC
Part Number EASA Approval TSO Approval
Number Approval

RT6201-(010) 0631.442-910 EASA. pending

ETSO-2C37e TSO-C169a
Class: D, E pending
Class: D, E, 4, 6
RT6201-(020) 0636.312-910 ETSO-2C38e
Class: 4, 6

RCU6201 Remote Control Unit

Article FCC
Part Number EASA Approval TSO Approval
Number Approval

EASA.210.1249
ETSO-2C37e TSO-C169a
RCU6201-(012) 0631.469-910 Class: D, E B54AR6201
Class: D, E, 4, 6
ETSO-2C38e
Class: 4, 6
EASA.210.1249 TSO-C169a
RCU6201-(112) 0631.485-910 ETSO-2C37e Class: D B54AR6201
ETSO-2C38e Class: 4 Class: D, 4

AR6203 Single Block VHF Transceiver

Article FCC
Part Number EASA Approval TSO Approval
Number Approval

EASA. Pending TSO-C169a

AR6203-(012) 0630.993-910 ETSO-2C169a pending
Class: D, E, 4, 6
Class: C, H2, 4, 6
EASA. pending
TSO-C169a
AR6203-(112) 0631.566-910 ETSO-2C169a pending
Class: C, 4
Class: C, 4

EASA. pending TSO-C169a

AR6203-(022) 0636.371-910 ETSO-2C169a pending
Class: C, H2, 4, 6 Class: D, E, 4, 6

EASA. pending TSO-C169a

AR6203-(122) 0636.398-910 ETSO-2C169a pending
Class: C, 4 Class: C, 4

1.8 Environmental Qualification AR620X and RCU6201

Under environmental test condition in accordance with the procedures set

forth in EUROCAE/RTCA Document ED-14F/DO-160F the following performance
has been demonstrated.

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Condition Section Cat. Description

Temperature and Altitude 4.0 C4

Ground Survival Low -55 deg C

Temperature

Short-Time Operating Low 4.5.1 -20 deg C

Temperature

Low Operating Temperature -20 deg C

C4
High Ground Survival +85 deg C
Temperature

High Short-Time Operating 4.5.2 +70 deg C

Temp.

High Operating Temp. +55 deg C

In-flight Loss of Cooling 4.5.5 - No forced cooling required

Altitude 4.6.1 35000 ft

Decompression 4.6.2 C4 N/A

Overpressure 4.6.3 N/A

Temperature Variation 5.0 B 5 deg C per minute

Humidity 6.0 A Standard

Fixed-wing and Helicopter,

Shock and Crash Safety 7.0 B
standard

Test curve M+G Fixed-wing +

Vibration 8.0 S+U
Helicopter

Explosion Proofness 9.0 - N/A

Water Proofness 10.0 Y -

Fluids Susceptibility 11.0 - N/A

Sand and Dust 12.0 - N/A

Fungus Resistance 13.0 - N/A

Salt Spray 14.0 - N/A

Magnetic Effect 15.0 Z 1 degree deflection at 0.3 m

DC installations with
Power Input 16.0 B battery of significant
capacity

High degree of protections

Voltage Spike 17.0 A
against voltage spikes

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Condition Section Cat. Description

DC installations with
Audio Freq. Conducted
18.0 B battery of significant
Susceptibility
capacity

Primary power DC or AC,

Induced Signal Susceptibility 19.0 AC
400Hz

Radio Frequency Interim high intensity

20.0 RW
Susceptibility radiated fields

Equipment where interference

Emission of Radio Frequency
21.0 B should be controlled to a
Energy
tolerable level

Pin test waveform A, level 3

Lightning Induced Transients
22.0 A1E3X Cable bundle test waveform
Susceptibility
E, level 3

Lightning Direct Effects 23.0 - N/A

Icing 24.0 - N/A

Equipment operated in an
Electrostatic Discharge 25.0 A
aerospace environment

Fire, Flammability 26.0 - N/A

1.9 Environmental Qualification RT6201

Under environmental test condition in accordance with the procedures set

forth in EUROCAE/RTCA Document ED-14F/DO-160F the following performance
has been demonstrated.

Condition Section Cat. Description

Temperature and Altitude 4.0 C4

Ground Survival Low

-55 deg C
Temperature

Short-Time Operating Low 4.5.1

-40 deg C
Temperature

Low Operating Temperature -40 deg C

C4
High Ground Survival
+85 deg C
Temperature

High Short-Time Operating 4.5.2

+70 deg C
Temp.

High Operating Temp. +55 deg C

In-flight Loss of Cooling 4.5.5 - No forced cooling required

Altitude 4.6.1 C4 35000 ft

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Condition Section Cat. Description

Decompression 4.6.2 N/A

Overpressure 4.6.3 N/A

Temperature Variation 5.0 B 5 deg C per minute

Humidity 6.0 A Standard

Fixed-wing and Helicopter,

Shock and Crash Safety 7.0 B
standard

Test curve M+G fixed-wing +

Vibration 8.0 S+U
helicopter

Explosion Proofness 9.0 - N/A

Water Proofness 10.0 Y N/A

Fluids Susceptibility 11.0 - N/A

Sand and Dust 12.0 - N/A

Fungus Resistance 13.0 - N/A

Salt Spray 14.0 - N/A

1 degree deflection at 0.3

Magnetic Effect 15.0 Z
m

DC installations with
Power Input 16.0 B battery of significant
capacity

High degree of protections

Voltage Spike 17.0 A
against voltage spikes

DC installations with
Audio Freq. Conducted
18.0 B battery of significant
Susceptibility
capacity

Primary power DC or AC, 400

Induced Signal Susceptibility 19.0 AC
Hz

Radio Frequency Interim High Intensity

20.0 SW
Susceptibility Radiated Fields

Equipment where
Emission of Radio Frequency interference should be
21.0 B
Energy controlled to a tolerable
level

Pin test waveform A, level

Lightning Induced Transients 3
22.0 A1E3X
Susceptibility Cable bundle test waveform
E, level 3

Lightning Direct Effects 23.0 - N/A

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Condition Section Cat. Description

Icing 24.0 - N/A

Equipment operated in an
Electrostatic Discharge 25.0 A
aerospace environment

Fire, Flammability 26.0 - N/A

1.10 Accessories

Available accessories for 620X can be purchased with the following

Article Numbers. The connector kit or mounting kit as required for
equipment installation is normally included in the delivery of your
purchased Transceiver. The following information is needed for spare
part order.

Connector Kit CK4201-S (soldering version) Article-No. 0879.304-954

1 Dsub25-s Article no. 0725.021-277

1 Connector housing Article no. 0775.479-277

1 Antenna plug Article no. 0725.706-277

1 Label “COMM” Article no. 0711.111-258

Connector Kit CK4201-C (crimp version) Article-No. 0514.901-954

1 Dsub25-s Article no. 0472.921-277

1 Connector housing Article no. 0775.479-277

1 Antenna plug Article no. 0725.706-277

1 Label “COMM” Article no. 0711.111-258

Connector Kit CK6200-S (soldering version) Article-No. 0617.903-954

1 Dsub25-s Article no. 0725.021-277

1 Dsub25-p Article no. 0726.331.277

2 Connector housings Article no. 0775.479-277

1 Antenna plug Article no. 0725.706-277

1 Label “COMM” Article no. 0711.111-258

Connector Kit CK6200-C (crimp version) Article-No. 0617.891-954

1 Dsub25-s Article no. 0472.921-277

1 Dsub25-p Article no. 0891.551-277

2 Connector housings Article no. 0775.479-277

1 Antenna plug Article no. 0725.706-277

1 Label “COMM” Article no. 0711.111-258

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Connector Kit CK5000-S (soldering version) Article-No. 0511.791-954

1 Dsub15-s Article no. 0344.801-277

1 Connector housing Article no. 0774.049-277

1 Label “COMM” Article no. 0711.111-258

1 Label “NAV” Article no. 0711.128-258

1 Label “ADF” Article no. 0711.136-258

1 Label “XPDR” Article no. 0711.144-258

Connector Kit CK5000-C (crimp version) Article-No. 0511.781-954

1 Dsub25-s Article no. 0774.030-277

1 Connector housing Article no. 0774.049-277

1 Label “COMM” Article no. 0711.111-258

1 Label “NAV” Article no. 0711.128-258

1 Label “ADF” Article no. 0711.136-258

1 Label “XPDR” Article no. 0711.144-258

Mounting Kit MK6201-(010) Article-No. 0631.515-261

Mounting Kit MK6403-1 Article-No. 0598.569-284

Adapter for AR3201 wiring 1AD042 Article-No. 0877.522-959

Available Documentation:

Operating Instructions AR6201, RT6201, RCU6201 Article no. 0638.420-071

Operating Instructions AR6203 Article no. 0639.680-071

Manual Installation and Operation 620X Family Article no. 0638.404-071

Manual Maintenance and Repair 620X Family Article no. 0638.412-071

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Section 2 INSTALLATION

The installation of the VHF transceiver depends on the type of aircraft and its
equipment. Therefore, only general information can be given in this section.

2.1 Limitations

The installation of the AR620X is designed for use in cockpit environment of

general aviation aircrafts including helicopters. For installation the
following limitations apply:

· Installations have to be in accordance with appropriate EASA or FAA

approved guidelines. The personnel installing this article must ensure
that the aircraft installation conditions are within the ETSO/TSO
standards applicable for the specific type or class of aircraft,

· The 620X VHF Transceiver must be connected to a VHF antenna in order to

satisfy FAA TSO-C169a.

· The conditions and tests for ETSO/TSO approval of this article are minimum
performance standards.

· The equipment is not intended for installation in areas where fluid

contamination could be commonly encountered.

Note: Changes or modifications made to this equipment not expressly approved

in written form by BECKER may void the authorization to operate this
equipment.

2.2 Unpacking the Equipment and Preparation for Installation

General

Visually inspect the package contents for signs of transport damage.

Carefully unpack the equipment and check for completeness. Retain all
packaging material in case reshipment becomes necessary.

Additional Required Equipment

The 620X VHF Transceiver is intended for use with standard aviation
accessories. The following equipment is required for installation:

· VHF COM Antenna with coaxial 50 Ω impedance cable and BNC connector

· Microphone and headphone or speaker

2.3 Mechanical Installation

2.3.1 AR6201 and RCU6201 Installation

The AR6201 and RCU6201 are designed to be mounted in the aircraft instrument
panel within easy view and reach of pilot/operator. The mounting location for
AR6201 shall be at least 30 cm away from the aircraft magnetic compass, to
avoid any interference to the magnetic compass by the transceiver. The
mounting location for RCU6201 has no restrictions. For unit dimensions refer

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to Figure 2-1, Figure 2-2 and Figure 2-3. Leave a clearance of minimum 5 mm
between the AR6201 respectively RCU6201 and other avionics to allow air
circulation. Forced cooling is usually not required. For installation via
back-panel mounting four screws are already attached to the unit front. The
circular cut out and the mounting holes have to be prepared in accordance
with Figure 2-4.

Figure 2-1: AR6201 side view, dimensions in mm and (inches)

Figure 2-2: RCU6201 side view, dimensions in mm and (inches)

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Figure 2-3: AR6201 and RCU6201 Figure 2-4: Drilling jig for back-panel mounting;
front view, dimensions in mm and dimensions in mm and (inches)
(inches)

2.3.2 AR6203 Installation

The AR6203 is designed to be mounted in the aircraft instrument panel within

easy view and reach of pilot/operator. The mounting location for AR6203 shall
be at least 30 cm away from the aircraft magnetic compass, to avoid any
interference to the magnetic compass by the transceiver. For unit dimensions
refer to Figure 2-5 and Figure 2-6. Leave a clearance of minimum 5 mm between
the AR6203 and other avionics to allow air circulation. Forced cooling is
usually not required.
For installation of the AR6203 use the designated mounting kit MK6403-1,
dimensions are shown in Figure 2-7.
First secure the mounting kit frame in the aircraft using 6 holes located on
both sides of the frame, marked with “C” letter on figure. Countersunk screws
are included in the delivery. Slide in the VHF transceiver into the mounting
up to the stop. Use a hex-wrench to tightening the AR6203 in the final
position.

Figure 2-5: AR6203 side view, dimensions in mm and (inches)

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Figure 2-6: AR6203 front view, dimensions in mm and (inches)

Figure 2-7: AR6203 mounting kit MK6403-1, dimensions in mm and (inches)

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2.3.3 RT6201 Installation

The RT6201 can be installed at a suitable place on the aircraft (for example
in avionics bay) or can be fixed using mounting kit MK6201-(010).

The mounting location for RT6201 shall be at least 30 cm away from the
aircraft magnetic compass, to avoid any interference to the magnetic compass
by the transceiver. For unit dimensions refer to Figure 2-8, Figure 2-9 and
Figure 2-10. Leave a clearance of minimum 5 mm between the RT6201 and other
avionics to allow air circulation. Forced cooling is usually not required.

Installation using RT6201 Mounting Holes

The required dimensions for installation using the mounting holes on the
RT6201 are given in Figure 2-9 (dedicated holes are marked with “M” letter).
Screws are included in the delivery.

Figure 2-8: RT6201 side view, dimensions in mm and (inches)

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Figure 2-9: RT6201 mounting holes, dimensions in mm and (inches)

Figure 2-10: RT6201 front view, Figure 2-11: MK6201-(010) mounting slot
dimensions in mm and (inches)

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Installation using Mounting Kit MK6201-(010)

The necessary dimensions for installation using the mounting kit MK6201-(010)
are given in Figure 2-12 (dedicated holes marked with “B” letter).

Figure 2-12: MK6201-(010) mounting slot fixing holes, dimensions in mm and (inches)

First secure the mounting kit frame in the aircraft, and then slide flat part
X Figure 2-9 of the RT6201 into the mounting slot S (Figure 2-11). Use two M3
screws to tighten the unit to the mounting slot (details A on Figure 2-13).
Suitable means are for example M3x6 DIN7985, associated flat washer 3.2
DIN433 and spring washer 3.1 DIN127B.

Figure 2-13: RT6201 top view, fixed on mounting slot.

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2.4 Electrical Interface

2.4.1 Connectors and Pin Assignment for AR6201, AR6203 and RT6201

Antenna Connector (Position 1)

The antenna connector (Figure 2-14, position 1) is a BNC type. The antenna
port is designed for operating with a nominal impedance of 50 Ohm.

Grounding Bolt (Position 2)

The transceiver has a M4 threaded grounding bolt (Figure 2-14,position 2)

allowing a low impedance grounding of the unit, which is essential to avoid
damage or malfunction in the case of indirect lightning, EMI and HIRF
conditions.

Figure 2-14: Male P1 and female J1 connectors

on back plate AR6201 and RT6201

Figure 2-15: Male P1 and female J1 connectors on back plate AR6203

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P1 Connector (System Interfaces) for AR6201, AR6203 and RT6201

The P1 connector (Figure 2-14 and Figure 2-15, Position 3) is a DSUB male
connector with 25 pins and slide-in fastener.

Pin No. Pin Name Direction Function

P1-1 SPK_HI OUT Speaker output signal (hot)

P1-2 HDPH1_A OUT Balanced output for headphone(s)1

P1-3 HDPH1_B OUT Balanced output for headphone(s)1

P1-4 AF_AUX_IN_HI IN Auxiliary audio input (hot)

P1-5 MIKE_DYN_HI IN Balanced input for dynamic microphone(s)

P1-6 MIKE_DYN_LO IN Balanced input for dynamic microphone(s)

P1-7 /IC IN Intercom key input;

ACTIVE state - closed contact to GND

P1-8 MIKE_STD_LO - Standard microphone(s) low

(ground/return) used for STD1, STD2 and
STD3

P1-9 MIKE_STD2_HI IN Standard microphone 2 High (hot)

P1-10 ILL_LO IN Illumination low input

P1-11 P_SUPP IN Power supply Hot (positive)

P1-12 P_SUPP IN Power supply Hot (positive)

P1-13 P_SUPP_GND - Power supply ground (return)

P1-14 SPK_LO - Speaker ground (return)

P1-15 LINE_OUT OUT Linear audio output, unbalanced

P1-16 AGC_OUT OUT Receiver AGC output

P1-17 /PTT1 IN Press To Talk key input1

ACTIVE state - closed contact to GND

P1-18 MIKE_STD1_HI IN Standard Microphone 1 High (hot)

P1-19 MIKE_STD3_HI IN Standard Microphone 3 High (hot)

P1-20 HDPH2_A OUT Balanced Output for headphone(s)2

P1-21 AF_AUX_IN_LO IN Auxiliary audio input low (ground/return)

P1-22 HDPH2_B OUT Balanced output for headphone(s)2

P1-23 ILL_HI IN Illumination high

P1-24 /PWR_EVAL OUT Power on monitor output

P1-25 P_SUPP_GND - Power supply ground (return)

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J1 Connector (Serial Interfaces and Discrete I/O’s)

The J1 connector is a D_SUB female connector with 25 sockets and slide-in

fastener.

Pin No. Pin Name Direction Function

J1-1 CPIN - Reserved coding pin

J1-2 TX2+ OUT Auxiliary control interface
J1-3 RX2+ IN Auxiliary Control Interface
J1-4 /SQL_EVAL OUT Squelch monitor output
ACTIVE state - closed contact to GND
J1-5 /PTT2 IN Press-To-Talk key input 2
ACTIVE state - closed contact to GND
J1-6 SHIELD_1 - Secondary control & service interface
SHIELD
J1-7 TX1+ OUT Secondary control & service interface
J1-8 RX1+ IN Secondary control & service interface
J1-9 TX2- OUT Auxiliary control interface
J1-10 RX2- IN Auxiliary control interface
J1-11 SHIELD_2 - Auxiliary control interface SHIELD
J1-12 /EXT_SO IN External ”Exchange” key
Falling edge will activate frequency
exchange
J1-13 /SRV_EN IN Service enable pin
ACTIVE state - closed contact to GND
J1-14 TX1- OUT Secondary control & service interface
J1-15 RX1- IN Secondary control & service interface
J1-16 NC not connected
J1-17 /SQL_SW IN “Squelch Force-OFF” input
ACTIVE state - closed contact to GND
J1-18 NC not connected
J1-19 NC not connected
J1-20 /ISOL IN “ISOL” input
ACTIVE state - closed contact to GND
J1-21 D_GND - Discrete lines ground
J1-22 D_GND - Discrete lines ground
J1-23 D_GND - Discrete lines ground
J1-24 /MIKE_SW IN Configuration selector CFG1 and CFG2
J1-25 /EXT_ON IN External Power ON input
ACTIVE state - closed contact to GND

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2.4.2 Inputs / Outputs Detailed Description

Microphone Connection – Standard Microphones

Pin No. Pin Name Direction Function

P1-8 MIKE_STD_LO - Standard microphone(s) low

(ground/return) used for STD1, STD2
and STD3

P1-9 MIKE_STD2_HI IN Standard microphone 2 high (hot)

P1-18 MIKE_STD1_HI IN Standard microphone 1 high (hot)

P1-19 MIKE_STD3_HI IN Standard microphone 3 high (hot)

The transceiver has three unbalanced inputs STD1, STD2 and STD3. Each input has
an input impedance of 110 Ohm and a nominal sensitivity of 110 mV.
This sensitivity level can be adjusted in the installation setup from 9 mV to
1500 mV independently for each of the microphones. The power supply delivered
from pins P1-9, P1-18 and P1-19 for supply of the connected microphone(s) is >
8 V DC (8.3 V nominal) open circuit with an output impedance of 120 Ohm.

Note:

1. Sensitivity range 25 mV to 1000 mV was qualified under environmental

conditions.

2. For common aviation microphones the power supply is able to support

two microphones in parallel. It is recommended to combine only
microphones of the same type / impedance.

3. For installations with high interferences it is recommended to use

sensitivity level 27 mV to 1500 mV.

4. It is highly recommended to mount the jacks isolated from aircraft

frame in order to avoid ground loops.

Microphone Connection - Dynamic Microphone

Pin No. Pin Name Direction Function

P1-5 MIKE_DYN_HI IN Balanced input for dynamic

microphone(s)

P1-6 MIKE_DYN_LO IN Balanced input for dynamic

microphone(s)

For interfacing with dynamic microphone(s) the transceiver has a balanced

input with an impedance of 140 Ohm and a nominal sensitivity of 1.6 mV. This
sensitivity level can is adjustable in the installation setup from 1 mV to 20
mV. Two dynamic microphones in parallel may be connected (identical technical
characteristics of the microphones are preferable).

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Note:

1. The sensitivity range of 1 mV to 20 mV was qualified under

environmental conditions. For installations with high interferences it
is recommended to use sensitivity level 2 mV to 20 mV.

2. Note: It is highly recommended to mount the jacks isolated from

aircraft frame in order to avoid ground loops.

Speaker Connection

Pin No. Pin Name Direction Function

P1-1 SPK_HI OUT Speaker output signal

P1-14 SPK_LO - Speaker ground (return)

The speaker output provides nominal 4 W into 4 Ohm.

CAUTION: The magnetic field of a speaker influences the magnetic compass.

When choosing the mounting point, a safe distance between the
compass and the speaker must be determined. After speaker
installation, the accuracy of compass operation must be verified.

Headphone(s) Connection

Pin No. Pin Name Direction Function

P1-2 HDPH1_A OUT Balanced output for headphone(s) 1

P1-3 HDPH1_B OUT Balanced output for headphone(s) 1

P1-20 HDPH2_A OUT Balanced output for headphone(s) 2

P1-22 HDPH2_B OUT Balanced output for headphone(s) 2

The headphone 1 output is a balanced, transformer-coupled output providing

nominal 300 mW into 75 Ohm. For the use of a single shielded wire for
headphone a unbalanced output configuration is recommended. To achieve this
P1-3 can be grounded (connection to pin P1-13/P1-25).

The headphone 2 output is balanced output providing nominal 200 mW into 75

Ohm.

Up to two headphones with self-impedance of 300 Ohm (or higher) may be

connected in parallel on each circuit, therefore up to four headphones can be
connected at the same time.

Note: It is highly recommended to mount the jacks isolated from aircraft

frame in order to avoid ground loops.

CAUTION: The headphone 2 output shall be always floating (cannot be connected

in unbalance configuration as headphone 1).

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Panel Illumination

Pin No. Pin Name Direction Function

P1-10 ILL_LO IN Illumination low input

P1-23 ILL_HI IN Illumination high input

The VHF transceiver provides illumination for push-buttons and LCD display.
In the installation setup it can be configured if this illumination is
controlled via front panel or externally via pins P1-10 and P1-23

Connect ILL_LO (pin P1-10) to aircraft ground. Connect ILL_HI (pin P1-23) to
dimming bus.

“Auxiliary” Audio Input

Pin No. Pin Name Direction Function

P1-4 AF_AUX_IN_HI IN Auxiliary audio input hot

Auxiliary audio input low

P1-21 AF_AUX_IN_LO -
ground/return

The AF auxiliary input enables to connect an external audio source (NAV,

music-player, …) to the transceiver. The external audio is audible only when
transceiver is in receiving mode.
The sensitivity can be adjusted in the installation setup from 50 mV to 8 V.
The input impedance of this input is 600 Ohm.

“LINE_OUT” Audio Output

Pin No. Pin Name Direction Function

P1-14 SPK_LO - Speaker ground (return)

P1-15 LINE_OUT_HI OUT Linear audio output, unbalanced

The LINE OUT enables to connect e.g. an external voice recorder to the
transceiver in ground-based installations. The LINE OUT output provides
nominal 1 VRMS into 1000 Ohm.

External Power ON

Pin No. Pin Name Direction Function

External Power ON input

J1-25 /EXT_ON IN ACTIVE state - closed contact to
GND

External Power ON input provides possibility to power on system by connecting

this pin to the ground. Can be connected in installation where avionics
central power switch is used.

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Push-To-Talk (/PTT)

Pin No. Pin Name Direction Function

Push-To-Talk key input 1

P1-17 /PTT1 IN ACTIVE state - closed contact to
GND
Push-To-Talk key input 2
J1-5 /PTT2 IN ACTIVE state - closed contact to
GND

There are two Push-to-Talk inputs /PTT1 and /PTT2.

Each input has an internal pull up. If input is connected to ground a current
of less than 1 mA will flow. The transceiver enters transmit operation, if
one or both inputs are connected to ground.
According to microphone(s) configuration, signal from particular inputs can
or cannot modulate transmissions.

External Intercom Key (IC)

Pin No. Pin Name Direction Function

Intercom key input;

P1-7 IC IN ACTIVE state - closed contact to
GND
With pin 7 connected to ground the transceiver provides intercom operation.
This input has an internal pull up and is LO active at max.1 mA. For
installations where automatic intercom operation is activated via VOX
connection of this pin 7 is not necessary. If input is connected to ground a
current of 1 mA will flow.
This discrete input activates the intercom:

· When the VOX does not work satisfactorily because of very loud cockpit
environment and too high ambient noise

· When the speaker is enabled in current audio in/out configuration

(installation setup)

Isolation Mode (/ISOL)

Pin No. Pin Name Direction Function

ISOL input for separation from co-

J1-20 /ISOL IN pilot (passenger)
ACTIVE state - closed contact to
GND
620X transceiver provides two microphone paths. Two microphones can be
physically connected to each microphone path. Depending on the configuration
it is possible to connect pilot and copilot on one path and two passengers on
second path.

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When /ISOL is active (isolation mode) passengers are isolated from pilots
intercom and from radio transmission, but still can freely communicate with
each other.

When /ISOL is inactive both the pilots and the passengers can hear all
communications.

Power Indication (/PWR_EVAL)

Pin No. Pin Name Direction Function

Power on Monitor output:

P1-24 /PWR_EVAL OUT AR6201 “OFF” - open circuit AR6201 on
- closed circuit to GND (max. 100 mA)

This output indicates if the transceiver is switched on or switched off. It

is an open collector output type. The output is internally connected to
ground when the unit is switched on. In this case a current of maximum 100 mA
can flow into the transceiver to drive for example an external relay. The
output has high impedance when the unit is switched off.

Note: In order to avoid damage of this output a protection diode in parallel

to the external relay shall connected.

VHF Channel Signal Indication (/SQL_EVAL)

Pin No. Pin Name Direction Function

Indicates presence of the VHF

J1-4 /SQL_EVAL OUT channel’s signal on the audio
outputs.

This output indicates presence of the VHF channel’s signal on the audio
outputs. It is an open collector output type. The output is internally
connected to ground when the unit receives signal on the selected VHF channel
and this audio signal is available on audio outputs. In this case a current
of maximum 100 mA can flow into the transceiver to drive an external relay
for example. The output has high impedance when the unit is switched off.

External Mike Switch (/MIKE_SW)

Pin No. Pin Name Direction Function

J1-24 /MIKE_SW IN Configuration selector CFG1 and CFG2.

ACTIVE state - closed contact to GND

The external Mike switch provides selection between the two available audio
in/out configurations: CFG1 and CFG2. Configurations can also be switched
during flight in installation setup.

· When /MIKE_SW is active then configuration CFG1 is used.

· When /MIKE_SW is inactive then CFG2 is used.

Each configuration CFG1 and CFG2 stores several parameters, that can be set
in installation setup pages. (For details refer to chapter 2.7).

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2.4.3 Connector and Pin Assignment for RCU6201

Figure 2-16: Connector on back plate of RCU6201

P1 Connector (System Interface) for RCU6201

The P1 connector (Figure 2-16) is a DSUB male connector with 15 pins and
slide-in fastener.

Pin No. Pin Name Direction Function

P1-1 TX0_422+ OUT Primary Control & Service Interface
P1-2 TX0_422- OUT Primary Control & Service Interface
P1-3 RX1_422+ IN Auxiliary Control Interface
P1-4 RX0_422+ IN Primary Control & Service Interface
P1-5 RX0_422- IN Primary Control & Service Interface
P1-6 ILL_LO IN Illumination low input
P1-7 TX1_422- OUT Auxiliary Control Interface
P1-8 ILL_HI IN Illumination high
Power supply Ground (return),
P1-9 GND - shielding for RS422, Ground for
discrete lines
P1-10 RX1_422- IN Auxiliary Control Interface
P1-11 SUPP_IN - Power supply Hot (positive)
Service enable pin
P1-12 /SRV_EN OUT
ACTIVE state - closed contact to GND
External Power ON input
P1-13 /EXT_ON IN
ACTIVE state - closed contact to GND
P1-14 TX1_422+ OUT Auxiliary Control Interface
External “Exchange” key
P1-15 /EXCH_CH IN
ACTIVE state - closed contact to GND

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Panel Illumination

Directio
Pin No. Pin Name Function
n

P1-6 ILL_LO IN Illumination low input

P1-8 ILL_HI IN Illumination high input

The RCU6201 controller push-buttons and LCD display can be illuminated. The
illumination can be configured in the installation setup via front panel or
externally via pin P1-6/P1-8 For external configuration connect pin P1-6 to
system ground and pin P1-8 to dimming voltage bus.

External Power ON (/EXT_ON)

Directio
Pin No. Pin Name Function
n

External Power ON input/output

P1-13 /EXT_ON IN/OUT
ACTIVE state - closed contact to GND

The External Power “ON” input provides the possibility to power on the system
by ensuring this pin is earthed. This can be connected in installations with
a central avionics power switch or to power on RT6201.

External Exchange (/EXCH_CH)

Directio
Pin No. Pin Name Function
n

External “Exchange” key

P1-15 /EXCH_CH IN
ACTIVE state - closed contact to GND

The External “Exchange” input provides possibility to change active and

preset frequency or activate SCAN mode by means of momentary switch.

2.5 Installation and Configuration of 620X Transceivers

Connection to the following equipment is required as minimum for 620X VHF
transceivers:
· Power supply
· Antenna
· Microphone (direct or via external audio panel)
· Headphone or speaker (direct or via external audio panel)
· Push-To-Talk (PTT) switch
Note:

1. Use only cables which are qualified for aircraft use (self-
extinguishing).
2. Use AWG 20 for power supply and AWG 22/24 for other cables.
3. Fit sleeves over the solder joints on the equipment connector.
Crimp connectors are also available from BECKER.
4. Protect the power supply with a 7.5 A fuse.

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The VHF transceiver is protected internally by a 5 A resettable fuse.

· Type-specific cable harnesses are also available for the aircraft wiring
(contact BECKER for detailed information).

· No RF antenna cables or HF cables should be included in the cable

harnesses of the system. Avoid routing of the cable loom along with other
wiring, which carry audio power or pulses.

· Check the wiring carefully before powering up the unit and check
particularly that power supply lines have not been reversed.

Installation of 620X transceivers requires correct wiring and configuration.

All necessary information for common installations including wiring diagrams
and recommended installation setup configurations are provided in 2.9.

Aircraft Type Chapter Reference

Single seat glider 2.9.1

Twin seat motor glider 2.9.2

General aviation (GA) aircraft using standard 2.9.3

microphones

Individual dual headset configuration 2.9.4

(two IC circuits)
Twin seat with AR6201 tandem configuration 2.9.5

Aircraft with four seats (no TANDEM) 2.9.6

Installation with RT6201 2.9.7

Aircraft with intercom 2.9.8

Twin seat with RT6201 tandem configuration 2.9.9

2.6 Antenna Installation

The transceiver requires a standard 50 Ohm vertically polarized VHF antenna.

Follow the antenna manufacturer's installation instructions. In addition
consider the following recommendations:
· The COM antenna shall be on an electrical conductive surface or, on a
ground plane with sufficient area of approximately 60 x 60 cm installed.
(VSWR ≤ 3:1)
· The COM antenna should be separated from any installed GPS antennas by at
least 50cm and as far as possible separated from any ELT antenna
installed.
Note: Some ELTs have exhibited re-radiation problems generating harmonics
that may cause interference with other receivers like GPS. This can
happen when the transceiver or other COMM devices are transmitting on
certain frequencies such as 121.5 MHz or 121.175 MHz, which may cause
the ELT output circuit to auto-oscillate.

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2.7 Installation Setup for RT/AR6201-(X1X)

The installation setup enables the avionics technician to set up the equipment
configuration on ground. In-flight changes are not recommended.
In most cases installation setup is started on primary controller to access
controller and transceiver parameters. If installed the second controller
RCU6201 should be switched off. Installation setup on RCU6201 gives access to
parameters of second controller. RCU6201 installation setup shall be used only
if different settings for “BRIGHTENSS” or “ILLUMINATION CURVE” are required.
Note:
1. For single block AR620X, primary controller is this one directly
connected to VHF transceiver, for remote RT6201 VHF transceiver
primary controller is this one connected to primary control interface.

2. After power on the second controller (RCU6201) parameters are

synchronized with those stored in primary controller. Any RCU6201
stored parameters will be overwritten!

2.7.1 Entering Installation Setup

Hold down the “MDE” key during power up to access the installation setup menu.
The “PASSWORD DIALOG” screen will appear.

Figure 2-17: “PASSWORD DIALOG” Figure 2-18: “DECIVE INFO”

Insert the 4-digit numerical code password “6435” by turning and pushing the
“ROTARY ENCODER”. Confirm by pressing the ”STO” key. Now the first page of
installation setup shows the “DEVICE INFO” screen.

2.7.2 Leaving Installation Setup

The installation setup can be left just by switching off the AR620X or RCU6201.
All changes done up to that time are stored automatically.
2.7.3 Page Up / Page Down in the Installation Setup
The installation setup consists of several pages. Navigation within main pages:
Page Down (next page): pressing “↕/SCN” or the “ROTARY ENCODER”.
Page Up (previous page): pressing “IC/SQL” key.
Within the sub-pages of the installation setup use the “ROTARY ENCODER” for
navigation.
2.7.4 Storage of Setup Data
The setting of any parameter is stored immediately after changing the
parameter.

2.7.5 Terminate Installation Setup

Switch “OFF” the AR620X or RCU6201 to terminate the setup. All changes made up
to this time will be stored automatically. No special action is required before
leaving setup page.

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2.7.6 VU Meter

The VU Meter allows correct adjustment of audio input sensitivity.

Display Contents Description

VU Meter is displayed on all sensitivity setting

menus, it is located in the middle below the
menu name and above the dedicated sensitivity
setting bar

It displays the current audio level value on

selected audio input (“Current audio level”) and
holds the highest value of active audio level
recorded during last 3 seconds (displayed as
“Hold max level” bar).

Correct sensitivity is achieved if most of the

time, while you are speaking normally into the
microphone, the “Hold max level” bar remains in
the “Recommended range”.

2.7.7 Installation Setup Pages - Data Description

Display Contents Description

AR620X “DEVICE INFO”: After entering the “Installation Setup” the first
page “DEVICE INFO” is displayed. This page shows
information about the SW version and the serial
number of the transceiver.

For AR620X “DEVICE INFO” displays information

about;
RCU6201 as primary
controller of RT6201 · Transceiver SW version (CM SW VER)
“DEVICE INFO”:
· Controller SW version (CH SW VER),

· AR620X serial number (AR SN).

For RCU6201 connected as primary controller of an

RT6201, this page displays information about;

RCU6201 as secondary · Controller SW versions (CH SW VER)

controller “DEVICE INFO”:
· Transceiver SW version,

· RCU6201 serial number (CH SN)

· RT6201 serial number (CM SN).

For RCU6201 connected as secondary controller this

page displays information about;

· Controller SW version (CH SW VER)

· RCU6201 serial number (CH SN).

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Display Contents Description

DIMMING INPUT One of three options can be selected by turning the

NONE “ROTARY ENCODER” to dim display illumination and
0-14V
0-28V
push-button background lighting. Finalize the
selection by pressing “STO” push-button.

NONE:

The illumination for LCD and push-buttons is

controlled via the “ROTARY ENCODER” on the
transceiver itself. The pilot can adjust the
brightness in the pilots menu.

0…14V or 0…28V:

The background lighting for LCD and push-buttons is

controlled (via pin P1-10/P1-23) by the dimming bus
of the aircraft. The dimming curve is adjustable
within the range from 0 … 14 V DC respectively 0 …
28 V DC. Adjusting the brightness via the “ROTARY
ENCODER” is no longer possible after selecting this
option.

Note: Menu available on primary and secondary

controller

BRIGHTNESS The brightness of the LCD and push-button

illumination can be adjusted between 0% (off) and
25 % 100%. Select your brightness by turning “ROTARY
ENCODER”. The BRIGHTNESS settings can also be
adjusted in the pilot setup menu. Pilots can
change the parameter at any time.

BRIGHTNESS settings are separate for each

controller therefore this menu is available on
both controllers.

Note: This page is displayed only if dimming

input is set to “NONE”. Otherwise the
aircraft dimming bus will control the
brightness

ILLUM CURVE The page “ILLUM CURVE” is displayed only if the

I
L DIMMING input is either selected for “14V or 28V”
L
U dim-bus voltage. The illumination curve shows the
M
14V
relation between dimming bus voltage and
brightness of the LCD and push-button
ILLUM CURVE
I illumination. Two adjustable points V1 and V2
L
L define the illumination curve. Select the
U
M respective parameter by pushing the “STO” button
and then adjust the value in horizontal
(left/right) respectively vertical up/down)

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Display Contents Description

ILLUM CURVE direction using the “ROTARY ENCODER”.

I
L
L (1) This parameter defines the horizontal
U
M
parameter V1x (minimum values: 1.5V for 14V
dimming bus and 4V for 28V dimming bus). Up to
ILLUM CURVE this value the brightness is zero. When reaching
I
L V1x the brightness is immediately adjusted to V1y.
L
U
M (2) This parameter defines the vertical parameter

V1y which is the level of brightness that is set

ILLUM CURVE when trigger point V1x is reached.
I
L
L (3) This parameter defines the horizontal
U
M
parameter V2x (maximum values: 14 or 28 V
depending on selected dimming input) where the
illumination curve reaches the maximum brightness
level.

(4) This parameter defines the vertical parameter

V2y which is the maximum brightness.

Note: Menu available on primary and secondary

controller

MEMORY OPTIONS Two options can be selected on “MEMORY OPTIONS”

CHANNEL STORE page. By means of the “ROTARY ENCODER” one option
STORE LAST CHANNEL
can be highlighted and enabled/ disabled by
pushing the “STO” button.

CHANNEL STORE:

If this option is enabled frequencies can be

stored in any of the 99 available channels.

Even if the “CHANNEL STORE” option is disabled the

user has access to previously stored “User
Channels”

STORE LAST CHANNEL

If this option is enabled, the device

automatically stores the last used VHF frequency
in “Last Channel” database and user has a read
access to this database.

If this option is disabled the stored data in the

“LAST CHANNEL” database is not accessible.

Note: Menu available on primary and secondary

controller

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Display Contents Description

MDE PAGES On “MDE PAGES” page three options are selectable

STANDBY FREQUENCY by means of the “ROTARY ENCODER”. The three
BATTERY VOLTAGE
CHANNEL MEMORY frequency selection modes provide different user
interfaces for operating frequency selection.
Enabling/Disabling can be toggled by pushing the
“STO” button.

STANDBY FREQUENCY enables/disables “Standard Mode”

BATTERY VOLTAGE enables/disables “Direct Tune

Mode”.

CHANNEL MEMORY enables/disables “Channel Mode”.

After deselecting “BATTERY VOLTAGE” the “DIRECT

TUNE MODE” page is no longer available in the
normal operation.

Storing a frequency in a specific channel will be

possible even if only “BATTERY VOLTAGE” or
“STANDBY FREQUENCY” remain selected.

At least one page will remain active, deselecting

all options from the “MDE PAGES” is not possible

Note: Menu available on AR620X and RCU6201

On “LOW BATT THR” page the threshold for

indication of the “LOW BATT” warning page can be
adjusted (default setting is 10.5 V). The low
battery threshold depends on battery type in use
and should be adjusted within 10V…33V by the
installer turning the “ROTARY ENCODER”. “LOW BATT”
warning page is displayed if the supply voltage
drops below the “LOW BATT THR” value.

Recommended vales:

“LOW BATT THR” = 11V for 12V battery

“LOW BATT THR” = 24V for 24V battery

Note: Menu available on primary and secondary

controller

On “CONFIGURATION” page 6 or 7 options can be

selected. (refer to the note under AUX AUTO MUTE in
the column on the right side) Use the “ROTARY
ENCODER” to scroll up and down, then and push the
“STO” button for selection.

TANDEM - if selected, a second controller RCU6201

can be connected to AR620X/RT6201.
Options 1 to 4
AUX INPUT - if selected, the auxiliary audio signal

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Display Contents Description

applied to pins P1-4 / pin P1-21 is audible on

headphone / speaker.
Note: If the auxiliary audio input is not used
it is recommended to deselect “AUX
INPUT”.

AUX AUTO MUTE – if selected the auxiliary audio

Options 4 to 7 input will be muted. The auxiliary audio input is
also muted if the receiver detects (based on
squelch evaluation) a signal.

When deselected the auxiliary audio input signal

and the receiver signal will intermix continuously.

Note: “AUX AUTO MUTE” is only displayed when

“AUX INPUT” is enabled.

AUTO ISOL IN TX – if selected a separation between

the pilots and passenger intercom circuits is
provided while one of the pilots transmits.

SCAN BEEP - if selected the transceiver generates

(only in scan function) a short beep tone to notify
a signal presence on the “PRESET FREQUENCY”.

During signal reception on the “ACTIVE FREQUENCY”

switch over to the “PRESET FREQUENCY” is not
possible. The audio remains on “ACTIVE FREQUENCY”
and a short beep tone is audible. Additionally the
“PRESET FREQUENCY” will appear contrast inverted in
a sequence of approximately one second.

FREQ CHANGE BEEP - if selected the transceiver

generates a short beep on each change of the
“ACTIVE FREQUENCY”.

SWAP MIKE IC - if selected the /IC input functions

as /MIKE_SW input and /MIKE_SW input operates as
/IC input.

AUX IN SENS On “AUX IN SENS” page the sensitivity adjustment

VU of the auxiliary audio input (Pin P1-4 / Pin P1-
20 dB 800 mV 21), in the range 50mV to 8000mV, can be set by
turning the “ROTARY ENCODER”.

This page is displayed only if ENABLE_AUX_IN is

activated.

The VU meter shows the current signal level of the

aux audio input and always displays the highest
detected signal value from the last 3 seconds.

Note: Menu available on primary controller

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Display Contents Description

AUTO AUX ATT On “AUTO AUX ATT” page the attenuation for the
auxiliary audio input can be adjusted between 0 to
20
40 dB by turning the “ROTARY ENCODER”

When intercommunication is initiated (regardless

of the intercom activation: “VOX”, or “/IC”
discrete input) the signal from auxiliary audio
input will be attenuated. After intercommunication
is finished the auxiliary audio will revert to its
previous level.

Note: Menu available on primary controller

IN/OUT CFG 1 On “IN/OUT CFG 1” page the microphone inputs and

MICROPHONE 1
STD 1 MIKE headphone outputs for configuration CFG1 can be
STD 2 MIKE
STD 3 MIKE configured. To scroll the page turn the “ROTARY
DYN MIKE
NONE ENCODER”.
MICROPHONE 2
STD 1 MIKE
STD 2 MIKE
STD 3 MIKE
DYN MIKE “MICROPHONE 1” (at one time only one option can be
NONE
MIC ACTIVATION selected):
BOTH MIKES
OUTPUTS STD1 MIKE - standard microphone input 1
HDPH 1
HDPH 2 (Pins P1-18/ P1-8) is selected
SPEAKER
NONE
STD2 MIKE - standard microphone input 2
(Pins P1-9/ P1-8) is selected

STD3 MIKE - standard microphone input 3

(Pins P1-19/ P1-8) is selected

DYN MIKE - dynamic microphone input

(Pins P1-6/ P1-5) is selected

NONE - No microphones is used in microphone path 1

“MICROPHONE 2” (at one time only one option can be

selected):

STD1 MIKE - standard microphone input 1

(Pins P1-18/ P1-8) is selected

STD2 MIKE - standard microphone input 2

(Pins P1-9/ P1-8) is selected

STD3 MIKE - standard microphone input 3

(Pins P1-19/ P1-8) is selected

DYN MIKE - dynamic microphone input

(Pins P1-6/ P1-5) is selected

NONE - No microphones is used in microphone path 2

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Display Contents Description

“MIC ACTIVATION”

BOTH MIKES ENABLED:

· input /PTT1 (Pin P1-17) activates

transmission from microphone path 1 and 2

· input /PTT2 (Pin J1-5) activates

transmission from microphone path 2 and
path 1

· input /IC (Pin P1-7) activates intercom from

microphone path 1 and 2

BOTH MIKES DISABLED:

· input /PTT1 (Pin P1-17) activates

transmission only from microphone path 1

· input /PTT2 (Pin J1-5) activates

transmission only from microphone path 2

· input /IC (Pin P1-7) activates intercom only

from microphone path 1

“OUTPUTS”

HDPH 1 ENABLED - audio available on headphone 1

output (Pins P1-2/P1-3)

HDPH 1 DISABLED - no audio available on headphone

1 output.

HDPH 2 ENABLED - audio is available on headphone 2

output (Pins P1-20/P1-22), speaker not available.

HDPH 2 DISABLED – no audio available on headphone

2 output, speaker not available.

SPEAKER ENABLED - audio is available on speaker

(Pins P1-1/P1-14), headphone 2 not available

NONE - no audio on headphone 2 output or speaker

output.

Note:

1 Menu available on primary controller.

2 Displayed only if MIKE_SW input (Pin J1-24)

has Inactive state.

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Display Contents Description

IN/OUT CFG 2 On “IN/OUT CFG 2” page the microphone inputs and

MICROPHONE 1
STD 1 MIKE headphone outputs for configuration CFG2 can be
STD 2 MIKE
STD 3 MIKE configured. This page is displayed only if MIKE_SW
DYN MIKE
NONE input (Pin J1-24) has active state. Please
MICROPHONE 2 remember when MIKE_SW connected in installation
STD 1 MIKE
STD 2 MIKE
both configurations for IN/OUT CFG1 and IN/OUT
STD 3 MIKE CFG2 shall be configured To scroll the page turn
DYN MIKE
NONE the “ROTARY ENCODER”.
MIC ACTIVATION
BOTH MIKES
OUTPUTS
HDPH 1
HDPH 2
SPEAKER
NONE

“MICROPHONE 1” (at one time only one option can be

selected):

STD1 MIKE - standard microphone input 1

(Pins P1-18/ P1-8) is selected

STD2 MIKE - standard microphone input 2

(Pins P1-9/ P1-8) is selected

STD3 MIKE - standard microphone input 3

(Pins P1-19/ P1-8) is selected

DYN MIKE - dynamic microphone input

(Pins P1-6/ P1-5) is selected

NONE - No microphones is used in microphone path 1

“MICROPHONE 2” (at one time only one option can be

selected):

STD1 MIKE - standard microphone input 1

(Pins P1-18/ P1-8) is selected

STD2 MIKE - standard microphone input 2

(Pins P1-9/ P1-8) is selected

STD3 MIKE - standard microphone input 3

(Pins P1-19/ P1-8) is selected

DYN MIKE - dynamic microphone input

(Pins P1-6/ P1-5) is selected

NONE - No microphones is used in microphone path 2

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Display Contents Description

“MIC ACTIVATION”

BOTH MIKES ENABLED:

· input /PTT1 (Pin P1-17) activates

transmission from microphone path 1 and 2

· input /PTT2 (Pin J1-5) activates

transmission from microphone path 2 and 1

· input /IC (Pin P1-7) activates intercom from

microphone path 1 and 2

BOTH MIKES DISABLED:

· input /PTT1 (Pin P1-17) activates

transmission only from microphone path 1

· input /PTT2 (Pin J1-5) activates

transmission only from microphone path 2

· input /IC (Pin P1-7) activates intercom only

from microphone path 1

“OUTPUTS”

HDPH 1 ENABLED - audio available on headphone 1

output (Pins P1-2/P1-3)

HDPH 1 DISABLED - no audio is available on

headphone 1 output.

HDPH 2 ENABLED - audio is available on headphone 2

output (Pins P1-20/P1-22), speaker not available.

HDPH 2 DISABLED – no audio available on headphone

2 output, speaker not available.

SPEAKER ENABLED - audio is available on speaker

(Pins P1-1/P1-14), headphone 2 not available

NONE - no audio on headphone 2 output or speaker

output.

Note:

1 Menu available on primary controller.

2 Displayed only if MIKE_SW input (Pin J1-24)

has Inactive state.

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Display Contents Description

STD 1 MIKE SENS The sensitivity of standard microphone 1, “STD 1

VU MIKE SENS”, input is adjustable within the range 9
20 dB 150 mV mV to 1500 mV by turning the “ROTARY ENCODER”.

The factory setting is 110 mV.

Note: This page is only The VU meter displays the current signal level on
displayed if :
the audio input and also displays the highest
Standard Mike 2 input is signal value for the last 3 seconds.
selected in IN/OUT CFG1
and MIKE_SW input pin When speaking normally into the microphone the bar
status is [Inactive] graph should remain within the recommended
or Standard Mike 2 input predefined range
is selected in IN/OUT
CFG2 and MIKE_SW input pin Note: Adjust the microphone sensitivity by keeping
status is [Active] the cockpit noise suppression as high as possible,
this will ensure correct modulation.

If the sensitivity is adjusted to a smaller value

(e.g. 10 mV) the cockpit noises may become louder
than for a higher adjustment (e.g. 100 mV).

Otherwise, adjusting the sensitivity to a very

high value (e.g. 1000 mV), the cockpit noise is
very much reduced, but the modulation of the
transmitter might be not sufficient.

The installer shall perform a communication check

after modification of this parameter. Recommended
is to perform this check with and without a
running engine. Note 2: Menu available on primary
controller.
Note: For installations with high interferences it
is recommended to use sensitivity level 27 mV to
1500 mV.

STD 2 MIKE SENS The sensitivity of Standard Microphone 2 Input can

VU be adjusted in range from 9 mV to 1500 mV by
20 dB 150 mV turning the rotary knob.

The default setting is 110 mV.

Note: This page is only VU meter displays current value of Audio Level
displayed if :
from standard microphone input 2 and displays the
Standard Mike 2 input is highest value of Active Audio Level recorded
selected in IN/OUT CFG1
during last 3 seconds.
and MIKE_SW input pin
status is [Inactive] Correct sensitivity is achieved when you are
or Standard Mike 2 input speaking normally into the microphone, this is
is selected in IN/OUT confirmed by the “Hold max level bar” remaining in
CFG2 and MIKE_SW input pin “Recommended range”.
status is [Active]

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Display Contents Description

Note 1: The microphone sensitivity shall be

adjusted to achieve a correct modulation by
keeping the cockpit noise suppression as high as
possible.

If the sensitivity value is very small (e.g. 10

mV) more cockpit noise will be heard than if the
sensitivity value is set to a higher level (e.g.
100 mV).

Alternatively if the sensitivity value is very

high (e.g. 1000 mV) the cockpit noise will
significantly be reduced but the modulation of the
transmitter may not be sufficient.

After modifying this parameter a communication

check shall be done by the installer. It is
recommended to perform this communication check
with and without engine running.

Note 2: Menu available on primary controller.

Note 3: For installations with high interference

it is recommended to use sensitivity level 27 mV
to 1500 mV

STD 3 MIKE SENS The sensitivity of Standard Microphone 3 Input can

VU be adjusted in range from 9 mV to 1500 mV by
20 dB 150 mV turning the rotary knob.
The default setting is 110 mV.
Note:
VU meter displays current value of Audio Level
This page is only from Standard microphone input 3 and displays the
displayed if : highest value of Active Audio Level recorded
Standard Mike 3 input is
during last 3 seconds.
selected in IN/OUT CFG1
and MIKE_SW input pin
Correct sensitivity is achieved when you are
status is [Inactive] speaking normally into the microphone, this is
or Standard Mike 3 input confirmed by the “Hold max level bar” remaining in
is selected in IN/OUT
“Recommended range”.
CFG2 and MIKE_SW input pin
status is [Active]
Note 1: The microphone sensitivity shall be
adjusted to achieve a correct modulation by
keeping the cockpit noise suppression as high as
possible.

If the sensitivity value is very small (e.g. 10

mV) more cockpit noise will be heard than if the
sensitivity value is set to a higher level (e.g.
100 mV).
Alternatively if the sensitivity value is very
high (e.g. 1000 mV) the cockpit noise will
significantly be reduced but the modulation of the
transmitter may not be sufficient.

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Display Contents Description

After modifying this parameter a communication

check shall be done by the installer. It is
recommended to perform this communication check
with and without engine running.

Note 2: Menu available on primary controller.

Note 3: For installations with high interferences
it is recommended to use sensitivity level 27mV to
1500 mV.
DYN MIKE SENS The sensitivity of the Dynamic Mike, “DYN MIKE
VU SENS”, input is adjustable within a range of 0,5
20 dB 2.5 mV mV to 25 mV by turning the “ROTARY ENCODER”.

The factory setting is 3.5 mV.

Note: This page is only When speaking normally into the microphone the bar
displayed if :
graph should remain within the recommended
Dynamic input is selected predefined range
in IN/OUT CFG1 and
MIKE_SW input pin status Note: The microphone sensitivity shall be adjusted
is [Inactive] to achieve a correct modulation by keeping the
or Dynamic Mike input is cockpit noise suppression as high as possible.
selected in IN/OUT CFG2
and MIKE_SW input pin If the sensitivity is adjusted to a smaller value
status is [Active] (e.g. 1 mV) the cockpit noises may become louder
than for a higher adjustment (e.g. 25 mV).

Otherwise, adjusting the sensitivity to a very

high value (e.g. 25 mV), the cockpit noise is
significantly reduced but the modulation of the
transmitter may not be sufficient.

The installer shall perform a communication check

after modification of this parameter. Recommended
is to perform this check with and without a
running engine. Note 2: Menu available on primary
controller.

Note: For installations with high interferences it

is recommended to use sensitivity level 2 mV to 25
mV

SPKR VOLUME SOURCE One of the three following options may be selected
PRIMARY CH for speaker volume source, “SPKR VOL SRC”, by
SECONDARY CH
BOTH
pressing the “STO” button:

PRIMARY CH

If “PRIMARY CH” is selected the speaker volume

will be adjustable by AR6201-(X0X).

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Display Contents Description

SECONDARY CH

If “SECONDARY CH” is selected the speaker volume

will be adjustable by RCU6201.

BOTH

If “BOTH” is selected the speaker volume will be

adjustable by the arithmetic average value from
AR6201-(X0X) and RCU6201.

Note 1: The “SPKR VOLUME SOURCE” shall be set to

“PRIMARY CH” if the optional second controller
RCU6201 is not available. Note: If optional second
controller RCU6201 is not available then SPKR
VOLUME SOURCE shall be set to the PRIMARY CH

Note 2: Menu available on primary controller only

The noise squelch threshold “SQUELCH THR” is

SQUELCH THR
adjustable within a range of 6 to 26 by turning
8 the “ROTARY ENCODER”.
Minimum Adjustment of 6 means:
Weak RF signals can trigger the Squelch threshold
and the voice signal might be low combined with a
noisy background.

Maximum adjustment of 26 means:

Only strong RF signals will trigger the Squelch

threshold. The voice signal will be audible very
clear with very low background noise.
Weak RF signals may not trigger the Squelch
threshold and therefore the audio may not be heard
by the pilots.
Note: Adjustment of the “SQUELCH THR” is available
via the “PILOTS MENU” at any time.

Note: Menu available on primary controller only

The “SCAN HOLD_TIME” is adjustable within the

range of 1 to 60 seconds by turning the “ROTARY
ENCODER”.

Note:

1. For normal airborne operation it is recommended

to leave the setting at 1.
2. The default factory setting is 1.
3. The Menu is available only on the primary
controller
Note: Menu available on primary controller only

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Display Contents Description

SIDETON ATT The sidetone attenuation “SIDETONE ATT” is

adjustable within the range 0…12 dB by turning the
6
“ROTARY ENCODER”.

The attenuation relates to the intercom volume.

0dB = sidetone as loud as intercom signal.

12dB = sidetone signal 12dB less than the

intercom signal.

Example; If the intercom volume is set to a very

low value, then the sidetone volume will be reduced
in relation to the intercom volume, irrespective of
the sidetone value.

The “SIDETONE ATT” parameter is an additional

attenuation of the sidetone signal in transmit
mode.

Note: Menu available on primary controller only.

ERASE CHN MEM The 620X Transceiver provide two databases to store
NO up to 99 VHF frequencies identified by channel
YES numbers (CH01 to CH99).

Both data bases, the “User Channels Database” and

“Last Channels Database” can be erased.

To erase the data bases;

1. Select “YES” via the “ROTARY ENCODER”

2. Press the “STO” push-button to confirm the

selection.

Note: Menu available on primary controller only

ERASE FREQ LAB The AR6201-(XXX) provides a third database,

NO “FRQUENCY LABELS DATABASE”, containing 99 text
YES labels of max 10 characters each. A text label can
be assigned to any of the channels (CH01 to CH99),
the Labels are stored manually.

The “LABELS DATABASE” can be erased.

To Erase the data base;

1. Select “YES” via the “ROTARY ENCODER”

2. Press the “STO” push-button to confirm the

selection.

Note: Menu available on primary controller only

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Display Contents Description

FAIL LIST This page automatically stores and displays

P_NVRAM TEST 0 information from all failures that occur during
P_INTERNAL IC 0
operation of the AR6201(X0X).
P_RXS LOCK 0
P_RECEIVER 0
Used for trouble shooting and failure isolation.

Note:

1. The display can only show 4 (AR6201) monitored

failures types (more are available).

2. Move the slide bar via the “ROTARY ENCODER” To

view any additional failures.

3. “0” means no failure were detected and stored.

4. “1” means that a failure was detected once or

several times and stored.

5. Menu available on primary controller only

ERASE FAIL LIST To erase all stored failures.

NO 1. Selecting “YES” via the “ROTARY ENCODER”.
YES
2. Press the “STO” push-button to confirm.

Erasing the failure list should not be undertaken

by the installer. The failure list will normally
be deleted by factory or maintenance shop after a
repair is completed

Note: Menu available on primary controller only

The factory default settings are the settings of

the AR6201-(X0X) when it left the factory after
production.

To restore the factory settings;

1. Select “YES” via the “ROTARY ENCODER”.

2. PRESS the “STO” push-button to confirm.

Note:

Restoring the factory default settings will

overwrite all previous and customized
installation settings!

Menu available on primary controller only.

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2.8 Factory Default Settings

R Enabled £ Disabled ˜ Selected ™ De-Selected

Setting name Value

DEVICE INFO
DIMMING INPUT NONE
BRIGHTNESS 50%
MEMORY OPTIONS R CHANNEL STORE
R STORE LAST CHANNEL
MDE PAGES R STANDBY FREQUENCY
R BATTERY VOLTAGE
R CHANNEL MEMORY
LOW BATT THR 10.5 V AR6201-(X2X)
21.0 V AR6201-(X1X)
CONFIG £ TANDEM
£ AUX_IN
R AUTO ISOL IN TX
£ SCAN BEEP
£ FREQ CHANGE BEEP
£ SWAP MIKE IC
IN/OUT CFG1 MICROPHONE 1
˜ STD 1 MIKE
™ STD 2 MIKE
™ STD 3 MIKE
™ DYN MIKE
™ NONE
MICROPHONE 2
™ STD 1 MIKE
™ STD 2 MIKE
™ STD 3 MIKE
˜ DYN MIKE
™ NONE
MIC ACTIVATION
R BOTH MIKES
OUTPUTS
R HEADPHONE 1
™ HEADPHONE 2
˜ SPEAKER
™ NONE
IN/OUT CFG2 MICROPHONE 1
˜ STD 1 MIKE
™ STD 2 MIKE
™ STD 3 MIKE
™ DYN MIKE
™ NONE

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Setting name Value

MICROPHONE 2
™ STD 1 MIKE
˜ STD 2 MIKE
™ STD 3 MIKE
™ DYN MIKE
™ NONE
MIC ACTIVATION
R BOTH MIKES
OUTPUTS
R HEADPHONE 1
˜ HEADPHONE 2
™ SPEAKER
™ NONE
STD1 MIKE SENS 119 mV visible depending on
STD2 MIKE SENS 119 mV MIKE configuration of
external MIKE Switch
DYN MIKE SENS 3.5 mV
SPKR VOL SRC ™ Primary CH
™ SECONDARY CH
˜ BOTH
SQUELCH THR 12

SCAN HOLD TIME 1

SIDETONE ATT 6

EREASE CHANNEL MEM

NO

YES

EREASE FREQUENCY LABELS

NO

YES

FAIL LIST

EREASE FAIL LIST

NO

YES

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Setting name Value

RECALL DEF.
NO

YES

2.9 Typical Installations with Recommended Settings and Wiring Diagrams

2.9.1 Single Seat Glider

Installation Setup for Single Seat Glider

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE PRIMARY CH

“IN/OUT CFG1”: “MICROPHONE 1”: NONE
“MICROPHONE 2”: DYN_MIKE
“BOTH MIKES”: Enabled
“HEADPHONE 1”: Enabled
“SPEAKER”: Enabled

With /MIKE_SW not connected (/MIKE_SW input

is set to Inactive state) it is only
necessary to configure IN/OUT CFG1.
If only headphone(s) are used, SPEAKER can
be disabled by selecting NONE.
If only speaker is used, disable HDPH 1.

DYN MIKE SENS Adjust DYN MIKE SENS to proper level

VU
20 dB 2.5 mV

If you want to use an auxiliary input we

recommend to configure AUX AUTO MUTE
In CONFIG menu set:
· AUX IN – ENABLE
· AUX AUTO MUTE - ENABLE
“IN/OUT FG2” N/A
Remarks Permanent speaker sign is visible on LCD
screen.
VOX operation suppressed.

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Installation Wiring Diagrams

Figure 2-19: Typical Wiring for Single Seat Glider

Note: Frequency Exchange Switch and Switched Supply Relay are optional

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Figure 2-20: Typical Wiring for Single Seat Glider (5-pol DIN Jack)

Note: Frequency Exchange Switch is optional

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2.9.2 Twin Seat Motor Glider

Installation Setup for Twin Seat Motor Glider

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” “MICROPHONE 1” : STD_1 MIKE

(/MIKE_SW open): “MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Disabled

“IN/OUT CFG2” “MICROPHONE 1” : NONE

(/MIKE_SW closed): “MICROPHONE 2” : DYN_MIKE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Enabled

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:

· Open:
o Standard microphone is selected.
o Speaker is disabled.
o Intercom via VOX is possible.
· Closed:
o Dynamic microphone is selected.
o Speaker is enabled.
o No Intercom via VOX is possible.
o Permanent speaker sign is
visible on LCD screen.

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Installation Wiring Diagram

Figure 2-21: Typical Wiring for Twin Seat Motor Glider

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2.9.3 General Aviation (GA) Aircraft using Standard Microphones

Installation Setup for General Aviation GA Aircraft using Standard Microphones

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW open): “MICROPHONE 2” : NONE
“BOTH MIKES” : Disabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Disabled

“IN/OUT CFG2” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW closed): “MICROPHONE 2” : NONE
“BOTH MIKES” : Disabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Enabled

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:

· Open:
o Speaker is disabled,
o Intercom via VOX is possible.
· Closed:
o Speaker is enabled
o No intercom via VOX is possible
o Permanent speaker sign is
visible on LCD screen.
The standard microphone input is selected
regardless of the position of the external
switch.

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Installation Wiring Diagram

Figure 2-22: Typical wiring for usage of standard hand mikes, earphones and speaker

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2.9.4 Installation Setup for individual dual headset configuration

(two IC circuit)

Installation Setup for individual dual headset configuration (two IC circuit)

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW open): “MICROPHONE 2” : STD2_MIKE
“BOTH MIKES” : Disabled
“HEADPHONE 1” : Enabled
“HEADPHONE 2” : Enabled
“SPEAKER” : Disabled

The standard microphone remains selected for

both configurations
“IN/OUT CFG2” “MICROPHONE 1” : STD1_MIKE
(/MIKE_SW closed): “MICROPHONE 2” : STD3_MIKE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Disabled
“SPEAKER” : Enabled

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:
· Open:
o Headset 1 for pilot selected
(STD1)
o Headset 2 for copilot selected
(STD2)
o Speaker is disabled,
o Intercom via VOX is possible.
· Closed:
o Headset 1 selected (STD1)
o Headset 2 disconnected (STD2)
o Hand mike selected (STD3)
o Speaker is enabled
o No intercom via VOX is possible

if PTT is active then speaker is muted.

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Installation Wiring Diagram

Figure 2-23: Typical dual wiring for usage of standard hand mikes, earphones and speaker

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2.9.5 Installation Setup for Twin Seat with AR6201 Tandem Configuration

Installation Setup for Twin Seat with AR6201 Tandem Configuration

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW open): “MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Disabled

If only headphone(s) are used, SPEAKER can

be disabled by selecting NONE.
If only speaker is used, HDPH 1 can be
disabled.
The standard microphone remains selected for
both configurations

“IN/OUT CFG2” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW closed): “MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Enabled

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:
· Open:
o Headset 1 for pilot selected
o Headset 2 for copilot selected
o Speaker is disabled,
o Intercom via VOX is possible.
· Closed:
o Headset 1 selected (STD1)
o Headset 2 disconnected (STD2)
o Hand mike selected (STD3)
o Speaker is enabled
o No intercom via VOX is possible
o
if PTT is active then speaker is muted.

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Installation Wiring Diagram

Figure 2-24: Typical Wiring for Twin Seat with AR6201 Tandem Configuration

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2.9.6 Wiring for Aircraft with Four Seats (no TANDEM)

Installation Setup for Aircraft with Four Seats (no TANDEM)

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” (/MIKE_SW open): “MICROPHONE 1” : STD1_MIKE

“MICROPHONE 2” : STD3_MIKE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Disabled
“SPEAKER” : Enabled

If only headphone(s) are used, SPEAKER can

be disabled by selecting NONE.
If only speaker is used, HDPH 1 can be
disabled.
The standard microphone remains selected for
both configurations

“IN/OUT CFG2” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW closed): “MICROPHONE 2” : STD2_MIKE
“BOTH MIKES” : Disabled
“HEADPHONE 1” : Enabled
“HEADPHONE 2” : Enabled
“SPEAKER” : Disabled

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Sub-Menu Function: / Selection

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:

· Open:
o Headset 1 and 2 for pilot and
copilot selected
o Headset 3 and 4 for passengers
selected
o Speaker is disabled,
o Intercom via VOX is possible.

· Closed:
o Headset 1 and 2 for pilot and
copilot selected
o Headset 3 and 4 disconnected
o Hand mike selected (STD3)
o Speaker is enabled
o No intercom via VOX is possible

If PTT is active then speaker is muted.

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Installation Wiring Diagram

Figure 2-25: Typical Wiring for Aircraft with Four Seats (no TANDEM)

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2.9.7 Installation with RT6201

RT6201 with primary controller RCU6201 can be used in all installation

wirings presented above. RT6201 with RCU6201 replace AR620X. The connection
between RT6201 and RCU6201 is shown in the wiring diagram below. For other
equipment connection see dedicated figure above.

Installation Wiring Diagram

Figure 2-26 Typical Wiring for RT6201 with RCU6201 as Primary Controller

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2.9.8 Aircraft with Intercom System

Installation Setup for Aircraft with Intercom System

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1”: “MICROPHONE 1” : STD1_MIKE

“MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Disabled

“IN/OUT FG2” “MICROPHONE 1” : STD1_MIKE

“MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Enabled

Remarks The same configuration applies for balanced

and unbalanced wiring.

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Installation Wiring Diagram

Figure 2-27: Typical wiring for aircraft with Intercom System (unbalanced)

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Installation Wiring Diagram

Figure 2-28: Typical wiring for aircraft with Intercom System (balanced)

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2.9.9 Installation Setup for Twin Seat with RT6201 Tandem Configuration

Installation Setup for Twin Seat with RT6201 Tandem Configuration

Sub-Menu Function: / Selection

“SPKR VOLUME SOURCE BOTH

“CONFIGURATION” “SWAP MIKE IC” : Disabled

“IN/OUT CFG1” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW open): “MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Disabled

If only headphone(s) are used, SPEAKER can

be disabled by selecting NONE.
If only speaker is used, HDPH 1 can be
disabled.
The standard microphone remains selected for
both configurations

“IN/OUT CFG2” “MICROPHONE 1” : STD1_MIKE

(/MIKE_SW closed): “MICROPHONE 2” : NONE
“BOTH MIKES” : Enabled
“HEADPHONE 1” : Enabled
“SPEAKER” : Enabled

Remarks The external switch

(connected to pin J1-24 /MIKE_SW)
has the following functions:
· Open:
o Headset 1 for pilot selected
o Headset 2 for copilot selected
o Speaker is disabled,
o Intercom via VOX is possible.
· Closed:
o Headset 1 selected (STD1)
o Headset 2 disconnected (STD2)
o Hand mike selected (STD3)
o Speaker is enabled
o No intercom via VOX is possible
o
if PTT is active then speaker is muted.

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Installation Wiring Diagram

Figure 2-29: Typical Wiring for Twin Seat with RT6201 Tandem Configuration

Note: Setup configuration only via Primary RCU

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2.10 Retrofitting an AR4201 with an AR620X

In most cases, a retrofit of the AR4201 with an AR620X will not cause any
problems.
However, in a few cases differences may occur due to pin incompatibility.
Connecting the AR620X to an AR4201 wiring will NOT damage the AR620X or the
aircraft installation.

2.10.1 Pin Compatibility

Pin AR4201 AR4201 AR6201 AR6201 Full

No. Pin Name Function Pin Name Function compatible

Speaker output, Speaker output,

P1-1 AF-ASYM SPK_HI Yes
unbalanced unbalanced

Headphone output, Headphone 1 output,

P1-2 AF-HI HDPH1_A Yes
balanced balanced

Headphone output, Headphone 1 output,

P1-3 AF-LO HDPH1_B Yes
balanced balanced

Auxiliary audio Auxiliary audio

P1-4 AFAUX AF_AUX_IN_HI Yes
input, unbalanced input, unbalanced

Dynamic microphone Dynamic microphone

P1-5 MIKE DYN input, high side, MIKE_DYN_HI input, high side, Yes
unbalanced balanced

Ground for dynamic Dynamic microphone

P1-6 MIKE GROUND microphone, MIKE_DYN_LO input, low side, No
unbalanced balanced

P1-7 IC Intercom input IC Intercom input Yes

Input for
P1-8 TEMS1 MIKE_STD_LO Ground No
temperature sensor

Standard microphone
RS232-serial-data-
P1-9 RXD MIKE_STD2_HI 2 input, high side, No
line
unbalanced

Illumination, low Illumination, low

P1-10 -ILLUMINATION ILL_LO Yes
side side

Positive power Positive power

P1-11 +13.75V P_SUPP Yes
supply supply

Positive power Positive power

P1-12 +13.75V P_SUPP Yes
supply supply

Power supply return Power supply return

P1-13 GROUND P_SUPP_GND Yes
/ Ground / Ground

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Pin AR4201 AR4201 AR6201 AR6201 Full

No. Pin Name Function Pin Name Function compatible

AF GND
P1-14 Ground SPK_LO Ground Yes
MIKE STD GND

Normally not used Normally not used in

P1-15 AFCU LINE_OUT No
in installation installation

Normally not used Normally not used in

P1-16 AGC/AFWB AGC_OUT No
in installation installation

P1-17 PTT Press to talk /PTT Press to talk Yes

Standard microphone Standard microphone

P1-18 MIKE STD1 input, high side, MIKE_STD1_HI 1 input, high side, Yes
unbalanced unbalanced

Used for Standard microphone

P1-19 CODE PIN identification of MIKE_STD3_HI 3 input, high side, No
the connection unbalanced

Headphone 2 output,
P1-20 TEMS2 Headphone 2 HDPH2_A No
balanced

P1-21 GNDDATA Ground AF_AUX_IN_LO Ground Yes

RS232-serial-data- Headphone 2 output,

P1-22 TXD HDPH2_B No
line balanced

Illumination, high Illumination, high

P1-23 ILLUMINATION ILL_HI Yes
side side

Power on monitor Power on monitor

+13.75V
P1-24 Switched positive /PWR_EVAL Open collector No
SWITCHED
power supply. output. GND if On.

Power supply return Power supply return

P1-25 GROUND P_SUPP_GND Yes
/ Ground / Ground

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2.10.2 Dynamic Microphone Input

Retrofitting an AR4201 with the AR620X in a typical glider installation with

a dynamic microphone is shown below:

MIKE_DYN_HI 5 5
Dynamic Mike
MIKE_DYN_LO 6 6
MIKE_STD_HI 18 18
MIKE_STD_LO 8 8

Figure 2-30: AR6201 with wiring interface for AR4201

Connect the cable shielding to pin P1-6, which is the low side input for
dynamic microphone. Because in AR620X this input is balanced, the cable
shield is no longer connected to ground (unlike it was with the AR4201). In
most cases, it is not a problem.
If interference with the microphone signal does occur, it is recommended to
carry out the following modification:

Connect Pin P1-6 with Pin P1-8 (the cable shield is grounded). See figure
below.

MIKE_DYN_HI 5 5
Dynamic Mike
MIKE_DYN_LO 6 6
MIKE_STD_HI 18 18
MIKE_STD_LO 8 8

Figure 2-31: Modified dynamic microphone wiring interface for AR6201

2.10.3 Temperature Sensor

The AR620X has no temperature sensor input. Remove wire from pin P1-8 and pin
P1-20.

2.10.4 RS-232 Interface

The AR620X has no RS-232 interface for remote control. Remove wire from pin
P1-9 and pin P1-22.

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2.10.5 AFCU/AGC/AFWB

Not used in aircraft installations, remove pins P1-15 and pin P1-16.

2.10.6 CPIN

No influence in retrofit installation

2.10.7 +13.75V Switched

The AR620X provides on pin P1-24 a low signal when the unit is switched on
and a high impedance signal, when switched off. This is not compatible to the
AR4201, which provided a positive power supply when switched on and high
impedance when switched off.

In cases where slave equipment needs to be switched ON / OFF in sync with the

To switch the transceiver ON/OFF connect a relay to pin P1-24.

2.10.8 PWR_EVAL

The AR620X provides on pin P1-24 a low signal when the unit is switched on
and a high impedance signal, when switched “OFF”. This function is different
to the AR4201, which provides supply voltage out when switched “ON” and no
supply voltage when switched “OFF”.

In cases where slave equipment needs to be switched ON / OFF in sync with the
switching ON / OFF the AR6201-(XX) connect a relay to pin P1-24.

2.11 Post Installation Tests

Note: It is assumed that the “Installation Setup” (Chapter 2.8) has been done
before the Post Installation Tests will be carried out.

Once the AR620X is installed, complete a test procedure to verify system

functionality. Ensure compliance with authority required procedures. Refer to
the installation order of the minor change document or use an own approved
test protocol for VHF units. The following chapter below provides guidance
for such tests.

2.11.1 Mechanical Installation and Wiring Check

Verify all cables are stored securely and shields connected properly to
signal ground. Check the movement of aircraft controls to verify there is no
interference.

Verify all screws are tight and the connectors on the rear side of the unit
are secured.

2.11.2 Power Supply

Check the power supply lines and confirm correct polarity. Confirm that the
aircraft power supply is within the specified limits, with and without a
running engine.

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2.11.3 Receiver / Transmitter Operation

Power up the AR620X and tune it to a local station for a communication test.
Verify that the receiver output produces a clear and readable audio and ask
the local station for proper readability of the AR6201´s transmit signal.
Repeat this communication test with an airborne station within ≈ 20-40 NM
(Nautical Miles).

2.11.4 Antenna Check

Check the VSWR (voltage standing wave ratio) over the complete frequency band
(e.g. by using a VHF Reflection-Coefficient Meter).

The VSWR ratio should be less than 2:1 and is not acceptable when exceeding
3:1.

2.11.5 Interference Check

Check the AR620X while engine is running and all other avionics/ electrical
systems on the aircraft are powered, to verify that no significant
interference exists. Check also that the AR620X does not cause significant
interference with other systems.

The installer´s standard test procedure may be used for the interference
check and the below table can be taken as a reference.

Depending on the individual avionic systems installed in the aircraft, it

might be necessary to extend the following checklist accordingly.

Aircraft System Function

OK NOT OK

DME

Audio

Generators / Inverters

GPS System

Compass 1

ADF

VHF / NAV1 all channels

VHF / NAV 2 all channels

Marker Beacon

Motor(s)

Engine Instruments

Stormscope

Transponder

Air Data Computer

Autopilot and Servos

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Power the GPS and make sure that not less than 5 satellites are tracked.

Check the interference between the VHF-COM and the GPS receiver (when
activated in NAV mode). Select the following channels/frequencies on the
AR620X and on each frequency stay in TX and RX mode for at least 30 seconds.
Verify that GPS integrity Flag is always out of view.

Channel Frequency
(MHz)

121.140 121.1416

121.150 121.1500

121.155 121.1500

121.160 121.1583

121.165 121.1666

121.175 121.1750

121.180 121.1750

121.185 121.1833

121.190 121.1916

121.200 121.2000

121.205 121.2000

121.210 121.2083

131.240 131.2416

131.250 131.2500

131.255 131.2500

131.260 131.2583

131.265 131.2666

131.275 131.2750

131.280 131.2750

131.285 131.2833

131.290 131.2916

131.300 131.3000

131.305 131.3000

131.310 131.3083

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For the remaining avionic equipment repeat all interference checks during a
flight and include all equipment not previously checked out on ground.

A communication performance check in the low, mid and high frequency band of
the AR620X should be included. Verify the receiver output produces a clear
and understandable audio output. Verify the transmitter by contacting another
station and getting a report of reliable communications.

Perform the range check with a station at least 100 m from your own position.

Check the intercom function by talking into the microphone, while the engine
is running at cruising rpm. You should hear yourself and/or your co-pilot
loud and clear.

Switch “ON” the squelch and check that the normal radio noise, without a
present carrier signal, it will be constantly suppressed. The threshold of
the squelch can be set in the pilots menu.

2.11.6 Flight Test Check

It is highly recommended to perform flight test as final installation

verification. The performance of the AR6201-(X1X) may be verified by
contacting a ground station at a range of at least 50 nm while maintaining an
appropriate altitude and over all normal flight attitudes. Check the
performance in the low, mid and high band frequencies.

2.12 Trouble Shooting

Problem Possible Reason Proposed Solution

Intercom function is not The VOX is switched off or Adjust the VOX to a lower
working. adjusted to a too high value. A value of “-15” is
value. suitable in most cases.
(You can’t hear yourself Refer to chapter 2.7.
when talking into the
The intercom volume is Adjust the intercom volume
microphone).
adjusted to a too low to a higher value. A value
value. of “37” produces already a
quite loud intercom
signal.
Refer to chapter 2.7.

The sensitivity of the Adjust the sensitivity of

microphone input is not the microphone input to a
sufficient. The level is lower value. For most
adjusted to a too high common avionic headsets a
value. setting of 50…120 mV is
sufficient.
Refer to chapter 2.7.

The VOX threshold cannot VOX is forced off, because Switch speaker “OFF”.
be adjusted at all. VOX is speaker is on. Refer to chapter 2.7.
always off.

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Problem Possible Reason Proposed Solution

Too high cabin noise The sensitivity of the Adjust the microphone
during intercom / transmit microphone input is too sensitivity to a higher
operation. sensitive. value to ensure the cabin
noise is reduced.
Recheck transmit operation
and/or Intercom function.
Refer to chapter 2.7.

Speaker output is not Speaker is switched off Switch Speaker “ON.

working. Refer to chapter 2.7.

The noise suppression Some avionic (especially Reduce the interference

function of the squelch is non ETSO/TSO approved emitted by the avionic
not working. avionic) can produce quite around by improving
high electromagnetic shielding, distance or
(Receiver noise is always interference, which may be grounding.
present). received by AR6201-(). The interference may also
be suppressed by adjusting
the squelch to a higher
value. Refer to chapter
2.7.
Note, that a higher value
will cause a reduced
sensitivity.

The display shows a Refer to “Warning and Refer to “Warning and

warning or failure message Failure Indications” in Failure Indications” in
(LOW BATT, STUCK PTT, TX chapter 3.14 chapter 3.14
HOT, FAILURE)

The Antenna VSWR exceeds Possibly caused by a Check for sufficient size
3:1. defective or insufficient of the counterpoise and
counterpoise for the make sure there is no
antenna. mechanical defect on the
antenna.

The impedance of the Make sure the used antenna

antenna cable deviates cable has 50 Ω impedance
significantly from 50 and the cable is not
Ohm. pinched or kinked on its
way from the radio to the
antenna
Faults on the BNC Check for proper
connectors of the antenna crimp/solder work on the
cable. BNC connectors and rectify
as far as necessary.

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2.13 Continued Airworthiness

The 620X transceiver maintenance is defined as “on condition” only. No

scheduled or regular maintenance of this product is required.

It is recommended to check the frequency accuracy of the airborne transceiver

after 7 years.

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Section 3 OPERATION

Note 1: In this section the figures for illustrating display content mainly
show transceivers working in 8.33 + 25 kHz mixed mode. Dedicated
pictures for 25 kHz mode are not explicitly shown, as the display
content is very similar (They differ only in number of digits for
frequency).

Note 2: The HMI actions described in this section can be performed on

primary controller or on optional secondary RCU6201 controller.

Note 3: The following graphics of the AR6201-(XXX) display content show the
8.33 kHz channel spacing for all possible operation modes.

3.1 Safety Instructions

This chapter contains general operating instructions for the AR6201-XXX to

ensure safe operation of the VHF transceiver.

Switch OFF the unit before starting or shutting down engines.

To minimize background noise, to ensure a crystal-clear reception by the

receiving station and to improve reception quality ensure the microphone is
close to the lips and speak in a clear loud voice.

Before startup a speech test is to be performed. If the speech test is

carried out close to the ground station the results may be positive even if
the antenna cable is broken or a short-circuit exists. In this case at a
distance of 5 to 10 km communication might not be possible.

Use only microphones or headsets which are suitable for use in aircraft. It
is highly recommended to use the same type microphones or headsets, which are
suitable for use in aircrafts. In aircraft made of wood or synthetic
materials, in gliders or helicopters, incoming radiation can affect the
integrated amplifier of the microphone (feedback). This is noticeable in the
ground station by whistling and/or heavy distortion. The described
disturbances can occur in different ways on the different transmission
frequencies.

If the power supply voltage drops below the “Low Battery Threshold” (default
value is 10.5 V), the “LOW BATTERY” message will appear each 3 seconds in the
lower part of the display.

IF the power supply voltage drops below 10 V the system enters power saving
mode:

· speaker output of the transceiver is automatically switched “OFF”

· the speaker sign will no longer be presented on LCD display

· the pilot must use headphones to continue listening.

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3.2 Controls and Indicators

Figure 3-1: controls and indicators on AR6201 or RCU6201

3.2.1 Controls

Symbol Description Main Function

A ”Short press” during normal operation
toggles the
IC/SQL RX -SQL ON/OFF.
1
(Intercom/Squelch)
A “Long press” during normal operation
activates Intercom Menu.

“Short press” during normal operation

MDE changes the frequency selection mode.
2
(Mode) “Long press” during normal operation
activates the pilots menu.

STO ”Short press” during normal operation

3
(Store) activates storage procedure.

”Short press” during standard mode or scan

↨/SCN mode toggles between preset and active
4 frequency.
(Exchange/SCAN)
. “Long press” activates scan mode.

Switches the transceiver ON/OFF and adjusts

5 Volume Knob
volume level of received signal.
Turning “ROTARY ENCODER” changes the
settings of several parameters (frequency,
IC-volume, VOX …).
6 Rotary encoder
Pushing the “ROTARY ENCODER” toggles
between the digits and acts as an enter
key.

7 Display

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When pressing and holding down a key for at least 2 seconds, the 620X detects
a “long press”. Otherwise a “short press” is assumed.

If any action by the user is invalid the whole display is inverted for a
short time. For example when pressing a key and the operation is not allowed
at that time.

3.2.2 Symbols Shown on the Display

Symbol Function
IC Intercom operation active (triggered by VOX or external IC
key).
Intercom operation via VOX is disabled.

TX The transceiver is in transmit operation

SQL The squelch function is active. Weak signals will be
suppressed.
SCAN Transceiver operates in scan mode.
STO The transceiver performs a storage operation.
LOW BATT
128.225 Inverted figures or letters on display ready to edit

3.3 Start-Up

CAUTION: Do not switch ON the 620X VHF transceiver or RCU6201 during engine
start or shutdown

Note: Excessive pulses on the DC bus of the aircraft may cause damage on
electrical circuits of any installed instrument.

a. Turn “ON” the VHF transceiver by turning the volume knob clockwise.

b. During PBIT the display indicates the message ”WAIT”, the software version
of “Control Head” (CH) and the software version of “Chassis Module” (CM)
are indicated.

c. If the PBIT has detected error(s), the display indicates ”FAILURE” (for
details see chapter 3.14).

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3.4 Receive and Transmit Mode

3.4.1 Receive Mode

If /PTT1 and /PTT2 inputs are inactive, the transceiver remains in receive
mode.

In receive mode the headphone(s) outputs (if enabled) provide a mixed signal
consisting of:

· Received signal from antenna,

· Intercom signal from intercom circuit one and two,

· Signal from auxiliary input.

In receive mode the speaker output (if enabled) provides a mixed signal
consisting of:

· received signal from antenna

· signal from auxiliary input

The signal from the auxiliary input can be muted under certain conditions.
For details refer to chapter 3.10.

The signal from intercom can be attenuated or muted under certain conditions.
For details refer to chapter 3.11.

3.4.2 Transmit Mode

If /PTT input is active (PTT key is pressed) the transceiver switches to

transmit mode. Microphone(s) signals can modulate the transmitter.

· PTT 1 input activates transmission from microphone path 1

· PTT 2 input activates transmission from microphone path 2

· If BOTH MIKES are active/enabled in the installation setup, each input

(PTT 1 or 2) activates the transmission from both microphone paths
simultaneously.

The “TX” symbol in the left upper corner of the display indicates the AR6201-
(XXX) is in transmit mode.

In transmit mode several user actions such as changing frequency selection

mode or channel spacing mode, which are normally allowed in receive mode, are
blocked. (As an exception in standard mode the “Preset” frequency may still
be changeable, even during transmission.)

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No intercom operation is possible in transmit mode.

The sidetone (demodulated audio of the emitted signal) is available on the

headphone output. The transmit mode automatically deactivates the speaker.

Note: Transmit mode is automatically terminated (return to receive mode)

after 120 seconds of continuous transmitting even if PTT is still
pressed. In this case “STUCK PTT” is indicated (refer chapter 3.14).
For initiation of a new transmission, /PTT line needs first to
become inactive.

3.5 Frequency Selection Modes

Following frequency selection modes are available on AR620X and RCU6201:

· Standard mode

· Direct tune mode

· Channel mode

· Scan mode (sub-mode within standard mode)

The first three modes (standard mode, direct tune mode and channel mode)
provide different user interfaces for convenient selection of the operating
frequency. The three frequency selection modes can be toggled by consecutive
short pressing of “MDE” key. They will be toggled in the following order:
standard mode, direct tune mode, channel mode, standard mode, and so on. When
toggling between the three modes the active frequency always remains the
same.

The forth mode is a special mode called SCAN-Mode. Scan mode is a sub-mode of
standard mode and is used for monitoring two frequencies at the same time. A
2 seconds press on “↕/SCN” key activates/deactivates the scan function.

Out of the three pages from the frequency selection modes any page can be
enabled or disabled in the installation setup but at least one page must
remain selected.

3.5.1 Standard Mode

Press the “MDE” key until the standard mode page appears.

The standard mode page displays the active frequency in the top line and
preset frequency in the bottom line.

IC118.005
127.000
SQL

Changing the active frequency is not possible in standard mode (only

available in direct tune mode) but changing the preset frequency is possible.

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To change the preset frequency

1. Press the “ROTARY ENCODER“ to select the 100 MHz digits. Then rotate the
“ROTARY ENCODER” clockwise/counter clockwise to change the frequency.

2. Press the “ROTARY ENCODER“ again to select the 100 kHz digits. Then
rotate the “ROTARY ENCODER” clockwise/counter clockwise to change the
frequency.

3. Press the “ROTARY ENCODER“ again to select the 25/8.33 kHz digits. Then
rotate the “ROTARY ENCODER” clockwise/counter clockwise to change the
frequency.

A short press of the “↨/SCN” key toggles between active and preset frequency.

Note: While the transceiver is in transmission mode, the toggle function

is disabled.

Press the “STO” key to store the active frequency into the next vacant memory
place in the user channels database.

3.5.2 Direct Tune Mode

Press the “MDE” key until the direct tune mode page appears.

Note: If BATTERY VOLTAGE in the installation setup is deselected, this mode

is not accessible! Only standard or channel mode are accessible.

In direct tune mode the active frequency is indicated in the top line. It can
be edited by means of the “ROTARY ENCODER” following the procedure. The
battery voltage, indicated in the bottom line shows the current value of the
supply voltage.

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To change the active frequency when in direct tune mode;

1. Press the “ROTARY ENCODER“ to select the 100 MHz digits. Then rotate the
“ROTARY ENCODER” clockwise/counter clockwise to change the frequency.

2. Press the “ROTARY ENCODER“, again to select the 100 kHz digits. Then rotate
the “ROTARY ENCODER” clockwise/counter clockwise to change the frequency.

3. Press the “ROTARY ENCODER“, again to select the 25/8.33 kHz digits. Then
rotate the “ROTARY ENCODER” clockwise/counter clockwise to change the
frequency.

Notes:

1. The changes become active immediately

2. Changing the active frequency is possible only when the transceiver is

not transmitting

If wanted press the “STO” key to store the active frequency into the next
vacant memory place in the user channels database.

3.5.3 Channel Mode

Note: The channel database provide storage of CH01 to CH99 and LAST1 to
LAST9.

Press the “MDE” key until the channel mode page appears.

The channel mode shows data from user channels database (indicated by “CH”),
or last channels database (indicated by “LAST”) and labels database on the
display.

After selecting channel mode, the active frequency remain indicated in the
top line. If this frequency has an already assigned channel number, channel
number and the text label appear in the bottom line of the display. If the
active frequency has no assigned channel number the indication in the bottom
line is “CH--”.

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By means of channel number (CH01 to CH99 or LAST1 to LAST9) stored VHF
frequencies can be selected. Then the top line shows the corresponding VHF
frequency assigned to the specific channel number.

If the same frequency is stored a second time, then the existing stored label
for that frequency will automatically be reassigned to the new channel
number.

User Channel Database

In order to select a new channel number from USER channels database either;

· Make a short press of the “ROTARY ENCODER“.

or

· Make one clockwise turn of the “ROTARY ENCODER“.

The channel number is now highlighted and the channel can be changed turning
the “ROTARY ENCODER“ either clockwise or counter clockwise. At each step the
receiver tunes immediately to the displayed VHF frequency.

Note: If user channel CH01 is displayed the first turn counter-clockwise of

the “ROTARY ENCODER” will enter to the “LAST” channel no.1. Afirst
turn clockwise in channel mode provide navigation up and down between
user channels CH01 to CH99.

The channel mode can be deselected by repeated pressing of the “ROTARY

ENCODER” or the mode is left automatically after a 5 second timeout.

Last Channel Database

In order to select the new channel number from LAST channels database make a
counter clockwise turn on the “ROTARY ENCODER“. The channel number is now
highlighted and one of the nine last used channels is selectable by turning
the “ROTARY ENCODER“ either clockwise or counter clockwise. The mode of
channel number selection can be left manually by repeated pressing of the
“ROTARY ENCODER“, or the mode is left automatically after a 5 seconds
timeout.

When leaving the LAST channels database and the last shown frequency is not
stored in one of the USER cannels database, “CH--”will appear on the display.

Accessing the last channels database will be possible if “STORE LAST CHANNEL”
is selected on MEMORY OPTIONS page in the installation setup, otherwise the
recently stored VHF frequencies will not be available.

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125.875 125.875
SQL SQL
CH LAST
E DS B - T 1 E DS B - T 1
Note: If the device is operating in the 25 kHz mode a selection of an
earlier stored 8.33 kHz channel is not possible. For selection of
8.33 kHz channels, the device has to be operated in 8.33 + 25 kHz
mixed mode.

3.5.4 Scan Mode

In all frequency selection modes;

1. A long press of “↕/SCN” key activates the scan function and changes to
STANDARD MODE if activated from CHANNEL or DIRECT TUNE mode.

2. A short push on the “MDE” key or a long press on “SCN” key terminates
scan function. After leaving scan function, the device will remain in
standard mode (chapter 3.5.1).

In scan mode the display shows both the active frequency on the top line and
the preset frequency on the bottom line. The SCAN sign in the display
indicates that scan function is active.

If both the active frequency and preset frequency simultaneously detect a

signal, the active frequency takes priority. The preset frequency then
inverts and blinks. The arrow sign “►” in front of the active frequency
indicates that this frequency is audible. The figure below shows a sample.

Blinking

If selected in the installation setup an audio notification “beep” tone

becomes audible in addition to the blinking preset frequency to indicate the
presence of an RX signal on the preset frequency.

Reception on Preset Frequency in Scan Mode

If the preset frequency detects a signal while no signal is present on the

active frequency, the transceiver automatically switches over to the preset
frequency.

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The arrow sign now appears in front of the preset frequency and the signal is
audible. A sample display shows the picture below.

Note: Transmission always uses the active frequency, even if the monitored
frequency is currently audible.
If TX on the preset frequency is required push the “↨/SCN” key to
swap active and preset frequency.

3.6 Squelch
Independent of the selected operation menu, squelch can be toggled “ON” or
“OFF” by a short press on “SQL/IC” key.

· If the squelch function is active (“ON”) the receiver noise is muted.

· If the Squelch is “OFF” the arrow sign “►” in front of the Active
Frequency stay visible all the time and receiver noise will be audible
as long as signal is received.

118.200 118.200
119.300 119.300
SQL

Squelch “ON” Squelch “OFF”

In the pilots menu, the squelch threshold is adjustable to a convenient

trigger level.

3.7 RX Field Strength Indication

The field strength indicator is represented by triangle on the left upper

corner of the corresponding frequency and will appear next to the active or
preset frequency in all frequency selection modes.

The field strength of the indicated incoming signals is based on measured

RSSI level. The three levels displayed are:

Weak Signal Strength Good Signal Strength Excellent Signal Strength

RSSI -88 > RSSI > -80dBm RSSI > -80dBm

passing squelch level (half-filled triangle) (fully filled triangle)
(empty triangle)

118.200 118.200 118.200

119.300 119.300 119.300
SQL SQL SQL

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3.8 Channel Spacing Mode

The transceiver provides two frequency channel spacing operation modes (8.33
kHz and 25 kHz), selectable by means of pressing “STO” and “MDE” keys
simultaneously for at least 2 seconds.

8.33 kHz channel spacing (left) / 25 kHz channel spacing (right)

Toggling of frequency channel spacing mode is only available for AR620X-(0XX)

variants. The AR620X-(1XX) variants cannot be toggled as those are working in
25 kHz Mode only.

In 25 kHz mode 5 frequency digits are shown. Only operating frequencies with
a channel spacing of 25 kHz are selectable. If 8.33 kHz channels are not in
use this mode provides the advantage of faster tuning since the 8.33 kHz
frequency steps are skipped.

In 8.33 and 25 kHz mixed mode 6 frequency digits are shown. The transceiver
tunes to all possible frequencies within the aviation VHF frequency band. The
channel spacing and operating frequency is derived automatically from the
selected and displayed frequency (refer chapter 1.6).

3.9 Storage Function

The VHF transceiver provides two databases:

1. User channels database - provides 99 channels identified as CH01 to CH99

or with individual labels with up to 10 characters. Any frequency can be
assigned to any CH within the VHF range from 118.000 MHz to 136.9916 MHz
by simply pressing the “STO” button. All 99 channels are editable, when
selected, after the “STO” button is pressed.

2. Last channels database - automatically stores nine last used frequencies,

identified and easy to recall as LAST1 to LAST9.

The user channels database can be edited manually by the pilots or,
uploaded/edited by using a PC-application connected to an interface port on
connector J1 of the AR620X.

3.9.1 Manual Storage Function

To modify the database select CHANNEL STORE option in the MEMORY OPTIONS page
in installation setup.

Press the “STO” key to activate the database modification in standard mode,
direct tune mode, or channel mode.

During this procedure the display looks similar to the channel mode with the
difference “STO” is displayed on the left side of the display. The display

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top line displays the active frequency and the bottom line displays the
already assigned or next vacant channel number. The channel number can be
selected by means of the “ROTARY ENCODER“. The label ”FREE” appears in front
of “CHXX” if the selected channel number is vacant. If the selected channel
number contains an already stored frequency ”USED” appears.

“FREE” and “USED” channel indication.

By entering the storage procedure, the transceiver will first propose the
next free channel for storing the active frequency. Beside the proposed
channel, any other channel in range 1 to 99 can be selected by turning the
rotary knob. For every selected channel “USED” or “FREE” is indicated.

Pressing the “STO” key once again assigns the Active Frequency to the
selected channel number, regardless of the channel is “FREE” or “USED”
indicated.

The transceiver automatically stores the alphanumeric label assigned to the

active frequency.

If the frequency has no label attached, ten underscore digits allow the
operator to insert a label. The cursor automatically appears on the first
position (see figures below).

By turning the “ROTARY ENCODER” characters can be selected. Selection works

in both directions (example: blank à A à B à C” by turning clockwise and “C
à B à A à blank by turning counter clockwise).

Each press of the “ROTARY ENCODER“ moves the cursor to the next position.

A short press of the “STO” key stores the label and a long press of the “STO”
key clears the currently edited label.

After storing labels, the transceiver returns back to the previous frequency
selection mode (standard mode / direct tune mode / scan function).

If no action occurs in label editing mode within 7 seconds, the transceiver

returns to the previous frequency selection mode without storing the
frequency and label information.

Stored frequencies can be recalled in channel mode (see chapter 3.5.3).

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3.9.2 Automatic Storage Function

The transceiver contains storage function, which automatically stores 9

recently selected VHF frequencies and updates the last channels database
during operation in standard mode, direct tune mode and scan-mode. To use
this function the STORE LAST CHANNEL option must be enabled in installation
setup on the MEMORY OPTIONS page.

When changing to a new active frequency, the previous active frequency is

stored “LAST” in memory channel CH1. The frequencies previously located in
CH1, CH2 … CH8 are shifted to memory channels CH2, CH3, … , CH9. This
algorithm ensures the last 9 used active frequencies are stored. Last used
frequencies “LAST” can be recalled in channel mode (see chapter 3.5.3).

3.10 Auxiliary Audio Input

The transceiver has a dedicated auxiliary audio input e.g. for MP3 player
connection.

When auxiliary input is enabled in the installation setup, the auxiliary

audio input signal is mixed with the received signal from antenna (passing
squelch) and the intercom signal (when activated).

When intercom works in ISOLATION mode, then auxiliary audio input signal is
provided on headphone 2 output even if radio communication
(transmission/receiving) is active.

AUX AUTO MUTE function depends on the AUX INPUT. It is selected via the
CONFIGURATION page in the installation setup. This function automatically
mutes the audio signal from the auxiliary audio input as long as the AR620X-
(XXX) detects (based on squelch evaluation) a RX signal or the user
deactivates the squelch manually. If this function is disabled the signal
from the auxiliary audio input is permanently audible on the audio output,
independently of the received signal or the squelch status.

Automatic aux attenuation functionality is coupled with the auxiliary audio

input. The level of the auxiliary input signal attenuates if intercom is
activated by VOX or by /IC discrete input. The auxiliary input signal reverts
to its previous value after intercom deactivation. The attenuation value can
be adjusted within the range from 0 to 40dB.

3.11 Intercom Operation

Intercom operation may be triggered automatically via VOX (with adjustable

threshold) or externally via intercom switch. The setting of VOX-threshold
and intercom volume is accessible in the pilot intercom menu, in tandem
configuration on primary controller only.

For a single block, the primary controller is the one directly connected to
VHF transmitter. For a remote VHF transmitter the primary controller is the
one connected to primary control interface.

VOX-threshold and intercom volume for the second intercom circuit is

controlled from secondary controller RCU6201 (secondary controller is the one
connected to secondary control interface).

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The transceiver has two internal built in intercom circuits. Therefore up to
four headsets can be connected. On the first intercom circuit the pilot and
copilot are connected. When the intercom is activated the signals from the
microphones are mixed and amplified to become audible on both headphone
outputs. This enables internal communication via headsets between both
pilots. On the second intercom circuit passengers can be connected.

ALL mode - Everyone connected to the intercom will hear all communications
(pilots hear passengers and passengers hear pilots).

ISOL mode - Provides separate intercoms for the pilots (intercom circuit one)
and the passengers (intercom circuit two). This allows pilots to communicate
with each other, and air traffic, while the passengers are isolated. The
passengers on the intercom circuit two can hear auxiliary audio (for example
from mp3 player) and can communicate with each other.

External “ISOL” input provides possibility to switch between ALL mode and
ISOL mode. If the /PTT1 input is active and ISOL is active the passenger
intercom operation on second intercom circuit is still possible.

In transmission mode intercom operation is degraded. During receive mode the

intercom operation may be activated automatically via VOX (with adjustable
threshold) or using the external intercom switch.

If intercom operation is active the “IC” sign is displayed.

Activation of Intercom Operation via VOX

Via VOX intercom operation is automatically activated (threshold adjustable

in the intercom menu). With additional RCU6201 VOX threshold for first
intercom circuit is adjustable from primary controller (AR620X or RCU6201)
and for second intercom circuit from second controller RCU6201.
Intercom activation via VOX is not possible if:
· Speaker is enabled (see next chapter)
· User switched the VOX off

In both cases the VOX is disabled and the display shows the sign to
indicate that activation via VOX is not possible.

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Activation of Intercom Operation via Intercom Switch

Via intercom switch (pin P1-7) independent of VOX or speaker status

(enabled/disabled) the intercom operation can be activated externally. The
external intercom switch has priority. During intercom operation the Speaker
output is disabled.

3.12 VOX & Speaker Operation

Depending on wiring and installation setup, the speaker may always be enabled
or the speaker can be enabled/disabled by switching configurations using
external switch /MIKE_SW.
When speaker is enabled and is not muted the display will show the sign.

118.005
127.000
SQL

With active speaker enabled in audio configuration, the VOX is always forced
“OFF” and intercom via VOX is not possible (to avoid oscillation of VOX due
to acoustical feedback). The AR6201-(XXX) disables VOX if enabling speaker in
active audio configuration.

With the transceiver in transmission mode the speaker output is muted

(switched “OFF”) even if speaker is enabled in current audio configuration in
one of the following cases:

· Intercom is activated by external intercom switch (I/C input).

· Power is below 10 V.

3.13 Menus

During normal operation in one of the frequency selection modes the following
menus can be activated:

· Intercom menu for adjustment of intercom volume and VOX threshold.

· Pilots menu for adjustment of panel brightness and squelch threshold.

3.13.1 Intercom Menu

A long press (2sec) on “IC/SQL” key activates the intercom menu starting with
intercom volume menu as first page after entering this menu. A short press on
“IC/SQL” key provides toggling between the pages.

A long press on “MDE” key terminates intercom menu, or the menu automatically
terminates after 5 seconds timeout.

The intercom menu consists of two pages:

· Intercom volume (first page)

· Intercom VOX (second page)

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Intercom Volume Menu

The active frequency is indicated in the top line of the display, while the
“IC VOLUME” label and below this a bar graph with numerical value are show in
the bottom line.

By means of the “ROTARY ENCODER“ the intercom volume can be changed from 0
(minimum volume) to 46 (maximum volume). The intercom volume setting affects
the intercom audio signal and sidetone signal routed to the headphone.

Intercom VOX Menu

The active frequency is indicated in the top line of the display, while the
“IC VOX” label and below this a bar graph with numerical value are shown in
the bottom line.

By means of the “ROTARY ENCODER“ the intercom VOX threshold can be changed
from -30 (most sensitive, even a very low microphone signal already triggers
the VOX threshold for Intercom operation) to +10 (VOX is less sensitive and
only high microphone signals trigger the VOX threshold for intercom
operation).

Note: At a setting for VOX threshold of -15 a convenient behavior of the VOX
should be achieved in most aircrafts. This requires that mike
sensitivity had been correct adjusted (installation setup). If the
mike sensitivity is incorrect adjusted, VOX may work not satisfying.

By changing the VOX threshold level to above +10, VOX can be switched “OFF”.
In this case, “OFF” replaces the numerical value indication (see figure
below):

With VOX switched “OFF”, activation of intercom operation using the external
intercom switch (/IC discrete input) is still possible at any time.

The VOX threshold level cannot be adjusted if the VOX is forced to be “OFF”
(due to Enabled speaker in current audio configuration).

In tandem installation AR620X adjust VOX threshold for first intercom

circuit, RCU6201 adjust VOX threshold for second intercom circuit.

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Note: In installation with the second controller AR620X adjusts VOX
threshold for Microphone 1 only while RCU6201 adjusts VOX threshold
for microphone 2 only.

3.13.2 Pilots Menu

Press the “MDE” key for 2 seconds to enter the pilots menu starting with
BRIGHTNESS menu as first page after entering this menu. Toggling between the
pages is provided by a quick press of the “MDE” key, or by a quick press of
the “ROTARY ENCODER“.

To exit the pilots menu either

· Wait 5 seconds without any switch selections.
· Press the “MDE” key again for 2 second,
· Press the “ROTARY ENCODER“ when the SQUELCH setting page is visible,

The pilots menu consists of two pages:

· BRIGHTNESS (first page)
· SQUELCH (second page)

BRIGHTNESS
The active frequency is indicated in the top line of the display. Underneath
the active frequency, the “BRIGHTNESS” label appears in combination with a
bar graph and the selected value.

The panel brightness for display illumination and pushbuttons can be changed
from 0 (illumination off) to 100 (maximum brightness) by turning the “ROTARY
ENCODER“.

Note: This page is not available if in installation setup the dimming input
is set to 14 V or 28 V. For this setting the aircraft dimming circuit
controls the brightness parameters.

SQUELCH

By a short press of the push button of the rotary encoder the next page
“SQUELCH” is displayed. The active frequency is indicated in the top line of
the display. On the bottom line is indicated ”SQUELCH” with bar graph and
value.

By another press on the “MDE” key change to SQUELCH and by means of the
“ROTARY ENCODER“, the setting can be changed. The active frequency stays
indicated in the top line of the display and on the bottom line “SQUELCH”
label appears together with a bar graph and the current value.

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By turning the “ROTARY ENCODER” the squelch threshold can be adjusted:

· from 6 (very weak signals are audible with high noise content; squelch
opens at about -105 dBm)

· to 26 (only quite strong signals are audible with low noise content;
Squelch opens at about -87 dBm).

3.14 Warning and Failure Indications

Display Contents Description

“LOW BATT” is indicated if the supply voltage

of the transceiver is below the threshold
defined in the installation setup.

The transceiver is still operable but may have

a reduced performance depending on supply
voltage.
Possible reasons for indication:

Reappear every 3 seconds. · Accumulator capacity problems (gliders),

· Power interrupts,
· General power supply problems,
· Setting for low battery threshold too high
“STUCK PTT” is indicated after 120 seconds of
continued transmission. The transceiver goes
back to receive mode even if the PTT line is
still active (GND).

For initiating a new transmission, the PTT line

needs first to become inactive (open).
Possible reasons for indication:

Reappear every 3 seconds. · Transmission lasts more than 120 seconds.

· PTT-key is stuck.
· PTT line permanently grounded (short circuit
in installation).
“TX HOT” is indicated if the internal device
temperature exceeds +90°C.

Transceiver is still operable. Performance of

transmitter is reduced.
Possible reasons for indication:
Reappear every 3 seconds.
· Very hot environmental temperature, long

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Display Contents Description

transmissions times and insufficient airflow

conditions.
The transceiver has detected an internal
failure during normal operation.

Depending on failure reason, the device may be

still operable with degraded performance or not
operable at all.
Possible reasons for indication:

Reappear every 3 seconds. · Outside specified environmental conditions

· HW or SW failure inside the transceiver.
Contact maintenance shop for assistance.

The transceiver has detected an internal

failure during start up.

Depending on failure reason, the device may be

still operable with degraded performance or not

FAILURE operable at all.

PRESS ANY KEY Possible reasons for indication:

· Outside specified environmental conditions

· HW or SW failure inside the transceiver.

Contact maintenance shop for assistance.

The transceiver has no communication with the

controller.

Depending on failure reason, the device may be

FAILURE
still operable with degraded performance or not
operable at all.

Possible reasons for indication:

· Problem with inter-wiring

Contact maintenance shop for assistance.

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