MGL Avionics

VHF Air band transceiver

V10

User and installation manual

Issue 1, March 2009

General
Please read this manual before operating the V10 transceiver
Please include this manual if ownership of the V10 transceiver changes

Operational limitations, conditions and restrictions

Do not operate this device outside of its specified temperature range – this may result in
malfunction or damage to the device.
Observe the installation wiring diagrams. Incorrect wiring may damage this device.
Never operate this device outside of its specified voltage range. Doing so may cause serious
damage to this device.
At all times ensure that no reverse power polarity is applied to this device. Reverse polarity
will destroy this device.

This transceiver is designed to withstand the possible power surges that may be generated in
a correctly wired power supply system in a typical aircraft. For this reason the transceiver may
be left switched on when engines are started. Please note that the supply voltage may drop
below minimum operating voltage during engine cranking. During this time operation of the
radio will not be possible.

The V10 transceiver is not FAA certified for use in certified aircraft. This device may only be
used in aircraft where such a device is permitted under local rules.
Typically these rules permit operation in non-type certified aircraft such as home built and
experimental or sport category aircraft.
Limitations may exist on maximum altitudes a non-certified air band transceiver may not be
operated above. Please check your local rules with the relevant authorities.

Use of this radio may be subject to a radio station license. Please contact your local radio
frequency spectrum governing body (such as the FCC) as to the procedures required to
obtain a radio station license.
Operation of this transceiver may only be allowed by persons holding a valid radio license
(restricted or full).

Please do not operate this transceiver illegally.

Please do not operate this transceiver in an environment or in conditions where its

transmissions may cause interference with other electronic equipment or systems.

Never operate an air band radio without the required qualifications to do so.
Never cause a nuisance to aircraft on the ground or in the air by misuse of this transceiver in
any way.
Never compromise the safety of other aircraft with lengthy transmissions. Keep your
transmissions short and to the point following established air to air and air to ground rules and
procedures.
FCC statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.
This transceiver has passed laboratory tests to FCC rules part 2, part 15 and part 87 as
applicable.
This transceiver is registered with U.S. FCC under the following FCC ID: WSJV10

TSO qualifications
This transceiver is designed to meet he following TSO standards:
TSO-C37D, TSO-C38D, TSO-C128

DO160 qualifications
This transceiver is designed to the following EUROCAE ED-14D / RTCA DO-160D standards:
Section 4: Category C1. No external cooling required.
Section 5: Category C
Section 6: Category A
Section 7: Category B (shock and crash safety)
Section 8: Categories R and U
Sections 9-14: Category X – not required
Section 15: Category Z
Section 16: Category A and B
Section 17: Category A
Section 18: Category A and B
Section 19: Category Z
Section 20: Conducted category V
Section 21: Category B
Section 22: Power: Category A3C3, signals and digital comm: Category A1C1
Section 23, 24: Category X – not required
Table of Contents
General........................................................................................................................................2
Operational limitations, conditions and restrictions................................................................2
FCC statement............................................................................................................................3
TSO qualifications.......................................................................................................................3
DO160 qualifications...................................................................................................................3
The V10 transceiver introduction................................................................................................6
The V10 Panel.............................................................................................................................7
FLIP-FLOP mode....................................................................................................................7
Direct frequency entry mode...................................................................................................8
Dual watch system..................................................................................................................8
Frequency displays.............................................................................................................9
The status display...............................................................................................................9
V10 voltage and temperature monitoring...........................................................................9
Stuck PTT.........................................................................................................................10
Transmit signal modulator................................................................................................10
The V10 menu structure............................................................................................................11
The V10 buttons........................................................................................................................12
The “menu” button................................................................................................................12
The “active” button................................................................................................................12
The “VOL/SQL” button..........................................................................................................12
The MHZ/KHZ/CH button.....................................................................................................13
Selecting frequencies................................................................................................................14
The channel database...............................................................................................................14
Changing channels...............................................................................................................14
The RX/TX bargraph.................................................................................................................15
The menu system......................................................................................................................15
First level menu functions.....................................................................................................17
Ambient noise suppression..............................................................................................17
Program channels............................................................................................................18
Contrast............................................................................................................................18
Microphone level..............................................................................................................19
Microphone bandpass filter..............................................................................................19
PTT Mode.........................................................................................................................20
Auxiliary input level...........................................................................................................20
Scanning state on power up.............................................................................................20
Setup menu entry.............................................................................................................20
Second level menu functions................................................................................................21
Main + Standby / Main only / Standby only......................................................................21
Invert off / invert on...........................................................................................................21
TX MIC VOX / TX MIC HOT.............................................................................................22
TX LOCK ON / TX LOCK OFF.........................................................................................22
P-scan OFF / P-scan ON..................................................................................................22
Direct FS / Flip-Flop FS....................................................................................................22
1 MIC Level / 2 MIC Level................................................................................................22
COMM TX ON / OFF........................................................................................................23
Default..............................................................................................................................23
Frequency lists..........................................................................................................................24
Dual watch receiver operation..................................................................................................25
Dual scan receiver operation....................................................................................................26
Installation.................................................................................................................................27
General installation notes.....................................................................................................27
D-15 connector pin out.........................................................................................................28
Principal wiring diagrams......................................................................................................29
Using two V10 transceivers in a dual watch configuration (1)..............................................30
Using two V10 transceivers in a dual watch configuration (2)..............................................30
Normal single transceiver installation...................................................................................31
Dual transceiver installation..................................................................................................31
Other installation options......................................................................................................31
Connecting RS232 communication links..............................................................................32
Connecting a MGL Avionics NAV receiver.......................................................................32
Using an external intercom system......................................................................................32
RF feedback – cause and elimination..............................................................................32
Dimensions................................................................................................................................34
MGL Avionics V10 transceiver binary communications protocol..............................................35
Version..................................................................................................................................35
General.................................................................................................................................35
General message format:.................................................................................................35
Commands:......................................................................................................................36
Format of Acknowledge message (sent by transceiver)..................................................40
Format of status message (sent by transceiver every 120mS)........................................40
Specifications............................................................................................................................41
The V10 transceiver introduction
The V10 is a VHF Airband transceiver with a 6W carrier power transmitter enclosed in a 3.1/8”
standard aviation panel mount (front mount) of compact mounting depth and very light weight.
A generously dimensioned LCD display provides clear frequency and function information.
The receiver spans the frequency range from 108 to 136.975Mhz (includes NAV frequencies)
while the transmitter covers the COM frequency range from 118 to 136.975Mhz.
Up to 100 memory channels and 10 frequency lists are provided in addition to direct
frequency selection.
The V10 receiver is based on a commercial broadcast quality system in a dual
superheterodyne configuration with a high first IF stage. Audio is demodulated using a
synchronous demodulator resulting in very high receive audio quality.
The receiver can be operated as dual frequency scanning radio.
The transmitter is based on a PDMOS output stage using a class D fully digital modulator.
Modulation is entirely under microprocessor control allowing excellent carrier modulation
under all conditions. As a welcome side effect this results in a very power efficient transmitter.
A unique, fully digital PLL operating at around 5Ghz is used as highly stable and spectrally
very clean source as local oscillator and transmit frequency source. No frequency calibration
is required during the lifetime of the V10 to remain within required tolerances.
The V10 receiver and transmitter circuits contain zero adjustment points and no line-up
procedure is required either during manufacture or during service life.
All audio processing is done in software using a high performance microprocessor using
digital signal processing principles. Conversion from and to analog is done using a 18 bit
CODEC.
A two circuit digital intercom system is included configured as pilot and passenger system.
Several advanced intercom options are included, made possible by the software
implementation of the system. Two independent ambient noise suppression systems are
included, each can be adjusted for a wide range of applications.
The V10 user interface is specifically designed to be used under difficult conditions such as
found in open cockpit aircraft. Discarding common rotary knobs in favor of large, well spaced,
tactile buttons allows convenient operation of the V10 even with gloved hands.
The V10 further integrates very comprehensive digital communications links allowing remote
control and downloading of frequency databases.
The V10 Panel
Pressing this button
Press this button to exchanges active and
enter the menus. Here you standby frequency.
will find many adjustments Note: holding this button
and setups The current down enables further
standby functions
frequency
Increase
a value or
setting

The current Decrease

active a value or
frequency setting

Select volume or
Select MHZ, KHZ or channel to
squelch level to be
be changed. Hold down this
changed
button for 2 seconds to change
between MHZ/KHZ and Channel
Status bar showing volume or
mode. Hold down this button for
squelch level, voltage or transmitter
1 second when in MHZ/KHZ
temperature and active frequency
mode to change between 50
selection mode
and 25 KHZ tuning steps.

The above picture shows the V10 transceiver in its most typical application as “Flip-Flop”
frequency selection system. The V10 transceiver can be operated in other modes depending
on its setup and installation.

FLIP-FLOP mode
In this mode you change/edit the standby frequency while receive and transmit operate on the
active frequency. Active and standby frequencies may be interchanged using the “Active”
button.
Note: If scanning is enabled, it is also possible to receive on the standby frequency.

Direct frequency entry mode

In this mode, only the active frequency is shown. Standby frequency does not exist. All
changes/edits are done directly to the active frequency. No scanning is possible.

Dual watch system

A dual watch system can be formed using two V10 transceivers (see installation section).
This is similar to a single V10 operating in dual scan mode.

In effect, active and standby frequencies are spread over two transceivers making use of the
second receiver in the standby system.
The active system controls volume. The standby system controls its own squelch setting.
The dual watch system can be operated from either panel however each system retains its
own menu system.
Memory channels from the active system are used. Memory channels on the standby system
are not used. The standby systems transmitter is not used.
It is possible to connect a dual watch system in a fully redundant way. In this case either
system can be operated as a normal dual scan transceiver in case the other system is not
functional.
Frequency displays

Frequencies are displayed as 6 digit numbers. The first three digits show the MHZ part of the
frequency in the range of 108 to 136. The last three digits shows the KHZ part of the
frequency. In case of the European 8.33Khz channel spacing, the frequency may be shown
rounded to the nearest KHZ:
Examples:
122.008 = 122.00833 Khz
131.533 = 131.53333 Khz
118.292 = 118.29166 Khz

The status display

The bottom section of the display contains a variable content status.

Frequency entry mode:

50K tuning steps MHZ/KHZ
Current audio volume 25K tuning steps MHZ/KHZ
setting. Pressing the up/ CHL Channels
down arrow key will LST Frequency Lists
DC voltage level at
change the volume. supply input, alternates
with internal temperature
in degrees Celcius.

Pressing the VOL/SQL button will change between Volume and Squelch setting. If you press
the VOL/SQL button to return from squelch setting to volume setting, the squelch will briefly
open regardless of its setting (receiver static test).

V10 voltage and temperature monitoring

The V10 transceiver monitors the DC voltage at its supply terminals. The result of the voltage
measurement is used to set the output power of your transmitter and is also used to control
modulation of the transmit carrier to make optimal use of the available power.
A voltage below 11.0V will result in a “>LOW<' indication alternating with the voltage display.
Your V10 transceiver will be able to use the transmitter to below 10V. At 10V a useful 4W of
typical carrier power is available (low voltage emergency operation). Full power is achieved at
13.8V and higher input voltages while rated power is achieved at around 13V typically (varies
slightly between units and frequency tuned).
The V10 transceiver monitors the temperature of the transmitter power stage. The result of
this measurement is alternated with the voltage display. The V10 transceiver is designed to
prevent transmitter damage due to overheating caused by misuse, very badly matched
antennas or antenna cable wiring faults.
As a temperature of 70 degrees Celsius is reached power is gradually reduced, reaching a
minimum of about 4W carrier power if the temperature is higher than 95 degrees Celsius at
the transmitter power transistor.

Stuck PTT
The V10 transceiver is designed to automatically disconnect the PTT if the transmitter is
continuously keyed for more than 35 seconds. In this case the “>>>STUCK PTT<<<'
message will show on the display and the transmitter is switched off and the transceiver
returns to receiver mode.
If it was the intention to transmit for more than 35 seconds, simply let go of the PTT and key
again to start a new 35 second cycle. There is no limit to the number of 35 second cycles
allowed.

Transmit signal modulator

The V10 transmitter has a digital modulator that is directly under microprocessor control. The
audio signal to be transmitted is processed using digital signal processing algorithms before
being presented to the transmitter.
Software control of the modulator allows the system to control modulation under varying
power and temperature conditions. It also allows wide range control of the audio signal
strength (amplitude) to the modulator. This allows effective prevention of over modulation
while at the same time allowing deep and rich modulation of the carrier frequency. This results
in very good audio quality of the transmitted signal and consequent extension of effective
range of the transmitter.
The V10 menu structure
The V10 transceiver provides setups and adjustments on two menu levels. The first level is
accessed by pressing the “Menu” button. The second level contains setups that are typically
only used once, during installation. These are accessed via the first level menu “setup”
function.
Menu functions shown inside are only available if enabled or required data is present.

Select channels / lists (if any lists loaded)

VOX/VOGAD adjustments
Edit memory channels
Display contrast adjustment
Microphone levels (All or pilot if 2 levels enabled)
Microphone level passenger (if 2 levels enabled)
Auxiliary input level and mute adjustment
Microphone bandpass filter
Scanning power up state
PTT join or isolate
Enter second level setup menu

Single/dual type operating mode

TX audio phase reversal
TX HOT microphone or VOX/VOGAD
TX lock on RX enable
Priority scan on active enable
Flip-Flop or direct frequency mode
One or two microphone level adjustments
Set unit to factory default
The V10 buttons

The “menu” button

The menu button allows you to enter the menu system at any time. Here you will find access
to less often used functions such as setting intercom VOX or audio levels and other functions.
Via the menu system you can also enter the setup system where you can select many
operational options for the transceiver.

The “active” button

Pressing this button exchanges active and standby frequencies.
With a normal setup, you edit the standby frequency (change frequencies either by direct
entry or channel selection).
Note: It is possible to select the transceiver to operate in “direct frequency mode” in this mode
you will only see a single frequency on the display which is your active frequency. You can
directly change this frequency.
Note: Holding down this button for 1 second will activate the scanning system (both active
and standby frequencies are scanned rapidly for incoming transmissions). If the scanning is
enabled, this will disable the scanning. Scanning is indicated by a flashing “S” between the
active and standby heading:

You will hear a short burst of beeps when activating or deactivating the scanning so you do
not have to look at the display. You will get three beeps if the scanning has been enabled and
two beeps if it has been disabled.
Note: Holding down this button for 3 seconds will automatically set the active frequency to the
emergency broadcast channel on 121.5 Mhz.

The “VOL/SQL” button

The transceiver defaults to the volume bargraph display. In this mode pressing the up or down
arrow button will adjust the headset volume.
Pressing this button will change to the squelch bargraph and this will allow you to set the
desired squelch level.
Adjust the squelch level such that the static noise from the receiver is just squelched out.
Adjusting this too high may result in weaker transmissions not being received. Adjusting this
too low may result in static noise breaking though at times.
Note: This button is also used for a quick receiver check: Press the button to show the
squelch level and then press it again to return to the volume level. This will open the squelch
for about two seconds regardless of the squelch setting so you can verify receiver static
(which is a good indication that the receiver is working).
The MHZ/KHZ/CH button
Press this button to select to change the standby frequency or active frequency if direct
frequency mode is being used.
The V10 transceiver operates either in MHZ/KHZ or channel entry mode.
Holding the MHZ/KHZ/CH button down for two seconds changes the entry mode.
Transceiver is in channel entery
mode. Pressing MHZ/KHZ/CH
will allow you to change channels

Pressing the up/down arrow

buttons will change channel
number 1's

Pressing the up/down arrow

buttons will change channel
number 10's
In MHZ/KHZ mode you use the MHZ/KHZ/CH button to change entry between MHZ or KHZ.
In Channel mode you use the MHZ/KHZ/CH button to change either channel number 10's or
channel number 1's.
When in either of the above two entry modes (channel 1's or channel 10's), pressing the
MHZ/KHZ/CH button briefly will flip the entry mode between 1's and 10's.
Pressing and holding down the MHZ/KHZ/CH button for one second will change the entry
mode to MHZ/KHZ.

Pressing the up/down Pressing and holding the

arrow buttons will MHZ/KHZ/CH button for one
change the MHZ of the second will change to 25KHZ
frequency being tuning steps (8.33KHZ for
entered. Pressing European models).
MHZ/KHZ/CH will
change to KHZ entry.

Pressing the up/down Pressing and holding the

buttons will change the MHZ/KHZ/CH button for one
KHZ of the frequency being second will change to 50KHZ
entered. tuning steps.
Pressing MHZ/KHZ/CH will
change to MHZ entry.
Selecting frequencies
Regardless of “direct frequency” or “flip/flop frequency” mode, setting a frequency is done by
pressing the MHZ/KHZ/CH button until the desired entry you want to change is flashing on the
display: Example “set MHZ”:

While the desired entry is flashing, you can change the number using the up and down arrow
buttons.
Note: KHZ rolls over without changing the MHZ value. If 50 Khz steps are used, pressing the
up arrow button will change from a frequency display of 124.95 to 124.00. 124.00 with
pressing the down button will change to 124.95. This may be used to speed up KHZ
selection.

The channel database

The V10 transceiver contains up to 100 user programmable frequencies, each with name and
function designator using alpha numeric characters.
In addition, a further 10 frequency lists are provided with 20 frequencies each. These may be
set remotely if the system is connected to an EFIS or compatible GPS. Typically, each of
these databases would contain frequencies related to an airport and each of these databases
is identified by the name of the airport. These databases are loaded at runtime from a
compatible EFIS and are lost if power is removed.
If at least one database is loaded, it can be selected as first menu item. If selected it will
replace the internal 100 channel database until it is deselected using the same menu function.
Note that this functionality is available only if the EFIS/GPS uses Garmin SL30 or SL40
communications. MGL Avionics EFIS systems do not use this function as the frequency
selection has moved to the EFIS itself.

Changing channels
Press the MHZ/KHZ/CH button until the word “Channel” appears as shown below. Then you
can select channels using the up and down arrow buttons.
Note: The channel selection will roll over from 100 to 1 or from 1 to 100.
Note: If Airport frequency lists have been uploaded from a compatible EFIS and such a list
has been activated by menu function, only 20 channels will be selectable from the currently
active list (the list size is determined by the SL30 and SL40 communications protocol from 1
to 20 entries).
The RX/TX bargraph
The V10 transceiver contains a bargraph in its main display that during RX shows the relative
signal strength of a received transmission. Due to the good receiver sensitivity signals of
medium strength will be able to fill the bargraph.
During TX the bargraph shows your voice modulation of the actual transmit carrier. In effect
this is a visual side tone. Using this you have a tool to judge how well the signal from your
microphone is modulating the carrier. Note that this bargraph does not just show you the level
from your microphone – this is the actual signal that is being transmitted.
A good modulation will cause the bargraph to just touch the right hand side of the display for
the loudest part of your transmission, often this is achived with click (“T”) or “SHH” voice
sounds. The normal parts of your voice during transmission would show up around 50%
modulation level.
The modulation level should be adjusted using the microphone level adjustment in the menu.
If you change headsets to another type, check the microphone level first before you use it.
The microphone level adjustment menu function has a very convenient readout of your level
making adjustment easy and precise.

Receiving transmission of moderate strength

Transmitting with good modulation at louder parts of voice

The menu system

Entering the menu system is done by pressing the “Menu” button.
The menu consists of a two level system. Common use selections and setups are
concentrated in a first level menu system while rarely used setups are found under the “setup”
menu which is accessible as a first level menu item.
 To return to normal
operating mode press
the menu button Press this button if you
would like to
change/edit/select the
current menu item

Press the up and

down arrow buttons
to select the desired
menu function

Once a menu function has been selected, it will change

according to the functionality provided.
As an example, here the ambient noise suppression system
has been selected and you can select both the type of system
to use and set sound/noise levels as required.
First level menu functions
This chapter describes the various first level menu functions provided in the V10 transceiver.

Ambient noise suppression

Your V10 transceiver provides four different ambient noise suppression systems. These can
be selected using the “Type” selection.
The up and down arrow buttons can be used to select the strength or effectiveness of the
selected system.
● VOGAD system
The VOGAD system is a propriety system developed by MGL Avionics. This system
uses gain shaping using digital audio processing. Here the voice strength envelope is
detected and used to modulate the gain of the microphone amplification system. A
level setting of 1 is suitable for most applications. Three further levels are provided with
different characteristics. The system should be selected such that ambient noise is
sufficiently suppressed while voice comes through loud and clear. It is important to set
your microphone gain not too high to allow correct match of the microphone level to the
system. A high level of gain may allow noise to pass the threshold.
A correctly setup VOGAD system will cause your microphone to become very
directional so it needs to be placed directly in front of your mouth.
● VOX system
This system simply switches your microphone off if the level of sound received by the
microphone is below a preset level. The switching is done in a digitally controlled “soft”
manner so no clicks are audible.
Adjust the level such that ambient noise is just less than what is needed to open the
microphone. If the level is set too high, you may find that parts of your first syllable are
not sufficient to open the microphone.
Program channels

This function, if selected will enter the memory channel

programming system.
Memory channels can be programmed using this function or
they can be downloaded from a PC using the provided
software.

The V10 provides 100 channels for pre-programmed

frequencies. Each channel contains frequency, name of the
frequency (for example airport name) and type of the
frequency (for example “Tower”).
Name and type can be up to 6 characters long.

Use the active/standby button to move the highlight (inverted part of the display) to the
desired line for editing.
Channel selected:
Use the up and down arrow buttons to select the channel to edit.
Frequency selected:
Use the MHZ/KHZ/CH key to select change of MHZ or KHZ (the MHZ or KHZ part will flash to
indicate which is selected.
Use the up and down arrow buttons to edit the frequency.
Holding down the MHZ/KHZ/CH button for 1 second will switch between 25 and 50 Khz steps.
Name or Type selected:
Use the MHZ/KHZ/CH button to select the character position to edit.
Use the up and down arrow button to change the character.
Press the “Menu” button to return to the menu when you are finished editing channels.

Contrast

Adjust the display contrast. A value of between 30 and 40 is

suitable for most environments. A lower value results in a
lighter display while a higher value results in a darker display.
Adjust the contrast such that dark areas are fully saturated
while light areas do not show any darkening.
Microphone level

This function allows you to adjust your microphone level. A

bargraph is provided so you can adjust to the correct level.
The correct level is achieved if most of the time, while you are
speaking normally into the microphone, the bargraph remains
between about ½ to ¾ of the range with excursions all the way
to the right only during very loud parts of your voice or “click”
sounds.
Please note: The level shown is that of the Pilot microphone input. No level is shown for
signals received from the passenger microphone.
This adjustment sets both the pilot as well as the passenger microphone amplifier gain levels.
Correct adjustment of this level is important. It influences correct operation of the ambient
noise suppression systems and also influences correct modulation levels of your transmitter.
Note: By design your transmitter cannot be over-modulated if levels are set too high, however,
sound quality may suffer.
Using independent level settings for pilot and passenger microphone circuits:
The second level menu system contains a setting to enable independent level adjustments for
pilot and passenger microphone circuits.
If enabled, two level adjustments are made available:

Microphone bandpass filter

For operation with high ambient noise levels an additional
voice bandpass filter can be engaged for both pilot and
passenger microphone circuits.
This can help reduce the effects of unwanted noise, in
particular at very low and very high frequencies. This filter has
a sharp cutoff for frequencies below 500 Hz and above
2.4KHz.
PTT Mode
The V10 transceiver has two PTT inputs, one for the pilot
circuit and one for the passenger circuit (PAX).
You can select to join or isolate the PTT and micrphones
during transmit.
If you have selected “Join”, both microphone circuits are active
during transmit regardless of which PTT is activated.
If you have selected “Isolate”, only the microphone circuit
related to its PTT will be allowed if the PTT is active – the other microphone will be muted.

Auxiliary input level

You can connect an EFIS voice alert or other sound system
(music) to the auxiliary inputs of your V10.
You can choose two levels:
Open: This level is applied if no sound is received from your
microphones.
Mute: This level is applied if sound is received on either of
your microphone circuits.
Depending on the setting, you can select the same level (external sound remains unchanged
if you speak into the microphone), differing levels (external sound fades to a lower level if you
speak into the microphone) or you can select that the external sound is completely muted if
you speak into the microphone.
The external sound level is not switched between these two levels but is faded between these
levels (slow, pleasant fading in and out of the external sound).

Scanning state on power up

Select if you would like your V10 transceiver to power up with
scanning enabled or disabled.
Scanning is only applicable if you are operating a single
system in active/standby mode and direct frequency entry is
disabled.
Scanning will continuously check active and standby
frequencies for reception.

Setup menu entry

Select the secondary setup menu for basic setups and
operational options. In this menu you will find setups that are
only rarely used, usually only when you first install your
transceiver.
Secondary setup menu options are listed in the next chapter.
Second level menu functions
This chapter describes the various second level menu functions provided in the V10
transceiver.
The second level menu is accessible via the first level menu “Setup” selection.

Use the up/down buttons to

select the desired function to
change and then press the
“active” key to select your
option.

Main + Standby / Main only / Standby only

Select the basic operation mode for this transceiver. If you have a single transceiver or a dual
transceiver that are completely independent, select “Main+Standby”.
If you are using a dual transceiver setup interconnected via the airtalk link, select one
transceiver to be your “main” unit and the other to be the “standby” unit.
In this configuration using two transceivers, you have full dual watch operation (as opposed to
dual scan with a single transceiver). With this system, operation is similar to a single
transceiver operating in active/standby mode except that active and standby are spread over
two transceivers. In effect you are using the standby transceivers receiver only to create a
single dual watch system.
It is also possible to install your two systems in such a way that they can each be used as full
function systems in case one of your transceivers becomes nonoperational.

Invert off / invert on

This function allows you to invert the phase of your microphones by 180 degrees. This can be
useful if your setup is suffering from RF feedback issues. In this case, during transmission,
RF from your antenna may be injected into your microphones, wiring or additional audio
panels or external intercom systems and partly demodulated due to non-linearities in the
audio inputs. This is somewhat similar to audio feedback that may occur on stage with a
microphone and sound system.
Inverting the phase is not a real fix for this, (this should be corrected by proper installation) –
however it is a useful feature nevertheless that can help, in particular if you are using an
external intercom system or audio panel and the phase relationship is not known.

TX MIC VOX / TX MIC HOT

Select if during transmission you would like the noise ambient noise suppression system to
remain active or if you want the microphone to be “hot”, i.e. continuously active during the
time of transmission.
If you are using the VOGAD system, we recommend to set this to “TX MIC VOX”. If you are
using the traditional VOX system, we recommend to set this to “TX MIC HOT”.

TX LOCK ON / TX LOCK OFF

Select if you would like the transceiver to prevent transmission if it is currently receiving on
the active frequency.
Select “LOCK ON” if the PTT should be disabled if there is a current reception on the active
frequency that is above the current squelch level in signal strength.

P-scan OFF / P-scan ON

Select if you would like to enable the priority scan feature.
This is applicable only to systems set to “main/standby” mode with direct frequency selection
off.
If you have scanning enabled (enable/disable by holding the active button down for 1
second), and you are currently receiving on the standby channel, the reception will break for
short intervals to allow the system to check the active channel for a signal. If a signal is found
o the active channel, reception on the standby channel is canceled and the active channel is
received. Once reception on the active channel terminates, scanning continuous.

Direct FS / Flip-Flop FS
Select if you would like to use direct frequency selection or the normal active/standby “flip-
flop” frequency selection system.
This setup is only applicable if you are using the transceiver in “main/standby” mode.
With direct frequency selection you change the frequency of the active channel and no
standby channel exists. Also there is no scanning.

1 MIC Level / 2 MIC Level

Select “2 MIC Level” if you need independent level controls for pilot and passenger
microphone circuits.
COMM TX ON / OFF
If you are using a dual radio setup or are using a remote head or other remote function to
control the radio you need to select this function to “on”. This will enable continuous
transmission of the radios status on both RS232 serial interfaces as well as the airtalk
interface. This function is “off” as a default.
There is a possibility of slight microphone interference related to the transmission of digital
data if installation is not optimum or you have unterminated (open) audio inputs such as the
auxiliary input or insufficiently shielded microphone cables. If you do not have a need for the
transmission of the radio status data, we recommend that you set this function to “off”.
Please note that with this function set to “off” remote control of your V10 radio to set
frequencies from a connected EFIS system is still possible.

Default
This function ask for confirmation before reseting all settings to factory default.
Items NOT affected are:
a) Memory channels
b) Current active and standby frequencies
Frequency lists
If you have your transceiver connected to a Garmin SL30 or SL40 compatible frequency
source (such as an EFIS or aviation GPS), it may be possible for these devices to upload
frequency lists to your transceiver.
The Garmin frequency list system consists of up to 10 lists with up to 20 frequencies each.
Each list is normally used to contain the frequencies for one airport. Each frequency is
marked by function (such as tower, ground, etc).
Each list is identified by a four character identifier.

If at least one list containing at least one frequency has been uploaded to your V10
transceiver, you will be presented with a new menu entry (first level menu).This menu function
allows you to select either the normal 100 channel memory to be used for channel selection
or you can select from any of the uploaded frequency lists. For example the next picture
shows the selection for a list called “KLAX”, Los Angeles International.

Select either “Channels” to use the normal 100 channel memory or select one of the uploaded
lists as you require.
List frequencies can be selected in the same way that you would access normal channels.
Each frequency will be displayed with the list name and frequency function.
Note: If you switch your V10 transceiver off, uploaded frequency lists are cleared. Your
frequency source (EFIS, GPS) needs to upload the lists again after you switch on your V10
transceiver.
Note: MGL Avionics EFIS systems do not use frequency lists. This functionality has moved
into the EFIS and direct frequency selection via the EFIS is used.
Dual watch receiver operation
Dual watch configuration requires two V10 transceivers wired in one of the two possible
methods shown in the installation section of this manual (simple or redundant system).
One V10 is configured as active frequency system while the other system is configured as
standby system. In principle, the two V10 transceivers operate very similar to a single V10
configured as active/standby system but rather than using a dual scan system, a dual watch
system is possible as a second receiver is available.
The standby system never transmits.

● Volume is set on the active system

● Both transceivers have their own squelch level settings
● Frequency is changed on the standby system
● Direct frequency entry is not available in this mode
● ACTIVE, MHZ,KHZ,CH and UP/DOWN buttons function interchangeably on both
systems
● Auxiliary audio is fed to the standby system and is routed to the active system if no
reception on the standby system is present
● Standby volume setting and active auxiliary level settings are fixed and cannot be
changed
● Reception on the active frequency always has priority
Dual scan receiver operation
A single V10 transceiver can operate in dual scan mode. In this mode the receiver rapidly
scans between active and standby frequencies. If either frequency contains a signal greater
than the squelch level, scanning stops and the receiver locks onto this frequency. Once
reception is terminated, scanning resumes.
Scanning is enabled or disabled by holding the ACTIVE button down for one second (holding
this button for three seconds will set the active frequency to the 121.5Mhz emergency
frequency.
Scanning is indicated by a flashing “S” in the header bar.

Scanning may be performed either in priority or non-priority mode. You select this in the
second level menu. In non-priority mode active and standby frequencies have equal priority
and reception will be handled on a first come, first serve bases.
In priority mode, if reception is on the standby frequency, the reception will briefly interrupt for
a very short interval once every second to allow the radio to check the active frequency for
reception. If the active frequency is receiving a signal above the squelch threshold, reception
switches to the active channel unconditionally.
A further, related setup exists in the first level setup menu. Here you can select if scanning
should be enabled when power is applied to the V10.
Installation
This chapter describes the various installation options for the V10 transceiver.

General installation notes

Installation should be performed by a qualified aircraft electronics technician.
All soldering using acceptable electronic fluxed solder wire. Solder joints are required to be of
high quality to acceptable standards.
All wiring external to the V10 transceiver to conform to relevant aircraft standards. Flame
proof or flame retardant insulation to be used on all wiring.
Installations must conform to regulations in force in your country.
It is recommended that shielded audio cables are used for all audio signal connections. Using
unshielded cables may result in interference.
It is recommended to use shielded cables for all digital communications links to prevent
interference.
Choose suitable power cable of sufficient diameter to carry the maximum expected current to
the V10 transceiver (1.5A maximum).
It is mandatory to install a 2.5A-5A slow blow fuse or equivalent circuit breaker in line to the
supply of the V10 transceiver.
Never share power to a RF device with sensitive equipment such as GPS receivers and EFIS
systems. Do route separate grounds and power supply rails to the V10 transceiver.
RF cable must be good quality RG58 or equivalent cable. Choose a low loss cable if you
need a long connection to your antenna.
Ensure that the antenna cable has a correctly fitted BNC connector. Ensure in particular that
no short exists either inside the BNC connector or at the antenna side of the cable. A shorted
cable may result in poor performance and may damage your transmitter.
Never route your antenna cable in a bundle with other wires. Never bend your antenna cable
sharply as this degrades its function as transmission line at that point.
After installation verify proper operation of the V10 transmitter using a suitable RF power
meter with SWR readout. Ensure that the antenna is well matched and is able to radiate the
available RF power generated by the V10. Reflected power due to poor antenna match or
termination enters your aircraft ground system and may cause interference with other
systems.
Before operating the V10 transceivers transmitter, ensure that microphones are operational
and levels have been setup correctly (first level menu – microphone level setup).
If using microphone and headphone sockets – do not connect the metal body of these
sockets to airframe or other grounds via a metal mounting surface as this can result in
microphone and audio interference. Ensure that all electrical connections of the
sockets remain isolated !
D-15 connector pin out
The V10 transceiver provides all low frequency signal and power connections on a female
D-15 connector.

All audio connections use a common audio ground. Do not connect the audio ground to
supply ground or aircraft grounds as this may introduce interference.
Power requirement is a clean DC supply of 12V to 24V nominal. DC voltage may not exceed
28V.
A single audio output is provided able to drive a 8 ohm speaker or up to 20 standard aviation
600 ohm headsets.
A two circuit intercom circuit is provided. One circuit is intended as pilot circuit and the second
circuit is intended as passenger circuit. It is permissible to connect several microphones to
each circuit in parallel. In this case it is recommended that identical headsets are used.
Two audio grounds are provided. It is recommended to use one for microphone grounds /
auxiliary input ground and the other for headset ground.
Two PTT inputs are provided. To activate a PTT, connect the PTT input to power supply
ground or audio ground. Airframe ground may also be acceptable.
One auxiliary audio input is provided. The input can be used to connect to a music source
(CD or MP3 player) or EFIS voice alert. It is possible to connect two sources by coupling
these to the single input using 4K7 (4700) ohm resistors in each feed, joining at the auxiliary
input.
Two independent RS232 serial communications ports are provided. These are used to
connect to two independent EFIS systems for remote control of the V10 transceiver. These
ports are equivalent and are interchangeable.
One airtalk LAN communications link is provided. This is used to interconnect two V10
transceivers to form a single dual watch system.
Principal wiring diagrams

Use this diagram to wire headsets that provide built in

PTT buttons.
Please note use of shielded audio cable

Use this diagram if you plan on using independent PTT

switches. Here both pilot and passenger PTT are shown.
The passenger PTT is optional.
Please note use of shielded audio cable. It is
recommended to use shielded cable on PTT as well, in
particular if long cables are needed.

This diagram shows power and communications links.

Communications links are optional.
It is recommended to use shielded cables for RS232 links.
A 2.5A – 5A circuit breaker or fuse must be installed. This is
mandatory.

This diagram shows connection of the auxiliary audio input.

Using two V10 transceivers in a dual watch configuration (1)

Using two V10 transceivers in a dual watch configuration (2)

Normal single transceiver installation
This installation is used if you have a single V10 transceiver and will be operating in
Main/Standby mode (set this in the secondary setup menu).
This is the normal mode of operation for most installations.
You need to connect the following:
● Supply voltage (typically 12V) positive
● Supply ground (negative)
● Pilot microphone and headset
● Pilot PTT contact
● 50 ohm antenna tuned to the VHF airband via 50 ohm RG58 or equivalent cable
In addition you may connect the following optional items:
● Passenger microphone and headset
● Passenger PTT contact
● One or two auxiliary audio sources (or one stereo source)
● One or two RS232 connections to EFIS systems (if used)

Dual transceiver installation

Two V10 transceivers may be connected to each other using the airtalk connection.
Using this, one receiver is set to “main only” while the other is set to “standby only”. These
modes are selected in the secondary setup menu.
The standby system is used as a receiver only. It is possible to connect headsets in parallel
with the main system as well as parallel connection of the PTT inputs. In this case it becomes
possible to use the standby system as a redundant transceiver should the main system fail for
any reason.
Using a system in this manner allows the creation of a full dual watch system (as opposed to
the dual scan system possible with a single transceiver). Two frequencies are monitored. The
audio signal from the standby system is routed to the main system “auxiliary input”. Any
auxiliary audio sources (music etc) are connected to the standby system and these signals
are routed through to the main system if no RX is taking place on the standby system.
The dual transceiver installation can be done either in a simple mode requiring minimal wiring
or it can be wired as a fully redundant system. In the latter case, it becomes necessary to be
able to switch a few signal wires using a panel mount multi-pole switch to switch between
normal operation and redundant operation for the standby system.

Other installation options

If you are using a suitable audio panel and two V10 transceivers, you can wire these
independently to the audio panel. In this case you can operate each radio either using direct
frequency selection or flip-flop frequency selection as you require (select this operating mode
in the secondary setup menu).
Connecting RS232 communication links
The V10 transceiver provides two RS232 communication links, each with a TX and RX line.
Each of the two RS232 links operates independent from the other using the same
communication protocols. This allows connection of the V10 two two independent EFIS
systems for full redundancy.
Connect the TX line of the V10 to the RX line of the EFIS and the RX line of the V10 to the TX
line of the EFIS. Usage of shielded cables is recommended. Connect the shield to either the
ground of the EFIS or the ground of the V10. Do not connect both as this may create a
ground loop. EFIS and V10 should share ground at the same potential (typically both have
grounds wired to a common distribution point or the negative of the battery.

Connecting a MGL Avionics NAV receiver

Should you be using a MGL Avionics NAV receiver (VOR, ILS and glideslope), connect the TX
lines of both the V10 and the NAV receiver together. Also connect the RX lines in similar
fashion.
Connecting two TX lines together is not normally done with RS232 communications, however
your V10 transceiver and the MGL NAV receiver have special provision for this.
If wired together in this fashion, the two systems behave compatible to a Garmin SL30
NAV/COM system.
The MGL Avionics NAV radio also has two RS232 links and you can join both in this fashion
to the V10 radio and then to the EFIS system(s).

Using an external intercom system

If you are using an external intercom system that provides its own VOX or ambient noise
suppression system, it may be required to switch the built in VOX or VOGAD system off. You
switch this off by setting the level of the chosen system to zero (value displayed: OFF). You
select this in the first level menu system.
You may also need to experiment with the signal phase inversion function (second level menu
system) if you are experiencing RF feedback issues.

RF feedback – cause and elimination

RF feedback is a phenomena very similar to microphone feedback on a sound stage. The
modulated RF signal during transmission is received by your microphones or microphone
cables and routed to the input of your intercom system or V10 transceiver.
Here, some of the modulated signal may be demodulated by non-linearities in the system,
particularly if the received RF is very strong (typically several volts).
This creates a common feedback loop that in a mild form will create an echo similar to
“bathroom sound” and in severer cases will cause squealing or other undesirable effects.
On of the most common causes for this is missing microphone cable shields due to broken
wires or poor quality or unsuitable microphone cables.
Sometimes very close proximity of the transmitting antenna to headsets or other aircraft
wiring may be the cause, often with more powerful transmitters like you find in the V10.
In difficult cases, use of ferrites placed at strategic locations over your microphone and
headset cables may help block RF from traveling on these cables. Ensure you use ferrites
made to operate in the 100-150Mhz frequency band for this to be effective.
Never route your antenna cable inside a bundle with other wires in your aircraft. Keep your
antenna cable well separated from all other cables.
Dimensions
MGL Avionics V10 transceiver binary communications protocol

Version
This document contains preliminary information on the binary communications protocol used
by MGL Avionics VHF airband transceivers. It is applicable to panel mount as well as remote
units that are controlled via passive panels or EFIS systems.

MGL Avionics does not guarantee correctness of this document. MGL Avionics reserves the
right to change any part of the specification at any time.
Please contact MGL Avionics for a current copy of this specification if you intend using it for
your project.

General
Communications takes place via RS232.

9600 Baud
8 Data bits
1 Stop bit
No parity

The transceiver transmits regular status messages containing sufficient information to build a
typical display image. The status message is transmitted every 120mS.
Messages to the transceiver consist of commands. Most commands result in transmission of
an acknowledgment when the command has been received with a matching checksum.
Exceptions to this are the PTT command (no response) and the request channel command
which responds with channel data.
PTT command has to be sent every 100 mS to keep PTT active.

Command messages containing frequencies that are not within the permitted airband are
ignored and not acknowledged.

Most MGL radios have two RS232 communication links. Both links accept the same protocol
and messages may be sent simultaneously via both links. This allows a redundant
communications link to be established via two EFIS systems. It is recommended that only one
EFIS system controls the transceiver while the other will take control in case the first one has
a failure.

Note: The RS232 links also accept parts of the Garmin SL30 and SL40 communications
protocols. Functions supported are frequency lists and direct selection of active and standby
frequencies. Please view Garmin documentation on message formats. Garmin messages
may be used at any time and may be interspaced by MGL binary protocol.

General message format:

$02 STX
$05 DLE
CC Command
D0 1 to n bytes of data
...
Dn
CKS Checksum

Checksum is a linear XOR of the message contents from Command to the last data byte.
The result of this is XOR'ed with the value of $55

Commands:

$00 Set active frequency

D0 Frequency in Khz, binary, LSB first
.... Sets frequency is TX is not active, if active will cause change of frequency
D3 to new value when TX ends.

Note: Frequency must be a valid frequency in the range of 108.000 Mhz and 136.975Mhz.
Frequency must be dividable by 25. Invalid frequencies will be ignored and no acknowledge
will be sent for the message.

Sends acknowledge when message received OK

$01 Set standby frequency

D0 Frequency in Khz, binary, LSB first
....
D3

Note: Frequency must be a valid frequency in the range of 108.000 Mhz and 136.975Mhz.
Frequency must be dividable by 25. Invalid frequencies will be ignored and no acknowledge
will be sent for the message.

Sends acknowledge when message received OK

$02 Increase volume (typical 1.5dB)

D0 Don't care data value (recommend to set to zero)

Sends acknowledge when message received OK

$03 Decrease volume (typical 1.5dB)

D0 Don't care data value (recommend to set to zero)

Sends acknowledge when message received OK

$04 Set volume

D0 Volume value 0-31 (lowest to highest)

Sends acknowledge when message received OK

$05 Increase squelch
D0 Don't care data value (recommend to set to zero)

Sends acknowledge when message received OK

$06 Decrease squelch

D0 Don't care data value (recommend to set to zero)

Sends acknowledge when message received OK

$07 Set squelch

D0 Squelch value 0-31 (lowest to highest)

Sends acknowledge when message received OK

$08 Set scanning on/off

D0 0 = scanning off
1 = scanning on
This message has an effect only if a single transceiver set to operate in
main/standby mode is used.

Sends acknowledge when message received OK

$09 Program channel

D0 Frequency in Khz, binary, LSB first
.... Sets frequency is TX is not active, if active will cause change of frequency
D3 to new value when TX ends.
N0 Frequency name. Six ASCII characters, pad with space
....
N5
F0 Frequency function. Six ASCII characters, pad with space
....
F5
C0 Channel to program, 0-99 (channel 1-100)

Sends acknowledge when programming complete

$10 Request channel data

D0 Channel number 0-99 (channel 1-100)

Responds with channel data message:

$02 $05 $01 D0 D1 D2 D3 $06 N0 N1 N2 N3 N4 N5 $06 F0 F1 F2 F3 F4 F5 XX XX CKS

D1-D4 = Frequency in Khz

N1-N5 = Frequency name
F0-F5 = Frequency function
XX = don't care

$11 PTT
D0 Bit 0 = Pilot PTT. 1=active, 0=not active
Bit 1 = PAX PTT. 1-active, 0=not active

This message must be sent every 100 mS to keep a PTT active. It will timeout and cancel any
active PTT after 400mS if no further PTT command is received.
When the PTT is to be released it is recommended that at least one message is sent with the
corresponding PTT bit set to zero so the TX is released immediately.
There is no need to send this message when no PTT is active.

This command does not reply with an acknowledge message

$12 Increment channel and set active frequency

D0 Don't care (recommend to set to zero)

This function will set the active frequency to that stored in the next channel. If channel 100 is
exceeded will wrap to channel 1.

Sends acknowledge when message received OK

$13 Decrement channel and set active frequency

D0 Don't care (recommend to set to zero)

This function will set the active frequency to that stored in the previous channel. If channel 1
is exceeded will wrap to channel 100.

Sends acknowledge when message received OK

$14 Set channel and set active frequency

D0 Channel number 0-99 (channel 1-100)

This function will set the active frequency to that stored in the requested channel.

Sends acknowledge when message received OK

$15 Increment channel and set standby frequency

D0 Don't care (recommend to set to zero)

This function will set the standby frequency to that stored in the next channel. If channel 100
is exceeded will wrap to channel 1.

Sends acknowledge when message received OK

$16 Decrement channel and set standby frequency

D0 Don't care (recommend to set to zero)
This function will set the standby frequency to that stored in the previous channel. If channel 1
is exceeded will wrap to channel 100.

Sends acknowledge when message received OK

$17 Set channel and set standby frequency

D0 Channel number 0-99 (channel 1-100)

This function will set the standby frequency to that stored in the requested channel.

Sends acknowledge when message received OK

$18 Flip active and standby frequencies

D0 Don't care (recommend to set to zero)

Sends acknowledge when message received OK

$19 Remote control

D0 Command
This message enables simple remote control using a one byte command. This message does
not result in an acknowledge.
Command
0- Increment active frequency MHZ (will wrap)
1- Decrement active frequency MHZ (will wrap)
2- Increment active frequency KHZ (wraps within current MHZ)
3- Decrement active frequency KHZ (wraps within current MHZ)
4- Increment standby frequency MHZ (will wrap)
5- Decrement standby frequency MHZ (will wrap)
6- Increment standby frequency KHZ (wraps within current MHZ)
7- Decrement standby frequency KHZ (wraps within current MHZ)
8- Increment active channel (wraps (Lists do not wrap))
9- Increment active channel 10's (wraps (Lists do not wrap))
10 - Decrement active channel (wraps (Lists do not wrap))
11 - Decrement active channel 10's (wraps (Lists do not wrap))
12 - Swap active/standby frequency
13 - Volume up
14 - Volume down
15 - Squelch up
16 - Squelch down
17 - Increment KHZ 100's active (wraps within current MHZ)
18 - Decrement KHZ 100's active (wraps within current MHZ)
19 - Increment KHZ 100's standby (wraps within current MHZ)
20 - Decrement KHZ 100's standby (wraps within current MHZ)
21 - Press Menu key
22 - Press Active key
23 - Press Up key
24 - Press down key
25 - Press MHZ/KHZ/CH key
26 - Press VOL/SQL key

Format of Acknowledge message (sent by transceiver)

$02 $05 $06 $53 (full message including checksum)

Format of status message (sent by transceiver every 120mS)

$02 STX
$05 DLE
$00 Message type
F1 Flags
Bit 0 – 1 =TX is active
Bit 1 – 1 =Scanning is active
Bit 2 – 1 =RX on active frequency
Bit 3 – 1 =RX on standby frequency
D0 Current volume 0-31
D1 Current squelch 0-31
A0 Active frequency in Khz
....
A3
A0 Standby frequency in Khz
....
A3
C0 Active channel 1-100 (0 if current frequency not in channel database)
C1 Standby channel 1-100 (0 if current frequency not in channel database)
L0 Active RX level 0-63 (for bargraph display)
L1 Standby RX level 0-63 (for bargraph display)
T0 TX modulation level 0-63 (for bargraph display)
N0 Active frequency name (6 characters padded with space)
....
N5
F0 Active frequency function (6 characters, padded with space)
....
F5
N0 Standby frequency name (6 characters padded with space)
....
N5
F0 Standby frequency function (6 characters, padded with space)
....
F5
CKS Checksum
Specifications
VHF air band transceiver based on ARM7 processor with digital audio CODEC and audio
signal processing in firmware. Conventional receiver with band input filter and high IP3 mixer.
Transmitter with digital modulator. Frequency reference high stability fully digital PLL (DPLL)
operating at 5GHZ.
Frequency range RX: 108.000-117.975MHZ (117.991MHZ Europe)
Frequency range TX: 118.000-136.975MHZ (136.991MHZ Europe)
Mode: AM (6K00A3E)
Output power TX: 6W at 13.0V (nominal specified power rating)
5.5W at 12.0V
4W at 10V (low voltage operation)
Max power 6W-7W at 13.8V and higher
Power output may vary +/-10% from nominal over the band
including spread between transceivers.
Power measured at the output connector into a 50 ohm
resistive load with unmodulated carrier.
Tuning steps: 1MHZ, 50KHZ, 25KHZ (8.33KHZ Europe)
Channels: 100 + 10 x 20 SL30/SL40 compatible frequency lists
Antenna impedance: 50 ohm
Receiver: Double conversion superheterodyne
1st IF 45MHZ 2nd IF 455KHZ
Transmitter: PDMOS output stage with class D digital modulator
Sensitivity: 2uV for 6dB S/N 1Khz 30% modulation
Spurious rejection: -70 dB
Transmission out of band: less than -60 dB
Audio output power: 0.5W into 8Ohm, 600Ohm compatible (up to 8 headsets)
Microphone: Electret with bias supplied by transceiver
Intercom: Two circuit with independent ambient noise suppression
a) Traditional VOX with selectable level and fading mute
b) MGL Avionics propriety digital VOGAD system

Audio subsystem: Fully digital with 18bit CODEC, 12Khz sampling rate.
Digital IIR filter technology throughout system.
COM: 2 x redundant RS232, Garmin SL30/SL40 compatible
MGL EFIS compatible, full remote control
1 x airtalk link for dual system operation
Power supply: 10 to 28V DC, 1.5A during TX. 250 mA during RX.
13.0V is nominal voltage to achieve rated TX power into a
matched 50 ohm antenna load.
Negative ground.
Temperature range: -20 degrees C to +55 degrees C
Weight: 250 grams