TEX100

TEX100/S

User Manual
Volume 1

Manufactured by Italy
File Name: CAPITOLI_EN.p65
Version: 4.0
Date: 18/07/2003

Document History

Date Version Reason Author

30/01/02 1.0 First electronic version M. Morotti
New format in 2 volumes
01/07/03 4.0 D. Canazza
New Main card

TEX100 - User Manual

Version 4.0

© Copyright 1993-2003
R.V.R. Elettronica SpA
Via del Fonditore 2/2c - 40138 - Bologna (Italia)
Telefono: +39 051 6010506
Fax: +39 051 6011104
Email: info@rvr.it
Web: www.rvr.it

All rights reserved

Printed and bound in Italy. No part of this manual may be reproduced,
memorized or transmitted in any form or by any means, eletronic or
mechanic, including photocopying, recording or by any information
storage and retrieval system, without the permission of the copyright
owner.
Notification of intended purpose and limitations of product use
This product is a FM transmitter intended for FM audio broadcasting. It utilises
operating frequencies not harmonised in the intended countries of use.
The user must obtain a license before using the product in intended country of
use. Ensure respective country licensing requirements are complied with.
Limitations of use can apply in respect of operating freuency, transmitter power
and/or channel spacing.

Declaration of Conformity
Hereby, R.V.R. Elettronica SpA, declares that this FM transmitter is in
compliance with the essential requirements and other relevant provisions of
Directive 1999/5/EC.
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 TEX100

Table of contents
1. Preliminary Instructions 1
2. Warranty 3
3. First Aid 5
3.1 Treating electric shocks 5
3.2 Treating electric burns 6
4. General Description 7
5. Installation and Use Quick Start 9
5.1 Preparation 9
5.2 Use 10
5.3 Operation using the Internal Stereo Encoder (TEX100/S) 12
5.4 Operation using an External Stereo Encoder 12
5.5 Monophonic Transmission 13
6. External Description 15
6.1 Front Panel (TEX100/S stereo version) 15
6.2 Front Panel (TEX100 mono version) 16
6.3 Rear Panel 17
6.4 Descrizione Connettori 18
7. Technical Specifications 19
7.1 Mechanical Specifications 19
7.2 Electrical Specifications 19
8. Identification and Access to the Modules 21
8.1 Modules Identification 21
8.2 Removal of the Modules 23
9. Operations Theory 27
9.1 Power Supply 28
9.2 Audio Input Card 28
9.3 Mixer board / stereo coder (TEX100/S version) 28
9.4 Amplificatore di potenza RF 29
9.5 Meter Card 30
9.6 Frequency Selector Card (Contraves) 30
9.7 Alarms Card 30
9.8 Mono/MPX Coder Card (mono version) 30
9.9 Main Card 31
10. Calibration Procedure 33
10.1 Internal Adjustment 33
Appendix
Component layouts, schematics, bills of material

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 TEX100

1. Preliminary Instructions
This manual is designed to provide a general guide to skilled and qualified personnel,
who are aware of the dangers that may arise when handling electric and electronic
circuits.

It does not aim to provide a complete description of all the safety precautions that
must be observed by people who use this or similar equipment.

The installation, operation, maintenance and use of this piece of equipment involve
risks both for people and the equipment itself, which must be handled only by
experienced technicians.

R.V.R. Elettronica SpA does not assume responsibility for injuries to persons or
damage to items caused by improper use or incorrect usage procedures, whether
the users are experienced or not.

Users should observe local regulations and fire-prevention rules while installing and
using this equipment.

WARNING: always disconnect the power before opening covers or removing any
part of the equipment.
Take appropriate earthing measures to discharge the condensers and high voltage
points before doing any maintenance work.

WARNING: this equipment may radiate radio-frequency energy, and if it is not installed
according to the instructions, may cause troublesome interference to radio
communications.
Operating this equipment in a residential environment may give rise to radio
disturbance; if so, the user may be asked to take appropriate counter measures.

R.V.R. Elettronica SpA reserves the right to make modifications to the design and
technical specifications of the equipment, and to update this manual without notice.

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 TEX100

2. Warranty
The guarantee, which is for 12 (twelve) months, is valid for any R.V.R. Elettronica
product.

On components such as tubes for final amplifiers, the manufacturer’s guarantee

applies.

R.V.R. Elettronica extends all transferable original guarantees to its own products.
To ensure that servicing is carried out properly and as fast as possible, the work shall
be handled by R.V.R. Elettronica; any claims should be sent directly to R.V.R.
Elettronica, in accordance with the defined procedures.

The warranty does not include:

1 damage while the equipment is being shipped to R.V.R. for repairs;
2 any unauthorized modification or repair;
3 accidental damage, or damage not due to defects in the equipment;
4 nominal damage not accidental;
5 shipping the equipment and insuring it, and replacement of parts or units.

Any damage to the equipment caused during shipment must be reported to the
transporters and notified in writing on the forwarding receipt.

Any difference or damage discovered after delivery must be reported to R.V.R.

Elettronica within 5 (five) days from the delivery date.

To take advantage of the guarantee, adopt the following procedure:

1 Contact the retailer or dealer where you bought the equipment; describe the
problem or fault to check if there is a simple solution.
Retailers and Distributors can provide full information on the problems that occur
most frequently; they can normally repair the equipment much faster than the
manufacturer
2 If your dealer cannot help you, contact R.V.R. Elettronica and describe the problem
to them; if necessary, you will be sent authorization with the necessary instructions;
3 When you have received authorisation, return the equipment carriage paid to the
address specified.
Pack it carefully, if possible in the original packing, and seal the package.

Do not return the machine without prior authorization, otherwise it may be returned to
you
4 Quote the machine’s type, model and serial number; attach a written technical
diagnosis listing all the problems and faults encountered, and enclose a copy of
the invoice.

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TEX100
Replacement of parts under guarantee or spare parts can be ordered from the
following address:

R.V.R. Elettronica SpA

Via del Fonditore, 2/2c
40138 BOLOGNA
ITALY
Tel. +39 051 6010506

quoting type, model and serial number of the device.

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 TEX100

3. First Aid
Personnel involved in the installation, use, and maintenance of the equipment must
be familiar with the theory and practice of first aid.

3.1 Treating electric shocks

3.1.1 If the victim is inconscious

Follow the first aid principles described below.

• Lay the victim down on his back on a rigid surface
• Free the respiratory tracts by raising the neck and pushing the forehead back
(Figure 1).
• If necessary, check the breathing of the victim opening his mouth.
• If the victim is not breathing, start artificial respiration immediately (Figure 2):
incline the head, close the nostrils, apply your mouth to the victim’s and make four
fast respirations.

Figure 1 Figure 2

• Check the heart beat (Figure 3); if there is none, start a cardiac massage
immediately (Figure 4) pressing the sternum approximately at the centre of the
chest (Figure 5).

Figure 3 Figure 4 Figure 5

• If there is just one person providing first aid, he must adopt a rhythm of 15
compressions and 2 fast respirations alternately.
• If there are two persons, the rhythm must be 1 respiration and 5 compressions
alternately

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TEX100
• Do not interrupt the cardiac massage during the artificial respiration.
• Call a doctor as soon as possible

3.1.2 If the victim is conscious

• Cover the victim with a blanket
• Keep him calm.
• Loosen the victim’s clothes and keep him lying down
• Call a doctor as soon as possible

3.2 Treating electric burns

3.2.1 Large-scale burns and serious cuts

• Cover the area concerned with a sheet or a clean cloth.
• Do not break the blisters; remove any fabric and parts of clothing that may be
attached to the skin; apply a suitable ointment.
• Treat the victim depending on the type of accident.
• Take the victim to hospital as soon as possible.
• If the arms and legs are injured, keep them raised.

If no medical help is available within an hour and the victim is conscious and has not
retched, administer a liquid solution of salt and bicarbonate of soda: 1 teaspoonful of
salt to every 250ml of water.
Get the victim to slowly drink half a glass of the solution, four times, over a period of
15 minutes.
Stop the treatment if the victim starts to retch.

Do not administer alcoholics!

3.2.2 Less serious burns

• Apply cold gauze compresses (not iced) using a clean cloth (i.e. as clean as
possible).
• Do not break any blisters; remove any fabric and parts of clothing that may be
attached to the skin; apply a suitable ointment.
• If necessary, dress the victim in clean dry clothes.
• Treat the victim depending on the type of accident.
• Take the victim to hospital as soon as possible.
• If the arms and legs are injured, keep them raised.

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 TEX100

4. General Description
The TEX100 is an exciter working in the 87.5 to 108 MHz band, programmable in
steps of 10KHz. Its power output is continuously adjustable from 5W to 100W into a
50 Ohm load and it’s contained in a 19” rack mountable 3HE case.

The power output control, audio input level control and analog meter for the
measurement of operating parameters, are all mounted on the front panel, beyond to
the selector of the working frequency and to various LED.

The line power, audio input, RF output and telemetry connectors are mounted on the
rear panel.

This device is present in two version: the mono (TEX100) and the stereo version
(TEX100/S).

The TEX100 incorporates a stereo coder which guarantees excellent stereo

separation together with low harmonic distortion (only for Stereo version). It also
accepts two SCA signals. A front panel switch allows stereo operation (only for stereo
version) or "mono/ mpx" operation which excludes the stereo encoder and uses the
"right" input as the mono input and the "left" input as the wideband composite input
(MPX).

The TEX100 (Mono/MPX version) can be used for monophonic trasmission or, with
an external coder stereo, for stereophonic transmission.

Both the versions include two subcarrier inputs, usable for RDS (Radio Data System)
transmission or SCA.

The specification features low audio distortion and intermodulation figures (typically
0.03%) and a high signal-to-noise ratio (typically -80 dB).

A voltage selector on the transformer primary allows a variety of supply voltages to

be used.

The operating parameters of the exciter can be monitored using the analog multimeter
situated on the front panel. The parameter to be measured is selected by the rotary
selector.

The frequency control allows frequencies to be selected in steps of 10KHz (note that
the actual norms in some countries preview the obligation of transmission on channels
with steps of 100 kHz; for this reason, the TEX100, comes supplied on demand with
step of selection of frequency of 100 kHz) .

Three red alarm leds indicate PLL unlock , excess SWR on the output and the excess
of temperature, and the shutdown condition, programmed by a remote command
(interlock). Three green leds indicate the presence of +12V, +15V and +28V voltages
which are used to power the various cards inside the exciter.

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TEX100
In the stereophonic version, are present two switch to that allows the selection
between Mono/MPX and Stereo functions and to disabled the 19 KHz subcarrier
from the coded signal.

For both the models, on the front panel is present a selector for the audio input
level adjustment. These can be regulated on fixed values of -9, -6, -3, 0 o +6
dBm (for 75 kHz of deviation), or a position can be selected where the inputs
can go from -12 to +9 dBm and the regulationfor the correct level of the deviation
comes made through two trimmer accessible from the panel.

The operating frequency is governed by a thermally-compensated, reference

oscillator working within a phase-locked loop (PLL). The TEX100 reaches
frequency lock within a maximum of 30 seconds.

The exciter contains the control circuitryfor the following functions:

• automatic control of the output power (maintains the prefixed level on all the
frequency range to varying of the work conditions, being based also on two
signals of external feedbacks)
• protection of the final stage from excess of standing waves (internal or
external), or from temperature excess.

The control circuits allow automatic control of output power(internal and external),
maintaining the chosen power level across the entire operating band.
Furthermore another circuit protects the final stage against excessive VSWR or
short circuits and excessive temperature.

Then, there are other protection circuits that allow to limit the maximum output
power and to protect the equipment against a power supply's overvoltage.

The RF amplifier is a wide-band design and guarantees an adjustable power

output up to 100 watts across the entire FM band.

A low-pass filter enables the TEX100 to be used as a low power transmitter,

connected directly to an antenna: the harmonic emissions are reduced under
the levels allowed from the international norms, like CCIR or FCC.

The TEX100 is designed in a modular way: the different functionalities are

performed by modules that are then interconnected either directly (the male
connector of one module plugs in the the female connector of another one) or by
means of connectors-ended cables. This design allows easy servicing and
replacement of the single modules.

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5. Installation and Use Quick Start

This chapter gives a concise view of the points that are necessary for the installation
of the device. If any item is not completely clear, for example when you use the exciter
for the first time, we strongly suggest to read throughly the manual.

5.1 Preparation

Unpack the exciter and before any other operation check the unit for any shipping
damage and check that all the controls and connectors on the front and rear panels
are in good conditions.

Check the mains voltage selector on the rear panel: the selected value is indicated
by an arrow. If required, extract the selector block levering with a little screwdriver.
Rotate the block until the correct printed value corresponds with the arrow, then reinsert
it.

The current capacity of the fuses are are the follows:

• Power supply (in the mains voltage selector block):

230-240V 3.15A 5X20
100-120V 6.3A 5X20

• P.A. Fuse 8A 10X38

• Fuse 6A 10X38

Now ensure that the “PWR ADJ” control is rotated fully anti-clockwise, using a small
screwdriver.

NOTE: The control is a ten-turn potentiometer so care should be taken to verify the
minimum position.

Units are usually shipped with this control already at minimum.

NOTE: When the unit is switched on with the control at its minimum position, power
output is about 5W.

Connect a dummy load with a power rating of at least 100 W continuous to the “N”
type connector of the RF output, situated on the rear panel of the unit. It is advisable
to connect a bypass wattmeter in series with this load in order to verify the accuracy
of the unit's own internal wattmeter, as shown in the Figure 5.1.

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TEX100

Figure 5.1

Connect a switch, via a cable, to the BNC connector (REMOTE 3) on the rear panel
so that the switch is able to short the central conductor to its screen. Leave the switch
in the short-circuit position. It is not indispensable to have a cable of this type, but it is
comfortable when is wanted to able or to disable fastly the emission of power is
wanted.

Verify that TEX100 is switch off.

Connect line power to the unit via the VDE socket.

NOTE: This device shall be correctly connected to ground. Correct grounding is

essential both for safety and to reach the rated performances.

5.2 Use

Select the desired operating frequency using the corresponding selector. The
frequency selector comprises five figures of which the three to the left of the decimal
point represent (from left to right) hundreds of MHz, tens of MHz and MHz. Examples
of right configurations are:

0 9 8 4 5 98.45 MHz

1 0 3 9 0 103.90 MHz

Furthermore, if a frequency is selected beyond the two limits of the 87.5-108 MHz
band, the amplifier will continue to work even through the displayed frequency no
longer corresponds to the operating frequency of the unit.

NOTE: Transmitting outside the legal band (87.5-108 MHz) is an offence and may
lead to prosecution. For this reason, the TEX100 can be equipped on demand with
a device that prevents the transmission on various frequencies from those concurred.

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 TEX100

Switch On the TEX100 and check that the three green internal voltage led and the
red UNLOCK led are all lit.

After having verified that the UNLOCK led is switched off (about 30 sec.) and that
the unit is therefore locked to the selected working frequency, switch the switch
connected to the REMOTE connector so as to remove the short circuit between the
central conductor and ground. The RF output is now enabled and should correspond
to a power level of about 5W. To check this reading, select FWD on the meter selector
and read the power from the 120 W FSD scale:

Using a small screwdriver, rotate the PWR ADJ control clockwise; the power output
should increase progressively to a maximum of 100W. Check the value with the
bypass wattmeter which should be within ±10%.

With the power output at 100W, select a new operating frequency well away from the
current value: at the same time will happens time that the“UNLOCK” led be litted
and that the output power goes completely to 0; only when the led turn off (new
locked frequency) it will be returned to having output power.

The functionalities of the TEX100 are described in the continuation.

• Automatic power control check

It is advisable to start this procedure with the operating frequency set to 87.50 MHz.
When locked to this frequency, the PWR ADJ control should be adjusted for an output
power of 50 W.

Now, with no further adjustment of the PWR ADJ control, change the operating
frequency in steps of 4-5 MHz, ensuring that the output power remains constant at 50
W.

• SWR alarm check

For this test, adjust the PWR ADJ control for a power output of 5W. Disconnect the
output load and check that the S.W.R. led switches on.

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TEX100
Now check that the reflected power doesn’t exceed 25% of the output power and
that, once exceed the alarm threshold, the output forward power decrease to avoid
that the final stage can be damaged.

Re-connect the output load and check that REF falls to zero, the SWR led switches
off and that PWR FWD jumps to 100 W.

• Deviation reading check

The maximum input sensitivity is determined by the position of the INPUT LEVEL
control. In the -12/+9 position, the sensitivity will depend on the L/mpx and R/
mono controls.

The following procedure is referred to a TEX100/S. For the Mono/MPX version,

proceed in analogous way.
• Put the selector in the L/MPX position.
• Connect a low-distortion audio generator to the LEFT and RIGHT inputs..
• Put the INPUT LEVEL control in the 0dBm position.
• Inject a 400 Hz tone at a level of 0dBm (775mVRMS = 2.2Vpp).
• Select stereo mode with the pilot tone enabled (the corresponding two leds
will switch on).
• Check that the reading is 0dB, measured on the +3dB FSD scale.
• Repeat the operation for the Right.
• In these conditions, verify that the deviation measured on the instrument
(position of selector on “DEV”) is of 75 kHz.

5.3 Operation using the Internal Stereo Encoder (TEX100/S)

Inject the pilot tone checking that the corresponding led switches on, than select
STEREO operation confirmed by the corresponding led.

Select the sensitivity of the audio LEFT/RIGHT inputs to match the signal level
being supplied to the unit. Connect the signal source to the LEFT/RIGHT inputs
(these are balanced inputs).

Check on the internal analog meter that the L/R signal levels are those expected,
selecting the desired input with the corresponding control. The effective modulation
level may be measured on the analog multimeter by selecting DEV with the
corresponding selector.

5.4 Operation using an External Stereo Encoder

Connect the stereo source's output to the MPX input of the unit.

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 TEX100

Figure 5.2

Adjust the stereo encoder to obtain just the 19 KHz subcarrier output and ensure the
total absence of signals on the left and right inputs of the encoder.

Adjust the output level of the encoder to obtain the correct level as displayed on the
analog meter of the TEX100, typically 7,5 KHz. Inject audio signals into the left and
right inputs of the encoder and adjust the sensitivity of the input (with both channels
enabled) to obtain a peak reading of MAX=75KHz.

5.5 Monophonic Transmission

Connect the signal source (audio mixer, receiver, compressor etc.) to the MONO
input (this input is unbalanced), and select the desired INPUT LEVEL.

Figure 5.3

Adjust the signal level of the equipment connected to the TEX100 (with the audio
signal present) for a peak reading of DEVIATION MAX 75 KHz.

NOTE: The international standards permit a maximum deviation of 75 KHz for

radiophonic transmissions in Frequency Modulated. Exceeding this limit will only
result in the degradation of signal quality and represents a violation of the laws and
regulations in vigor.

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6. External Description
This chapter describes the elements of the front and rear panels of the TEX100.

6.1 Front Panel (TEX100/S stereo version)

Figure 6.1

[1] STEREO/MONO MPX Selects STEREO or MONO/MPX operation

[2] STEREO LED When lit, indicates the operation of the stereo encoder
[3] 19KHz LED When lit, indicates the 19KHz pilot tone presence
[4] MODE SELECTOR Selects the enabled/disabled of the pilot tone inside the MPX
signal
[5] L/MPX & R/MONO LEVEL L/MPX and R/MONO input level adjustable from -12 to +9dBm;
this is possible if the input level [6] switch is completly turned
clockwise
[6] INPUT LEVEL Input signal attenuator adjustable in 5 steps from -9 to +6 dBm,
plus one position for continuous regulation
[7] SUPPLY LED When lit, indicates the presence of internal operating voltages
[8] SWR + TEMP Indicates that the reflected power exceeds 10W
[9] PWR ADJ Multi-turn trimmer to regulate the power output of the exciter.
AGC maintains constant the output level set by this control
[10] REMOTE When lit, indicates that the exciter has been shutdown by remote
control
[11] MEAS. SELECTOR The measurement made by the meter corresponds to the
position of this selector
[12] METER Analog meter used to display the following operating
parameters of the exciter:
Direct power f.s. 125W
Reflected power f.s. 25W
Deviation f.s. 100KHz
Right channel input level f.s. +3dB
Left channel input level f.s. +3dB
[13] POWER Switch ON/OFF selector
[14] MHz/KHz Rotatory frequency selector
[15] L.O. UNLOCK When lit, indicates that the VCO is not locked to the reference
frequency. The output power will drop zero in this condition

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TEX100
6.2 Front Panel (TEX100 mono version)

Figure 6.2

[1] L/MPX & R/MONO LEVEL Trimmer for the inputs levels regulation L/MPX and R/MONO;
when the inputs levels selector [ 2 ] is turned completely in
clockwise sense, the inputs levels can be regulated with
continuity between -12 and +9 dBm
[2] INPUT LEVEL Input signal attenuator adjustable in 5 steps from -9 to +6 dBm,
plus one position for continuous regulation
[3] SUPPLY LED When lit, indicates the presence of internal operating voltages
[4] SWR + TEMP Indicates that reflected power exceeds 10W
[5] PWR ADJ Multi-turn trimmer to regulate the power output of the exciter.
AGC maintains constant the output level set by this control
[6] REMOTE When lit, indicates that the exciter has been shutdown by
remote control
[7] MEAS. SELECTOR The measurement made by the meter corresponds to the
position of this selector
[8] METER Analog meter used to display the following operating
parameters of the exciter:
Direct power f.s. 125W
Reflected power f.s. 25W
Deviation f.s. 100KHz
Right channel input level f.s. +3dB
Left channel input level f.s. +3dB
[9] POWER Switch ON/OFF sselector
[10] MHz/KHz Rotatory frequency selector
[11] L.O. UNLOCK When lit, indicates that the VCO is not locked to the reference
frequency. The output power will drop zero in this condition

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 TEX100
6.3 Rear Panel

Figure 6.3

[1] FUSE BLOCK Fuse block and line voltage selector. Use a small screwdriver to
change the fuse or the line voltage. Rotate the block and position
it so that the arrow corresponds to the working voltage wished
[2] PLUG Line power connector
[3] REMOTE 1 BNC connector, extenal AGC input
[4] REMOTE 2 BNC connector, extenal reflected feedback input
[5] EXT REF 1KHz External 1KHz reference (optional)
[6] REMOTE 3 BNC connector. Connecting the central conductor to ground will
cause the Rf output power level to drop to zero and to stay
there until the short is removed. When used with an R.V.R.
amplifier, this connector should be connected to the REMOTE
output of the power amplifier
[7] FAN Fan assisted cooling for the power stage and the power supply
[8] TELEMETRY TERMINALS Telemetry terminals board
[9] P.A.. FUSE Power amplifier protection fuse 8A
[10] R.F. OUTPUT N type connector, 50Ohm
[11] R.F. TEST POINT -40dB output referred to the output power level
[12] FUSE Main protection fuse 6A
[13] RIGHT (MONO) BNC connector for FCC unbalanced version; cannon XLR for
CCIR version with balanced input
[14] LEFT (MPX) BNC connector for FCC version; cannon XLR for CCIR version
with balanced input
[15] SCA 1 BNC connector, unbalanced SCA1 input
[16] SCA 2 BNC connector, unbalanced SCA2 input or output (internally
selectable) for pilot tone (i.e. for R.D.S. encoder)

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TEX100

6.4 Descrizione Connettori

6.4.1 Sinistro (MONO) / Destro (MPX Bal)

Tipo: XLR femmina

2 1
1 GND
2 Positivo
3
3 Negativo

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 TEX100

7. Technical Specifications

7.1 Mechanical Specifications

Panel size 483 mm (19”) x 132.50 mm (5.20”) (3 HE)
Depth 345 mm (13.7”)
Weight 15 Kg
Temperature range -10 °C ¸ +50 °C

7.2 Electrical Specifications

General
A.C. Supply 117-230 V ±10%, 50-60 Hz single phase
Power consuption approx.230W
Cooling Forced ventilation
Frequency range from 87.5 to 108MHz in steps of 10KHz
Output power Adjustable Adjusable from 5 to 100W
Automatic output level control Stabilizes the set RF output level, septate
with internal or external reference
S.W.R. protection The maximum output power comes
diminished in proportional way in case the
reflected power increase; this control acts
with internal or external reference
Output Impedance 50Ohm
Output connector Standard “N”-type
Temperature control Intervene in case of temperature excess of
the final stage reducing the output power
Harmonic suppression > -70dB
Spurious signal suppression > -80dB
Intermodulation distorion 0.05% or less, measured at 1KHz and
1.3KHz, ratio 1:1 at 100% modulation
Frequency stability ± 500Hz (typically ± 300Hz) from 0° to 50° C
Modulation type Direct frequency modulation of the RF
oscillator at fundamental frequency
Frequency deviation ± 75KHz nominal
Harmonic distortion < 0.05% (tipically 0.01%)
FM signal/noise ratio > 75dB mono, > 70dB stereo measured with
75KHz deviation in the 30Hz to 15KHz band
RMS.
Residual AM (asyncronous) approx. 0.05% = 65dB RMS
Residual AM (syncronous) 0.1% = 60dB
Pre-emphasis 50µs ±2% or 75µs ±2% internally selectable
Audio input impedance 10KOhm balanced or 50KOhm unbalanced
(600Ohm on request)
Audio input level Selectable from -9 to +6dBm in 5 steps,
continuosly from -12 to +9 dBm
Audio frequency range 30-15000Hz, MONO input
30-10000Hz, MPX input
Audio input filter > 45dB at 19KHz (mono)
> 40dB from 20KHz to 100KHz
Mono frequency response ±0.3dB from 30Hz to 15KHz
MPX frequency response ±0.5dB from 30Hz to 75KHz
Stereo Separation > 45dB (typically 50dB)
Pilot tone frequency 19KHz ± 1Hz

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TEX100
Pilot tone level -20dBm adjustble
Number of SCA inputs 2
SCA input impedance 1KOhm unbalanced
SCA input level 0dBm per ±7.5KHz of deviation
SCA input response ±0.5dBm from 40KHz to 100KHz

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8. Identification and Access to the Modules

8.1 Modules Identification

The TEX100 is composed of different modules wired between them with connectors,
allowing for easy servicing or module substitution.

8.1.1 Bottom view

The figure below shows the upper view of the device with the indication of the different
components.

1 7 6

3 2 5 4

[1] Audio input card

[2] Power supply
[3] Switch power supply
[4] Analog meter
[5] Meter card
[6] Stereo coder card (for stereo version)
Scheda Mono/MPX (for mono version)
[7] Alarms card

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TEX100
8.1.2 Upper view

The figure below shows the bottom view of the device with the indication of the different
components.

9 2 1 8 6 7

3 4 5

[1] Power amplifier card

[2] Low pass filter
[3] Audio input card
[4] Main card
[5] Frequency selector card
[6] Meter card
[7] Analog meter
[8] Toroidal transformer
[9] Directional coupler

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 TEX100
8.2 Removal of the Modules

NOTE: When the exciter is operated with the cover removed, hazardous voltages
and heavy current are accessible. Ensure all primary power is disconnected from the
exciter before attempting equipment maintenance.

To reinstall the card is enough to execute operations sequence in the opposite way.

Remove all the screws that are located on the top and bottom covers of the machine.
After that the covers have been removed, extract, with the help of the upper and
bottom view, all exciter modules.

8.2.1 Stereo encoder card replacement

• Open the top and bottom covers of the unit.
• Disconnect connectors J1, J3 and J4.
• Unscrew the four nuts fixing the card on internal chassis.
• Unscrew the screw inside the INPUT LEVEL knob and slide it off.
• Raise the card from its supports, simultaneously sliding the switches and the
INPUT L\EVEL switch pivot from the panel.

8.2.2 RF power amplifier replacement

The power amplifier module is constituted from a preassembled block in which are
integrated circuits, the power devices and the cooling fin.

In order to remove this module, identify with the help of the wiring diagrams the various
cables connects to the module. Remove the power supply cable from the final stage
module and unsolder other cables. To disconnect the cable of RF input.

At this point, remove the screws that fix the amplifier module block to the rear of the
machine and the nuts that fixes it to the bottom and remove the module.

8.2.3 RF power amplifier transistor replacement

For this module it's only possible to replacement the transistors:

• Open the top cover of the unit.
• Unscrew the two fixing screws of the device (BGY33, MRF317 or SD1480).
• Remove the broken transistor.

NOTE: During replacement of broken devices it's necessary to pay attention to

device's pin position and insertion, to check that the device's fixing screws aren't in
short-circuit and to check that the soldering is good and without impurities.

NOTE: Interpose between devices and heat-sink an electronic silicone compound.

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TEX100
8.2.4 Main card replacement
• Open the top cover of the unit.
• Disconnects connector JP1, JP2 , JP4 and CN1
• Unscrew the fixing nuts of the main card on the internal chassis.
• Remove the card.

8.2.5 Audio input card replacement

• Open the bottom cover of the unit.
• Disconnects connectors CN1 and CN2.
• Unscrew the nuts of the two connectors BNC1 and BNC2 situated on the rear
panel.
• Desolder the six wires (placed on EC1 and EC2) connecting the Audio Input
Card to the two audio connectors, RIGHT (mono) and LEFT (MPX).
• Slide the card out.

8.2.6 Main power supply's transistors replacement

• Open the top and bottom covers of the unit.
• Remove from flat cable clamp the flatwire fixed on heat-sink.
• Cut the tagliare le fascette che fissano il modulo di alimentazione al dissipatore.
• Remove the switching power supply with all its cooling fin.
• Unscrew the two fixing screws of the two rectifier bridges.
• Desold4er the device's pins.
• Unscrew the fixing screws of the heat-sink and raise the top part of heat-sink
paying attention to cabling.
• Carefully lift out the device.

NOTE: During replacement of broken devices it's necessary to pay attention to

device's pin position and insertion, to check that the device's fixing screws aren't in
short-circuit and to check that the soldering is good and without impurities.

NOTE: Interpose between devices and heat-sink a thin layer of thermoconductive

paste.

8.2.7 Meter card replacement

• Open the top and bottom covers of the unit.
• Unscrew the four fixing screws of the front panel.
• Unscrew the nut inside the measurement selector situated on the front panel and
the selector fixing nut.
• Disconnect connectors CN1, CN2, CN3, CN6 and CN7 situated on the meter
card.

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 TEX100
• Disconnect the faston CN4.
• Remove the card paying careful attention to the various leds and adjustments.

8.2.8 Frequency selector card replacement

• Open the top and bottom covers of the unit.
• Unscrew the four fixing screws of the front panel.
• Disconnect connector CN1 situated on the Contraves card.
• Unscrew the two card's fixing screws on the front panel.
• Remove the Contraves card.

8.2.9 Sostituzione della scheda Mono/MPX

• Open the top and bottom covers of the unit.
• Disconnect connectors JP1, JP2 and JP3.
• Unscrew the four nuts fixing the card on internal chassis.
• Unscrew the screw inside the INPUT LEVEL knob and slide it off.
• Raise the card from its supports, simultaneously sliding the switches and the INPUT
LEVEL switch pivot from the panel.

8.2.10 Alarms card replacement

• Open the top and bottom covers of the unit.
• Disconnect connectors JP1 and JP2 of the Stereo Coder card (or Mono/MPX
card) to ease the removal of the Alarms card.
• Disconnect connectors CN1, CN2, CN3 and CN4.
• Unscrew the fixing screws of the card on the internal chassis.
• Remove the card.

8.2.11 Switching power supply replacement

• Open the bottom cover of the unit.
• Disconnect JP1 and JP2 from the switching card.
• Unscrew the two fixing screws of the components D2 and U1 placed on the heat-
sink.
• Unscrew the fixing screws of the switching card.
• Remove the card.

8.2.12 Directional coupler replacement

• Open the top and bottom covers of the unit.
• Disconnect input SMA connector.
• Desolder three wires connecting to the meter card.

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TEX100
• Unscrew the fixing screws of the two connectors on the rear panel.
• Remove the card.

8.2.13 Fan replacemement

• Open the top and bottom covers of the unit.
• Unscrew the fixing screws of the rear panel to ease fan removal, paying attention
to connecting wires.
• Unscrew the fixing screws of the R.F. Power Amplifier on the rear panel.
• Unscrews the fixed screws of the fan on the rear panel.
• Desolder the two supply wires of the fan from the main power supply module.
• Remove the fan.

8.2.14 Analog meter replacement

• Open the top and bottom covers of the unit.
• Unscrew the fixing screws of the front panel to ease Meter removal, paying attention
to connetcing wires.
• Disconnect connector CN3 on the meter card.
• Remove the analogic instrument.

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 TEX100
9. Operations Theory
The figure shows the block diagrams of TEX100 (fig. 9.1) and the TEX100/S (fig.
9.2). The blocks are described in the following chapter:

figure 9.1

figure 9.2

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TEX100
9.1 Power Supply

This circuit comprises a board, mounted on a heat sink, which is fixed to the central
part of the lower section of the unit.

The transformer has a selectable input from 110 VAC to 240 VAC and two outputs A
+18V (6.3A) and B +32V (10A).

This power supply is composed of two main parts: after having undergone “EMI”
filtering for mains-borne interference, the supply is transformed into four lower voltages,
rectified, smoothed and stabilized to the following values: +12V, +15V and 10 to 28V
variable to obtain the high efficiency (85-90%).

The +15V supplies the encoder mixer, the PLL card, the VCO card, the meter 100
card and the alarm card. The +12V supplies the input of RF power amplifier driver
(BGY33) and the 10-28V variable supplies the output of RF power amplifier driver
(BGY33) and the final power stage of the same module (two MRF317 or two SD1480).

The variable voltage of the final stage is controlled by the PWR ADJ control which
determines the R.F. power output of the exciter. The automatic control of output power
guarantees the power level set by the PWR ADJ control right across the frequency
range and independantly of other variables such as temperature, load variations etc.

The system works by comparing the value set by the PWR ADJ control with the actual
power output of the unit and compensating accordingly.

The final stage driver is composed of two separate parts, the input part is supplied
with +12V voltage, and the output part is supplied by the switching power supply with
4-12V variable voltage obtained dividing the 10-28V variable voltage. A power limiting
circuit intervenes in the event of excess SWR on the output, thus protecting the final
stage.

9.2 Audio Input Card

This card is situated on the rear panel of the exciter.

In this card travel the audio signals coming from the outside that come preventively
cleaned up from posiible interferences due to radiofrequency signals and
subsequently sendes to the mixer coder card. An appropriate connector makes
available outside the equipment the main electrical operation parameters of the
exciter for possible remote controls.

9.3 Mixer board / stereo coder (TEX100/S version)

This card is situated in the lower part of the unit.

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 TEX100
This card can work like stereo coder stereo or simple mixer of the various audio
inputs; the operation way is selected through an appropriate control on the frontal
panel.

In stereo encoder mode, the 19KHz pilot tone is derived from a quartz crystal
reference oscillator. So too is the sampling frequency which allows the L and R signals
to be separated from the multiplexed signal, plus the suppression of the 38KHz
frequency.

The level of the left and right signals is set by the corresponding selector situated on
the front panel. The signals are then filtered at 15KHz and pre-emphasized (50µS
CCIR, 75µS FCC) before being sent to the multiplex circuit.

The audio signals from the two SCA inputs are mixed in to provide the output.

In mixer mode (Mono/MPX) the stereo encoder is bypassed, the right input accepts
a mono signal (so filtered at 15 kHz) and the left input accepts a multiplex signal upto
100KHz. The SCA inputs remain unchanged.

Three rectifiers allow the peak levels of the two inputs "Left/MPX" and "right/mono"
to be displayed on the analog meter, and provide the audio detector circuit with the
deviation level.

9.4 Amplificatore di potenza RF

The final power stage is mounted on a cooling fin to dissapate waste heat and is
enclosed in a totally screened, metal container, fixed to the upper-middle part of the
central section of the unit.

The RF signal coming from the Stereo Decoder or Mono\MPX at a power level of
about 300 mW (+25dBm), reaches the driver stage (BLF244) and is amplified to a
variable level depending from the power regulated by the PWR ADJ control, before
being further amplified by the final stage (1480) to a level of up to 100 W. The resultant
signal is then filtered by a low-pass filter which removes any harmonic content.

A directional coupler allows the forward and reflected power levels to be measured
and displayed on the analog multimeter and also fedback to the power supply for
automatic control of the output power (see Power Supply description).

A BNC connector situated on the rear panel provides a power signal at -40 dB of the
amplifier output power.

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TEX100
9.5 Meter Card

This card is situated centrally on the front panel.

The card receives forward and reflected power signals from the power supply which,
in turn, come from the final power stage. The stereo encoder card supplies deviation
and left and right signal levels. These signal levels are normalized then displayed on
the analog meter according to the position of the rotary selector situated on the front
panel.

9.6 Frequency Selector Card (Contraves)

This card is fixed to the left-hand side of the front panel.

The operating frequency selected by the frequency control is represented by a signal

which is supplied to the frequency dividers that form part of the PLL circuits found on
the PLL card.

9.7 Alarms Card

This card is fixed in the lower part of the unit.

This circuit contains an rotative selector that allows to adjust, through 7 trimmers, the
threeshold of the external and internal output level, internal and external SWR level,
temperature and to preset the maximum value of the output power.

In case of fault there isn't an automatic reset, because the transmitter provides to
decrease the output power to continue the transmission without stops, even if at
minimum power.

9.8 Mono/MPX Coder Card (mono version)

This card is fixed in the lower part of the unit.

The Mono\MPX card is an Audio Mixer at four inputs, two balanced (Mono and MPX)
and two unbalanced (SCA1 and SCA2).

Mono and MPX input level can be setted through relative switches placed on front
panel, on 5 fixed positions and on a variable position from -12dBm to +9dBm
(presetted at 0dBm).

It's possible to set the pre-enphasis value at 50µS, 75µS or linear. Then, it's possible
to insert or remove a low pass filter at 15KHz.

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 TEX100
9.9 Main Card

This card in placed in the upper-left part of the unit.

The functionalities of the card can be subdivided in three sections: Audio, PLL and
VCO.

The Audio section takes the audio signal coming from mixer coder (for stereo
version) that comes amplified and tried in order to compensate the distorsions caused
from the varicap diodes and therefore inject in VCo section to execute the modulation.

The digital section PLL includes a reference crystal oscillator (optionally can be
used an external reference ), a logic section that includes the frequency dividers and
the comparator.

The reference cristal oscillator generates a 10MHz frequency that is divided to

generate a 1KHz fixed signal.

This signal is sended to the comparator (LMX1501) and menaged by the

microcontroller (PIC16F877Q) that confront it with the signal produced by the VCO
opportunely divided in base on the working frequency setted on the frequency selector.

The unlocked situation (difference of the signal dissimilar from 0) comes indicated
from the appropriate pointer place on the front panel.

At the output of the comparator is present a signal (Rf PLL), which comes sended to
the varicap placed on the VCO card.

La VCO section includes an audio input stage at low frequency, a Voltage Controlled
Oscillator at low noise (VCO) and a drive stage.

The Voltage Controlled Oscillator (VCO) generated the signal on the working frequency
impostated on the card by the rotative selector (Contraves).

This signal is amplified to 300 mW level (25 dBm) to drive the final stage and to be
sended to the PLL control section.

The VCO operating frequency, after opportune division, comes compared to a

reference frequency obtained from a high stability generator and the error tension,
subsequently filtered, comes used to guarantee the stability of the VCO frequency.

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 TEX100
10. Calibration Procedure

10.1 Internal Adjustment

Attenzione: Please note that this kind of operations should only be done by skilled
technical people. Remember that this operation is not normally needed, if not in case
of extraordinary maintenance operations. Opening the device may void you’re
warranty.

10.1.1 Stereo coder adjustment

It will be necessary to check and recalibrate the following parameters after

replacement of the Stereo Encoder card

figura 10.1
• Select 0dBm on the INPUT LEVEL selector (encoder and pilot tone inserted).
• Connect a low distortion, sine-wave, audio generator to the left and right inputs.
• Connect a 50 Ohm 100 W load to the RF output of the TEX100/S.
• Connect the drawing of -40 dB (11 Fig.2) to the input of the own modulation
analyzer.
• Connect a stereo MEAS-decoder to the rear FM-MPX output of the F.A.M.
• Switch on the TEX100 and wait for the PLL to lock.
• Adjust the audio output of the generator to 0dBm (2.2Vpp = 775mVRMS 400Hz).
• Check, using the modulation analyser regulated for peak measurement, that the
deviation is 75 kHz; in couter case acts on the RV6 and RV7 trimmers on the
actual TEX100 main card or on the trimmer RV1 of the VCO card in the previous
version.
• Remove the audio signal from both channels, leaving the pilot tone inserted,and
check that the deviation is between 6.5KHz and 8KHz (typically 7.5KHz). Adjust
RV7 if necessary.
• Remove the audio signal from one channel, for example the right channel.

NOTA: Check that, removing a channel, the ouput is still at 0dBm.

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TEX100
Now measure the stereo separation with the Stereo Meas-Decoder, which, with a
400Hz signal, should be better than 45dB. Repeat the operation for the other channel.
To maximized the stereo separation, is possible acts on the compensator C41 (pilot
tone phase) and on RV6 (right channel separation) and RV7 (left channel separation)
trimmers.

10.1.2 VCO card adjustment (old version)

After having replaced the VCO Card and relevant connectors, carry out the following
procedure:

MONO VERSION
• Connect an audio generator to the Mono input or MPX.

figure 10.2
• Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Connect the drawing of -40 dB to the input of the own modulation analyzer.
• Inject a 400Hz, 0dBm (775mVrms = 2.2Vpp) tone into the Mono (or MPX) input.
• Configure the FAM to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
• Verify correct value on TEX100's analog meter.

STEREO VERSION
• Connect an audio generator to the Left and Right inputs (together)
• Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Connect the drawing of -40 dB to the input of the own modulation analyzer.
• Inject a 400Hz, 0dBm (775Vrms=2.2Vpp) tone into Left and Right.
• Configure the F.A.M. to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
• Verify correct value on TEX100's analog meter.

NOTE: The audio generator used in these tests must have a distortion figure better
than 0.01%. Perform this test at the operating frequency of the exciter.

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10.1.3 RF power amplifier module adjustment

No calibration is required after the replacement of this card.

10.1.4 Power supply adjustment

No calibration is required after the replacement of these two cards (Main power
supply and switching power supply).

10.1.5 Audio input card adjustment

No calibration is required after the replacement of this card.

10.1.6 Meter card adjustment

All meter readings should be calibrated after the replacement of any card:
• Inject a 400 Hz, 0dBm pilot tone into the Left or Right inputS
• Connect a bypass wattmeter between the RF output and a 50 Ohm, 100W dummy
load.
• Adjust the power output to 100W.
• With the selector, select the following measurements and make adjustments
according to the table below:
MEASUREMENT VALUE FSD TRIMMER NOTE
R(MONO) 0dB +3dB R6
L(MPX) 0dB +3dB R5
FWD PWR 150W 125W R8
REF PWR 10W 50W R7 1
DEV VAR 100KHz R4
SWR LED --- --- R23

NOTA: 1 - Disconnect the load for this measurement only and adjust PWR ADJ for
50W of direct output power.

10.1.7 Frequency selector card adjustment

No calibration is required after the replacement of this card.

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TEX100
10.1.8 PLL card adjustment (old version)

After having replaced the PLL card, carry out the following procedure (see the setup
below):

figurE10.4
• Switch on the equipment and select the frequency of 98MHz.
• Wait 10 minutes to have thermal stabilization of the equipment.
• Unscrew the fixing screws of PLL's metal box and open the cover near to VCO
metal box.
• Check with frequency meter if the frequency setted is right. If the frequency read
on frequency meter is different from frequency setted on the contraves , adjust the
compensator placed on the TCXO accesible trhrough a little hole on the PLL card
box.

10.1.9 Alarms card adjustment

After having replaced the alarms card, carry out the following procedure:

Internal AGC Adjustment

• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• Turn trimmer R2, placed on Alarms card, completely clockwise.
• Increase output power until maximum through PWR ADJ trimmer (clockwise).

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• Adjust variable capacitor C2 on Directional Coupler to read, through a voltmeter
between Directional Coupler's REF contact and GND (see as reference
Directional Coupler Layout), minimum voltage value.
• Adjust R2 to obtain a reading of 100W on external wattmeter.
• Select with Meter Selector the FWD position.
• Adjust trimmer R8 on METER card to read 100W on TEX100's analog meter.

Internal VSWR Adjustment

• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• Turn trimmer R7, placed on Alarms card, completely clockwise.
• Disconnect external dummy load, increase output power until 150W turning PWR
ADJ trimmer clockwise.
Output power must increase slowly because the protection is working. (If this
doesn't happen, suspend all operation e contact the seller)
• Adjust R7 to obtain a reading of 10W on external wattmeter.
• Select with Meter Selector the REF position.
• Adjust trimmer R7 on METER card to read 10W on TEX100's analog meter.

External AGC Adjustment

• Perform the setups below (fig. 10.5 and 10.6).

figure 10.5

figure 10.6
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• This adjustment it's necessary when TEX100 is connected as exciter or driver for
a power amplifier. Therefore, it's necessary to have on last amplifier of the system
an output voltage proportional with antenna output forward power and connect
this signal to REMOTE1.

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TEX100
Increase TEX100's output power with PWR ADJ to have the necessary output
power to drive the next stage of the system (e.g. for a 1KW amplifier, read 1050W
on external wattmeter).
• Turn trimmer R16, until to have maximum output power of the power amplifier on
external wattmeter (e.g. 1000W). In these conditions is possible to control output
power into the range of 50W presetted, protecting the equimpment against voltage
variations).

Regolazione VSWR Esterno

• Perform the setup below:

figure 10.7
• Adjust output power at minimum turning PWR ADJ trimmer completely counter-
clockwise and then switch on the equipment.
• This adjustment it’s necessary when the TEX100 is connected as exciter or driver
for a power amplifier. Therefore, it’s necessary to have on last amplifier of the
system an output voltage proportional with antenna output reflected power and
connect this signal to REMOTE2.
Increase TEX100's output power with PWR ADJ to have the necessary output
power to drive the next stage of the system (e.g. for a 1KW amplifier, read 1050W
on external wattmeter).
• Turn trimmer R12, until to have an output power of the power amplifier on external
wattmeter (e.g. 900W, -10%). In these conditions is possible to control output
power into the range of ±10% presetted, protecting the equimpment against VSWR
variations).

Temperature Alarm Adjustment

• Perform the setup below:

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• Adjust output power at minimum turning PWR ADJ trimmer completely

counterclockwise and then switch on the equipment.
• Increase output power until 100W, turning PWR ADJ trimmer clockwise.

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TEX100
• Tare R23 trime until the output power begin to decrease.
• Tare R25 trime until the LED “SWR/TEMP” begin to flash.
• Turn trimmer R23, until to have on pin 3 of U4 a voltage included between 265
and 275 mV. In these conditions temperature protection starts at 70°C.

Maximum Output Power Adjustment

Can be necessary to set maximum output power at maximum value included between
5 and 100W.
• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Adjust output power at minimum turning PWR ADJ trimmer completely
anticlockwise and then switch on the equipment.
• Increase output power until 100W turning PWR ADJ trimmer clockwise.
• Turn trimmer R44, until to have maximum output power presetted on external
wattmeter.
• Then, adjust output power turning PWR ADJ trimmer and note that output power
can be increased over presetted value.

NOTE: The jumpers shown in table , disable all protections (all enabled from firm). A
no-correct use of these jumpers can cause seroius damage to the unit and will
automatically make the warranty void.

ALARMS CARD TRIMMERS AND JUMPERS

REF. DESCRIPTION
R2 Internal AGC Adjustment

R7 Max Power Output Adjustment (VSWR INFINITE)

R12 External VSWR Threshold Adjustment

R16 External AGC Adjustment

R23 Temperature Threshold Adjustment

R25 Temperature Led Lighting Adjustment

R44 Max Power Output Adjustment

JP1 Internal AGC Insertion (DON'T REMOVE)

JP2 Internal AGC Insertion (DON'T REMOVE)

JP3 External VSWR Insertion

JP4 External AGC Insertion

JP5 Temperature Threshold Insertion

JP6 Maximum Output Power Threshold Insertion

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 TEX100
10.1.9 Main card adjustment

To tare the TEX100 main card must adjust the three trimmers present on the card.

Like in the previous version of VCO card, is present a trimmer for the deviation
regulation (RV7), one for the distortion regulation (RV6) and one for the polarization
regulation of the varicap in order to obtain the minimum refuse in the entire frequency
range (RV9).

MONO VERSION
• To connect an audio generator to Mono or MPX input.

figure 10.2
• Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Connect the drawing of -40 dB to the input of the own modulation analyzer.
• Inject a 400Hz, 0dBm (775mVrms = 2.2Vpp) tone into the Mono (or MPX) input.
• Configure the FAM to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
• Verify correct value on TEX100's analog meter.

STEREO VERSION
• Connect an audio generator to the Left and Right inputs (together)
• Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
• Connect a 50 Ohm, 100 W dummy load to the RF output.
• Connect the drawing of -40 dB to the input of the own modulation analyzer.
• Inject a 400Hz, 0dBm (775Vrms=2.2Vpp) tone into Left and Right.
• Configure the F.A.M. to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
• Verify correct value on TEX100's analog meter.

NOTE: The deviation can lightly vary with the working frequency, suggests to execute
this measure to the exciter operation frequency, in order to obtain the minimum refuse
point is necessary adjust RV9 and obtain 4.1V on TP18 test point.

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TEX100
In the case was necessary control or modify the positions of SW5 Dip-switch, for
example after the substitution of the card, make reference to the table shown in
continuation:

F u n c tio n 1 2 3 4 5 6 7 8
E x te rn a l re fe re n c e a t 1 0 M H z - - - - - - - -
E x te rn a l re fe re n c e a t 1 0 M H z x - - - - - - -
E x te rn a l re fe re n c e a t 1 M H z - x - - - - - -
E x te rn a l re fe re n c e a t 5 0 0 K H z x x - - - - - -
E x te rn a l re fe re n c e a t 1 0 0 K H z - - x - - - - -
E x te rn a l re fe re n c e a t 1 9 K H z x - x - - - - -
E x te rn a l re fe re n c e a t 1 0 K H z - x x - - - - -
E x te rn a l re fe re n c e a t 5 K H z x x x - - - - -
N o n e C u s to m e r - - - - - - - -
N O A A C u s to m e r (1 6 0 M H z w ith 1 2 5 0 H z ) - - - x - - - -
I ta lia C u s to m e r ( L im its 8 7 .6 – 1 0 7 .9 ) - - - - x - - -
S in g le d ip s w itc h N O A A C u s to m e r ( S W 4 ) - - - x x - - -

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