jotron TR6101 User manual

Technical Handbook and
Maintenance Manual
TR6101
VHF Ground to Air Radio
Transceiver
3280 TJODALYNG, NORWAY

JOTRON electronics a.s.
December, 99
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December, 99
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AMENDMENT RECORD
AMDT INCORP.
BY
DATE PAGE(S) AMDT INCORP.
BY
DATE PAGE(S)
1OH 11.9.95 29,45,46,79,80 21
2BJ 25.3.96 92 22
3OH 19.11.96 74 23
4OH 25.9.97 11 24
5ER 20.04.99
EM3215
11 25
6 26
7 27
8 28
9 29
10 30
11 31
12 32
13 33
14 34
15 35
16 36
17 37
18 38
19 39
20 40

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The information in this book is carefully checked and believed to be accurate. However, no
responsibility is assumed for inaccuracies.
CAUTION!
This equipment contains CMOS integrated circuits. Observe handling precautions to avoid
static discharges that may damage these devices.
WARNING!
Some RF semiconductor devices used in this equipment may contain Beryllium Oxide.
If inhaled, dust from this oxide can be toxic.
No danger will arise from normal handling but no attempt should be made to tamper with
these devices. On no account must these transistors be destroyed or discarded with industrial
or domestic waste, but should be returned to the manufacturers for subsequent disposal.
JOTRON electronics a.s reserves the right to make changes without further notice
to any products or modules described herein to improve reliability, function or design.
JOTRON electronic a.s does not assume any liability arising
out of the application or use of the described product.

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December, 99
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TABLE OF CONTENTS
1. TECHNICAL DATA ........................................................................................................................................9
1.1. GENERAL DATA.................................................................................................................................................9
1.2. RECEIVER DATA..............................................................................................................................................10
1.3. TRANSMITTER DATA: ......................................................................................................................................11
2. EXTERNAL CONNECTIONS ...................................................................................................................... 13
2.1. FRONT PANEL COMPONENTS AND CONTROLS ..................................................................................................13
2.2. REAR PANEL CONNECTIONS ............................................................................................................................16
3. INSTALLATION ............................................................................................................................................21
3.1. EQUIPMENT SAFETY PRECAUTIONS .................................................................................................................21
3.2. POWER ON .....................................................................................................................................................21
3.3. CHANGING THE OPERATING FREQUENCY.........................................................................................................22
3.4. SELECTING PRE-PROGRAMMED CHANNELS......................................................................................................22
3.5. PROGRAMMING A CHANNEL............................................................................................................................22
3.6. SQUELCH ON/OFF.........................................................................................................................................22
3.7. KEYING THE TRANSMITTER .............................................................................................................................22
4. INTERNAL ADJUSTMENTS .......................................................................................................................23
4.1. SQUELCH ADJUSTMENT ..........................................................................................................................23
4.2. MODULATION AND POWER ADJUSTMENT .........................................................................................24
5. TECHNICAL DESCRIPTION, TR-6101 .....................................................................................................27
5.1. GENERAL.....................................................................................................................................................27
5.2. POWER SUPPLY / POWER BOARD..........................................................................................................27
5.3. FRONT BOARD............................................................................................................................................28
5.4. LINE INTERFACE BOARD.........................................................................................................................28
5.5. 10W UNIT .....................................................................................................................................................29
5.6. TRANSMITTER UNIT, TR-6201.................................................................................................................30
5.7. RECEIVER UNIT, TR-6201 .........................................................................................................................30
5.8. AUDIO UNIT, TR-6201................................................................................................................................31
5.9. CONTROL UNIT, TR-6201..........................................................................................................................32
5.10. FRONT BOARD, TR-6201 .........................................................................................................................32
6. APPLICATIONS ............................................................................................................................................33
6.1. INTERFACING WITH A REMOTE CONTROL.........................................................................................33
6.2. CONNECTING ONE TRANSCEIVER TO A RC-3104 .............................................................................................35
6.3. CONNECTING TWO TRANSCEIVERS TO A RC-3104...........................................................................................36
6.4. CONNECTING ONE TRANSCEIVER TO A RC-3401 .............................................................................................37
6.5. CONNECTING TWO TRANSCEIVERS TO A RC-3401...........................................................................................38
7. PARTS LISTS .................................................................................................................................................39
8. DRAWINGS ....................................................................................................................................................73

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1. TECHNICAL DATA
1.1. General data
Frequency range: 118 - 136.975 MHz
Frequency stability: 10 ppm
Channel spacing: 25 kHz
Presetable channels: 8 channels
Modulation: A3 300 to 3000 Hz
Power supply: AC: 115 / 230 V ± 10 %
DC: 24 - 32 V, floating ground.
Power output will be reduced when power supply is
below 26V.
Power consumption: Less than 75 VA at 10W output, 95% modulation.
Environmental conditions :
Operating temperature: 0 to + 55 ª C
Humidity: 90% at 40 ª C without moist.
Shock: (Transport)
IEC-721-3-2, Class 2M3
Vibration: (Transport)
IEC-68-2-32, Class 2M3
IEC-68-2-6
Dimension: 19” standard rack.
405mm (W) * 250mm (D) * 88 mm (H)
Weight: 6,5 kg

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1.2. Receiver data
Sensitivity: AM: S/N better than 10 dB for an input signal of less than
1 µV pd (-107 dBm), 30%, 1kHz modulation, according to
CCITT.
IF selectivity: Less than 6 dB down at +/- 7,5 kHz
More than 80dB down at +/- 20 kHz
AGC: Less than 3 dB audio variation for input signal levels between
2,0 µV and 250 mV pd.
Intermodulation Two interfering signals of equal amplitude and at least 70 dB
more than the desired signal and at a distance of 100 kHz from
the operating frequency will not generate 3rd order
intermodulation products, at the receiver output, larger than the
desired signal.
Squelch: Internally adjustable between 1 µV and 50 µV, selectable
on/off from front panel.
Hysteresis less than 3 dB.
Audio outputs:
Loudspeaker: Max. 1 W, 10 ohm, adjustable by volume
controls.
Line: Adjustable from -20 to + 10 dBm.
Ri = 600 .
Floating transformer with centre tap.
Distortion: Less than 5% with 70% modulation,
100mV RF input signal.

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1.3. Transmitter data:
Carrier power: 10 W (40 W PEP) ± 1 dB.
Distortion 5% THD at 90% mod.
S/N ratio 35 dB at 90% mod.
Frequency response 300 - 2900 Hz + 2, - 6 dB ref 1kHz.
At least - 20 dB at 100Hz and 5 kHz.
Mod index 90% AM,
Line input 600 balanced, -30 to +10 dBm.
Microphone input 600 , 5mV sensitivity.
Supply voltage: 24 V to 32 V.
Permissible mismatch: VSWR 1 : 3.
Harmonic distortion: Less or equal than 1*10-5 W
Spurious output: Less or equal than 1*10-7 W

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2. EXTERNAL CONNECTIONS
2.1. Front panel components and controls
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①Monitor (Loudspeaker).
1W, 10 audio output.
②Fuses, AC and DC.
AC fuses: 2*1A, 5x20 mm (slow blow)
DC fuse: 4 A, 5x20 mm (slow blow)
③AC indicator (Green LED).
Lit when AC power is connected and unit switched on.
④DC indicator (Yellow LED).
Lit when internal DC is present, i.e. the transceiver is operated on either AC or DC.
⑤Power ON/OFF switch.
Main switch to turn on the transceiver.
⑥Carrier indicator (Red LED).
Indicates that there is a RF signal going out on the antenna connector.
The intensity of the light varies slightly with the modulation level, that means the
LED can be used as an indicator for the modulation level.

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⑦Microphone input.
The microphone socket is either a 4 or a 6 pin connector. In the case of a 6 pin
connector, pin 5 and 6 must be shorted together when using an ordinary microphone.
These pins are used if a telephone handset are in use.
The microphone should have 600Ωimpedance with a sensitivity of 5 mV.
4 - pin microphone socket.
The 4-pin microphone socket has the following pin assignment:
➀Microphone input.
➁No connection
➂P.T.T. (Local key) input
➃Microphone ground.
6 - pin microphone socket.
The 6-pin microphone socket has the following pin assignment:
➀Microphone input.
➁No connection
➂P.T.T. (Local key) input
➃Microphone ground.
➄Speaker (headphone) out.
➅Speaker (headphone) in.
⑧Local remote switch.
The switch decides whether the audio and keying signals should be taken from the
microphone socket or from the remote connector.
In local position, both audio for the transmitter and the key signal (PTT) is taken from
the microphone input.
7In remote, audio and key signals are taken from the 600 remote line input/output.
The 600 remote line will also output the received audio in when the switch is in
remote position.
The built in loudspeaker will be connected in either position of the switch.

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⑨HEADPHONE CONNECTOR
The headphone connector outputs the audio to a headphone instead of the internal
loudspeaker.
The loudspeaker is automatically switched off when a jack is connected in the socket.
Volume control will work adjust the level in the headphone instead of the
loudspeaker.
⑩TR-6201, Driver unit.
❶Display.
Displays the operating frequency or information when storing or recalling memory
channels.
❷Function switch.
The switch has 4 positions.
In OFF position the transceiver is switched off.
In CH position 8 different channels can be selected with the SELECT switch.
In kHz position the frequency is changed in 25 kHz steps by the SELECT switch.
In MHz position the frequency is changed in 1 MHz steps by the SELECT switch.
❸VOLUME pot. meter.
By turning the knob clockwise the volume of the internal loudspeaker is increased.
The knob has no effect on the line output level.
❹SQUELCH button.
The SQUELCH button toggles the squelch on and off.
Squelch level is preset by an internal pot. meter.

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❺SELECT switch.
The SELECT switch increments or decrements the channel, or frequency according to
the position of the FUNCTION switch.
2.2. Rear panel connections
2134
➀
➀➀
➀Antenna connector (N-type)
The antenna connector should be connected to a 50 antenna.
The VSWR of the antenna must be less than 3:1, preferable less than 2:1 for a well
performing system.
➁REMOTE CONNECTOR (25 pin D-SUB)
The remote connector contains the necessary signals for interfacing the radio to
remote equipment. The connector has the following pin configuration.
PIN NO
1 SIDETONE OUTPUT
The sidetone output is a high impedance output which can be used to
monitor the transmitted audio. The signal is the AC component of the
demodulated signal when the transceiver is keyed.
2 REMOTE KEY DC INPUT
The remote key in is used to key the transceiver in the remote position.
The key signal must be a DC voltage between 5 and 30V referred to
GND (pin 14). The transceiver is keyed when the DC voltage is applied.
3/4 600 LINE INPUT/OUTPUT
The 600 line contains the received audio in receive mode and the audio
to be transmitted in transmit mode. The transceiver must be in REMOTE
position to use the line.
The transceiver can also be keyed with this line by using line loop keying
(making a DC path between the two lines).

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5 EXTERNAL SPEAKER
The signal is connected in parallel with the internal speaker and has a
220 serial resistor (Front board, R4). The output could be used for an
external speaker with a high impedance (typically 1 k ) or to an external
amplifier. The signal is referenced to GND (pin 14).
6 NO CONNECTION
7 REMOTE KEY GND INPUT
The pin is used to key the transceiver with a GND signal in REMOTE
position, i.e. connecting this pin to GND (pin 14) will key the
transceiver.
8 MONITOR OUTPUT
The monitor output contains the received signal in receive mode and the
demodulated transmitted audio in transmit mode.
This signal could be connected to a monitoring device, i.e. a tape
recorder for recording the radio conversation. The output must be
connected to a high impedance input on a tape recorder (typ. 100 k ).
9 D1, REMOTE CHANNEL SELECTION, NSB1
The pin is the second most significant bit of the remote channel selection.
A TTL signal is used to set the channel, the signal is active low (0V)
referred to GND (pin 14). The signal is pulled up internally.
10 STROBE, REMOTE CHANNEL SELECTION, STROBE1
The pin is used to strobe the new remote channel selection that is set up
with D0, D1 and D2 into the transceiver. The strobe signal is 0V for at
least 1 ms, referred to GND (pin 14). The signal is pulled up internally.
11 NO CONNECTION
12 NO CONNECTION
13 NO CONNECTION
14 GND
Internal ground (0V).
NOTE! The signal is not connected to chassis.
1The signals D0, D1, D2 and STROBE are only available when the transceiver is fitted with an
optional remote control interface. When this option is installed the transceiver has a µcontroller fitted in
the socket for IC3 on the remote control interface and the driver unit has been modified accordingly.
With this option installed, it is possible to control 6 channels from a remote position with the remote
control RC-3401.

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15 LOCAL KEY INPUT.
The signal is connected in parallel with pin 3 on the microphone
connector and may be used for an external microphone, connected to the
rear of the transceiver. The signal should be referred to MIC. GND (pin
17). A closed contact between these pins will key the transceiver in local
position.
16 MICROPHONE INPUT
The signal is connected in parallel with pin 1 on the microphone
connector and may be used for an external microphone, connected to the
rear of the transceiver. The signal should be referred to MIC. GND (pin
17).
17 MIC. GND
This pin is connected in parallel with pin 4 on the microphone connector
and is the ground for the microphone signals (audio and PTT).
18 AUXILIARY CONTACT, NORMALLY CLOSED
The pin is connected to the normally closed pin of an auxiliary relay.
See pin 19 for operation.
19 AUXILIARY CONTACT, CENTER PIN
The pin is connected to the centre pin of an auxiliary relay.
The relay operates by default when the transceiver is keyed or the squelch
is open. It could be made to operate only if the transceiver is keyed by
removing link 1 on the line interface board.
Maximum current through the relay contacts should be limited to 200
mA.
20 AUXILIARY CONTACT, NORMALLY OPEN
The pin is connected to the normally open pin of an auxiliary relay.
See pin 19 for operation.
21 D0, REMOTE CHANNEL SELECTION, LSB1
The pin is the least significant bit of the remote channel selection. A TTL
signal is used to set the channel, the signal is active low (0V) referred to
GND (pin 14). The signal is pulled up internally.
22 D2, REMOTE CHANNEL SELECTION, MSB1
The pin is the most significant bit of the remote channel selection. A TTL
signal is used to set the channel, the signal is active low (0V) referred to
GND (pin 14). The signal is pulled up internally.
23 NO CONNECTION
24 NO CONNECTION
25 NO CONNECTION

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➂DC INPUT CONNECTOR
Input for external DC. The DC voltage should be at nominal battery voltage, app. 27V
and rated for 5A continuous current consumption.
The transceiver will automatically draw the current from this input when the AC
voltage is not present.
Pin A is 27 V DC.
Pin B is internal ground (0V) - not chassis!
➃
➃➃
➃AC INPUT CONNECTOR
Input for external AC.
AC is input between A and C, B is chassis ground.
The voltage should be 230VAC ± 10% or optionally 115 ± 10%.
To use 115VAC the transceiver must be rewired internally, see WIRING DIAGRAM
for details.

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