Adjustment - Kenwood TK-980 Service Manual

Test Mode
Test Mode Operating Features
This transceiver has a test mode. To enter test mode,
press [A] key and turn power on. Hold [A] key until test
channel No. and test signalling No. appears on LCD.
Test mode can be inhibited by programming. To exit test
mode, switch the power on again. The following functions
are available in test mode.
• Controls ("FCN" appears)
[PTT] Used when making a transmission.
[MON] Monitor on and off.
[SCN] MSK 1200bps and 2400bps.
[A] Function off.
[B] Compander function on and off.
[C] Talk around on and off.
[D] Function off.
[System Up/Down] Changes channel
[Volume Up/Down] Volume up/down.
• Controls ("FCN" not appears)
[PTT] Used when making a transmission.
[MON] Monitor on and off.
[SCN] Sets to the tuning mode.
[A] Function on.
[B] None.
[C] Changes signalling.
[D] None.
[System Up/Down] Changes channel
[Volume Up/Down] Volume up/down.
Note : If a [SCN], [A], [B], [C] key is pressed during transmis-
sion, the DTMF corresponding to the key that was pressed
is sent.
• LCD indicator
"SCN" Unused
" " Lights at compander on.
"AUX" Unused.
"P" Unused.
"MON" Lights at monitor on.
"SVC" Unused.
" " Lights at MSK 2400bps.
• LED indicator
Red LED Lights during transmission.
Green LED Lights when there is a carrier.
• Sub LCD indicator
"FCN" Appears at function on.
Frequency and Signalling
The set has been adjusted for the frequencies shown in
the following table. When required, re-adjust them follow-
ing the adjustment procedure to obtain the frequencies you
want in actual operation.

ADJUSTMENT

• Frequency (MHz)
Channel
No. RX (TX : TA)
1
2
3
4
5
6
7
8
9
10
11~16
• Signalling
Signalling No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Note : In test mode, if the operation frequency is in NPSPAC
band (e.g. SYS 10), all deviations are automatically changed
as the system deviation becomes ± 4kHz.
• Preparations for tuning the transceiver
Before attempting to tune the transceiver, connect the
unit to a suitable power supply.
Whenever the transmitter is turned, the unit must be
connected to a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a
4Ω dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
• Transceiver tuning
(To place transceiver in tuning mode)
Channel appears on LCD. Set channel according to tun-
ing requirements.
LCD display (Test mode)
TK-980/981
TK-980
TX RX (TX : TA)
851.05000 806.05000 935.0250
851.55000 806.55000 935.0500
860.00000 815.00000 938.0000
860.50000 815.50000 938.0250
865.98750 820.98750 939.9875
869.40000 824.40000 940.4000
869.90000 824.90000 940.9000
855.40000 810.40000 936.2500
865.60000 820.60000 939.3000
867.50000 822.50000 936.7500
– –
RX
None None
None 100Hz square
LTR data LTR data
QT 67.0Hz QT 67.0Hz
QT 151.4Hz QT 151.4Hz
QT 210.7Hz QT 210.7Hz
QT 250.3Hz QT 250.3Hz
DQT D023N DQT D023N
DQT D754I DQT D754I
DTMF DEC, (159D) DTMF ENC, (159D)
None DTMF tone
None None
None Single tone 1200Hz
None MSK
MSK code MSK code
–
1
Channel No.
TK-981
TX
896.0250
896.0500
899.0000
899.0250
900.9875
901.4000
901.9000
897.2500
900.3000
897.7500
– –
TX
1
Signalling No.
43