Test Mode - Kenwood FM Transceiver TK-481 Service Manual

TK-480/481

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 avail-
able in test mode.
• Controls
Controls "FCN" appears
[PTT] Used when making a
transmission.
[AUX] Unused
[MON] Monitor ON and OFF.
[LAMP] Lights the lamp for five
seconds.
Lighting is extended for
a further five seconds by
pressing any key while
the lamp is lit.
[S] MSK 1200 bps and
2400 bps
[A] Function OFF
[B] Compander function
ON and OFF.
[C] Beat shift ON and OFF
[0] to [9], Used as the DTMF
and [#], keypad. If a key is
[ ] pressed during trans-
*
mission, the DTMF
corresponding to the
key that was pressed
is sent. (keypad model)
[ENCODER] Changes system.
Note : If a [S], [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.
"LO" Lights at RF Power Low.
"P" Unused
"MON" Lights at moniter ON.
"SVC" Unused
" " Lights at MSK 2400 bps.
• LED indicator
Red LED Lights during transmission. Blinks at the
low battery voltage warning.
Green LED Lights when there is a carrier.
34
ADJUSTMENT
"FCN" not appears
Used when making
a transmission.
Unused.
Monitor ON and OFF.
Unused.
Sets to the Tuning
mode.
Function ON.
RF power HIGH and
LOW.
Changes group.
Used as the DTMF
keypad. If a key is
pressed during trans-
mission, the DTMF
corresponding to the
key that was pressed
is sent. (keypad model)
Changes system.
• 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 following
the adjustment procedure to obtain the frequencies you
want in actual operation.
Frequency (MHz)
TK-480
SYS No.
RX (TX : TA) TX
1 851.0500 806.0500
2 851.5500 806.5500
3 860.0000 815.0000
4 860.5000 815.5000
5 865.9875 820.9875
6 869.4000 824.4000
7 869.9000 824.9000
8 855.4000 810.4000
9 865.6000 820.6000
10 867.5000 822.5000
11~16 – –
Signalling
Group No. RX
1 None
2 None
3 LTR data
4 QT 67.0Hz
5 QT 151.4Hz
6 QT 210.7Hz
7 QT 250.3Hz
8 DQT D023N
9 DQT D754I
10 DTMF DEC, (159D)
11 None
12 None
13 Single tone 1200Hz
14 None
15 MSK code
• 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
16 dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
TK-481
RX (TX : TA) TX
935.0250 896.0250
935.0500 896.0500
938.0000 899.0000
938.0250 899.0250
939.9875 900.9875
940.4000 901.4000
940.9000 901.9000
936.2500 897.2500
939.3000 900.3000
936.7500 897.7500
– –
TX
None
100Hz square
LTR data
QT 67.0Hz
QT 151.4Hz
QT 210.7Hz
QT 250.3Hz
DQT D023N
DQT D754I
DTMF DEC, (159D)
DTMF tone 9
None
Single tone 1200Hz
MSK
MSK code