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