Test Mode - Kenwood TK-280 Service Manual

TK-280

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
Controls "FCN" appears
[PTT] Used when making a Used when making
transmission.
[AUX] Unused
[MON] Monitor ON and OFF. Monitor ON and OFF.
[LAMP] Lights the lamp for five Changes wide and
seconds.
Lighting is extended for
a further five seconds by
pressing any key while
the lamp is lit.
[S] Sets to the Tuning
mode.
[A] Function OFF
[B] Compander function
ON and OFF.
[C] Best shift ON and OFF. Changes signalling.
[O] to [9], Used as the DTMF
and [#],[∗] keypad. If a key is
pressed during trans- pressed during trans-
mission, the DTMF
corresponding to the
key that was pressed key that was pressed
is sent. (keypad model) is sent. (keypad model)
[ENCODER] Changes channel.
Note: If a [S],[A],[B],[C] key is pressed during transmission,
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
" " Unused
• 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.
"n" appears at Narrow ON.
38
ADJUSTMENT
"FCN" not appears
a transmission.
Unused
narrow.
Sets to the Tuning
mode.
Function ON.
RF power HIGH and
LOW.
Used as the DTMF
keypad. If a key is
mission, the DTMF
corresponding to the
Changes channel.
■ 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)
Channel No.
RX
1 160. 05000
2 146. 05000
3 173. 95000
4 160. 00000
5 160. 20000
6 160. 40000
7~16
Channel No.
RX
1 149. 05000
2 136. 05000
3 161. 95000
4 149. 00000
5 149. 20000
6 149. 40000
7~16
Signalling
Signalling 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 2 tone 321.7/928.1Hz 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.
When ever 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
16Ω 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 tuning
requirements.
VHF-F1 K, K3, M
TX
160. 10000
146. 10000
173. 90000
160. 00000
160. 20000
160. 40000
VHF-F2 K2, K4
TX
149. 10000
136. 10000
161. 90000
149. 00000
149. 20000
149. 40000
TX
None
100Hz square
LTR data
QT 67.0Hz
QT 151.4Hz
QT 210.7Hz
QT 250.3Hz
DQT D023N
DQT D754I
DTMF ENC, (159D)
DTMF tone 9
Single tone 1200Hz
MSK
MSK code