Kenwood TK-285, Service Manual

Page: 27 / 43

TK-285/(N)
26
Test Mode
■
Test mode operating features
This transceiver has a test mode.
To enter test mode, press
[B] key and turn power on. Hold [B] 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 “FNC” appears “FNC” not appears
[PTT] Used when making a Used when making
transmission. a transmission.
[AUX] Release FNC Unused
[CALL] Release FNC Monitor ON and OFF.
[CLEAR] Lamp ON/OFF No Func
[A] FFSK 1200bps Sets to the Tuning
and 2400bps. mode.
[B] Release FNC FNC ON.
[C] Compander function RF power HIGH and
ON and OFF. LOW.
[D] Best shift ON and OFF. Changes signalling.
[O] to [9], Release FNC No Func
and [#],[
∗
] No Func
[ENCODER] Release FNC Changes channel.
• LCD indicator
“SCN”
Unused
“ ” Lights at Compander ON.
“LO” Lights at RF Power Low.
“P” Unused
“MON” Lights at moniter ON.
“SVC” Unlock
“ ” Lights at FFSK 2400bps.
• 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
“FNC”
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) (K, E type)
Channel No. RX frequency TX frequency
1 233.05000 234.10000
2 217.05000 218.10000
3 249.95000 249.90000
4 227.00000 227.00000
5 227.20000 227.20000
6 227.40000 227.40000
7 ~ 16
Frequency (MHz) (M type)
Channel No. RX frequency TX frequency
1 255.05000 255.10000
2 240.05000 240.10000
3 269.95000 269.90000
4 260.00000 260.00000
5 260.20000 260.20000
6 260.40000 260.40000
7 ~ 16
Signalling
Signalling No. RX TX
1 None None
2 None 100Hz Square wave
3 QT 67.0Hz QT 67.0Hz
4 QT 151.4Hz QT 151.4Hz
5 QT 210.7Hz QT 210.7Hz
6 QT 250.3Hz QT 250.3Hz
7 DQT 023N DQT 023N
8 DQT 754I DQT 754I
9 None DTMF tone 9
10 None Single Tone 1600Hz
(HSD OUT)
11 None Single Tone 1200Hz
(MODEM OUT)
12 None Single Tone 1800Hz
(MODEM OUT)
13 None FFSK(PN pattern)
14 FFSK(CODE) FFSK(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
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.
ADJUSTMENT