Kenwood TH-K40A Service Manual page 19

Frequency and Signaling
The transceiver 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.
■ Test Frequency
CH Receive (MHz)
1 435.05000
2 400.05000
3 469.95000
4 435.00000
5 435.20000
6 435.40000
7~16 -
■ Signaling
No. RX (Decode)
1 None
2 None
3 CTCSS 67.0Hz
4 CTCSS 151.4Hz
5 CTCSS 210.7Hz
6 CTCSS 254.1Hz
7 DCS D023N
8 DCS D754I
9 None
10 None
11 None
– +
ADJUSTMENT
Transmit (MHz)
435.10000
400.10000
469.90000
435.00000
435.20000
435.40000
-
TX (Encode)
None
100Hz Square Wave
CTCSS 67.0Hz
CTCSS 151.4Hz
CTCSS 210.7Hz
CTCSS 254.1Hz
DCS D023N
DCS D754I
DTMF
(Code: 159D)
DTMF
(Code: D)
1633Hz Tone
BATT+ (7.5V)
BATT– (GND)
TH-K40A/K40E
Preparations for Tuning the Transceiver
Before attempting to tune the transceiver, connect the
unit to a suitable power supply.
Whenever the transmitter is tuned, the unit must be con-
nected to a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a
8 dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
■ Tuning frequency
Tuning point Receive (MHz)
Low 400.05000
Center 435.05000
High 469.95000
Adjustment Points
TX-RX UNIT
Component side view
CV
Foil side view
S417
S418
MONI
PTT
POW/VOL
VR300
S419
SP
MIC
J301 J300
ENCODER
Note: When replacing CF200 and C
the point shown in the fi gure.
Transmit (MHz)
400.10000
435.10000
469.90000
MIC300
ANT
+
BATT
-
BATT
SPK
SPG
CN300
CF200
CD200
200, apply bond to
D
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