Kenwood TH-K4AT Service Manual page 40

TH-K4AT/K4E
Item Condition
To exit from the Adjustment
Mode, turn the transceiver
power OFF and then ON.
2)Frequency: 435.000MHz
PTT: ON
Battery terminal voltage: 6.4V
(Adjust the output voltage from DC power supply until the voltage at the
battery terminal becomes 6.4V while the transceiver is transmitting.)
4.DCS Switch to Adjustment mode
modulation and carry out the operations
balance for adjustment item L.
(Refer to page 33)
Detector: +P, –P
HPF: OFF
De-emphasis: OFF
TX power: Low
1)LCD display: DCS.BAL
Frequency: 435.000MHz
PTT: ON
5.MAX DEV To exit from the Adjustment
Mode, turn the transceiver
power OFF and then ON.
MIC terminal input
AG: 1kHz/80mV
Detector: +P, –P
HPF: OFF
De-emphasis: OFF
TX power: Low
1)Frequency: 435.000MHz
PTT: ON
6.MIC MIC terminal input
sensitivity AG: 1kHz
Check Detector: P-P/2
HPF: OFF
LPF: 15kHz
De-emphasis: OFF
TX power: Low
1)Frequency: 435.000MHz
PTT: ON
40
ADJUSTMENT
Measurement
Test equipment
DC power supply
DVM
Linear detector
Oscilloscope
LPF: 3kHz
Linear detector
AG
Oscilloscope
LPF: 15kHz
Unit Terminal Unit Parts
LCD
TX-RX ANT
(A/3)
VR6
ANT VR5
MIC
Adjustment
Specifications/
Remarks
Method
Check 4 to 6 seg-
ments are
lighted.
By tuning the
VR6, adjust
the modulation
wave until
if becomes the
square wave.
4.2kHz ±0.1kHz
According to the
larger +, –.
Change the AG 4mV - 12mV
output level to
obtain 3kHz
deviation.
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