Kenwood TK-7160 Service Manual page 32

TK-7160/7162
Item
4. Low 1) CH : TX low
power CH : TX low'
CH : TX center
CH : TX high'
CH : TX high
2) Transmit
5. DQT 1) CH : TX low (Wide)
balance CH : TC center
(Wide/Wide 4k/Narrow)
CH : TX high (Wide)
2) Transmit
6. MAX 1) CH : TX low (Wide)
balance CH : TC center
(Wide/Wide 4k/Narrow)
CH : TX high (Wide)
2) AG : 1kHz/50mV
3) Transmit
7. MIC 1) CH : TX center
sensitivity (Wide/Wide 4k/Narrow)
2) AG : 1kHz/5mV
3) Transmit
8. DQT 1) CH : TX center
deviation (Wide/Wide 4k/Narrow)
2) Transmit
9. QT 1) CH : TX center
deviation (Wide/Wide 4k/Narrow)
2) Transmit
10. DTMF/ 1) CH : TX center
MSK (Wide/Wide 4k/Narrow)
deviation 2) Transmit
11. Single 1) CH : TX center
tone (Wide/Wide 4k/Narrow)
deviation 2) Transmit
If normal power is not obtained, please follow the
step below
Open the shielding cover (upper), and screw 3 locations
around ANT pin.
1. Switch off the transceiver.
Impedance of Power module (IC502) can be measured
easily using DVM Ω mode.
Normal condition
Input : 20kΩ~50kΩ, Output : 1MΩ ~2MΩ
The above impedance values are rough estimations.
32
ADJUSTMENT
Condition
Test equipment
Power meter
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Modulation analyzer ANT
or Linear detector
(LPF : 15kHz)
Oscilloscope
AG
AF V.M
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
LPF : 15kHz
Measurement
Terminal Parts
ANT PC key
PC key
MIC
2. Check input power level at Drive FET (Q502) gate location.
Connect the wire to [RF] location.
Transmit and check for power to be within the range of
0.3W~0.6W.
If power found is less than 0.3W, check the circuit before
the Drive FET.
Adjustment
Specifications/
Method
± 1.0W
5W
Adjust the waveform as below
± 4.0kHz (Wide) ± 50Hz
± 3.2kHz (Wide 4k)
± 2.0kHz (Narrow)
According to the large +, –
± 3kHz± 0.2kHz
Check
(Wide)
± 2.4kHz± 0.2kHz
(Wide 4k)
± 1.5kHz± 0.1kHz
(Narrow)
± 0.75kHz (Wide) ± 0.05kHz
± 0.60kHz (Wide 4k)
± 0.35kHz (Narrow)
± 0.75kHz (Wide) ± 0.05kHz
± 0.60kHz (Wide 4k)
± 0.35kHz (Narrow)
± 3.0kHz (Wide) ± 0.2kHz
± 2.4kHz (Wide 4k)
± 1.5kHz (Narrow)
Remarks