Pcb Section; Receiver Section - Kenwood TK-7108 Service Manual

TK-7108

PCB Section

Item
1. Setting 1) Power supply voltage
DC Power supply terminal : 13.6V
2. VCO lock 1) CH : TX high
voltage 2) CH : RX high
3) CH : TX low
4) CH : RX low
3. IF coil 1) CH : RX center (Wide)
2) SSG output : –53dBm (501µV)
Mod : 1kHz
Dev : 3kHz
4. RF 1) CH : RX center (Wide)
bandpass CH : RX low (Wide)
filter CH : RX high (Wide)
2) Track generator output : –30dBm
Connect the spectrum analyzer
to BPF terminal

Receiver Section

Item
1. Sensitivity 1) CH : RX low (Wide/Narrow)
CH : RX center (Wide/Narrow)
CH : RX high (Wide/Narrow)
2) SSG output
: –118dBm (0.28µV) (Wide)
: –116dBm (0.35µV) (Narrow)
Mod : 1kHz
Dev : ± 3.0kHz (Wide)
Dev : ± 1.5kHz (Narrow)
2. Squelch 9 1) CH : RX low (Wide)
CH : RX center (Wide/Narrow)
CH : RX high (Wide)
2) SSG output
: –115dBm (0.4µV) (Wide)
: –114dBm (0.45µV) (Narrow)
Mod : 1kHz
Dev : ± 3.0kHz (Wide)
Dev : ± 1.5kHz (Narrow)
48
ADJUSTMENT
Condition
Test equipment
Digital voltmeter
SSG
Digital voltmeter
Track generator
Spectrum analyzer
Condition
Test equipment
SSG
Oscilloscope
AF V.M
Distortion meter
Measurement
Terminal Parts
CV TC402
TC401
AFV L301
ANT TC351
BPF TC352
Measurement
Terminal Parts
ANT
EXT. SP
PC key
Adjustment
Specifications/
Method
± 0.1V
5.5V
± 0.1V
5.5V
Check 0.7V or more
3.25~3.35V (DC)
Adjust the BPF waveform
to Fig. 1
Fig. 1
Adjustment
Specifications/
Method
Check SINAD
: 12dB or higher
Adjust to open the squelch
Remarks
Remarks