Kenwood TKR-850 Service Manual page 40

TKR-850
Item Condition
4. RX PLL lock 1) RX VCO A high
voltage CH : 11 K
CH : 10 K2,K3,E
2) RX VCO A low
CH : 10 K
CH : 1 K2,K3,E
3) RX VCO B high
CH : 3 K,K2
CH : 11 K3,E
4) RX VCO B low
CH : 5 K
CH : 6 K2,K3,E
5. TX PLL lock 1) TX VCO high
voltage CH : 3
2) TX VCO low
CH : 1
6. RX 1) Connect the frequency
frequency counter to CN3, then
measure the frequency
CH : 2
Note : RX frequency means the local frequency of the RX VCO. So its frequency is wanted frequency minus the IF frequency.
7. Setting 1) Remove 8 pin cable and the coaxial cable from CN16, and CN19 on TX-RX side.
8. TX 1) Connect the frequency
frequency counter to CN19, then
measure the frequency
CH : 2
9. Setting 1) Insert 8 pin cable and the coaxial cable to CN16, and CN19 on TX-RX side.
10. Maximum 1) Measure the RF power at
power TX ANT.
limitting High CH
11. TX RF 1) Measure the RF power at
high power TX ANT.
Low CH
2) Center CH
3) High CH
12. TX RF 1) Measure the power level at
low power TX ANT.
Low CH
2) Center CH
3) High CH
13. BPF 1) Connect the TG to RX ANT,
then connect CN1 to the
spectrum analyzer input.
Spectrum analyzer setting
Span : 50MHz
Scale : 10dB to 5dB div
Tracking generator setting
Output : –30dBm
40
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
DVM TX-RX RX-CV RX VCO TC350 1.50V
(A/2) (A3)
RX VCO TC351 1.50V
(A3)
TX-CV TX VCO TC350 1.50V
(A2)
f. counter CN3
f. counter TX-RX CN19
(A/2)
Power meter Rear TX ANT Final
Tracking Rear RX ANT TX-RX L2
generator (A/2)
Spectrum TX-RX CN1
analyzer (A/2)
Adjustment
Parts Method
± 0.1V
Check 8V or less
± 0.1V
Check 8V or less
± 0.1V
K,K2,E
TC351
K3
Check 8V or less
PC adj. 50Hz or less
Test CH–44.85MHz
PC adj. 50Hz or less
Adjust the RF power ± 1W
VR1
to 43W.
± 1W
PC adj.
40W
(Factory-default)
± 1W
PC adj.
25W
(Factory-default)
Center the frequency
L4 you are using, then
L5 adjust it to look like
the wave Fig. 1.
(Page 39)
Specifications/Remarks