Kenwood TKR-850 Service Manual page 43

TKR-850
Item Condition
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
14. MCF 1) Connect the TG to CN2, then
(Wide) connect CN4 to the spectrum
analyzer input.
CH : 2 (Wide)
Spectrum analyzer setting
Span : 50kHz to 25kHz
Scale : 10dB to 2dB div
Center freq' : 44.850MHz
Tracking generator setting
Output : –30dBm
(Narrow) 2) CH : 2 (Narrow)
15. Discrimi- 1) Connect the SSG to RX ANT. SSG
nator CH : 2 (Wide)
SSG output : –53dBm/501µV
SSG MOD : 1kHz
SSG DEV : 3kHz
AF : 2V/4Ω
16. Threshold 1) Connect SSG to RX ANT.
squelch CH : 2 (Wide)
(Wide) SSG output : 3dB below to
12dB SINAD level
SSG MOD : 1kHz
SSG DEV : 3kHz
AF : 2V/4Ω
2) SSG : OFF
(Narrow) 3) CH : 2 (Narrow)
SSG output : 3dB below to
12dB SINAD level
SSG MOD : 1kHz
SSG DEV : 1.5kHz
AF : 2V/4Ω
4) SSG : OFF
44
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Power meter Rear TX ANT
Tracking Rear RX ANT TX-RX L2
generator (A/2)
Spectrum TX-RX CN1
analyzer (A/2)
CN2
CN4
Rear RX ANT
AF VM TEST/SPKR
Distortion jack SPO
meter (pin 12)
SSG Rear RX ANT
Audio TEST/SPKR
analyzer jack SPO
VTVM (pin 12)
Oscilloscope
Adjustment
Parts Method
± 1W
PC adj.
25W
(Shipping power)
Center the frequency
L4 you are using, then
L5 adjust it to look like
the wave Fig. 1.
(Page 48)
L14 Adjust it to look like
L17 the wave Fig. 2.
L18 (Page 48)
L15 Adjust it to look like
L16 the wave Fig. 3.
L19 (Page 48)
L24 Adjust the distortion
to minimum.
PC adj.
Adjust to point of
opening squelch
Check Squelch must be closed.
PC adj.
Adjust to point of
opening squelch
Check Squelch must be closed.
Specifications/Remarks