TKR-750 service manual
TKR-750 service manual
TKR-750 service manual
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<strong>TKR</strong>-<strong>750</strong><br />
ADJUSTMENT<br />
Item<br />
Condition<br />
Measurement<br />
Testequipment<br />
Unit Terminal<br />
Adjustment<br />
Unit Parts Method<br />
10. TX 1) High CH (Automatically) f. counter TX-RX CN19 PC adj.<br />
frequency (A/2) 173.9975MHz<br />
(tune)<br />
2) Low CH (Automatically) PC adj.<br />
136.0025MHz<br />
Specifications/Remarks<br />
11. Setting 1) Insert 8 pin cable and the coaxial cable to CN16, and CN19 on TX-RX side.<br />
12. Maximum 1) Measure the RF power at Power meter Rear TX ANT Final VR1 Adjust the RF power ± 1W<br />
power TX ANT. to 53W.<br />
limitting High CH<br />
13. TX RF 1) Measure the RF power at PC adj. ± 1W<br />
high power TX ANT. 50W<br />
Low CH<br />
(Shipping power)<br />
2) Center CH<br />
3) High CH<br />
14. TX RF 1) Measure the power level at PC adj. ± 1W<br />
low power TX ANT. 25W<br />
Low CH<br />
(Shipping power)<br />
2) Center CH<br />
3) High CH<br />
15. BPF 1) Connect the TG to RX ANT, Tracking Rear RX ANT TX-RX L2 Center the frequency<br />
then connect CN1 to the generator (A/2) L3 you are using, then<br />
spectrum analyzer input. L5 adjust it to look like<br />
Spectrum analyzer setting Spectrum TX-RX CN1 L6 the wave Fig. 1.<br />
Span : 50MHz analyzer (A/2) L7 (Page 46)<br />
Scale : 10dB to 5dB div<br />
Tracking generator setting<br />
Output : –30dBm<br />
16. MCF 1) Connect the TG to CN2, then CN2 L14 Adjust it to look like<br />
(Wide) connect CN4 to the spectrum CN4 L17 the wave Fig. 2.<br />
analyzer input. L18 (Page 46)<br />
CH : 2 (Wide)<br />
Spectrum analyzer setting<br />
Span : 50kHz to 25kHz<br />
Scale : 10dB to 2dB div<br />
Center freq‘ : 44.850MHz<br />
Tracking generator setting<br />
Output : –30dBm<br />
(Narrow) 2) CH : 2 (Narrow) L15 Adjust it to look like<br />
L16 the wave Fig. 3.<br />
L19 (Page 46)<br />
17. Discrimi- 1) Connect the SSG to RX ANT. SSG Rear RX ANT L24 Adjust the distortion<br />
nator CH : 2 (Wide) to minimum.<br />
SSG output : –53dBm/501µV AF VM TEST/SPKR<br />
SSG MOD : 1kHz Distortion jack SPO<br />
SSG DEV : 3kHz meter (pin 12)<br />
AF : 2V/4Ω<br />
18. Threshold 1) Connect SSG to RX ANT. SSG Rear RX ANT PC adj.<br />
squelch CH : 2 (Wide) Adjust to point of<br />
(Wide) SSG output : 3dB below to Audio TEST/SPKR opening squelch<br />
12dB SINAD level analyzer jack SPO<br />
SSG MOD : 1kHz VTVM (pin 12)<br />
SSG DEV : 3kHz<br />
Oscilloscope<br />
AF : 2V/4Ω<br />
2) SSG : OFF Check Squelch must be closed.<br />
42
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