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|  TM 11-5820-401-34-3/0967-LP-432-3060
3-3. RECEIVER SENSITIVITY TEST. (CONT)
3.
Disconnect T-connector from AN/USM-207.
4.
Adjust R-442/VRC VOLUME control for 17-volt indication on TS-723(*)/U meter.
5.
If 17-volt indication cannot be obtained, see troubleshooting chart 3-10.
6.
Disconnect TS-723(*)/U METER leads from MK-1978/VRC jacks.
7.
Connect TS-723(*)/U AF INPUT lead B to MK-1978/VRC SPKR jack; connect lead A to GND
jack. (See test setup diagram
)
8.
Turn TS-723(*)/U FUNCTION switch to SET LEVEL.
9.
Adjust TS-723(*)/U AF INPUT control for zero-db indication on meter.
10.
Change TS-723(*)/U FUNCTION switch to DISTORTION.
11.
Adjust TS-723(*)/U FREQUENCY and BALANCE controls for minimum meter indication.
STANDARD. The new TS-723(')/U meter indication (step 11) should be at least -10 db from the
previous zero-db indication (step 8).
12. If TS-723(*)/U meter indication is not at least -10 db from previous indication, see trouble-
shooting chart 3-2.
Sensitivity Test at 53.00 MHz
13. Change R-442/VRC MC-TUNE-KC switch to 53.00 MHz and BAND to
.
14. Turn AN/URM-103 BAND SWITCH to
and RF TUNING control for 53.00-MHz meter
indication.
15. Reconnect TS-723(*)/U METER lead C to MK-1978/VRC SPKR jack; reconnect lead D to GND
jack.
16. Adjust AN/URM-103 RF TUNING control for 53.00-MHz display on AN/USM-207. To produce
display, see note under step 2 and readjust RF TUNING control until AN/USM-207 indicates
53.00 MHz,
17. Repeat steps 3 through 12.
Sensitivity Test at 41.00 MHz
18. Change R-442/VRC MC-TUNE-KC switch to 41.00 MHz and BAND to
.
19.Turn AN /URM-103 BRAND SWITCH to
and RF TUNING control for 53.00 MHZ meter
indication.
20. Reconnect TS-723(*)/U METER lead C to MK-1978/VRC SPKR jack; reconnect lead D to GND
jack.
21. Adjust AN/URM-103 RF TUNING control for 41.00-MHz display on AN/USM-207. To produce
display, see note under step 2 and readjust RF TUNING control until AN/USM-207 indicates
41.00 MHz.
22. Repeat steps 3 through 12.
Sensitivity Test at 64.00 MHz
23. Change R-442/VRC MC-TUNE-KC switch to 64.00 MHz and BAND to
.
24. Turn AN/URM-103 BAND SWITCH to
and RF TUNING control for 64.00-MHz meter
indication.
25. Reconnect TS-723(*)/U METER lead C to MK-1978/VRC SPKR jack; reconnect lead D to GND
jack.
26. Adjust ANLJRM-103 RF TUNING control for 64.00-MHz display on AN/USM-207. To produce
display, see note under step 2 and readjust RF TUNING control until AN/USM-207 indicates
64.00 MHz.
27. Repeat steps 3 through 12.
3-7
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