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|  TM 11-5820-670-30
2-9. RECEIVER CARRIER SQUELCH SENSITIVITY TEST. (CONT)
STANDARD. Audio is present.
7. If audio is not present, see troubleshooting chart 2-11.
8. Observe AN/URM-103 output level (squelch pull-in).
STANDARD. 0.7 microvolt maximum
9. If AN/URM-103 output level is more than 0.7 microvolt, see troubleshooting chart 2-11.
10. Reduce AN/URM-103 output level until audio output indication disappears. Observe AN/URM-
103 output level (squelch dropout).
STANDARD. 0.55 microvolt maximum
11. If AN/URM-103 output level is more than 0.55 microvolt, see troubleshooting chart 2-11.
12. Press SQ DIS switch on front panel of RT-823/ARC-131.
STANDARD. Audio is present.
13. If audio is not present, see troubleshooting chart 2-11.
14. Repeat steps 1 through 13, adjusting TS-2575/ARC-131 for each of the following frequencies:
41.00 MHz, 52.00 MHz, 65.00 MHz, and 75.00 MHz.
15. Set mode switch on TS-2575/ARC-131 to RETRAN.
16. Set SQUELCH switch on TS-2575/ARC-131 to CARR.
17. Set VOL control on TS-2575/ARC-131 to midrange.
18. Set C-1611 D/AIC VOL control to midrange.
19. Disconnect cable CG-3371/U (W7) from NORMAL J107 and reconnect to REXMIT J109 on test
set.
20. Repeat steps 1 through 14 and observe the following conditions.
IF STANDARD IS
NOT VERIFIED, SEE
TROUBLESHOOTING
CHART
CONDITION
STANDARD
2-11
1000 Hz tone is present
With RETRANSMIT RCVR lamp
in speaker and headset,
illuminated
2-11
2.17 to 3.45
Voltmeter reading on TS-723A/U
RETRANSMIT RCVR lamp not
2-11
illuminated
No audio signal present.
2-18
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