TEST PROCEDURE-continued - TM-11-5820-670-300137

TM 11-5820-670-30

2-21. SQUELCH SWITCH AND FREQUENCY SELECTION TEST. (CONT)

14. If kHz indicator on gearbox assembly does not correspond to last two digits of selected fre-

quency, see troubleshooting chart 2-24, item 7.

15. Increase frequency setting of control unit from 30.00 MHz to 52.00 MHz in 1 MHz steps.

STANDARD. The MHz indicator on gearbox assembly should correspond to frequency selected at

control unit. Antenna coupler simulator should also indicate the tens and units digits

selected.

16. If the performance of step 15 does not meet the standard, see troubleshooting chart 2-24,

item 8.

NOTE

The lamp on antenna coupler simulator should light for frequencies between 30 MHz and

40 MHz (BAND A). At 49 MHz (BAND B), the green lamp should light and remain lit. If

trouble occurs, see troubleshooting chart 2-24, item 8.

17. Set control unit frequency selectors to 53.00 MHz.

STANDARD. Band switch on gearbox assembly operates, MHz indicator at 53.00 MHz, antenna

coupler simulator indicates 53.00 MHz.

18. If trouble exists, see troubleshooting chart 2-24, items 9 and 10.

19. Set control unit MODE SWITCH to OFF.

20. Set control unit frequency selectors to 70.00 MHz.

21. Set control unit MODE SWITCH to T/R.

22. Increase the frequency setting of control unit from 70.00 MHz to 75.00 MHz in 1 MHz steps.

STANDARD. The MHz indicator on box corresponds to selected frequency. Antenna coupler simulator

does not run.

23. If the performance of step 21 does not meet the standard, see troubleshooting chart 2-24,

item 8.

2-45