TRANSMITTER SIDETONE TEST.

TM 11-5820-670-30

2-17. TRANSMITTER AUTOMATIC FREQUENCY SELECTION AND CHANNEL CHANGING TONE

TEST. (CONT)

TEST PROCEDURE

1. Set frequency selectors to 30.00 MHz and allow radio set to tune; then set MODE SWITCH to

OFF.

2. Change frequency selectors to 75.00 MHz and set MODE SWITCH to T/R.

3. Using a stopwatch, measure time required for tuning.

STANDARD. 7 seconds maximum

4. If radio set takes longer than 7 seconds to tune, see troubleshooting chart 2-20.

5. Monitor test set speaker for 800 Hz tone during tuning process.

STANDARD. Tone present

6. If no tone was present during tuning process, see troubleshooting chart 2-20.

7. Repeat steps 1 through 6 adjusting the frequency selector switches on test set for the following

frequencies.

INITIAL TEST SET

WITH MODE SWITCH OFF,

FREQUENCY

CHANGE TO:

75.00 MHz

30.00

MHz

46.00

MHz

45.00 MHz

45.00

MHz

46.00 MHz

50.95

MHz

50.00 MHz

50.00

MHz

50.95 MHz

31.00

MHz

30.00 MHz

30.00

MHz

31.00 MHz

2-18. TRANSMITTER SIDETONE TEST.

PURPOSE

This test checks the power level of the sidetone signal generated in the rt when fm rf is transmitted.

TEST EQUIPMENT AND MATERIALS

Maintenance Kit MK-1035/ARC-131

Fuseholder MX-1730/U

Power Supply PP-2953/U

Signal Generator AN/URM-103

Signal Generator AN/URM-127

Spectrum Analyzer TS-723A/U

All cables are part of MK-1035/ARC

2-35