AUDIOFREQUENCY RESPONSE AND FRONT PANEL METER TEST.

TM 11-5820-670-30

2-5. AUDIO POWER OUTPUT AND DISTORTION TEST. (CONT)

4. Tune signal generator AN/URM-103 to 60.05 MHz as indicated by maximum indication on

TS-723/U meter.

STANDARD. 2.17 to 3.45 vrms (5 mw 2 db)

5. If TS-723A/U meter does not indicate between specified limits, see troubleshooting

chart 2-6.

6. Disconnect jumper between AF INPUT and METER terminals on TS-723A/U. Read audio distor-

tion in percentage.

NOTE

Tune the AN/URM-103 slightly for minimum distortion as indicated on the TS-723A/U.

STANDARD. Maximum 8 percent

7. If indication on TS-723A/U meter reads above 8 percent, see troubleshooting chart 2-7.

2-6. AUDIOFREQUENCY RESPONSE AND FRONT PANEL METER TEST.

PURPOSE

This test checks the frequency response of the radio set in the 300 Hz to 10 kHz range. The flatness of

the band in this frequency range should be within 2 db.

TEST EQUIPMENT AND MATERIALS

Maintenance Kit MK-1035/ARC-131

Signal Generator AN/URM-103

Signal Generator AN/URM-127

Spectrum Analyzer TS-723A/U

Power Supply PP-2953/U

All cables are part of MK-1035/ARC

TEST SETUP

Connect equipment as shown in test setup diagram. Turn on all test equipment and allow at least

5 minutes for warmup.

2-8