TEST PROCEDURE 050 RADIO SET AN/PRC-77 SERIES

SB 740-91-01

TEST PROCEDURE 050

RADIO SET AN/PRC-77 SERIES

5820-00-930-3724

1. General.

This procedure provides a description of special test equipment, fixturing, cabling, instrumentation and instructions for

performing inspections and evaluations applicable to the Radio Set AN/PRC-77, which consists of the following type

designated items:

5820-00-086-7138

Bag, Cotton Duck CW-503/PRC-25

5820-00-085-7148

Battery Box CY-2562/PRC-25

5820-00-086-7149

Support Antenna AB-591A/PRC

5820-00-242-4967

Antenna AT-271A/PRC

5820-00-889-3803

Antenna AT-892/PRC-25

Receiver-Transmitter Radio RT-841/PRC-77

Handset H-189/GR may be used in lieu of H-189/GR

5965-00-043-4386

Handset H-250/U

5999-892-8094

Harness, Electrical Equipment ST-138/PRC-25

2. Test Equipment/Test Setup.

All tests are to be performed under the following environmental conditions, unless otherwise stated:

230 “ 100C (730“ 180F).

Temperature:

Relative Humidity:

50 30 percent.

All test equipment is to be energized for at least 30 minutes prior to utilization, unless otherwise specified in operating

manual for the test equipment.

All tests are to be performed in an electromagnetic shielded enclosure, if in a high RF field of interference.

The radio should be preconditioned by turning it on and exercising the band switch kHz and MHz knobs and verifying that

all controls are functioning properly. In the squelch and retransmit position, the radio should not become unsquelched due

to noise (i.e., no signal present). One frequency in the "A" band and one frequency in the "B" band frequency ranges are

sufficient for this test.

NOTE

No transmitter sidetone will be heard in the retrans mode. A 10 volt input can be used if a regulated power

supply is available, or a battery may be employed.

Table D-3 lists the test equipment. Figures B-10 through B-14 illustrate the various test setups.

B-53