Electrical Tests. - SB-740-91-010223

SB 740-91-01

4. Electrical Tests.

The following tests are to be performed, using the applicable data sheet (figure B-6), for Receiver-Transmitter units RT-

524/VRC, RT-524A/VRC, RT-246/VRC and RT- 246A/VRC.

Step

Setting and Instructions

Normal Indication

1 Transmitter RF power output

(a)

Connect the test equipment in accordance with

(b)

Set the PP-1104/G output voltage to 25.5 VDC.

NOTE

This voltage must be maintained during all

transmission tests (radio keyed).

or RT-524/VRC, set the controls as follows:

(1) Power Switch. Low

(2) Light Switch. On

(3) Band Switch. A 30-52

(4) MC-TUNE-KC. 30.0 MHz

(5) Squelch. Old off

(6) Volume. Maximum counterclockwise

(7) Speaker. Off (RT-524/VRC only)

(d) Set AN/URM-120 to read 10 W.

(e) Press M-80/U push-to-talk switch.

(f) Record output power as indicated by AN/URM-120.

The reading should be

between 0.5 and 10 W.

(g) Set the AN/URM-120 to read 100 W.

(h) Set the RT-246/VRC or RT-524/VRC power switch

to HIGH.

(i) Press M-80/U push-to-talk switch.

(j) Record output power as indicated by AN/URM-120.

The reading should be

between 30 W min and

no max .

(k) Repeat steps (d) through (j) with MC-TUNE-DC

controls set to 42.0 and 52.0 MHz. Set band

switch to B 53-75 and repeat steps (d) through

(j) with MC-TUNE-KC controls set to 30.05, 52.95,

53.05, and 75.95 MHz.

2 Squelch Sensitivity

(a) Noise (Old) operated squelch

(1) Connect the test equipment in accordance

B-35