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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).
(c) Energize all test equipment. On the RT-246/VRC
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

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