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RECEIVER AUDIO RESPONSE TEST(X-MODE). |
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|  TM 11-5820-401-34-3/0967-LP-432-3060
4-9. RECEIVER AUDIO RESPONSE TEST(X-MODE).
PURPOSE. This test is similar to the R-442/VRC Receiver Audio Response Test (Normal Mode).
When setup for X-mode, however, the R-442/VRC responds to a wider band of frequencies because
the A5000 tray is not used. The ability of the R-442/VRC to detect and respond flatly to the desired
intelligence is verified by:
1. Injecting 1-kHz modulation into the R-442/VRC ANTENNA port while measuring the voltage at
the MK-1978/VRC X-MODE AUX RCVR jack.
2. Changing the modulation rate to 500 Hz, 3 kHz, 5 kHz, and 10 kHz, while taking db readings
at the MK-1978/VRC X-MODE AUX RCVR jack.
3. Comparing the db readings taken in step 2 to the reference voltage taken in step 1 to see
if the standard is met.
R-442/VRC X-MODE SETUP PROCEDURE
1.
Remove bottom cover from R-442/VRC. (See paragraph 2-7.)
2.
Raise A4000 tray and secure brace.
Remove Filter FL4002.
3.
4.
Rotate Filter FL4002 180 degrees.
5.
Put Filter FL4002 back into tray.
6.
Set X-MODE-NORMAL Switch S4001, located underneath A4000 tray, to X-MODE position.
7.
Release brace and lower A4000 tray.
8.
Replace R-442/VRC bottom cover.
TEST EQUIPMENT AND MATERIALS
Test Set AN/GRM-114A
Power Supply PP-1104(*)/G
Rf Cable RG-58/U
Maintenance Kit MK-1978/VRC
4-22
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