RECEIVER SENSITIVITY TEST. - TM-11-5820-401-34-30221

TM 11-5820 401-34-3/0967LP-432-3060

4-3.

RECEIVER SENSITIVITY TEST.

PURPOSE. This test checks the ability of the R-442/VRC to detect low-level rf signals by measuring

its SINAD at several frequencies. SINAD gives receiver sensitivity in terms of the following ratio:

signal + noise + distortion/noise + distortion.

SINAD is expressed in decibels. The better a receiver's SINAD, the better signals, even weak ones,

can be heard over unwanted internal noise. The SINAD for the R-442/VRC should be at least -10 db

(from a zero-db reference) when the rf level is 0.5 v

TEST EQUIPMENT AND MATERIALS

Power Supply PP-1104(*)/G

Test Set AN/GRM-114A

Maintenance Kit MK-1978/VRC

Rf Cable RG-58/U

TEST SETUP. Connect equipment as shown in test setup diagram

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