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TM 11-5820-401-34-3/0967-LP-432-3060
CRYSTAL REFERENCE SYSTEM (CRS) TEST.
5-15.
PURPOSE. This test is performed to make sure that the local oscillator will not be pulled off fre-
quency by a malfunctioning CRS. Steps 1 through 8 involve a quick check to determine whether the
CRS is putting out an incorrect error signal causing improper local oscillator frequency and loss of
audio tone. The remaining steps are done with the local oscillator disconnected from the CRS in order
to check CRS performance in response to a nonfluctuating 42.00-MHz signal generator output. If the
CRS passes the second part of the test, it will be able to correct normal fluctuation in local oscillator
frequency.
TEST EQUIPMENT AND MATERIALS
Matching Unit CN-901/U
Signal Generator AN/URM-103
T-Connector UG-274/U
Frequency Counter AN/USM-207
Loudspeaker LS-454/U
Power Supply PP-1104(*)/G
Multimeter ME-26(*)/U
Test Cable No. 1
Amphenol Adapter M-39012/16
Rf Cable RG-58/U
TEST SETUP. Connect the equipment as shown in test setup diagram -
. Remove R-442/VRC top
and bottom covers. (See paragraph 2-7.)
5-90


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