CRYSTAL REFERENCE SYSTEM (CRS) TEST. - TM-11-5820-401-34-30454

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