LOCAL OSCILLATOR A1500 ALTERNATE ALINEMENT PROCEDURE.

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

LOCAL OSCILLATOR A1500 ALINEMENT. (CONT)

5-16.

10. Adjust L1501 (4) for clear audio tone and zero-volt reading on ME-26(*)/U. (See test setup

diagram

11. Set R-442/VRC to 42.00 MHz and AN/URM-103 to 42 MHz.

12. Repeat steps 2 through 10 to make sure that local oscillator tracks with no more than 0.5-vdc

error signal required in any of the three test frequencies.

NOTE

If the ME-26(*)/U indicates more than + 0.5 vdc or less than -0.5 vdc in any frequency,

and repetition of steps 2 through 10 does not correct the problem, replace the A1500

assembly.

5-17.

LOCAL OSCILLATOR A1500 ALTERNATE ALINEMENT PROCEDURE.

PURPOSE. This procedure permits alinement of the local oscillator without the use of a signal

generator. The frequency of the local oscillator is checked directly with a counter; therefore, the

presence of an audible audio tone is not important. Thus, alinement does not depend on the per-

formance of the A4000 or A5000 sections of the receiver. The CRS Test (paragraph 5-15) must be

done prior to performing this alinement.

TEST EQUIPMENT AND MATERIALS

Multimeter ME-26(*)/U

Frequency Counter AN/USM-207

One extra SMC rf cable

Amphenol Adapters (two) M-39012/16

T-Connectors (two) UG-274/U

TEST SETUP. Connect equipment as shown in test setup diagram

5-96