Transmitter Frequency Test - TM-11-6625-667-450118

5-3. Transmitter Frequency Test

a. Test Equipment Required

(1) Frequency Meter AN/USM-207.

(2) Comparator, Frequency CM-77A/USM.

b. Test Connections and Conditions. Connect the equipment as shown in figure 5-1. Connect A4TP5 to ground.

c. Procedure.

Control settings

Test

Performance

Equipment under

test

Step

Test equipment

procedure

standard

AN/USM-207

a. Turn on the AN/USM-207 and CM-

MODE: 1

a. None.

DIRECT/HETRODYNE

FUNCTION: SYSTEM.

77A/USM. Permit a l-hour warmup.

Switch: HETRODYNE

CODE: Any.

b. Turn on the test set, and permit a 2-

b. None.

VOLTAGE Switch: 10V

POWER 115 vac or 28 vdc, as

minute warmup.

FREQ TUNING-MC: 150

c. None.

c. Press the PRESS-TO-TEST switch and

applicable.

POWER TRACK

turn to LOCK.

FUNCTION: FREQ

SENSITIVITY: Plug in

CM-77A/USM

a. Adjust the CM-77A/USM FREQUENCY

a. None.

FREQUENCY MEGACYCLES: 206.

MEGACYCLES

and

VIDEO

VIDEO RESEONSE-GAIN: CW.

R E S P O N S E c o n t r o l s until

the

RESPONSE-HIGH

VIDEO

oscilloscope display indicates zero

FREQUENCY: CCW.

beating (setting should be near 206).

b. 1,030 mc 206 kc.

b. Note the frequency on the AN/USM-207

add 150 to it and multiply the results

by 5.