Transmitter Frequency Stability Test

TM 11-5820-509-35

Test

Radio

equipment

control

Test

Performance

Step

settings

procedures

standards

a. Set switch on antenna

a. Adjust KILOCYCLES

a. Repeat step 1a.

a. Same as step 1a.

simulator to 11,999 kHz

indicator to 11999; place

position.

OPR-TUNE switch to

TUNE.

b. n/a

b. Immediately return

b. n/a

OPR-TUNE switch to

OPR.

a. Same as step 3a.

a. Place XMTR PWR

a. Same as step 1a.

switch to HI; then place

OPR-TUNE to TUNE.

b. n/a

b. Immediately return

b. n/a

OPR-TUNE to OPR; and

place XMTR PWR to LO.

4-16. Transmitter Frequency Stability Test

(1) Connect the test equipment to Radio

(fig. 4-5)

Receiver-Transmitter RT-671/PRC-47 as shown in

figure 4-5.

a. Test Equipment and Material.

(2) Connect the primary power source to the

(1) Oscillator TS-382/U

receiver-transmitter.

(2) Dummy Load DA-75/U

(3) Turn on the test equipment and place the

(3) Frequency Counter AN/URM-79/U

POWER-LIGHTS switch on RT-671/PRC-47 to POWER

(4) Output attenuator (fig. 4-5)

ON. Permit the equipment to stabilize at least 5

(5) Blocking capacitor (fig 4-5) 4-6 Primary

minutes before beginning the procedures shown in the

power source: 26.5-volt, dc, 11 amperes approx.

chart below.

b. Test Conditions and Equipment Connections.

Figure 4-5. Transmitter Frequency Stability Test, Equipment Setup

FSK/VOICE switch to VOICE, the XMTR PWR switch to

c. Procedure.

LO, and the OPR-TUNE switch to OAR.

(1) On RT-671/PRC-47, set the

KILOCYCLES indicator to 9900: set CW-

4-14