Table 4-7. TESTING RECEIVER CIRCUITS TEST PROCEDURE (Cont'd)

TM 11-5895-1141-34

Step

Operation

Normal Indication

Disconnect the audio oscillator and place

The noise voltage should not exceed 1 mv.

a short circuit across the attenuator of

test circuit. Measure the noise voltage

across the loudspeaker terminals using the

Reconnect the audio oscillator and remove

The output across the loudspeaker should not

the short circuit across the attenuator.

exceed 1.1 v. Record the output voltage

Repeat step 7.

Set the channel select switch to the LOCK

Read and record the output voltage across the

position and close the transmitter keying

loudspeaker terminals. The reading should be

switch. The output from the loudspeaker

no more than 0.32% of the reading recorded in

should significantly decrease.

step 11.

For each additional channel used repeat

step 1 through 11. Refer to figure FO-15

for connections to J201 and J202 for

received signal input on other channels.

Remove the test instruments and the test

plug of the test figure 4-4. Remove the

600 ohm load.

4-10