Table 4-10. CROSSTALK TESTS, TRANSMITTING AND RECEIVING CIRCUITS

TM 11-5895-1141-34

Step

Operation

Normal Indication

Transmitting Crosstalk Test. Preliminary

test set-up. The system installation must

be complete and the transmitting circuit

adjustments of chapter 3, section II must

be completed.

a. Connect the audio signal source to

J301 and J302 of the jack panel as shown

in test figure 4-6.

b. Disconnect the lines to the radio

transmitters where they first enter the

radio channel control system wiring.

Terminate each transmitting audio line

pair with a 600 ohm 1%, 1/2 watt

resistor.

c. Connect the ac voltmeter to the

600 ohm termination of the first channel.

d. Set the channel select switch of the

first channel selector module to the LOCK

position. Leave all remaining channel

selector switches in the OFF position.

Set the audio signal input level to

Record the meter reading at the output

1.26 volts and 1000 Hz corresponding to an

termination of Step 1c.

input level of +9 dBm. Close the trans-

mitter keying switch.

4-21