Table 4-10. CROSSTALK TESTS, TRANSMITTING AND RECEIVING CIRCUITS (Cont'd)

TM 11-5895-1141-34

Step

Operation

Normal Indication

Remove the ac voltmeter from the termina-

The crosstalk level should be at least 50 dB

tion of the first channel and connect it

below the signal level of the active channel.

in turn to each of the other channels

used. Read the crosstalk level.

Connect the ac voltmeter across the loud-

The loudspeaker reading should not exceed

speaker terminals. On each channel in

1 mv.

turn, set the receive select switch to the

Loudspeaker position. Measure the cross-

talk between the transmitting and receiv-

ing circuits.

Repeat steps 2, 3, 4 with each of the

receiving channels.

Receiving Crosstalk Test. Preliminary

test set-up.

a. Disconnect the audio line pair from

the radio receiver where they first eater

the radio channel control system wiring.

Connect the audio signal source in the

receiving test figure 4-4 to the received

input signal of the first channel.

b. Replace the 600 ohm simulated load

with a 50 ohm, 1% resistor.

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