Table 4-10. CROSSTALK TESTS, TRANSMITTING AND RECEIVING CIRCUITS
Transmitting Crosstalk Test. Preliminary
test set-up. The system installation must
be complete and the transmitting circuit
adjustments of chapter 3, section II must
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
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.