Communications Radio User Manual

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2.3 OPERATION

2.3.1 PROCEDURE TO RECEIVE

1. Be sure that power source, microphone and antenna are connected to the proper connectors before

going to the next step.

2. Turn unit on by turning

VOL

knob clockwise on transceiver.

3. Set the

VOL

to a comfortable listening level.

4. Set the

MODE

switch to the desired mode.

5. Listen to the background noise from the speaker. Turn the

knob slowly clockwise until the noise

just disappears. The

is now properly adjusted. The receiver will remain quiet until a signal is

actually received. Do not advance the control too far or some of weaker signals will not be heard.

6. Set the

CHANNEL

selector switch to the desired channel.

7. Set the

RF GAIN

control fully clockwise for maximum RF gain.

2.3.2 PROCEDURE TO TRANSMIT

1. Select the desired channel of transmission

2. Set the

MIC GAIN

control fully clockwise.

3. If the channel is clear, press the push-to-talk switch on the microphone and speak in a normal voice.

2.4 ALTERNATE MICROPHONES AND INSTALLATION

For best results, the user should select a low impedance dynamic type microphone or a transistorized

microphone. Transistorized type microphones have a low output impedance characteristic. The

microphones must be provided with a four-lead cable. The audio conductor and its shielded lead

comprise two of the leads. The third lead is for transmit control and the fourth is for receiving control.

The microphone should provide the functions shown in schematic below (Figure 2-3).