Procedure To Transmit; Alternate Microphones And Installation; 4 Wire Mic Cable - Ranger RCI-6900F HP Manual

2. Turn VOL. knob clockwise to apply power to the radio.
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 SQ knob slowly clockwise until the noise
just disappears. The SQ 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 receive gain.
8. Adjust the FINE/COARSE control to clarify the SSB signals or to optimize AM/FM signals.

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, depress 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).

4 WIRE MIC CABLE

Pin Number Mic Cable Lead
1 Audio Shield
2 Audio Lead
3 Transmit Control
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