Microphone; Procedure To Receive; Procedure To Transmit; Alternate Microphones And Installation - Galaxy DX 959 Service Manual

microphone two inches from the mouth and speak clearly in a normal voice. The radio comes
complete with low impedance (500 ohm) dynamic microphone. For installation instructions of the
microphone, see section "ALTERNATE MICROPHONES AND INSTALLATION".
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 running 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 SQ knob slowly clockwise until the
noise just disappears. Leave the control at this setting. This 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.

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 receive 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
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