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OPERATION
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 low output impedance
characteristics. 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 fourth is for receiving control.
The microphone should provide the functions shown in schematic below.
4 WIRE MIC CABLE
Pin Number
1
2
3
4
Fig. 1 Your transceiver microphone schematic.
If the microphone to be used is provided with precut leads, they must be revised as
follows.
1. Cut leads so that they extend 7/16" beyond the plastic insulating jacket of the
microphone cable.
2. All leads should be cut to the same length. Strip the ends of each wire 1/8" and tin the
exposed wire.
Mic Cable Lead
Audio Shield
Audio Lead
Transmit Control
Receive Control
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OPERATION
A
Before beginning the actual wiring, read carefully the circuit and wiring information
provided with the microphone you select. Use the minimum heat required in soldering the
connections. Keep the exposed wire lengths to a minimum to avoid shorting when the
microphone plug is reassembled.
To wire the microphone cable to the plug provided, proceed as follows :
1. Remove the retaining screw.
2. Unscrew the housing from the pin receptacle body.
3. Loosen the two cable clamp retainer screws.
4. Feed the microphone cable through the housing, knurled ring and washer as shown
Figure 2.
Fig. 2 Microphone plug wiring
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A
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