Galaxy DX 919 Panduan Pemilik - Halaman 6

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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 the schematic below.

4 WIRE MIC CABLE

Pin Number

Fig. 1 Your transceiver microphone schematic.

If the microphone to be used is provided with pre-cut 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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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.

Fig. 2 Microphone plug wiring

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.

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