Galaxy DX 949 Manual del usuario - Página 9

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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 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.

5. The wires must now be soldered to the pins as indicated in the above

wiring tables. If a vise or clamping tool is available it should be used to

hold the pin receptacle body during the soldering operation, so that both

hands are free to perform the soldering.

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