Galaxy DX 29HP Manuale d'uso - Pagina 7

Sfoglia online o scarica il pdf Manuale d'uso per Ricetrasmettitore Galaxy DX 29HP. Galaxy DX 29HP 8. 10 meter amateur mobile transceiver

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 fourth lead is for receive control, and the third is for transmit 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.

Before beginning the actual wiring read carefully, the circuit and wiring

information provided with the microphone you select. Use the minimum head

required in soldering the connections. Keep the exposed wire lengths to a minimum

to avoid shorting when the microphone plug is reassembled.

Mic Cable Lead

Audio shield

Audio Lead

Transmit control

Receive Control

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Fig. 2 Microphone plug wiring

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 Fig. 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. If a vise or clamping tool is not available, the pin

receptacle body can be held in a stationary position by inserting it into the

microphone jack of the front panel. The numbers of the pins of the microphone

plug are shown in Fig. 3, as viewed from the back of the plug. Before soldering

the wire to the pins, pre-tin the wire receptacle of each pin of the plug.

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