Galaxy DX 979 Посібник користувача - Сторінка 7

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Thus when a voice is used in place of a whistle or tone, in the proper listening mode

the voice will be received correctly whereas in the incorrect mode, the voice will be

translated backwards and cannot be made intelligible by the CLARIFIER control.

When listening to an AM transmission, a correct side band is heard in either mode

since both upper and lower side bands are received.

Once the desired SSB mode has been selected, frequency adjustment may be

necessary in order to make the incoming signal intelligible. The CLARIFIER control

allows the operator to vary frequency above or below the exact frequency of the

channel. If the sound of the incoming signal is high or low pitched, adjust the

operation of the CLARIFIER.

Consider it as performing the same function as a phonograph speed control. When

the speed is set too high, voices will be high-pitched and if set too low, voice will be

low-pitched. Also, there is only one correct speed that will make a particular record

produce the same sound that was recorded. If the record is played on a turntable that is

rotated in the wrong direction (opposite side band) no amount of speed control

(CLARIFIER) will produce an intelligible sound.

An AM signal received while listening in one of the SSB modes will produce a

steady tone (carrier) in addition to the intelligence, unless the SSB receiver is tuned to

exactly the same frequency by the CLARIFIER control. For simplicity, it is

recommended that the AM modes be used to listen to AM signals.

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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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