Galaxy DX-939 Manuel du propriétaire - Page 4

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If you're having difficulties in adjusting your antenna, check the following:

All doors must be closed when adjusting the antenna

b. Make sure the antenna base is grounded.

Check your coaxial cable routing (it may be pinched when routed into the car)

d. Try a different location in your car (keeping in mind the radiation pattern you

wish.)

Is the antenna perfectly vertical?

Try a different location in your neighborhood. Stay away from large metal

objects when adjusting (metal telephone or lamp post, fences, etc.)

The transceiver will operate into an SWR of 2 to 1

indefinitely and sustain an SWR of 20 : 1 for a maximum

of 5 minutes at rated operating conditions.

EXTERNAL SPEAKER

The external speaker jack (EXT SP.) on the rear panel is used for remote receiver

monitoring. The external speaker should have 8 ohms impedance and be able to

handle at least 4 watts. When the external speaker is plugged in, the internal

speaker is disconnected.

PUBLIC ADDRESS

To use the transceiver as a public address system, connect an external 8 ohms

speaker (4 watts minimum) to the PA. SP. jack located on the rear panel. Direct

speaker away from the microphone to prevent acoustic feedback. Physical

separation or isolation of the microphone and speaker is important when operating

the PA at high output levels.

NOTE

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CHAPTER 3 OPERATION

CONTROL FUNCTIONS

FRONT PANEL

1. ON/OFF VOLUME CONTROL : Turn clockwise to apply power to the radio

and to set the desired listening level.

2. SQUELCH CONTROL : This control is used to control or eliminate receiver

background noise in the absence of an incoming signal. For maximum receiver

sensitivity, it is desired that the control be adjusted only to the point where the

receiver background noise is eliminated. Turn fully counter-clockwise, then

slowly clockwise until the receiver noise disappears. Any signal to be received

must now be slightly stronger than the average received noise. Further

clockwise rotation will increase the threshold level which a signal must

overcome in order to be heard. Only strong signals will be heard at maximum

clockwise setting.

3. MIC GAIN CONTOR : Adjusts the microphone gain in the transmit and PA

modes. This controls the gain to the extent that full talk power is available

several inches away from the microphone. In the PUBLIC ADDRESS (PA)

mode, the control functions as the volume control.

4. RF GAIN CONTROL : This control is used to reduce the gain of the receive

amplifier under strong signal conditions.

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