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PROCEDURE TO RECEIVE AND TRANSMIT 

 

REAR PANEL 

 

A. MICROPHONE 

 

 

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M

A

D

E

 IN

 TAIW

A

N

1

2

ANT.

EXT.SP.

_

PA.SP.

+

POWER

3

4

The push-to-talk switch on the microphone controls the receiver and transmitter. Press 

the switch and the transmitter is activated, release switch to receive. When transmitting, 
hold the microphone two inches from your mouth and speak clearly in a normal voice. 
This transceiver comes complete with a low impedance dynamic microphone.  
 

B.  PROCEDURE TO RECEIVE 

1.  Be sure that power source, microphone and antenna are connected to the proper 

connectors before going to the next step. 

 
2. Turn 

VOL

 knob clockwise to apply power to the radio.  

 
3. Set 

the 

VOL

 for a comfortable listening level. 

 
4. Set 

the 

MODE

 switch to the desired mode.   

 
5.  Listen to the background noise from the speaker. Turn the 

SQ

 knob slowly 

clockwise until the noise just disappears. The 

SQ

 is now properly adjusted. The 

receiver will remain quiet until a signal is actually received. Do not advance the 
control too far or some of the weaker signals will not be heard. 

 

 

 

1. ANTENNA:

 This jack accepts a 50 ohm coaxial cable with a PL-259 type plug. 

6. Set 

the 

CHANNEL

 selector switch to the desired channel. 

 

 

2. DC 

POWER:

 This jack accepts the 13.8V DC power cable with built-in fuse. The 

power cord provided with the radio has a black and red wire. The black goes to 
negative and red goes to positive.  

7. Set 

the 

RF GAIN

 control fully clockwise for maximum RF gain. 

 

C.  PROCEDURE TO TRANSMIT 

 

1.  Select the desired channel of operation. 

3. PA 

SP:

 This jack is for PA operation. Before operating, you must first connect a 

PA speaker (8 ohms, 4W) to this jack. 

 
2. Set 

the 

MIC GAIN

 control fully clockwise. 

 

 

4. EXT. SP:

 This jack accepts a 4 to 8 ohm, 5 watt external speaker. When the 

external speaker is connected to this jack, the built-in speaker will be disabled. 

3.  If the channel is clear, depress the push-to-talk switch on the microphone and speak 

in a normal voice. 

 

 

 

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Summary of Contents for DX 48T

Page 1: ...TENTS PAGE CHAPTER 1 Specifications 2 CHAPTER 2 Installation 3 Installing The Radio 3 Ignition Noise Interference 4 Antenna 4 External Speaker 4 Public Address 4 CHAPTER 3 Operation 5 Front Panel 5 Re...

Page 2: ...installed Make sure nothing will interfere with either the radio or the mounting bolts Mark and then drill holes for the mounting bracket 2 Most radio antennas come equipped with a PL 259 plug Connect...

Page 3: ...S 1 MICROPHONE JACK Used to connect microphone for voice source To use the Public Address PA function first connect an external speaker to the PA SP Jack on the rear of the radio See the above specifi...

Page 4: ...allows the user to monitor signal strength RF output power SWR level and AM modulation level 22 RX TX LED The red LED indicates the unit is in the transmit mode The green LED indicates the unit is in...

Page 5: ...SQ is now properly adjusted The receiver will remain quiet until a signal is actually received Do not advance the control too far or some of the weaker signals will not be heard 1 ANTENNA This jack ac...

Page 6: ...and fourth is for receiving control The microphone should provide the functions shown in the schematic below 4 WIRE MIC CABLE Pin Number Mic Cable Lead 1 Audio Shield 2 Audio Lead 3 Transmit Control 4...

Page 7: ...ure 2 are pushed back onto the microphone cable before starting to solder If the washer is not captive to the pin receptacle body make sure that it is placed on the threaded portion of the pin recepta...

Page 8: ...Please include a note with a detailed description of the symptoms This is important because it will help the technician who works on your radio to locate your problem Intermittent problems are easily...

Page 9: ...Printed in Taiwan AT0949011D...

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