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12

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 

Mic Cable Lead 

1 Audio 

Shield 

2 Audio 

Lead 

3 Transmit 

Control 

4 Receive 

Control 

 
 

 

 

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. 

 

 

13

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. 

Содержание DX 94HP

Страница 1: ...OF CONTENTS 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 Pane...

Страница 2: ...n the location where the radio is to be 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...

Страница 3: ...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 Public Address PA function first connect an ext...

Страница 4: ...ed As a courtesy to others use the Roger Beep only when necessary When the switch is in the SWR position the meter indicates the Standing Wave Ratio SWR of your antenna There are no adjustments becaus...

Страница 5: ...ly 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 conne...

Страница 6: ...eased whereas in the LSB mode the transmitter s output frequency is decreased The result in listening to the receiver is that when the MODE switch is in the proper position either USB or LSB a true re...

Страница 7: ...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 th...

Страница 8: ...he connections to pin 1 and 3 are made first and then the connections to pins 2 and 4 Use a minimum amount of soldering and be careful to prevent excessive solder accumulation on pins which could caus...

Страница 9: ...16 MEMO 17 MEMO...

Страница 10: ...gest calling between 10 00 AM and 4 00 PM Pacific Time z 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...

Страница 11: ...20 Printed in Taiwan ATDX98010C...

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