background image

 

 

Fig. 2

 Microphone plug wiring 

 

4.  Remove the retaining screw 

 

5.  Unscrew the housing from the pin receptacle body 

 

6.  Loosen the two cable clamp retainer screws. 

 

7.  Feed the microphone cable through the housing, knurled ring and washer as 

shown Fig. 2. 

 

8.  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. 

 
 
 
 

Specifications 

 

GENERAL 

 

Frequency Range 

28.065 to 28.505 MHz 

Frequency Control 

Phase Lock Loop (PLL) synthesizer. 

Frequency Tolerance 

0.005% 

Frequency Stability 

0.001% 

Operating Temperature 
Range 

-30 

°

C to +50 

°

C. 

Microphone 

Plug-in dynamic; with push-to-talk switch and 
coiled cord. 

Input Voltage 

13.8V DC nominal, 15.9V max, 11.7V min. 
(Positive or negative ground). 

Transmit: 

AM full mod., 2.2A. 

Receiver:

 Squelched, 0.3A. 

                Maximum Audio output, 0.7A. 

Size 

2-3/8” (H) x 7-7/8” (W) x 9-1/4” (D). 

Weight 5 

Ibs. 

Antenna Connector 

UHF, SO239 

Meter 

Illuminated; indicates relative output power, 
received signal strength. 

 

 

TRANSMITTER 

 

Power output 

AM/FM, High-7 watts 
Low-3.5 watts 

Modulation High-and 

low-level Class B, Amplitude 

Modulation: AM. Variable capacitance 
Frequency Modulation: FM. 

Spurious Emissions 

60 dB 

Frequency Response 

AM and FM: 450 to 2500 Hz. 

Output Impedance 

50 ohms, unbalanced 

Output Indicators 

Meter shows relative RF output power and 
SWR. Transmit LED glows red when 
transmitter is in operation. 

 

 

 

 

 

 

 

 

 
 
 
 

 

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Summary of Contents for DX−33HML

Page 1: ...s on your radio to locate your problem Intermittent problems are easily overlooked so be sure to give as much detail as possible in your note Also please include your telephone number in case our tech...

Page 2: ...r and be careful to prevent excessive solder accumulation on pins which could cause a short between the pin and the microphone plug housing 1 When all soldering connections to the pins of the micropho...

Page 3: ...the wire receptacle of each pin of the plug Specifications GENERAL Frequency Range 28 065 to 28 505 MHz Frequency Control Phase Lock Loop PLL synthesizer Frequency Tolerance 0 005 Frequency Stability...

Page 4: ...one 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 lea...

Page 5: ...nt for operation and does not interfere with the driver or passengers in the vehicles In automobiles the transceiver is usually mounted below the dash panel with the microphone bracket beside it MOUNT...

Page 6: ...le as a ground plane When mounted at a corner of the vehicle they are slightly directional in the direction of the body of the vehicle For all practical purpose however the radiation pattern is nondir...

Page 7: ...ection will strictly concern itself to the various types of mobile adjustable antennas Because the antenna length is directly related to the channel frequency it must be tuned to resonate optimally al...

Page 8: ...2 SQUELCH outer dual concentric This control is used to cut off or eliminate receiver background noise in the absence of an incoming signal For maximum receiver sensitivity it is desired that the con...

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