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D.  Try a different location on your car (keeping in mind the radiation pattern 

you wish) 

 

E.  Is the antenna perfectly vertical? 

 

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

metal objects when adjusting (metal telephone or light posts, fences, etc.). 

 

 

 
 
 
 

 

EXTERNAL SPEAKER 

The external speaker jack (EXT.SPK) 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. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Operation 

 

CONTROL FUNCTIONS 

There are thirteen controls and three indicators on the front panel of your 

transceiver. 

 

 

FRONT PANEL 

 

1.  OFF/ON/VOLUME (inner dual concentric). 

Turn clockwise to apply power 

to the unit and to set the desired listening level. During normal operation, the 
VOLUME control is used to adjust the output level obtained either at the 
transceiver speaker or the external speaker, if used. 

 
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 control be adjusted only to 
the point where the receiver background noise or ambient backgrounds noise is 
eliminated. Turn fully counterclockwise 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 a maximum clockwise setting.   

 

3.  MIC GAIN (inner dual concentric).

 Adjust 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. 

 

4.  RF GAIN CONTROL (outer dual concentric). 

Use to reduce the gain of the 

RF amplifier under strong signal conditions. 

 

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. 

- 8 - 

- 7 - 

NOTE 

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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