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* PMR 446 to PC audio connections...
Posted Apr 06, 2003 - 09:19 PM
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Hardwired If you are disappointed with the audio quality of your RF Gateway, and the mixer levels from your PC to the PMR446 radio are quite low or you are suffering from over modulation or distortion it may be that the level from your PC output needs attenuating. Help is at hand here...

Some soundcards put out quite high levels from the speaker output that plugs into your radio's Mic socket (designed for a microphone which is a very low level signal). The result of this is distortion.

A good solution to this problem is to make an attenuator.

The good news is it will cost less than a pound and give good adjustability of the level going to your radio. This has vastly improved the audio going out over RF at my end with the Binatone roamaround 100.

Example screen grabs of my mixer levels before and after the attenuator:-

Poor levels o­n the mixer 

Notice the master level and wave levels are right at the bottom almost as low as they can get.

Levels are better

The master and wave are at a much better level o­nce the attenuator is in place - the result is less noise and more signal.

The attenuator:-

Part required

Log Pot 100K - Maplins VQ04E 100K Log 16mm ECO Price 0.99

Suitable wire and connectors (I just cut my original cable and put the attenuator in a convenient place).

Wire up as follows:-

Wiring it up

Alternatively you could just use a couple of resistors o­nce you have found the values you require for your setup and save the 100k Pot for another project.

As always your milage may vary depending o­n your particular radio.

Dr. Rob
(With credit to Andy for the original idea!)

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