My new radios

Probably the most accurate way that I can think of would be to plug a cable into the external speaker Jack of the listening radio and run the other end of that cable directly to the input of a digital voice recorder so that you don't have the inaccuracies involved with the external speaker of the listening radio.
You would have to adjust the output volume of the listening radio down to a level acceptable for the input of the recorder. I have yet to do this but I'll probably do it pretty soon.

 

The guy that machined my shifter knob for my Chevy Tahoe is the same guy that builds antennas for the shop In Fontana California.

 

If you power a radio in your vehicle without connecting coaxial cable to the radio you can use it as a receiver to receive your transmitted signal.
you can turn the RF power down on the transmitting radio and you can turn the RF gain down on the receiving radio and plug your audio cable directly into the external speaker Jack of the receiving radio and connect that cable directly to your laptop or a digital voice recorder to make the recording but you need to adjust the output levels so that it is not distorting.
That's how this was done.

 

I tried to post a picture of my stainless shifter knob but I was having technical difficulties..

 

I finally got the recording levels adjusted correctly to eliminate distortion.

 

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Finally built a new PTT noise cancelling condenser that goes from 20hz to 16000hz. Response is tapered within the radio itself.








Housing is solid Bakelite with solid brass threaded inserts from a former Electro-Voice 603t.
Serial number 3,460