[App_rpt] audio setup issues with USB FOBs

Leon D. Zetekoff, NCE wa4zlw at backwoodswireless.net
Thu Apr 10 13:41:43 EDT 2008


Hi there…

We purchased a few of the DMK USB FOBs awhile back after homebrewing a few.

When I was down in Virginia at company HQ last month, I spent a few 
nights trying to make this work to no avail. We have an old IFR service 
monitor which I was using to generate tones and such. We’re using an 
Icom commercial repeater IC-FR3000/4000. The Icom has no internal 
controls for rx or txaudio that I can find (documentation is very slim).

Basically, rxtune doesn't want to work with the audio coming off the 
Icom repeater discriminator. I did not try deemphasized audio as I want 
to keep everything flat. In looking through some of the old posts we are 
seeing similar results whereby rxtune doesn’t see anything.

But oddly enough, if I used the HT to generate DTMF tones, the * box 
would detect them. The transmitted audio I could not get more than 2 or 
2.5 kHz deviation with the audio coming out of the * box.

As a side note, when we were using the homebrew USB FOBs we had louder 
digitally generated audio (didn’t have the service monitor then) than 
repeated audio.

Got any ideas to try?

Thanks leon wa4zlw




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