[arm-allstar] Receiver audio levels

[Cole Cunningham]

I'm having trouble setting the receive audio input level to interface with a
Motorola Radius radio.

 

I'm using a USB FOB modified as shown on
http://www.crompton.com/hamradio/usb_fob_modification/ , and connecting to
the audio output of the radio on the rear connector I am unable to set the
proper level using simpleusb-tune-menu.  Even going all the way to 0 isn't
enough.  The peak to peak voltage out of the radio with 1kHz audio/3 kHz
deviation is 1.2 volts.  I have confirmed that it is truly sensing the audio
by shutting the modulation off and seeing the tune indicator line go to
about 500 Hz of noise.

 

What audio level directly into the FOB, after the voltage divider shown in
the mod, is correct for decent tuning range?

 

Cole Cunningham

AA7RD

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