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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I’m having trouble setting the receive audio input level to interface with a Motorola Radius radio.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m using a USB FOB modified as shown on <a href="http://www.crompton.com/hamradio/usb_fob_modification/">http://www.crompton.com/hamradio/usb_fob_modification/</a> , 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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What audio level directly into the FOB, after the voltage divider shown in the mod, is correct for decent tuning range?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cole Cunningham<o:p></o:p></p><p class=MsoNormal>AA7RD<o:p></o:p></p></div></body></html>