[arm-allstar] USB FOB Problem

[AD2DX]

I had another USB FOB, so I modified it. Works fine, so the first FOB I modified was bad.
73,
Joe - AD2DX



On Apr 7, 2016, at 10:59 PM, Doug Crompton via arm-allstar <arm-allstar at hamvoip.org<mailto:arm-allstar at hamvoip.org>> wrote:

Joe,

 Obviously you have an audio problem. A scope would fine it in an instant but you could signal trace with an amplifier and speaker. If audio is getting to the FOB chip then you might have a bad FOB. It has been known to happen. The FOB is working with outbound audio? The FOB green LED is blinking properly?  Having no audio at all with rxboost=1 and levels turned up to max would possibly indicate a short somewhere in the audio path.

73 Doug
WA3DSP
http://www.crompton.com/hamradio


> To: arm-allstar at hamvoip.org<mailto:arm-allstar at hamvoip.org>
> Date: Fri, 8 Apr 2016 00:20:41 +0000
> Subject: [arm-allstar] USB FOB Problem
> From: arm-allstar at hamvoip.org<mailto:arm-allstar at hamvoip.org>
> CC: ad2dx at ad2dx.us<mailto:ad2dx at ad2dx.us>
>
> I built a USB Sound FOB Interface. Everything works fine except when I go into simpleusb-tune-menu 2) Set RX Voice Level, and speak into the mic on the radio that is transmitting to the node radio, I can see the > sign, but no audio. When I unkey, the > sign disappears, so I know that it is seeing something. I shut down and replace the USB FOB with my URi, all is well.
>
> On the schematic “USB FOB simplified schematic.pdf”, I used a 10uF electrolytic cap in the RX Audio line, along with a 47K resistor, and a 68K to ground at that junction, just like it is in the schematic. The polarization of the cap has been verified. For kicks, I tacked another 47K in parallel with the 47K, but no change. I do not have a scope. Any ideas?
>
> 73,
> Joe - AD2DX
>
>
>
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