[arm-allstar] USB FOB Problem

[David McGough]

I've had a few new, cheapo fobs that were faulty out-of-the-box, too....As
I recall, in every case the problem ended up being inferior soldering and 
was repaired when on the work bench.

On Fri, 8 Apr 2016, AD2DX via arm-allstar wrote:

> 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
> >
> >
> >
> > This email communication and any files transmitted with it may contain confidential and or proprietary information and is provided for the use of the intended recipient only. Any review, retransmission or dissemination of this information by anyone other than the intended recipient is prohibited. If you receive this email in error, please contact the sender and delete this communication and any copies immediately. Thank you.
> > _______________________________________________
> >
> > arm-allstar mailing list
> > arm-allstar at hamvoip.org<mailto:arm-allstar at hamvoip.org>
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB and RPi2 web page - http://hamvoip.org<http://hamvoip.org/>
> _______________________________________________
> 
> arm-allstar mailing list
> arm-allstar at hamvoip.org<mailto:arm-allstar at hamvoip.org>
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> 
> Visit the BBB and RPi2 web page - http://hamvoip.org<http://hamvoip.org/>
> 
> This email communication and any files transmitted with it may contain confidential and or proprietary information and is provided for the use of the intended recipient only. Any review, retransmission or dissemination of this information by anyone other than the intended recipient is prohibited. If you receive this email in error, please contact the sender and delete this communication and any copies immediately. Thank you.
>