[App_rpt-users] USB Soundcard Fob - no audio

Jim Whiteside jaydublu2002 at gmail.com
Fri Jan 6 09:29:29 EST 2012


Thanks for the reply.

txmixa was set to 'composite', txmixb to '0' - changing this also to
composite didn't make a difference. Do you know what

asterisk*CLI> radio tune txvoice
Current txvoice setting on Channel A is 500
Tone output starting on channel usb28233...
Tone output ending on channel usb28233...
asterisk*CLI> radio tune txtone
Current Tx CTCSS modulation setting = 200

Neither of the above did anything.

If I copnnect to the node using IaxRpt, *80 ID's fine from that
application, but not from the fob. Also I can connect to another node
and have a QSO using IaxRpt, but again nothing from the fob.

I'm plugging stereo headphones into the fob headphone jack.

Interesting advice about using LPT for the GPIO - I might pick your
brains about that if I can get the audio working - I'd rather avoid
the expense of buying in URI - the shipping is almost as much as the
device to the UK, and I'd like the challenge of working it out.


Jim M0HPJ.

On 6 January 2012 13:51, George Csahanin <george at dyb.com> wrote:
> The flashing green light is a good sign.
> That's reporting in as a CM108 for sure.
> From the source code:
> #define C108_VENDOR_ID 0x0d8c
> #define C108_PRODUCT_ID 0x000c
> In usbradio.conf make sure that txmixa= and txmixb= something other than no
> Example from one of my nodes:
> txmixa=composite        ;no,voice,tone,composite,auxvoice
> txmixb=composite
> also try (from asterisk command line) "radio tune"
> From my 2360 node:
> ...
> Tx Voice Level currently set to 350
> Tx Tone Level currently set to 160...
> If those are too low you might not get anything out.
> ALSO...to transmit tone "radio tune txvoice" should put out a tone.
> *80 (default setup) makes the thing ID, and if that isn't setup correctly
> might give you no audio.
> Another point is that I no longer modify USB Fobs. The ones I use are
> identical to the ones in that pdf. But I use the PC's parallel port lines
> for COS in and PTT out, much neater.
> I also do DC blocking (the caps) in the radio.
> ----- Original Message ----- From: "Jim Whiteside" <jaydublu2002 at gmail.com>
> To: <app_rpt-users at ohnosec.org>
> Sent: Friday, January 06, 2012 5:34 AM
> Subject: [App_rpt-users] USB Soundcard Fob - no audio
>> I'm working hard to get a basic AllStar system running, and struggling
>> to find a suitable USB Fob to modify (trying to do it on a budget)
>> I've been unable to get hold of the exact model shown in
>> www.qsl.net/kb9mwr/projects/voip/usbfob-119.pdf, but now have several
>> of a very similar one with the printed description 'Virtual 7.1Ch
>> Sound' and a slightly translucent case.
>> lsusb reports the device as 'ID 0d8c:000c C-Media Electronics, Inc.
>> Audio Adapter.' which I think might be CM119 or similar.
>> When plugged in the green led starts to flash, but I've not yet been
>> able to get any audio out of it - even when running 'rpt fun <node>
>> *80' from the Asterisk CLI
>> I wanted to confirm this was a suitable fob before going to the grief
>> of modifying - it's much more SMT than in the above PDF, and you can't
>> actually access the pins on the chip itself as it's under a 'bubble'
>> of a ceramic compound.
>> Any advice would be gratefully received.
>> --
>> Jim M0HPJ.

Jim Whiteside.

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