[amsat-bb] Linux soundmodem with AO-40

["Delbert Matlock" <Delbert@xxxxxxxxxxx>]

>From Margaret Leber:

> Jerry mentions soundcard modems...has anybody recieved RUDAK with one
> of these yet? I was about to try to get such a thing working with Tom
> Sailer's Linux soundmodem program, but Stuff Happened with my soundcard
> support; I need to sort out an apparent PCI conflict with my ethernet
> card before I can get back to my PCI sound card that uses the es1371
> driver; the via82cxxx_audio driver the native sound on the motherboard
> uses is apparently incompatible in some way with Soundmodem (and
> consequently also with Tom's excellent p3dtelem demodulator). Anybody
> out there using ALSA with the VIA Southbridge audio? Does it resolve
> the "sm[6037]: audio: Error, cannot set nonblocking mode"? I'd really
> rather use the native audio than give up a slot to the PCI card.

Are you using the soundmodem driver that is built into the Linux kernel or
Tom's new user mode soundmodem?  If you haven't tried the user mode version,
take a look at:

   http://www.baycom.org/~tom/ham/soundmodem/

I've been testing it out with regular terestrial APRS and space station
traffic parallel to the TNC built into a Kenwood TH-D7A(G).  The soundmodem
appears to pickup 90-95% of what the serial TNC decodes.  Not bad.
Unfortunately, I don't have any reliable 9600bps streams in the area to test
against.

For anyone thinking of playing with soundmodem, another nice feature is that
you can setup several virtual devices for different speeds and encoding
types.  Rather than having to unload and reload the driver every time you
wish to change encoding, you just look at a different network device.

--KG4NMC

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