[OZAPRS] Most convoluted HF gateway ever?

Ray Wells vk2tv at exemail.com.au
Mon Oct 26 21:05:29 EST 2009


Steve, all,

And how much hair do you have left?

Did you consider using Jack Audio to handle the audio sharing? Its a 
zero latency, many in to many out, audio tool. The audio (DJ) program I 
use on my laptop (Kubuntu 8.10) at the radio station is OTS DJ and it 
runs under wine. I couldn't stop the audio breaking up without using Jack.

Ray vk2tv

Steve wrote:
> Hello all,
>
> As I've got a PSKMail server running on 30M (PSK125, about 700Hz below 
> APRS), I thought I'd see if I could decode some HF packets too.
> APRS packets are within the audio pass band of my setup (radio tuned for 
> 10.1475MHz) so why not use the one PC and radio to do two jobs?
>
> Anyway, I don't own any physical TNCs so I had to work out how decode 
> APRS packets using the soundcard, on Linux, and without affecting the 
> PSKMail server.
>
> This is what I ended up with :-
>
> 1) MixW, running under WINE, sharing the soundcard with FLDigi (FLDigi 
> is the PSKMail modem). This involved tweaking ALSA config a bit, as 
> FLDigi likes to take full control of /dev/dsp. I would have preferred to 
> use Linux soundmodem, but I have never seen it decode a 300bd HF packet 
> ever. I don't know of any other "native" soundcard modems that do packet 
> for Linux.
> 2) Xastir as the APRS I-Gate. I know there are other ways to do this, 
> but Xastir is cool, and I can see a map of the stations I've heard via 
> HF as a bonus.
> 3) Now for the thing that took the longest to work out. A virtual 
> "Null-Modem" cable between a Windows app (MixW), running under WINE, and 
> a native Linux app (Xastir). It took me a couple of days to work it out, 
> but in the end I must say that I love the socat command!
>
> So, it has two systems running (PSKMail and APRS/Xastir), with two 
> separate sound card "modems" (FLDigi and MixW), strung together with a 
> virtual elastic band (socat).
>
> Does this count as the ugliest HF I-Gate implementation around?
> I bet it comes close!
>
> For the record, VK4UN-4 is the first station heard via this monster ;-)
>
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>   



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