VCF 8.0 Pictures

[Gooijen, Henk]

  Allison wrote:

> RT-11 is an ideal OS for this.

Just what I thought! :-)

> >> I'd like to see PSK31 software for the -11.
> >
> >I have not looked into the details of all new digital transmission 
> >modes that HAMs use (for example with MixW), but without any 
> >knowledge, I wonder if a PDP-11 would be fast enough ...
> >any idea about that, Allison ?
> 
> 
> this is off topic and maybe outof band for this forum:
> The real problem is doing the base band audio processing 
> currently it's done with PCs and sound cards.  The modulation 
> is narrow (200hz or less) band QPSK at around 31 baud or so. 
> The usual reciever is SSB so the challenge is that the audio 
> stream is 500-2500hz bandwidth and multiple converstaions can 
> take place so digital filtering is done to seperate and 
> detect the signals.  Seems to require a P200 or faster. But I 
> haven't dug deep enough.  I have asked one question around 
> but no one has answered and that is what if the reciever 
> (radio) was narrow selectivity (say 300hz) so that only one 
> data stream could be heard, would that simplify the 
> filter/detect/decode process enough for a much slower processor?
>
> Allison

Yes, indeed going off topic, but it was sort-of relevant as it
dealt with the possibility in combination with a PDP-11 ... but
thanks Allison. Your last question calls for some investigation.
I hope nobody jumps on this bandwagon, but I guess one brief
reply will not hurt the list. Anyway, it is more on topic
than some recent threads I've seen here ... [pse no flames].
"Close all hailing frequencies, Uhura".

- Henk, PA8PDP.

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