Envelope-to: dave@picks.force9.co.uk
Delivery-date: Wed, 15 Feb 2006 18:11:26 +0000
From: Warren K2ORS/WD2XGJ <k2ors@comcast.net>
To: rsgb_lf_group@blacksheep.org,  rsgb_lf_group@blacksheep.org
Cc: Alberto di Bene <dibene@usa.net>, LWCA LF Reflector <lowfer@lwca.org>
Date: Wed, 15 Feb 2006 18:10:15 +0000
Message-Id: <021520061810.26767.43F36E8700094EBD0000688F22092246270B97010D0A020E06979D0E03@comcast.net>
Subject: Re: LF: Re: DSP Question I/Q inputs?
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Alberto,


  Thanks for the reply. Do you think that having I/Q channels available would have any advantage for QRSS or other LF modes? 
--
73 Warren K2ORS/WD2XGJ
FN42hi
http://www.w4dex.com/wd2xgj.htm

 -------------- Original message ----------------------
From: Alberto di Bene <dibene@usa.net>
> Warren K2ORS/WD2XGJ wrote:
> > Hello the list,
> > 
> >        A friend of mine is building a hardware converter for his Racal 6830 
> that will mix the 455kHz i.f. down to 8.44 kHz and provide I/Q outputs. This is 
> so he can pipe the output into Alberto's SDRADIO program and demodulate the 
> wideband modes (AM/FM/SSB) in DSP. 
> >       
> >       A question arises would there be any applications at LF? I'm thinking it 
> might be useful for PSK type signals but not sure on this one.
> > 
> >    Alberto, Wolf, any thoughts on this one?
> > 
> > 
> > --
> > 73 Warren K2ORS/WD2XGJ
> 
> Warren,
> 
>    you can certainly recover the PSK modulated signal using the USB or the LSB 
> mode of SDRadio.
> But then you need a PSK decoder. One possible solution would be to use VAC 
> (Virtual Audio Cable).
> VAC implements virtual sound cards, so, e.g. you can tell SDRadio that the 
> output sound card
> is Virtual Cable Out 1, then you tell to the PSK program of your choice to 
> accept input from the
> Virtual Cable In 1. Using this technique you can reroute the output of a sound 
> card program to
> the input of another sound card program without the need of having two separate 
> sound cards
> in your PC. I have used it and it works. The URL where you can find it is:
> http://software.muzychenko.net/eng/vac.html
> 
> It is not free though...a single copy will cost you 30 USD. There is also a demo 
> version, but its
> purpose is just to evaluate if VAC would work on your setup before shelling the 
> money, as after
> just a couple of minutes of working, it adds artificial noise to the rerouted 
> audio...clever guy!
> 
> 73  Alberto  I2PHD
> 
> 
>