Re: [Discuss-gnuradio] BPSK, Costas loop

[mgray]

I've built and flown a PSK-31 transmitter on board a high altitude weather 
balloon.  The HF signal is useful for over the horizon tracking.  Although 
it wasn't done using GNU radio, all the hardware and software is open 
source.  This could be adapted to work with GNU radio:

http://www.kd7lmo.net/psk31.html

Things like building the message, varicode, modulation, etc. are all 
reusable.

On Thu, 31 Mar 2005, Robert Kelley wrote:

> That's a great source of information about PSK31, thanks.
> 
> I am especially interested in using gnuradio for PSK31.
> 
> The URL is wrong, it's psk31.htm but I found it anyway.
> 
> Chuck Swiger wrote:
> 
> > At 03:09 AM 3/31/2005 -0500, you wrote:
> >
> >> Hey everyone,
> >>
> >> I think I have a semi-decent implementation of BPSK modulation and
> >> demodulation (via a Costas loop). I wrote up some details about it at
> >> http://web.mit.edu/imirkin/www/gnuradio/bpsk.html . It seems to work
> >> with the script that I was testing it with, but I haven't actually tried
> >> anything OTA or with any *real* drift and so on. This applies into the
> >> gnuradio-core tree directly.
> >
> >
> > Hey - looks good - here's a plot of  0000 0000  1010 1010  0101...
> >
> >
> > http://webpages.charter.net/cswiger/bpsk.jpg
> >
> > I would be interested in using that with this description of psk31
> >
> > http://home.teleport.com/~nb6z/psk31.html
> >
> > to create a transmitter completely within gnuradio.
> > (currently I'm looping audio from linpsk)
> >
> > Any better links to psk31 details appreciated.
> >
> > --Chuck
> >
> >
> >
> >
> >
> > _______________________________________________
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> >
> 
> 
> 
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