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Re: 38k4 radios and modems ?



Mark,
	WiSPDDE can receive DDE from SatPC32 besides WiSP, Nova and others...

	73,
Nando.

On Fri, 25 Feb 2005 10:56:14 -0500
"Mark L. Hammond" <mlhammond@charter.net> wrote:

> Hello John and Graham,
> 
> Thank you both for again confirming the abilities of the PCR-1000 for
> 38k4 packet.  I wish we had more air time to test!
> 
> CX6DD Nando's very fine program WispDDE allows serial/computer control
> of the PCR-1000, and it works quite well.  You can set the audio
> level, which mode, what filter settings, etc. and it will do the
> frequency correction just fine when running with Wisp.  I have used
> WispDDE and Wisp to grab some WXSAT images a while back, so it can be
> automated to work well.
> 
> Maybe we can coax Erich DK1TB to add the PCR-1000 to his very fine
> SatPC32/DDESat32 programs, too :)  I know I'd be happy to test it.
> 
> What I find difficult is getting it all automated to work effectively
> with an S-band downconverter; I need to get a better handle on the
> stability of the downconverter frequency, as I suspect this may be the
> culprit.
> 
> Now that I have two confirmed/working TNCs (okay, one is a DSP ;) for
> 38k4, I think I will try to get my TAPR DSP56002 EVM unit outputting
> 38k4 data (presumeable it can, by just a quick edit in the code so it
> xmits 38k4 instead of 9k6).  So, essentially EVM 38k4 OUT --> Paccomm
> 38k4 IN is the test.  If I can get that working, then I can begin an
> attempt to record (and playback) some 38k4 packet audio files for Doug
> (and others that might be interested...), as well as experiment a bit
> with the PCR-1000 in my shack.
> 
> Looks like a fun project for this weekend!!
> 
> 73,
> 
> Mark N8MH
> 
> > 
> > From: John Melton <John.Melton@Sun.COM>
> > Date: 2005/02/25 Fri AM 06:53:59 EST
> > To: Graham Shirville <g.shirville@btinternet.com>
> > CC: John.Melton@Sun.COM,  Tim Tuck <tim.tuck@penrith.net>, 
> >         Amsat-bb
> >   <amsat-bb@amsat.org>
> > Subject: Re: [amsat-bb] 38k4 radios and modems ?
> > 
> > I can also confirm that the PCR1000 works well for 38k4 data.  You
> > do need to adjust the tuning for doppler for optimal results.  The
> > PCR1000 should be configured for Narrow FM at 50 KHz and you should
> > use the standard 9600 packet socket for connection to the TNC.  The
> > Wide FM uses a different circuit in the receiver and does not have
> > any takeoff for the digital signal.
> > 
> > Although not published by Icom,  the commands to control the PCR1000
> > have been well distributed on the web.  I believe that there is some
> > code to work with WiSP available.  I wrote my own in Java as I do
> > not run any Microsoft systems!
> > 
> > Regards,
> > 
> > -- John  g0orx/n6lyt
> > 
> > On Fri, 2005-02-25 at 10:52, Graham Shirville wrote:
> > >  Hi All,
> > > 
> > > Yes I can confirm the PCR1000 with a DB6NT downconverter is
> > > working very well listening to 38k4 data coming from the S band
> > > transmitter on SSETI Express - at least across the cleanroom where
> > > testing is presently underway!!! - Watching the packets fly across
> > > the screen makes 9k6 seem as slow as 1k2 seemed when we had 9k6
> > > for the first time......
> > > 
> > > Two caveats on using the PCR1000  tho - the quoted "wideband"
> > > bandwidth is listed as 50kHz which is marginal for 38k4 data -
> > > although I dont know the actual bandpass shape and suspect the
> > > edges are very "soft" - and I am not sure how you would control
> > > the tuning for doppler but as it is a computer controlled radio I
> > > assume it should be possible.
> > > 
> > > Our "guru" Howard G6LVB is presently undertaking further research
> > > into this area so your results with AO51 will be very helpful in
> > > assisting us to make sure we have everything as right as possible
> > > for the SSETI Express groundstations - both the amateur and
> > > university ones.
> > > 
> > > By the way the SSETI Express launch date has slipped a little -
> > > now not expected until late July......
> > > 
> > > If you wish to see a photo of the dual band U/S "groundstation" as
> > > it exists at the moment click here!
> > > 
> > >  http://sseti.gte.tuwien.ac.at/WSW4/express5.php?pag=3  and then
> > >  on pic 148
> > > 
> > > 
> > > best 73
> > > 
> > > Graham G3VZV
> > > ----
> > > Sent via amsat-bb@amsat.org. Opinions expressed are those of the
> > > author. Not an AMSAT member? Join now to support the amateur
> > > satellite program! To unsubscribe, send "unsubscribe amsat-bb" to
> > > Majordomo@amsat.org
> > -- 
> > John Melton <john.melton@sun.com>
> > Sun Microsystems, IT CTO
> > ----
> > 
> 
>  
> Mark L. Hammond    [N8MH]
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the
> author. Not an AMSAT member? Join now to support the amateur satellite
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> Majordomo@amsat.org
----
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