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Date: Tue, 24 Sep 2002 21:40:21 -0400
To: rsgb_lf_group@blacksheep.org
From: "Larry Kayser" <kayser@sympatico.ca>
In-reply-to: <3DBE97B2.8080008@usa.net>
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Subject: Re: LF: New audio card
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>Alberto and everyone else.....

>The era of SDR (Software Defined Radio) is approaching...

I offer that the era has already arrived.  Take a good hard look at 
LINRAD.  I drove all the way down to south eastern PA to visit Roger, W3SZ 
a few weeks ago.  He has a highly optimized LINRAD system that does EME on 
144 effortlessly with a simple receiver and seeing Roger tweaking the 
performance was a true experience for me.

LINRAD of course does not do anything for the propagation workers curse of 
figuring out efficiently and quickly how to discard 98% to 99% of the data 
collected in an experiment.

LINRAD does go a very long way towards being a critical part of the 
analysis tool box for examining data by ruthlessly tweaking for 
performance.  LINRAD does require a heavy investment in learning how to 
tweak the system for high performance - I offer that anyone starting now 
MIGHT be ready by the time it is possible to use PC level products to do a 
direct receiver for 136 KHz, as you suggest this will come in the next year 
or so.

I am sending this to rhe reflector in the hope that some discussion might 
follow on what the next generation of DSP software might look like.  My 
needs continue to be to find a DSP engine that I can write application and 
human interface layers for in MS VB6 - these tools will be essential to 
make major steps forward in the world of recognizing and exploiting 
propagation events that occur infrequently to very rare occurrences.

Larry
VA3LK