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Re: DSP based High Speed Data



The original article was suggesting "high-speed" packet and did some
calculations for data throughput.  The original article also assumed a 20kHz
base band bandwidth.

I doubt if the "soundcard" solution can get anywhere near the speeds
mentioned in the original article and I do not know any commercial sat-able
amateur radios that have more than 5kHz baseband signal bandwidth.

If the idea is really "high speed in DSP" I would be forgetting about sound
card and intel libraries designed to run on a PC.  I would be trying to use
something that can do some DSP on the full 20kHz baseband signal.

Such a radio was described as a kit in QST last year (Sept-Nov1999).  THis
would be my option if someone in the USA was prepared to do another kit run.
Although originally a normal FM/CW/SSB weak signal radio this radio should
be able to handle betwen 56k&115kbaud (by my estimates only) with only
writing some software and adding a serial interface.


http://www.arrl.org/tis/info/vhfproj.html
http://www.proaxis.com/~boblark/dsp10.htm
Michael


-----Original Message-----
From: Ken Tentarelli <ken@sugar-river.net>
To: Tony Langdon <tlangdon@atctraining.com.au>
Cc: 'amsat-bb@amsat.org' <amsat-bb@AMSAT.Org>
Date: Friday, 15 September 2000 10:27
Subject: Re: [amsat-bb] DSP based High Speed Data


>
>
>Tony Langdon wrote:
>
>>
>> BASIC, yes, that'd be a help, or ideally, a point and click package that
can
>> do a lot of the coding work, so it just needs a final clean up by hand.
>
>You are right.   A user interface shell in Basic would be good -  not a
Basic
>interpreter as my earlier email said.  Intel has a great library of low
level routines
>for image processing and Fourier analysis that are callable from high level
>languages  (free on their web site)  I've seen students use the libraries
under
>Visual Basic to do fairly high speed processing with little effort.    The
library
>routines manipulate arrays of data and the Visual Basic just triggers the
library
>routines.   A similar  library of functions for carrier detection,  hdlc,
etc.  could
>be useful  for  ham tinkerers.
>
>Ken  AC1H
>
>
>----
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>

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