Thanks,,, very fun following the list. I'm not likely to get involved with this type project at the hardware level, my current interests are mostly tube gear, but current interests do change over time ;-)
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At 09:26 AM 9/29/2005, you wrote:
--- In softrock40@..., w keith griffith <kgriffit@w...>
wrote:
I have,,, 'SomeWhere' a really good description of the Weaver ssb
method.
There's a decent description of the Weaver method in the DSP section
of all the recent ARRL Handbooks.
How, if at all, does that method compare with the
softrock?
The SoftRock itself does no demodulation. All it does is sample the
incoming signal in such a way as to mix down to 11250Hz. The
downconverted signal is then dumped to the computer's soundcard.
In the subsequent software DSP on the digitized signal, the SSB
"demodulation" consists entirely of a bandpass filtering stage and
another mixing stage to spin the signal centered at 11025Hz down to
0Hz.
CW is the same, except the mixing stage spins the signal down to the
CW offset frequency (700Hz or whatever) rather than 0Hz.
73
Frank
AB2KT
