On 5/23/06, Peter Martinez <[EMAIL PROTECTED]> wrote:
> Sami: Please could you try an experiment with this crud
I have performed all kinds of tests with SDR-1000, but unfortunately
haven't really documented the results. Now, in response to your
request, I looked at my old files and quickly put up this page:
http://kotisivu.dnainternet.net/ahti/sdr-1000/spec-d44-sdr1k.html
Noise around 0 Hz is always going to be an issue with *every*
direct-conversion receiver and not just SDR-1000. With extremely
careful design of receiver circuit, grounding setup, etc. you can
probably lower the near-DC noise to a negligible level. Or
alternatively it may prove to be infinitely difficult.
So I'm wondering: why insist on zero-IF? I think Gerald's idea of
using a frequency offset in SDR-1000 software is an improvement over
the original "zero-IF idea". A simple software operation solves a
difficult hardware problem.
73, Sami
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