I didn't... and then I did... all in the course of a few minutes ;-) It
pays to put all your reasoning in your posts, so that you can convince
yourself all over again that what you're saying makes sense. I forgot
that and paid the price. Please refer to my original post and ignore the
revision.
Bottom line is that if you don't mind being tied to a PC, and being
limited to BW in the 80-90 kHz range (or 160-180 kHz range, depending on
the sampling and filtering quality in the sound card), then a softrock
approach can be a reasonable alternative... although far from cheap if
you want top performance.
One advantage is that for casual listening, you have a second (or third)
receiver.
Larry N8LP
Jack Smith wrote:
Yes, of course. I had forgotten it was an I/Q demodulator.
Jack K8ZOA
[EMAIL PROTECTED] wrote:
A 192 kb/s sample rate gives you a usable bandwidth (Nyquist =
sample rate/2) of 96 KHz, assuming a brick-wall anti-alias filter.
More likely, the usable bandwidth will be about 80 KHz with a
practical anti-alias filter.
Make that 80 or so kHz lower side band and 80 or so kHz upper side
band, and then you have 160 or so kHz total, without breaking
Nyquist. This assumes that you have I & Q signals.
This is what Flex-Radio does.
See:
http://www.flex-radio.com/Data/Doc/qex1.pdf
http://www.flex-radio.com/Data/Doc/qex2.pdf
http://www.flex-radio.com/Data/Doc/qex3.pdf
http://www.flex-radio.com/Data/Doc/qex4.pdf
vy 73 de toby
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