Even with the IF shifted from 0, you should still get your 48 KHz. It's just
that the window won't be centered.
Let's take the SDR1K for example. At a 96KHz sample rate you should be able
to see 96 KHz of bandwidth (and you can, if you modify the code). But because
of the SDR1K's 11 KHz IF, what you'll actually find is that you can see about
+37 KHz to the right of the SDR1K's "centerline" (your listening frequency) and
-59 KHz to the left of the centerline, rather than 48 KHz on either side.
I'm using the Delta 44, and there is some aliasing as you approach and pass
thru nyquist. Because of that, and because of the +/-1 KHz shift of the IF for
spur reduction, I found it best to limit my display to 86 KHz full bandwidth,
rather than the theoretical 96 KHz. In other words, my SDR1K displays -54 KHz
to +32 KHz from the listening centerline.
But the point is, you can get "essentially" a full bandwidth display
irrespective of the IF frequency, as long as you don't mind that the bandwidth
isn't displayed symmetricly about your listening frequency.
- Jeff
jr_dakota <[EMAIL PROTECTED]> wrote:
I was thinking it would be nice to have both, 0 IF when you want to
see 48Khz of bandwidth but once you've 'locked in' on a signal you
want, go to a low IF to get a gain in performance by getting away from
all the trash and other problems at 0 IF ...
This would mostly be a software thing and for that I have to work with
what others have done, my experience with DSP consists of playing
around with the EMU chip in the Live! soundcards
JR
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