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Undersampling IF software

Started by October 2, 2006
Hi,

I'm looking for a software to compute the frequency sampling for
undersampling an IF radio spectrum.

For example, if I have a IF of 455 kHz with 80 kHz bandwith, I can
sample at 200 kHz and the second IF would be 55 kHz.

I have try to compute with software designed for RF mixer but it
doesn't work because, in my example, the second IF is : ABS (
2=2Efreq_sampling - freq_IF ) and without the absolute op=E9rator, the
second frequency is negative and so the software for mixer doesn't
compute this frequency.

Thanks

>Hi, > >I'm looking for a software to compute the frequency sampling for >undersampling an IF radio spectrum. > >For example, if I have a IF of 455 kHz with 80 kHz bandwith, I can >sample at 200 kHz and the second IF would be 55 kHz. > >I have try to compute with software designed for RF mixer but it >doesn't work because, in my example, the second IF is : ABS ( >2=2Efreq_sampling - freq_IF ) and without the absolute op=E9rator, the >second frequency is negative and so the software for mixer doesn't >compute this frequency. > >Thanks > >
Is there some reason that a sketch of the spectrum won�t work? Go out to at least the 3rd harmonic of the sample clk. It�ll become obvious real quick if you�re going to have filtering problems. Just remember any folding eats into your Dyn Range.