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

# Undersampling IF software

Started by ●October 2, 2006

Reply by ●October 2, 20062006-10-02

>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.