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[Discuss-gnuradio] How to simulate a Zoom in FFT display ?

From: William Pretty Security
Subject: [Discuss-gnuradio] How to simulate a Zoom in FFT display ?
Date: Sun, 12 Aug 2012 13:28:28 -0400

Hello all;


I have a 40KHz carrier that I want to be able to check for modulation.

The ‘source’ is the audio source in GnuRadio Companion.


I have tried a number of things and nothing seems to work for me.

I have the source, followed by a 40KHz Bandpass filter and a frequency translating FIR filter block.

The output of the BPF and FIR filters go to separate FFT GUI’s so that I can see what is going on.


What I am trying to implement is the equivalent of the “Span” and “Center Frequency” functions on a spectrum analyzer.

The Center Frequency is easy, using the Translating FIR block, but I can’t figure out how to do the Span/Zoom function.


I Google searched and found a couple of SDR’s with this function, but it appears to be “hard coded”.


Does anybody know how to this in GnuRadio Companion ??


Thanks …



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