Another WiFi program: wsrtool.py This Python program allows you to process wsr files (capture files of the ISM spectrum, created by Chanalyzer with a Wi-Spy adapter).
The tool filters out selected frequencies or amplitudes (band-pass and band-stop filter).
You need to install the Python module Construct.
Here’s an unfiltered capture:
And here I used a band-pass filter with cutoff frequencies 2420 MHz and 2445 MHz:
Didier Stevens 
Well done Didier!
Comment by Donald — Friday 1 August 2008 @ 11:13
Great job!! If you adjust the starting_frequency and readings_per_sweep based on the lower and upper values, Chanalyzer will scale the view to ONLY show the frequencies of the cropped section.
Ryan Woodings
Chief Geek
MetaGeek, LLC
Comment by Ryan Woodings — Friday 1 August 2008 @ 17:28
That’s a clever idea, I’ll add it to the next version.
Comment by Didier Stevens — Friday 1 August 2008 @ 18:47
Site really resource
Comment by awainevinny — Saturday 20 December 2008 @ 1:53