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 