Intro to SDR and RF Signal Analysis
If you want to dabble for _cheap_ with SDR, the RTL-SDR [1] is a < $10 USB receiver that works from 24 to 1766 MHz.<p>It allows to listen to FM radio, decode most 433MHz devices (weather stations), car keys signals, and even NOAA weather satellites [2] with a DIY antenna [3].<p>[1] <a href="https://osmocom.org/projects/sdr/wiki/rtl-sdr" rel="nofollow">https://osmocom.org/projects/sdr/wiki/rtl-sdr</a><p>[2] <a href="http://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weather-satellite-images/" rel="nofollow">http://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weath...</a><p>[3] <a href="http://tinhatranch.com/how-to-build-a-qfh-quadrifilar-helix-antenna-to-download-images-from-weather-satellites/" rel="nofollow">http://tinhatranch.com/how-to-build-a-qfh-quadrifilar-helix-...</a>