An introduction to ferrite and chokes, and how to use them to stop RFI (radio frequency interference).
Buy ferrite on my website: http://www.kf7p.com/KF7P/Ferrite_chokes.html
More how-to and tech resources on my tech page: http://www.kf7p.com/KF7P/Tech_Resources.html
ARRL RFI book: https://www.kf7p.com/KF7P/Publications.html
More info from the ARRL: http://www.arrl.org/radio-frequency-interference-rfi
W1HIS Choke info: http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
K9YC RFI ham: http://audiosystemsgroup.com/RFI-Ham.pdf