Skip to main content


Showing posts with the label Why and How to make an easy RF choke

Why and How to make an easy RF choke

If you can't see the video, please insert this title URL into your browser search box: . This is post 2227 in a continuing series of simple ham radio antennas. Here's a handy and often necessary device to help you control common mode currents and other interference coming from a coaxial feed line. In this video, the "Radio Prepper" takes us step-by-step through the design, building, and testing phases of a simple RF choke.  Here are some of his observations: "For just a few Dollars to boot... An RF choke can save the day for field radio operations where you do not necessarily control all aspects of your antenna system and common-mode currents can wreck havoc on electronics, and even your fingers! Use an FT-114-31 with six turns of RG-174 or RG-316. You can also use eight turns with an FT-140-43. For more power handling you can use an FT-240-31 or FT-240-43 but I do not know the number of turns (RG-402). Do not