Title: Common-Mode Chokes by Chuck Counselman, W1HIS Post by: Steve - K4HX on October 14, 2015, 08:44:49 PM Common-Mode Chokes1 AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
by Chuck Counselman, W1HIS Excerpts: This article tells what common-mode chokes are, why and where to use them, and how to make ones that work well, at minimal cost both in time and in dollars. In the HF hamshacks that I’ve visited, the background noise level heard on most HF bands (especially the low bands) could be reduced by more than an S-unit by means of common-mode choking. In some cases (which I could name but won’t, to avoid embarrassing my friends) I was able to reduce the received noise level by four or five S-units. I reduced my own received noise level on the low bands by even more. http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf |