[RFI] RFI with Dish Network

[Jim Brown]

On Sun, 22 May 2005 14:43:41 -0400, Bill Axelrod wrote:

>Any other hints?

It is most likely common mode on the coax, in which case the RIGHT 
ferrite choke will work. Single ordinary snap-ons won't make a dent 
in it. They are designed for VHF, but you can turn them into HF 
chokes by winding turns around them.  

Study the applications note on my website on ferrites. What you need 
is one of the multi-turn chokes using #31 (best, but hard to find) 
or #43 (easy to find) on the 2.4" o.d. core. Figure the number of 
turns based on the data and the bands where you have the problem(s). 

http://audiosystemsgroup.com/SAC0305Ferrites.pdf

This paper is written for audio guys, but the concepts apply to your 
problem. 

Jim Brown  K9YC