[RFI] Possible Satellite Internet Interference

[Jim Brown]

On 5/11/2011 6:47 AM, David Robbins wrote:
> keep us informed... i have had a noise like that for years

Bear in mind that most RF trash from various equipment is radiated by 
common mode current that is coupled to interconnect cables, including 
power and coax. Multi-turn ferrite chokes can be quite effective in 
reducing the current and the radiated signal. If you can get at the 
equipment in question, winding 14 turns of each power cable and coax 
through a #31 toroid (or fewer turns through a #31 big 1-in i.d. 
clamp-on) is an entirely non-invasive solution that is effective from 
about 1 MHz up to at least 10 MHz.  Use one ferrite for each cable. For 
the higher HF bands, use about 8 turns on the toroid, fewer on the 
clamp-on.

73, Jim Brown K9YC