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
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