On 2/7/2020 10:39 AM, r55stan@gmail.com wrote:
The lesson for me on that project was RFI can get out of a piece of equipment on EVERY conductor that comes out of it.
RIGHT.
I think we tend to only focus on the power cord because for most
appliances those are the only wires connected to it. My only other
comment is a single pass through a ferrite probably won't reduce a
strong RFI source enough.
Also correct, but there is MUCH more to it. Study k9yc.com/RFI-Ham.pdf
and http://k9yc.com/KillingReceiveNoise.pdf
The culprit in these units is the variable speed motor controller, which
is a generator of rectangular waves, the pulse width and/or frequency of
which is varied to control the speed. Better mfrs of these units MAY
have optional filters/mods for RFI.
73, Jim K9YC
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