On 2/24/2013 7:16 PM, Michael Sciascia wrote:
All of the washers that I have listened to in the store (on a portable
shortwave radio with a whip) make RFI. Many are not heard 10 or 15 feet away.
You should be aware that noise can be radiated directly by wiring
internal to the source, and it can also be conducted to external wiring
(like the power line) and radiated from that. In both cases, the trash
is picked up on our antennas just like any other RF source, and it can
also couple into our equipment when external wiring for our equipment is
not bonded to the chassis.
And for a variety of reasons, including the form of suppression that
might be provided (or not) an electronic source that is relatively quiet
in one frequency range can be noisy in another. Switching power supplies
that SteppIR sold for their motor controllers were MUCH MUCH noisier on
the higher HF bands, especially 12M. I've worked more than 175
countries on 12M since moving here six years ago, but I could not have
worked ANY of them with that power supply in service.
73, Jim K9YC
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