On 1/30/2022 10:55 AM, Michael Tope wrote:
I am not aware of any interference from the IR LED arrays that are built
into the cameras, but just in case these illuminators are more
problematic I thought I would run this by the reflector before I press
the "add to cart" button.
Hi Mike,
Thanks for the QSO last night. Great to hear you on the air again.
99.9% of what gets plugged into the wall includes a switch-mode power
supply, 99.99% of them are noise generators, and any attached wiring
(like AC and DC cables) is an antenna that radiates the strong common
mode component of the noise. Over the years, I've collected boxes of
linear DC supplies, from which I find one to replace them. When they're
built into a product (TV, stereo gear, refrigerator, etc.) serious
common mode chokes on all attached wiring is the only solution, starting
with those cables likely to be the strongest radiators.
DC-DC converters used inside products like computer speakers that power
from USB are also noise generators. Neighbor W6GJB had so much on the
pair in his shack that he could measure the common mode current with an
MFJ device!
73, Jim K9YC
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