Yeah, I am probably overdue to put my HF rig on a car battery and kill
the AC mains to see what I am inflicting on myself. The wall warts in
my shack seem to be multiplying like rabbits.
Likewise, good to work you over the weekend.
73, Mike W4EF.......................
On 1/30/2022 11:42 AM, Jim Brown wrote:
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
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|