[RFI] IR Illuminator for Security Cameras

[Michael Tope]

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