On 12/22/2022 12:05 AM, KD7JYK DM09 wrote:
Most LED lighting seems to produce noise due to the switching mode power
supply.
Yes, whether outboard, or built into the fixture or the bulb. This is
not conjecture, it is firmly established. I published a tutorial on RF
noise noting that more than ten years ago. LEDs themselves are NOT
generators of RF noise. It is always the associated electronics, usually
modulating DC with a rectangular wave, which consists of an infinite
string of harmonics, and that current is radiated by wiring that carries
it. For several reasons related to how equipment is (poorly) built, that
current (RF noise) is common mode.
73, Jim K9YC
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