[RFI] Hyperikon LED Tube Info

Jim Brown jim at audiosystemsgroup.com
Tue Nov 10 15:07:23 EST 2020

On 11/10/2020 11:32 AM, Jeff (W4DD) wrote:
> This does bring up an interesting question.  How is the LED string really
> powered.

No question that it's an SMPS. Yes, products are harmonics of the 
switching frequency, but many factors affect how their their strength 
varies from one part of the radio spectrum to another. By far, the best 
way to evaluate their noise is to first identify their signal in a ham 
RX, preferably one having with a waterfall display, then poke around the 
unit and its wiring with a battery-operated RX tuned to those frequencies.

Unless you're listening to traffic on the aircraft band or trying to 
work small signal DX on 2M, listening on those bands is a poor way to 
approach any ELECTRONIC noise, just as it's a great way to chase the 
IMPULSE noise generated by arcing from neon signs and defective parts on 
power lines.

73, Jim K9YC

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