[Elecraft] OT: LED Light Bulbs

[Kevin Cozens]

On 2017-10-21 10:48 AM, w4sc wrote:
> LED bulbs are required to meet FCC Part 15 FCC, Class B regulations.

I found out first hand a number of years ago that a device that has type 
approval in the US can still spew a lot of unwanted RF. Better to have some 
approval process but it would be better if the specs were much more strict.

I worked for a company that had a pair of transceiver devices used in 
real-time data collection. The devices had FCC type approval but failed to 
pass the UK type approval process. I couldn't believe what I saw when I put 
the devices on a spectrum analyzer. The main oscillators operating in the 
27MHz and 49MHz ranges had harmonics galore up in to the gigahertz range. It 
made me wonder if the original designer ever checked the devices with an SA. 
I was able to fix the problem for both devices with trivial changes and the 
devices then passed the UK approval process.

The FCC (or was it ARRL) is doing a study/survey about the increasing noise 
floor in the RF spectrum. It no longer surprises me that the floor is rising 
when the US approval process is so lax.

-- 
Cheers!

Kevin.

http://www.ve3syb.ca/           |"Nerds make the shiny things that distract
Owner of Elecraft K2 #2172      | the mouth-breathers, and that's why we're
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