[RFI] FW: ARLB022 FCC's OET Clarifies Emissions Compliance Testing for RF LED Lighting Devices

[Roger (K8RI)]

Kurt, your mention " If something was to change, what about the millions 
of RFI generating devices that already exist and are causing the current 
problems?"  reminds me of the lousy signal (IM products) put out by most 
SS finals (RFI) and the drive for cleaner signals.  Were ALL 
manufacturers forced to use dynamic predistortion in rigs and amps, it 
most likely would be decades before we'd see any noticeable difference 
in the bands.  With switch mode wall warts, it most likely would be many 
times that as those are thing that "get thrown in a drawer" and will 
show up from time to time until they fail.

I believe, most people connect the new wall wart to the new device and 
though the old device may be thrown in the trash, the SMPS gets thrown 
in drawer.  I have "boxes of the things". Many were power for I know not 
what.

Every time a new one shows up, I have to test it.  Fortunately for us 
and unfortunately for many users, they often use them if the connector 
fits whether the voltage and current are proper or not. The ones I have 
vary from 5VDC to 19 or 20VDC. Many are AC over a similar range. Current 
capacity varies from a few hundred MA to over 10A.  Unfortunately those 
for external drives vary more with the connectors than voltage or current.

"SOMETHING" has shown up in the neighborhood that totally wipes out 160 
and 75.  40 is useful in spots.  Two or three weeks ago, the band was 
quiet. It's audible above 40, but near the noise floor with a noise that 
sounds like arcing. On the higher bands it can be heard across the 
bands, but it's every 60 to 70 KHz on 40 and peaks at 10 over  On 75/80 
it's more it's twenty over close to every 388 KHz.  On 160 it peaks at 
ten over on  1.862, 1.925, & 1.987, or about every 62-3 KHz

It has a pause every 30 to 60 seconds that has a Berriee sound, followed 
immediately buy the buzzing sound (a series of pulses close enough together
  to sound like a buzz. .

73

Roger (K8RI)



On 6/30/2016 Thursday 6:07 PM, KD7JYK DM09 wrote:
> : I'd guess it's a start, at least!
>
> I predict no change other than a run on Part 15 labels which the products
> have always had.  Adding an "a" or a "b" to the report before manufacturing
> is unlikely to mean anything except the maufacturer for a moment, long
> enough to push the same junk through.
>
> "[W]e have found that emissions from RF LED lighting devices are
> non-periodic, broadband in nature, and are produced as a byproduct
> of the internal driver circuitry within the RF LED lighting device,"
>
> What is a "RF LED lighting device" and since LEDs run on DC, why does such a
> potentially troubling circuit exist beyond a battery and rheostat?
>
> the OET "knowledge database" paper said. "These types of emissions
> have adequate energy and potential to generate radiated emissions
> well above 30 MHz."
>
> Yes, I hear them well into the 300 MHz range when I'm out and about.
>
> "was pleased to see the FCC's OET clarify the test measurement requirements.
> He said ARRL is generally hearing more RFI complaints stemming from RF LED
> bulbs."
>
> Can someone clarify an RF LED bulb?
>
> "the Lab has seen LED lighting devices causing problems in the 2 meter band.
> "Since conducted emissions limits do not apply above 30 MHz, radiated
> emissions limits can be the first line of defense against RFI at these
> higher frequencies."
>
> That would be nice.  I've been working with aircraft communications since
> mid-last year and noise is a big problem at ground level, often rendering a
> receiver useless.
>
> If something was to change, what about the millions of RFI generating
> devices that already exist and are causing the current problems?
>
> Kurt
>
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