[Elecraft] OT: RF interference from grow lights.

[Harry Yingst]

 It could also be Metal Halide lights over someone's Saltwater Aquarium.
I run Metal Halide lights over my aquarium and mine are quiet.But I knew a guy who did not have his grounded and shieldedand they put out so much noise they wiped out his TV reception.
I gave him a bunch of snap on chokes and as I recallhe also grounded the reflectors and it quieted it down.





    On Thursday, August 20, 2020, 09:09:03 PM EDT, ab2tc <ab2tc at arrl.net> wrote:  
 
 Hello all,

https://www.edn.com/how-cops-are-finding-grow-ops-with-am-radios/

The above is a link to an article in the EDN magazine (a technical journal
primarily aimed at EEs). The article is more than five years old, but maybe
it is only recently this type of interference has started to show up in
upstate New York. I have one of these noise sources somewhere in my
neighborhood (it’s not that easy to pinpoint due to the low frequency). I
know this is OT and maybe somewhat controversial, but this type of strong
interference is of great concern to the amateur radio community. I am not
after anybody in my neighborhood getting arrested, but I very much want to
see the interference stop. Even if the operation is legal, the emission is
definitely way outside FCC part 15 limits. Quote from the article:

“..conducted emission data clearly shows peaks as high as 100+ dBuV (50 dB
over the limit) in the range 6 to 8 MHz, with lower peaks at 14, 18, and 21
MHz.”

My interference is primarily in the 7MHz band. 14 MHz is virtually free of
it. See here for a screenshot:

http://www.ab2tc.com/growlights.png

There are three peaks, approximately 49 to 50kHz apart. The center one is
centered under the cross hair cursor. As you can see, the band is starting
to come to life at about 2:30 in the afternoon. The interference is on 24/7
as far as I can tell.

Does anybody have any experiences like this and/or any suggestions what to
do? If you want to keep this confidential, E-mail me privately. My E-mail
address is OK on qrz.com.

AB2TC – Knut

PS. I have previously reported power line noise to the electrical company
and have had positive responses (fixes) from them. I suspect that this kind
of interference is not easily detectable on their UHF based sniffers;
besides I am not sure if conducted interference from residences lies under
their jurisdiction (there are only residences here for many blocks).





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