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Re: [RFI] Grow Lights

To: rfi@contesting.com
Subject: Re: [RFI] Grow Lights
From: Dave Cole <dave@nk7z.net>
Date: Tue, 7 Jan 2020 12:54:33 -0800
List-post: <mailto:rfi@contesting.com>
Hi Karin,

Move up in frequency until you are seeing something like S-4, or S-5, then try your DFing again... Don't expect an exact match on the spectrum. Rather, look for patterns in on'/off times... See:

https://www.nk7z.net/rfi-now/

look at the section on "S-Meter lite"... If you are seeing the RFI come on at the exact same time, and go off at the same time each day, good chance it is a grow op. After some weeks the pattern will change, then start repeating again with new times. S-Meter lite lets you save the data and graph it. Always good in the event you need to involve the ARRL/FCC. Start a log today of all activities you are taking, and everyone you talk to regarding the mitigation of the RFI.


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 1/7/20 10:25 AM, Karin Johnson wrote:
Hello Group:
I would be interested in emailing/speaking with anyone on the this list
directly, who has had some personal experience with Grow Light RFI.
Rather than take up bandwidth on this list.  I have a specific Spectrum
and signal grouping that could be grow lights but am unable to positively
nail it down to a specific home.  Rather there appears conflicting direction
finding bearings when I get close to the source.  I am using NationalRF
loops For 3 to 8 MHz. Besides that I am reluctant to go knocking on peoples
doors right now.  From what I have seen on the NK7Z screen shots they
don't exactly correlate to grow lights.  I can supply audio and spectral
plots to enable a discussion.  Just to close this missive, the time
for ON/OFF seems to correspond to a high powered grow light.

Regards,
Karin Anne Johnson  K3UU
Palm Harbor, FL

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