[RFI] Grow Lights

[Dave Cole]

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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