'normally' grow lights are on and off on a 12 hour cycle. I thought I had a
24/7 problem here that turned out to be grow lights on a 12 hour cycle
because of their timing and when I was checking. If you can get an sdr and
check the spectrum you may get more info. You could also record the noise
for 24 hours and see if it is really on all the time or goes away at some
point. There is always the possibility someone is running 2 lamps on
alternating 12 hour schedules, or is just running one full time because they
don't know how to do it right.
You can see my measurements at:
http://wiki.k1ttt.net/2012%20Maintenance%20and%20Upgrade%20Blog.ashx#160mrfi
(keep scrolling, there is lots of stuff in there)
And of course w0qe's excellent article at:
http://www.w0qe.com/RF_Interference/grow_light_electronic_ballasts.html
I cut down the letter I used to get the attention of the neighbor here to
remove most of the specifics from my measurements, you can get this version
at: http://www.k1ttt.net/160m_rfi/cutdownletter.docx or
http://www.k1ttt.net/160m_rfi/cutdownletter.pdf note that the specifics of
how I found it have been cut out as well as other observations of the noise,
you should fill in your own tracking info in place of that... and also the
parts highlighted in yellow would only apply if your case has the
characteristics of a grow lamp. I think some of the rest would be good to
help incentivize someone who doesn't understand the problem.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: ukbrown@aol.com [mailto:ukbrown@aol.com]
Sent: Friday, January 18, 2013 14:00
To: rfi@contesting.com
Subject: Re: [RFI] RFI on 1.8 mhz
?Good morning to all. I? have a problem that centers on about 1.8 mhz and a
bit at 3.5mhz. We have tracked it down to one neighbor house. The engergy
company Xcel Energy here in Colorado cut the power to the house and it went
away. It seems to migrate but along the power lines that are underground.
But it totally make 1.8 usless. The noise sounds like a something running
and its 24/7.
?Does anyone have any idea what it might be. There have been suggestions of
grow lights but I thought that usually they get turned off at some point.
?I hope to get a recording that I can put on this reflector to see if anyone
has run into this.
?Lastly the neighbor is totally uncooperative. Will be going to FCC on this
isse.\ ?Has anyone had experience with this. thanks PTL bill K0UK
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