Sam,
My heart goes out to you since I also had a similar problem that lasted
for about 6-months. The local power company was very cooperative and
helpful but they drew a blank. I started a log to record when and where
(frequency) I heard the noises, I have six months of data. I kept track
of all construction activity in the neighborhood. The noise both random
and sparking style left one day. It was a three day process with each
day it getting better It's now been 3 months and my average noise on
all bands is less than 1-S unit. Of course band conditions can add some
more.
I can not pin it down but I really think it was a TV cable / Internet /
Internet Phone issue about 300 ft from the QTH receiving antenna. The
day it finally disappeared I noticed a cable truck in the area, I
stopped him and inquired what was going on and he stated that they were
replacing some of new high powered inline amplifiers needed for the new
Internet telephone service. I didn't press on since I was so happy at
the moment and was waiting for the next round of bursts to occur.
Now it could have been from the workers on the poles and the movement in
the poles and thus connections, I really can't say. I do know that when
the Power Company installed new poles and lines behind our property and
also the Telephone and Cable guys installed new cables that's when my
problem started. S-9 noise on all bands 160-10M with the greatest
signal on 40 meters primarily due to the antenna efficiency S-9+.
Since then I occasionally hear the random moving noise and believe this
to be attributed to a wireless internet modem wall mount
transformer/PS. If I unplug it the noise goes away either if modem is
connected or not leading me to believe it's the PS. Curred that problem
by relocating the modem and PS.
I did have a very close match to your moving signal on 40M when I lived
in a high density neighborhood in FL. I tried and tired to find the
source, pretty sure it was coming from a home loaded with teenagers and
it always started up between 7 to 7:30 in the evening and lasted way
into the early morning hours some days, either a sound system or old TV
and or one of those lava lamps but I still couldn't find which one and I
was not getting any sympathy from the home owner. Now get this!! Turns
out that the home owner was a ham radio operator (VHF) and the noise was
no trouble for him. Anyway the only way I could reduce or eliminate the
noise was using one of the noise canceling products available from ANC
or MFJ. I did realize though that a separate antenna cut for 40M was
needed to reduce that random moving noise to a S-3 to 4 level.
Knock on wood, I do not have the problem but I am fearful that one day
it will startup all over again and I am afraid of the coming warm
weather, haven't seen 80+ yet.
The tracking device I used in all cases is a Arrow dual band hand held
and a Yaesu VX-5 set for 139Mhz while driving or walking around the
neighborhood. The noise target keep moving up and down the road and we
(Power Co) couldn't pin it down. I really think some how that the cable
system amplifiers was the problem.
My problem was very frustrating, time consuming and at times got me
really down but somehow I got through it. Recommend you kill all power
to electronics first in your home one breaker, one at a time for loss of
noise, request help from the local power company, do the walking with a
hand held rig, keep a log so as to establish patterns, and keep the
faith you will get through it.
73 de
Ron W4LDE
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> Today's Topics:
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> 1. beating a dead horse - 40m noise (Sam Morgan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Apr 2009 16:40:59 -0500
> From: Sam Morgan <ka5oai@gmail.com>
> Subject: [RFI] beating a dead horse - 40m noise
> To: "rfi@contesting.com" <rfi@contesting.com>
> Message-ID: <49EE3D6B.6010702@gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Same old story, noise is not strictly limited to 40m, it's just that is where
> I
> have been doing my sleuthing trying to figure out what it actually is.
> now for the next chapter, pics of the noise using Rocky and the panadapter on
> my
> K2 as well as mp3's of the new/old developments can be seen here:
> http://pages.suddenlink.net/ka5oai-1/40m-noise-story.html
>
> It seems it may be connected to an old arcing noise that I had been chasing
> last
> summer.
> ============
> here is what I said previously:
> > Subject: [RFI] 40m (and other) noise
> >
> > I have recently started hearing a noise 24/7 on 40m.
> > The noise is heard about every 11khz and randomly moves up or down a khz
> or so.
> > Best I can tell it covers from about 6.910mhz to 8.040mhz
> >
> > I also hear it on 1.923mhz or so but only that one frequency on the whole
> 160m band.
> >
> > I just checked the 30m band and I hear it every 40khz on it.
> >
> > Can any one identify what it's coming from?
> >
> > It may show up other places,
> > I just ran into the 40m ones the last few days
> > and then tonight found the 30m and 160m one.
> >
> > I have shut down my apartment at the breaker panel,
> > and the noise is still there. I have had new neighbors move in an adjoining
> > apartment. Above and one apartment over, right below some of my antennas
> on the
> > roof.
> ================
>
>
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