[SCCC] Powerline Noise?

[Tom Sneden]

Hi Ryan, I've got DF equipment on 2M if you would like some help.

Tom, K6VCR

On Fri, Jun 11, 2021 at 9:59 PM Dave Hachadorian <k6ll.dave at gmail.com>
wrote:

> It's very difficult to track down impulse noise by listening on HF.  If it
> is an arc in the power distribution system, a much better way is to search
> at VHF with a directional antenna.  If you can find a small 2M yagi, and
> find a 2M rig that receives on AM mode, that's the way to go.  I use my
> old
> TM-261A mobile rig, and the rear 4 elements of an old 11 el 2M beam.  You
> mentioned peaks being evenly spaced at 25 KHz. That is not really typical
> of
> powerline interference.  Usually it is pretty flat across a wide bandwidth.
>
> Here's a pretty good tutorial:
>
> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj8lauap5HxAhWR4J4KHVapDIIQFjAAegQIBRAD&url=http%3A%2F%2Faudiosystemsgroup.com%2FKillingReceiveNoise.pdf&usg=AOvVaw3kfp_-G1DZ3v7HdawT4zyj
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
> -----Original Message-----
> From: R. Salazar
> Sent: Friday, June 11, 2021 7:55 PM
> To: sccc at contesting.com
> Subject: Re: [SCCC] Powerline Noise?
>
> I walked the neighborhood last night with my portable SW radio and found
> what I think is the offending pole. I collapsed the antenna on the radio
> and it was still full scale noise. I think now I need something very
> directional to confirm it's the pole because it is located on someone's
> property behind a gate (and I can't smack it with a 10 lb. sledgehammer).
> The noise is 24/7 and very stable.
>
> Ryan W6ZAR
>
> On Fri, Jun 11, 2021 at 7:19 PM Dennis Younker NE6I <NE6I at cox.net> wrote:
>
> > I'm no expert in this area as I have not had to track down SDGE noise
> > since
> > moving to San Diego and SCE noise since the mid-1980s but have you been
> > able
> > to track the noise to the suspected pole? If you turn on a portable AM
> > radio
> > (or better yet, one with shortwave capabilities), are you able to
> pinpoint
> > the source? If you don't have a portable radio, perhaps using your car
> > radio
> > will help, assuming the noise is also in the AM broadcast band.
> >
> > Back in the 1980s, SCE had an excellent technician that I worked with
> many
> > times in coordination with the company I was with at the time in LA
> County
> > to track down utility related noise (and sometimes from electric fences
> > and
> > whatnot). He was great. However, from what I have read in recent years,
> > those types of guys don't exist at utilities anymore due to cost
> cutting.
> > I
> > can't speculate on that or speak with authority...that's just what I have
> > read and heard.
> >
> > I think we have one or more noise experts here on the reflector that
> > hopefully can chime in. ARRL also has an excellent noise/interference
> > expert
> > that may be of help from what I have read.
> >
> > I will say this from past experience. It's better to tread lightly with
> > the
> > utility company and offer to help/coordinate rather than call and be a
> > yelling fool. The former will get one a lot more cooperation. And the
> more
> > real data you can provide, the better.
> >
> > --Dennis NE6I
> >
> > -----Original Message-----
> > From: SCCC <sccc-bounces at contesting.com> On Behalf Of R. Salazar
> > Sent: Friday, June 11, 2021 6:13 PM
> > To: sccc at contesting.com
> > Subject: [SCCC] Powerline Noise?
> >
> > Hello all,
> >
> > For the last month or so I have been experiencing very broad banded noise
> > on
> > HF. It is strongest on 10, 11 and 12 meters but appears randomly
> > throughout
> > the HF spectrum. The peaks are evenly spaced about 24 or 25 khz.
> > Fortunately, it avoids most of the ham bands but it seems to have raised
> > the
> > noise floor throughout. I believe it is powerline noise coming from a
> pole
> > a
> > few hundred yards behind my house. I have attached a sound file which I
> > hope
> > will make it to the reflector. Just need an opinion before I call SDG&E.
> >
> > Thanks,
> >
> > Ryan W6ZAR
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