[RFI] carried powerline noise on 15m and 20m

[Charles Plunk]

Jim,

Reminds me of Gunsmoke. When tracking the bad guys, they look for clues 
to make sure its the right tracks :-).

Chuck

W4NBO

On 2/16/22 07:32, AA5CT wrote:
> I want to "second" what Charles wrote! Always make sure the
> 'rabbit' you're after with VHF/UHF is the one bothering you on HF!!
>
> I have chased down 160m and 80m noise sources that were miles
> away and, of course, there were many low-level 'sources' between
> my place and the *real* source that I did not hear on 80 or 160m
> bands at my QTH/place.
>
> de Jim AA5CT
>
> - - - - - - - - - - - - - - - - - - - - - -
>
>
> On Wednesday, February 16, 2022, 2:24:55 AM GMT-6, Charles Plunk 
> <af4o at twc.com> wrote:
>
>
> Ignacy,
>
> I sent you a more detailed message direct.
>
> Have you got a VHF yagi you could more accurately pinpoint its
> direction? If so, does the VHF noise match the HF noise? Helps a lot if
> the noise goes intermittent (has a distinctive pattern) to match. I no
> longer use 2m at all, but have left my 2m horizontal up for just this
> reason.
>
> Have you tried to see the 120hz spikes somehow?
>
> Are the private property poles drops 120/240 or higher voltages (mine
> are 7.2kv for example)?
>
> A strategy may be to try triangulating on 2m then 70cm.
>
> And most important, make sure you are triangulating the source you are
> hearing at your station. From my experience, there is lots of near field
> noise when out using a loop/2m yagi etc to easily throw you off your
> intended target. Those sources may not even be heard at your station.
> This maybe why you are getting confusing directions with the loop. I
> retransmit my noise to an ht to match the noise audibly with my tracking
> receiver. Again, helps a lot if the target source is intermittent to
> more easily match. Not easy to do, I have ran out at a moments notice
> when the target went intermittent, lol. Not any single technique has
> helped me as much as this. Ignoring all the other noise. Seems every
> pole has some noise when near it that will throw you off track.
>
> 73
>
> Chuck
> W4NBO
>
> On 2/15/22 20:43, Ignacy Misztal wrote:
> > My radio shows about S4 noise on15m when the beam is oriented 
> towards the
> > nearest power pole. There is S3 noise on 10m and almost none on 20m and
> > below. The noise is canceled completely with NB so I assume it must 
> be from
> > a single source.
> >
> > My MFJ VHF sniffer detects just a trace or nothing. A DX engineering 
> loop
> > has weak readings, similar in strength to the nearest pole and to 
> the next
> > few poles.
> >
> > The QTH is in a rural area. I walked along power lines for a mile and
> > could not find anything strong. There are some poles deep on private
> > properties.
> >
> > My first question is whether the power lines are somewhat resonant 
> on 15m
> > and carry the signal for a long distance. My second question is about a
> > strategy to find the RFI when teh culprit is far away and directions 
> from
> > loops change every 50 ft.
> >
> > Aside from the MFJ 3 el sniffer, I have their ultrasonic dish, a 
> tuned loop
> > for HF and a DX engineering directional loop. Also a Yagi for 70cm.
> >
> > Ignacy NO9E
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