Thats good stuff
Mike Martin
RFI Services
240.508.3760
mike@rfiservices.com
www.rfiservices.com
On Mon, Oct 17, 2022, 8:38 PM Dave (NK7Z) <dave@nk7z.net> wrote:
> Well done!!!
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 10/17/22 16:01, Don Kirk wrote:
> > Hi Mike and Gang,
> >
> > Contrary to what I was told this morning the RFI has been eliminated and
> > the ground wire was indeed the cause of the RFI. It was arcing to
> > something up high on the pole and the supervisor that first came out this
> > morning did go up in a small bucket truck and was able to push on the
> > ground wire to stop it from arcing, and now has scheduled a lineman to
> come
> > out for a permanent fix. The noise floor at N4TZ dropped 6 S units on 10
> > meters from S6.5 as shown in the video to S0.5 when the ground wire was
> > moved to stop the arcing.
> >
> > I went back to the pole this afternoon to confirm the power pole is no
> > longer generating RFI.
> >
> > Just FYI,
> > Don wd8dsb
> >
> > On Mon, Oct 17, 2022 at 10:56 AM Don Kirk <wd8dsb@gmail.com> wrote:
> >
> >> Hi Mike,
> >>
> >> Points well taken, and thanks for your comments about the audible noise
> >> and possible root cause of it.
> >>
> >> I’ve been told the power company already responded this morning and
> >> noticed the ground wire that was moving around in the wind and they
> fixed
> >> that but that did not fix the problem. They are sending a lineman out
> this
> >> afternoon to dig into the problem.
> >>
> >> Just FYI,
> >> Don wd8dsb
> >>
> >>
> >>
> >> On Mon, Oct 17, 2022 at 10:30 AM Michael Martin <mike@rfiservices.com>
> >> wrote:
> >>
> >>> Chances are that audible noise is caused by a broken jumper when a
> >>> lightning arrestor where it attaches via a hotline clamp onto the
> line. I
> >>> think I've heard that sound about 20,000 times! Ed's point about
> standing
> >>> under the line, also known as line of fire, is always best to not be
> under
> >>> it regardless of the situation. And no one should bang on a pole or
> shake a
> >>> guy wire including employees of the utility. Doing that shares an
> extreme
> >>> lack of education or ignorance. I have often told people during my
> lectures
> >>> that knowing there's a 7000 volt arcing source over your head that you
> >>> should bang on what's doing it!
> >>>
> >>> Mike Martin
> >>> RFI Services
> >>> 240.508.3760
> >>> mike@rfiservices.com
> >>> www.rfiservices.com
> >>>
> >>> On Mon, Oct 17, 2022, 8:22 AM Hare, Ed, W1RFI <w1rfi@arrl.org> wrote:
> >>>
> >>>> If you can hear an arc or heavy spark taking place on a pole, that
> pole
> >>>> is certainly making a lot of RF noise! It really is also a
> maintenance
> >>>> issue because it is possible that the arc is eroding metal, possibly
> >>>> dropping a line to the ground.
> >>>>
> >>>> Utility people can use the "bang the pole" technique because they cone
> >>>> off the area, don't stand under the lines and wear hard hats. (Or
> they
> >>>> should!) Something is wrong on that pole and if you bang it, you may
> >>>> diagnose the problem by dropping the bad insulator through the
> windshield
> >>>> of the passing car. Leave that to the pros.
> >>>>
> >>>> Ed Hare, W1RFI
> >>>> ARRL Lab
> >>>>
> >>>> ________________________________
> >>>> From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> on behalf of
> Don
> >>>> Kirk <wd8dsb@gmail.com>
> >>>> Sent: Sunday, October 16, 2022 9:01 PM
> >>>> To: RFI <rfi@contesting.com>
> >>>> Subject: [RFI] RFI case where I could actually hear the power pole
> >>>> arcing with my naked ear.
> >>>>
> >>>> Today I tracked down RFI to a power pole that was causing problems at
> >>>> N4TZ. This was an interesting case as the pole was located in front
> of a
> >>>> house out in the country and the homeowner saw me looking at the pole
> >>>> with
> >>>> my portable RF direction finding gear and she came out to talk with me
> >>>> and
> >>>> to apologize about her barking dog. The homeowner immediately
> mentioned
> >>>> that the pole makes a lot of noise and sure enough I could hear the
> >>>> arcing
> >>>> with my naked ear (you can hear it at the 2:30 mark in my video). She
> >>>> also
> >>>> mentioned that she recently saw an employee of the cable company
> >>>> banging/hitting the pole.
> >>>>
> >>>> Here is a link to a video I just uploaded to youtube documenting this
> >>>> case
> >>>> for those interested.
> >>>> https://youtu.be/TVjKANTmVEc
> >>>>
> >>>> 73,
> >>>> Don (wd8dsb)
> >>>> _______________________________________________
> >>>> RFI mailing list
> >>>> RFI@contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/rfi
> >>>> _______________________________________________
> >>>> RFI mailing list
> >>>> RFI@contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/rfi
> >>>>
> >>>
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|