Was it windy? It sounds like arcing on a power line. I had something similar
here, it was loose hardware on a old power pole, it made a buzz buzz random
noise when it was windy. When I had it narrowed down to the pole all I had to
do was push on the power pole a little and the noise was there. Power co.
fixed it. I would try to get a heading on it using 10 meters and a beam if you
have one. Walking the power line with a air band receiver would get it
narrowed down. If it's real strong at your QTH on 10 meters then it might be
close.
Good luck.
Dale, k9vuj
On 01, Dec 2012, at 23:14, Gary Smith <Gary@ka1j.com> wrote:
> I'm having a horrific level of QRM which seems to bother 160M and 30M
> the most. My inclination is it's a street light that is causing the
> noise as I often notice it at gray line times. I was working the ARRL
> 160M contest and it started up around 11PM local time. It was
> sufficient to ruin any chance of QSOs during the contest so I taped
> it first with a 200Hz filter on CW and you can hear what it sounds
> like to me. no file is more than 400k in size.
>
> Its often a repetitious rhythm of buzz that happens 2-3 times per
> second with occasional dead times of several seconds and then back to
> it again. Sometimes it is persistent for several minutes and then
> back to the buzz-rhythm.
>
> Here is a view of the QTH. My house is the last one, at the end of
> the road & next to the rail line. I am sandwiched between two state
> parks. Other than Amtrak being beside the house and the people on the
> road south of me, there is no other house or signal generation within
> a mile. Mt antennae are wires in trees next to the salt marsh.
>
> http://tinyurl.com/cy7zv7h
>
> Here's #1 with the 200HZ filter during the contest at the bottom of
> the band and then tuned below the ham band for no CW in the
> background for comparison.
>
> http://doctorgary.net/1-QRM-2.8KHz-CW-filter-160M.mp3
>
> Then I recorded the same conditions on LSB with a 4K filter. I did
> the same and dialed below the contest for comparison.
>
> http://doctorgary.net/2-QRM-4KHz-LSB-160M.mp3
>
> So as often happens, it stops for no known reason. I went outside
> with the AM and got half way down the drive and it stopped. I saw no
> street light flickering. I came back and made a similar tape with
> 4KHz LSB and you can hear the difference in what I can hear. I also
> drifted below the band for comparison
>
> http://doctorgary.net/3-QRM-gone-4KHz-LSB-160M.mp3
>
> Sat at around 7 AM it started and I had to stop calling CQ and quit
> because I couldn't make out anyone who wasn't extremely loud.
>
> Any idea what this sounds like it might be so I can deal with it?
>
> & thanks!
>
> Gary
> KA1J
> _______________________________________________
> 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
|