If you receive the signal across 7 poles, you know the signal will be
stronger at the source pole. Reduce your gain to eliminate the weaker
signals. Stand at least 20 feet away from the lines at equal distances from
two poles. Pointing your yagi back and forth as you reduce your gain to
eliminate the weaker signal. Once you determine which of those two poles has
the stronger signal move in that direction and perform the same test between
the next two poles. Then repeat.
The fact that you don't receive the signal at UHF is not a good sign for
arcing. However it is a good indication of either further away or inside one
of the houses connected to one of those 7 poles. That would also explain one
of several reasons for no success using ultra sound. The first reason for a
lack of Ultra sound success is lack of sensitivity. This one is for sure.
Remember, ultra sound is your last step and it can only be as successful as
the proceeding step. Do Not use ultra sound unless you are 100% positive
about the structure containing the source. Don't put your foot before the
crutch! Also, Ultra sound on a windy day is a mess and very un reliable.
That's like using it while someone is shaking the pole. See what I mean?
Use my "how to locate the residence" instructions. It works!
(http://www.rfiservices.com/residence.htm )
Look out for the next edition of the ARRL's RFI Handbook.
Merry Christmas,
Michael C. Martin
RFI Services
6469 Old Solomons Island Rd
Tracys Landing, MD 20779
www.rfiservices.com
240-508-3760
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of N1BUG
Sent: Wednesday, December 26, 2012 5:19 PM
To: eddieedwards@tconl.com
Cc: RFI@contesting.com
Subject: Re: [RFI] Power line noise question for the experts
Ed,
It is one of the DIY "kit" units. However it is the recently released RX3,
not the older RX2 or RX1. Under controlled test conditions, this unit picks
up a spark at 100+ feet vs. 35 feet for the previous model. What that
equates to in terms of sensitivity specifications I leave to brighter minds.
(Disclaimer: while I do not profit in any way from sales of this unit, I did
play a minor role in the R&D process)
The power company has checked that pole twice with a Radar Engineers model
250 without hearing anything.
I'm now questioning whether in fact I have the right pole. It is hard to
have faith in my findings on those windy days when I could barely hold onto
the dish.
73,
Paul N1BUG
On 12/26/2012 05:01 PM, Ed K0iL wrote:
> Paul,
>
> What brand/model of ultrasonic unit are you using?
>
> If it's one of them DIY "kit" units, you might want to use a more
> sensitive unit if you want to confirm your findings. Or possible just
> have the utility confirm your findings with their equipment, assuming
> they are using better equipment.
>
> 73, de ed -K0iL
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