I have used one which the ARRL RF lab brought down here to address a very
serious problem. We were able to identify the BOLT on the insulators where
arcing was coming from, photograph it, attach both the audio file and the
spectral display unique to each offender and the power company still reneged.
Until FCC saw this and that was the end of the power company resistance.
Problem fixed. Those devices are not easy to aim however. You need a steady
hand and lots of patience.
Sent from my iPhone
On Dec 21, 2011, at 4:10 PM, "John G3PQA" <g3pqa@onetel.com> wrote:
>>>> On 12/18/2011 2:36 PM, Dave W5UN wrote:
>>>>> I'm looking for input from someone who has experienced a similar
>>>>> situation as I describe below.
>>>>>
>>>>> About 3 months ago I began experiencing severe noise on top
>>>>> band. It's a constant white noise which begins to drop off above
>>>>> 2.5 mHz,
>
>> On 12/20/2011 2:30 PM, David Raymond wrote:
>>>
>>> Jon. . .great advice, particularly about going to higher frequencies
>>> as you get closer to the noise source. We've spent considerable time
>>> chasing noise at our contest station. I addition to using RF we also
>>> use a high range audio device with a highly directional dish antenna
>>> which listens in the 20 - 40 KHz range. It is an excellent tool to
>>> have in the arsenal when you get in close (say, 100 yards or so). You
>>> can usually pinpoint the noise right down to the specific insulator,
>>> lightning arrestor, etc. In some cases it would be worth borrowing one.
>>> 73. .. Dave
>>> W0FLS
>
>> (Jon, AA1K): tnx info Dave ....where can those be had?
>
>
> For those who wish to build an ultrasonic detector (or in the absence of DX
> locate bats!) an article was published by ARRL in 2006
> http://www.arrl.org/files/file/Technology/PLN/Ultrasonic_Pinpointer.pdf
> I have built a couple of this design using the Far Circuits pcb and they
> work well, needs a small parabolic dish and piezo electric detector at its
> focal point.
> Also I should mention that Jerry K4SAV has designed some improvements in
> sensistivity and mixing if needed.
>
> re. Dave's noise problem, it sounds bad , not the usual switchmode etc. we
> suffer on 160m.. Any progress Dave?
>
> 73
> John G3PQA
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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