If the power company has any competence whatsoever with regard to locating
noise, they will have one of the high freq audio noise locating devices. In
some cases, if you're going to chase noise on behalf of the utility (and
locate their problem), they may loan you the equipment. Incidentally, some
of the super acoustical devices do have a laser for aiming. Also, remember
when you get in close it can be helpful to pinpoint the noise during
darkness and when it is quiet (quiet as in traffic noise, not electrical
noise). You can sometimes either see the arcing or hear the noise coming
from it.
73 and Season's Greetings to all. . . Dave
W0FLS
----- Original Message -----
From: "Sam Morgan" <k5oai.sam@gmail.com>
To: <topband@contesting.com>
Sent: Wednesday, December 21, 2011 4:14 PM
Subject: Re: Topband: Noise problem question
>I haven't built or used one, yet
> but I have often thought it might be a good idea
> to put a laser on one, kinda like pointing a weapon with a laser
>
>
> GB & 73
> K5OAI
> Sam Morgan
>
> On 12/21/2011 4:04 PM, W2PM wrote:
>> 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.
>>
>
>> 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
>
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