[Milsurplus] Noise question, not too far off topic.

[Peter Gottlieb]

Just one thing, if it's not completely obvious:  under no circumstances go 
probing or poking at power line equipment, even grounding wires.  In one 
installation my company was involved in a series of broken ground lines had them 
and a tower at 13,800 volts.  Leave it all to the utility personnel.

Also, no DF or other antennas or pointy objects near high voltage transmission 
wires or equipment!!

Peter


On 11/16/2010 10:52 PM, gl4d21a at juno.com wrote:
> Jack:
>
> If indeed, the noise is a single spike, then it is a single source.  You need to identify the specific structure it is on, then apply heavy pressure to the power company.  Since deregulation, many power companies are bottom line oriented, and do not respond very well to noise complaints.  That is where the FCC comes in.  Thay can, given the right impetus, make life very miserable for the power company.  Take a look at:<www.nps.edu/research/publications/07techrpt.html>, paper NPS-EC-07-002 for some guidance.
>
> BTW, a properly designed and applied noise blanker should eliminate that spike and not make an audible "hole" as you describe.  Something wrong there.
>
> Secondly, lightning arresters produce a multiple spike noise, and cracked insulators, in spite of what the misguided believe, are rarely noisy.  you are probably hearing a loose piece of hardware, a lag bolt not tight, loose staple on a ground wire, etc.  See the reference for a list.
>
> 73,
> George
> W5VPQ
>
> ---------- Original Message ----------
> From: Jack Antonio<scr287 at att.net>
> To: Milsurplus at mailman.qth.net
> Subject: [Milsurplus] Noise question, not too far off topic.
> Date: Tue, 16 Nov 2010 11:31:55 -0500
>
>
>
> I've been dealing with line noise here at my new QTH, which
> has been keeping me off AM.  Since a  lot of my receivers do
> not have a noise limiter, it is really a bother. Noise limiters do
> make the noise slightly less annoying, and a blanker punches a
> hole in the carrier, which is just as annoying as the noise itself.
>
> I DF'ed the area it is coming from, reported it, and the power company
> said they found bad lightning arresters and cracked insulators.  They
> will repair it (hopefully pretty soon), but told me it is an ongoing problem
> in this area.
>
> So, the question is...
>
> Does anyone have any experience with something like an MFJ DSP
> unit as an outboard unit following a BC-348 or similar receiver, in cleaning
> up line noise.  The noise waveform itself  is a sharp spike.
>
>
> Thanks
>
> Jack Antonio WA7DIA/4
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ____________________________________________________________
> Globe Life Insurance
> $1* Buys $50,000 Life Insurance. Adults or Children. No Medical Exam.
> http://thirdpartyoffers.juno.com/TGL3131/4ce351963ac5d25371bst05duc
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1153 / Virus Database: 424/3261 - Release Date: 11/16/10
>
>