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

[gl4d21a at juno.com]

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
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