[Lowfer] power line interference

[Laurence KL7UK]

Bob is the sound musical starting from a lower note rising and at the end dropping - visually signal appears to start at one freq and then spreads out in harmonics, like a spider,  only to recombine together before going off?
 
Laurence
 
> To: lowfer at mailman.qth.net
> Date: Mon, 20 Dec 2010 22:02:59 -0500
> From: riese-k3djc at juno.com
> Subject: Re: [Lowfer] power line interference
> 
> OK
> 
> I live next to a hospital and for several years have nasty interference
> which spreads out over 4 Mhz
> and looks like spiders on the pan adaptors
> so how do I confront this. I am sure they have no idea where this comes
> from and would say it
> could be from the neighborhood H A !
> the racket in intermittent and hard to pinpoint so contacting the
> ARRL/FCC wouldnt work unless i can
> pinpoint the problem ???????
> stupid hospital
> 
> Bob K3DJC
> 
> 
> On Mon, 20 Dec 2010 15:07:32 -0700 "Chris Trask"
> <christrask at earthlink.net> writes:
> > >
> > > I built an ultrasonic receiver with a small hand held parabolic 
> > dish and
> > > once you are in the area they are absolutely amazing at getting 
> > problems
> > > pinpointed exactly .
> > >
> > > Having tagged along with the FCC on a 2 year long noise problem 
> > from the
> > > local utility company , I learned a LOT about noise finding . They 
> > were
> > here
> > > at least once a month , on the Kansas side of the line in 
> > Coffeyville .
> > >
> > > Plus I was a consulting engineer for that same power company for 5 
> > years
> > and
> > > had to handle all of the noise complaints . I could write a book 
> > on what
> > > causes problems and locating and resolving them .
> > >
> > 
> > <<SNIP>>
> > 
> > Here, the biggest problem is with sodium vapour street lights, 
> > and not
> > just one at a time. Many of the SWBC bands are overwhelmed with 
> > this,
> > leaving them unlistenable except for the strongest stations. That 
> > prompted
> > me to come up with a pre-receiver noise blanker of my own:
> > 
> > http://www.home.earthlink.net/~christrask/Paper020.html
> > 
> > 
> > Chris Trask
> > N7ZWY / WDX3HLB
> > Senior Member IEEE
> > http://www.home.earthlink.net/~christrask/
> > 
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