Adam,

While power lines can be a noise source - cracked insulators, dusty 
insulators, arcing transformers, etc. - those power lines can pick up 
noise generated by some other source and carry it long distances.

A good way to track down noise sources is with a portable AM radio.  
Some have loop antennas that are very responsive to orientation, so 
looking for the null in the noise pattern can often help lead you to the 
source.

73,
Don W3FPR

Adam Koczarski wrote:
>
> I have some fairly large power lines across the street. Are they usually
> strong contributors to noise?
>
> You can see the resulting data here:
> http://www.ka7ark.com/20080111QTHnoise/pics.html
>
>
> Adam - ka7ark
>
>   
>
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