[RFI] Strange noise on 80m

[Lee STRAHAN]

Martin,
  This looks almost exactly like the noise I get from the wood products manufacturer next door. They use VFD drives on several motors there. One is 100 horsepower.
I get the interference also in the 75 to 80 meter band. The noise is also very bad just driving by their plant with an AM radio at 1700 kHz.
 I am getting my ducks in a row getting ready to approach them.
Lee  K7TJR  OR

>>
Here appeared a strange broadband noise over whole 80m band. No birdies, sounds like an extreme QRN. Screenshots from my Elecraft P3 are here:

Dec. 4 3503 kHz
http://www.ok1rr.com/public/80m.png

today 3537 kHz
http://www.ok1rr.com/public/80m1.png

I will be grateful for any advice (possible source, how to locate etc.).

73,
Martin, OK1RR
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