[KCDXC] Powerline Noise

[John H. van Eijndt - KC0DEB]

Hi All,

Does anyone know of a quick and easy way to pinpoint a noise source?  I have this strong QRN, which drives me bunkers on 6m right now.
I can null it out by turning the beam, but it leaves me in just a certain direction. ( Mostly where the skip is not coming from - hi )
I did establish a general direction ( abt 210 deg ).  When turning the antenna, the QRN is gone quite sudden.  It starts at 120 deg,  and gradually get's stronger until it hits about 220 deg, when it subsides again...  I plotted this direction out on Google maps, and found 2 possible sources.  #1 is at the Google construction crew's "homebase", about 200 yard  behind my house. I have no idea what they have or do out there... 
The one I think might be the culprit, is a substation located at  Metropolitan and I-435.  They both are in a straight line from my house, in the direction where the noise peaks.  I made a recording of it, while turning the beam back and forth between 120 deg and 270 deg.  
Never had to deal with this kind of problem in the past, and not really sure if this is transformer noise or maybe something else..

Just wondering  if anyone knows a trick on how to determine if this is
 indeed the power station?  ( I can drive right up to it, if necessary.)

Thanks,   
John KC0DEB