[KCDXC] Powerline Noise

[JimRCessna at aol.com]

Hi John,
 
Man made interference (QRM) can be tracked down using the Fox Hunting  
method.  
    1.  Ask three hams to go "mobile" with their 6M rigs and Yagi  
(directional) antennas. 
    2.  The hams triangulate the interference direction/frequency.   
    3.  You use their coordinates drawing them on a street map. 
    4.  Vector each ham closer to the target source. 
    5.  As the mobile hams get closer to the target, the source RF will get 
 much stronger.  If this happens the hams will  need attenuator resistor(s) 
inline with the antenna.  This  will keep the source RF from swamping the 
receiver enabling the hams  to get much closer to the offending source.  
    6.  Repeat steps 2 through 5 until the source is identified.
This should pin-point the exact source of the RFI.  Once the exact  source 
location is known, then you can decide on how to handle it from  there.
 
73 and gud luck,
Jim - AC0KN
 
 
In a message dated 7/25/2012 7:23:41 P.M. Central Daylight Time,  
kc0deb at hotmail.com writes:



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



--
Its not how many watts you have,
its the SIZE of your  watts that matter! -- Johnny Marshall,  W0JM-SK
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