[Elecraft] OT Local QRN what is it? UPDATE!

[Don Ehrlich]

Bill,

My own treadmill causes severe interference here in the house.  I'm the only 
one who uses it so it does not affect my own radio but it blanks out any AM 
radio in the house that happens to be turned on.  I reduced the noise to an 
insignificant level by simply plugging a few microfarads of film capacitor 
into the same power outlet that the treadmill is plugged in to.  I just 
wired up the capacitors to an AC plug in a neat little package that looks 
like a big wall wart.  The interference definitely is carried throughout the 
house by the wiring.  I suspect that if your neighbor would agree to plug a 
similar module into the same outlet as is his treadmill that it would 
improve your noise situation.

Don K7FJ



> Thank you Elecraft reflector members for all of the great suggestions on 
> this QRN problem..  With your help I was able to locate the problem.   I 
> would of not found it without your help.
>
> Now, I have no idea what to do about the issue, perhaps nothing.  I now 
> know the source.
>
> It's my neighbors treadmill.  We share a power transformer (underground 
> utilities).  Although I bet the noise is from a motor arching and most 
> likely is radiating at the motor as opposed to being carried on the power 
> line.  I have hope as he is not a ultra marathon runner and his runs 
> rarely cause a QRT of over an hour.
>
> If you want to hear the sound click on the Flickr link:
> http://www.flickr.com/photos/ak5x/4279625626/in/photostream/
> http://www.flickr.com/photos/ak5x/4279577818/in/photostream/
>
> Thank you again list members for allowing me to tap the collective :)
> 73,
> Bill
> AK5X
>
>
> On Jan 16, 2010, at 1:34 PM, Bill Hammond wrote:
>
>> I have been chasing this noise in my urban neighborhood for several years 
>> now.  It usually visits during the daylight hours and stays for several 
>> hours. It has a rhythm and is across all frequencies and bands.  I have 
>> pulled the big switch in my house and the noise is still with me 
>> (listening on battery powered rigs).  Neighbors on all sides of my city 
>> sized lot  have swimming pools and my first suspicion is noise generated 
>> by circulation pumps.
>>
>> Here are two  recordings (on a K3 of coarse).  Why not ask the most 
>> discriminating radio fans in the world their opinions on the source?
>>
>> http://www.flickr.com/photos/ak5x/4279625626/in/photostream/
>>
>>
>> http://www.flickr.com/photos/ak5x/4279577818/in/photostream/
>>
>>
>> Bill Hammond-AK5X
>> wham727 at aol.com
>> ak5x at mac.com
>> ak5x at sbcglobal.net
>> K3 #69
>> K2/100 #4637
>> K1 #2033
>> KX1 #1023
>> T1
>>
>>
>>
>>
>
> Bill Hammond-AK5X
> wham727 at aol.com
> ak5x at mac.com
> ak5x at sbcglobal.net
> K3 #69
> K2/100 #4637
> K1 #2033
> KX1 #1023
> T1
>
>
>
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