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

[Bob]

If it were me I do not think I would furnish or propose any home made 
device as a solution.
Were there to be a failure in the treadmill shorty thereafter you can be 
sure where the blame
would be placed.  A really worse case scenario would be a fire.   Then 
it would be a let the law
suits begin situation.

I would look around  for some type of commercial line filter  that could 
be placed in the line.
To keep the money in the Ham marketplace here is a possible if the 
treadmill is under a 7 amp
load:

 http://www.arraysolutions.com/Products/nqnaclinefilter.htm

I have no experience with this unit, or financial interest in it 
either.   But if the interference was
real aggravating to me I'd invest in a potential solution and propose 
something along these lines
as a  "loaner". 

73,
Bob
K2TK


Don Ehrlich wrote:
> 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
>>
>>
>>