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

[Don Wilhelm]

Bob,

You are so right about that.  I might further state that anything which 
plugs into the AC outlet must have UL or other testing lab approval 
stickers on it, so giving a neighbor an unapproved homebrew device opens 
to door for liability.

73,
Don W3FPR

Bob wrote:
> 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
>>>
>>>
>>>     
>>>       
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