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

[Phil Hystad]

We have a treadmill and it DEFINITELY radiates noise.  It produces a 20/9 signal on my Icom 706 truck when I am sitting in the driveway and my wife is on the treadmill.  As I drive away, I can still hear the noise as it decreases in strength until about 1 mile away where it disappears into the background noise.

Our treadmill is  NordicTrack APEX 6100.  Noisy little beasts.  If I remember, they are about 20/9 peaks separated every roughly 20 KHz across all bands.  They are strongest in the 10 to 20 MHz range though.

You though have one advantage over your neighbor.  You are licensed to transmit RF and he isn't (I presume that he isn't licensed).

73, phil, K7PEH


On Jan 19, 2010, at 10:12 AM, Bill Hammond wrote:

> 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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