This is a bit off topic but perhaps other P3 users on this reflector have 
encountered this RFI and have some idea where it comes from and perhaps a 
remedy?  There must be a couple of thousand P3 users on this reflector.
The below is a recording and includes sound of this nasty bit of pulsating RF. 

Video recording: 

http://www.flickr.com/photos/ak5x/9214448105/

It is not always there.  When it is there in the 20-meter band there are 
siblings almost as strong at the following frequencies:

13.975

14.032-the recording

14.126

14.220

14.282

14.469

In addition, there are less strong signals that follow the pulsation; one is 
visible on the recording at 14000 (far left on the P3). They are also in the 17 
meter band. They are not in the 15 meter band or above.

I have pulled the big switch and it is still there on battery power.  My 
suspension is a neighbor with plasma television.  Is this what plasma TV looks 
like?  It is directional in nature and the strongest signal comes from a 
40-degree heading, roughly Europe from my location, or to a cluster of homes to 
my northeast. 

73, Bill AK5X

Bill Hammond
[email protected]
Bill Hammond-AK5X
[email protected]
[email protected]
K3 #69
P3 #817
KPA500 # 149
K2/100 #4637
K1 #2033
KX1 #1023
KX3 #583
W2
T1

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