Bill
It took me a year to locate the noise source similar to yours. It is
worse on 80m and the frequency shifts as picture content changes. It
turned out to be next door. They had bought a 60" Samsung plasma. I took
a portable AM receiver over there, turned on their tv and it totally
blanked out the entire HF spectrum.
No amount of line cord filtering, torroids etc. does any good
whatsoever. The QRM radiates off the face of the plasma screen and can't
be tamed. The only cure is a new LCD tv!
My neighbor has not been helpful. They refuse to let a "serviceman" sent
by Samsung to look at it. I gave up 2 years ago and have managed to make
some antenna changes that help a little.
73
Steve N4LQ
On 7/5/2013 12:29 PM, Bill Hammond wrote:
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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