Bernie I own a Panasonic 50 inch plasma and the short
answer is yes. Just yesterday I received the message
below from Panasonic (Canada). I have already
installed a large toroid on the power cord (the stock
cord IS shielded with a built it toroid and my added
toroid with 8-turns of the power cord seemed to do
nothing), an excellent surge protector (that seemed to
make things worse), put the TV on another circuit and
the rest of course is chaff thrown up by the
manufacturer (the GND system meets current codes and
the plug is wired correctly). The change of circuit
DID help somewhat. The noise introduced by the TV on
certain frequencies on the 80 metre band is
approximately 2 S-units (i.e. significant) and similar
on selected frequencies on 20 and other bands. So
it's all over the place on all the bands I work with
all the antennas I use.
I put every split choke I own on the power line along
with the large wound torroid with no change.
The TV has a built-in EMI filter at the plug (I can
see it through the vent holes) so placing an
additional Corcom filter in series seemed to make
things worse. Finally, I have a large isolation
transformer, currently serving as a doorstop in the
shack, that will be installed later to see if it
helps.
>From the Panasonic note they seem convinced that the
power cord is radiating. My fear is that the plasma
design itself is the source of the interference and
that will be significantly more difficult, if not
impossible, to resolve.
73,
Rick
VE7TK
Website: http://www3.telus.net/ve7tk
-----Original Message-----
From: IMS...Viera_Concierge
Sent: Monday, November 19, 2007 14:22
Subject: RE: Technical Support, Television - VIERA
LCD/Plasma
Thank you for contacting Panasonic Canada Inc. Please
be advised that in order for our TVs to be sold
legally in Canada they have to be certified and
approved by the FCC as well as Communications Canada
for the amount of interference allowed from the set.
If our TVs did not meet these standards we would not
be allowed to sell them. Normally any type of
interference is related to the other equipment, and
not with the TV itself.
Here are a few troubleshooting tips that our technical
staff asked us to pass along to you:
1. You can purchase a noise choke/heavy-duty ferrite
core to attach to
the power cord. This type of item can be purchased at
your local Future Shop, Best Buy, The Source by
Circuit City, etc.
2. You can purchase a superior quality surge
protector/power bar that
has noise or line conditioning (filtering).
3. If possible, plug your TV into a different circuit.
4. Ensure the grounding in the house is in proper
working condition.
5. Test the AC plug that the TV is connected or that
your power
bar/surge protector is connected to make sure it tests
OK.
We hope you find the above information helpful.
Sincerely,
Panasonic Canada Inc.
Viera Support Team
bg
------------
Subject: [TenTec] OT: RFI from Plasma TV?
Date: Tue, 20 Nov 2007 11:28:32 EST
My XYL is tired of my fixing our 25+ year-old Sony
television. I note there are some attractive prices
on plasma TVs for "Black Friday."
Does anyone know if the reports I've heard about
serious plasma TV RFI problems are true? Will my
Orion II be suffering while the family is watching?
Thanks for any thoughts.
Happy Thanksgiving, everyone.
Bernie
K5XS
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