Dale,
I was in a store and just moved from tv to tv. Just the plasma tv sets
were noisy but I was only a few feet away. If I had it to do over again
I would have clamped my rf probe around the power cord to see how strong
the common mode current was. I built an RFI receiver for 40 m that has
a good meter and a 60 dB attenuator in the front end. Do they still
have plasma tv sets at Costco? I'll try to get down there tomorrow and
see. If so I'll take some more measurements and report back.
Tom W0IVJ
On 3/25/2014 7:25 PM, Dale J. wrote:
Tom,
Did you happen to check how far that radiation extended that came directly from
the set? I'm curious to know because the one I'm dealing with is about 140 or
so feet from my antenna and if that radiation doesn't carry that far then I
would suspect it's noise is being carried by either the antenna lead or line
wiring or both.
73
Dale, k9vuj
On 25, Mar 2014, at 19:28, Tom Thompson <tlthompson@qwest.net> wrote:
Ed,
I checked out a few plasma tv sets a couple of years ago with a portable
shortwave receiver. The RFI was coming right out of the front of the set which
made sense since that was where the discharge was occurring.
Tom W0IVJ
On 3/25/2014 12:31 PM, Hare, Ed W1RFI wrote:
Thanks, Dale.
We can then see if the TV is still in production. If it is no longer
manufacturered, it may be a harmful interference complaint, not a possible
emissions-limit violation.
The ARRL Lab would also be willing to provide a few filters to try, if your
neighbor is willing to work with you. Some have speculated that the noise
comes directly from the TV, and this could be true, but I still tend to think
in terms of noise coming out the AC mains and possibly also being radiated by
the shield of the incoming coaxial feed line.
-----Original Message-----
From: Dale J. [mailto:dj2001x@comcast.net]
Sent: Tuesday, March 25, 2014 2:29 PM
To: Hare, Ed W1RFI
Cc: rfi@contesting.com
Subject: Re: [RFI] ARRL to FCC...
Ed
I'll see if I can get that information from my neighbor, but it will take a
while. I have to actually get in the house and look at the back of the TV and
get the model number because I don't think they know for sure. As soon as I
get it I'll send you a email.
Tnx
73
Dale, K9VUJ
On 25, Mar 2014, at 13:04, "Hare, Ed W1RFI" <w1rfi@arrl.org> wrote:
If the ARRL Lab can get some reports involving specific model numbers, we can
do some testing and find out where these plasma sets stand. I had a report in
MD that involved two Samsung plasma TVs. One made very loud radiated noise,
while the 2nd model, also a plasma TV, was quiet.
I need reports that involve a plasma TV operating in a neighbor's home causing
harmful interference. So far, most of the reports have been about the QRZ.com
and RFI list discussions, not a specific report.
The ARRL Lab can measure conducted noise and radiated noise from devices, but
we really need to start with actual, non-general reports.
Ed Hare, W1RFI
ARRL Lab
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of KD7JYK DM09
Sent: Friday, March 21, 2014 12:23 AM
To: rfi@contesting.com
Subject: Re: [RFI] ARRL to FCC...
: Now if they would recall all the damn plasma TV's out there doing the same
: thing it would really tickle my butt cheeks...but, any such action is
: goodness!
How mant times have you contacted the FCC regarding the interference to your
licensed service?
Kurt
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