[RFI] ARRL to FCC...

[Tom Thompson]

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 at 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 at comcast.net]
>>> Sent: Tuesday, March 25, 2014 2:29 PM
>>> To: Hare, Ed W1RFI
>>> Cc: rfi at 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 at 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 at contesting.com] On Behalf Of KD7JYK DM09
>>>> Sent: Friday, March 21, 2014 12:23 AM
>>>> To: rfi at 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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>