[RFI] ARRL to FCC...

Wed Mar 26 15:29:06 EDT 2014

One report I received back indicated that one plasma TV was cured with common-mode chokes, but two other models were not. All were Samsung products.

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Dale J.
Sent: Wednesday, March 26, 2014 2:44 PM
To: Tom Thompson
Cc: rfi at contesting.com Reflector
Subject: Re: [RFI] ARRL to FCC...

Tom,

I'd love to do a lot of stuff with their tv, but it's not my house and I hate to impose on them.  I have to catch the neighbor outside on a weekend and chat with him a little and maybe something might get going.  As you can see I'm a little squeamish about imposing on other people's home and property.  I guess I wouldn't like it much and therein lies my problem, hi.  But I'll work on it.  Maybe by the time I finally can do some real investigation the TV will die.

Dale, k9vuj

On 26, Mar 2014, at 13:18, Tom Thompson <tlthompson at qwest.net> wrote:

> Dale,
> 
> I checked with Costco and they only carry LED back lit TV sets now. In thinking about it further, I don't think making a measurement on the power cord with an RF current probe would be too definitive anyway because of the RFI coming from the other sets connected on the same circuit.  It would be instructive if you could conduct some tests on your neighbor's set.  Would it be possible to use a battery and quiet inverter to power the set with all other wires disconnected?  You might have to connect the cable to get the screen to light.  If you could do that and it eliminated the RFI then the line filters Ed suggested might work for you.
> 
> Just some thoughts.
> 
> Tom   W0IVJ
> 
> On 3/26/2014 2:23 AM, Dale J. wrote:
>> My next door plasma is broadband hash with various bumps along the way.  I have one of those bumps especially bad at 3.857, it's 20 db over 9 and sounds like a motor running but changing speed and sometimes stopping and starting.  The broadband hash is all over the 80 meter band and 40 too.  The upper bands are less affected. I suspect part of the noise is from a switching power supply in the plasma tv, that might be what that motor sounding noise is not sure though.  I wish it were my TV, I could then find out more how these things tick before permanently disabling it.  Makes it difficult on my USAF MARS net too.
>> 
>> Dale, k9vuj
>> 
>> 
>> 
>> On 25, Mar 2014, at 21:16, David Cole <dave at nk7z.net> wrote:
>> 
>>> Imagine thousands of little lightening bolts...  Thats Plasma TV.
>>> --
>>> Thanks and 73's,
>>> For equipment, and software setups and reviews see:
>>> www.nk7z.net
>>> for MixW support see;
>>> http://groups.yahoo.com/neo/groups/mixw/info
>>> for Dopplergram information see:
>>> http://groups.yahoo.com/neo/groups/dopplergram/info
>>> for MM-SSTV see:
>>> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>>> 
>>> 
>>> On Tue, 2014-03-25 at 18:28 -0600, Tom Thompson 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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> 

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