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(Very OT)Plasma TV noise

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Chris W7CTH

(Very OT)Plasma TV noise

I am helping a friend track down some RF noise that is riding on the Cable TV line. From CableONE TV and internet service.
This noise is wiping out his 75/80 meter band.
I am posting this because some of you have had Plasma TV noise, and I don't know what that sounds like.
Can someone send be a small audio clip of what this noise sounds like. I think it is from the color frequency of the cable service.

Sorry for being so OT on this one.
Chris W7CTH

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Steve Ellington

Re: (Very OT)Plasma TV noise

Chris
Take a transistor AM radio to Wal-Mart and walk past the TV sets. When you
get near a plasma you will hear it. The LCDs are fairly quiet. Plasma set
noise comes right off the screen and is strong enough to be heard for some
distance. The only cure is to unplug the TV. They even radiate some when
turned off!
I believe my neighbor has a Plasma set. It wipes out 80 meters mostly. I
plan to find out soon and if necessary I'll help him replace it. 73
Steve
N4LQ
----- Original Message -----
From: "Chris Hembree" <[hidden email]>
To: <[hidden email]>
Sent: Friday, January 21, 2011 7:56 PM
Subject: [Elecraft] (Very OT)Plasma TV noise

>I am helping a friend track down some RF noise that is riding on the Cable
>TV line. From CableONE TV and internet service.
> This noise is wiping out his 75/80 meter band.
> I am posting this because some of you have had Plasma TV noise, and I
> don't know what that sounds like.
> Can someone send be a small audio clip of what this noise sounds like. I
> think it is from the color frequency of the cable service.
>
> Sorry for being so OT on this one.
> Chris W7CTH
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Jim Brown-10

Re: (Very OT)Plasma TV noise

In reply to this post by Chris W7CTH

On 1/21/2011 4:56 PM, Chris Hembree wrote:
> I am helping a friend track down some RF noise that is riding on the Cable TV line. From CableONE TV and internet service.

htytp://audiosystemsgroup.com/RFI-Ham.pdf

Very likely it is riding as a common mode signal on the coax leaving his
TV. Maybe on the power cable for his TV also. And perhaps radiated
directly from the TV because it is badly shielded.

Study the tutorial, then buy toroids and wind the coax around them to
form multi-turn chokes, using the winding guidelines in the tutorial.
They can fix everything but the shielding part of the problem. For that
you need the bucket treatment.

73, Jim K9YC
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n9adg

Re: (Very OT)Plasma TV noise

In reply to this post by Steve Ellington

I have a neighbor a couple of hundred yards (yes, that far) that away that
purchased a plasma approximately 15 months ago; since then, when it's on, I
have s7-s9 noise from the AM band through 80m (at various points). I offered to
purchase a new LCD display for him to replace it, but he "likes the way it looks
better than any other". I don't expect to be able to obtain relief short of FCC
intervention. It even interferes with vehicle AM radio while driving near his
house. While the ARRL recommends to work with your neighbor to try to solve the
issue (with ferrites and the like), I don't believe this advice is in tune with
today's social conventions, liability laws, "last mechanic syndrome", and the
like. I would be reluctant to touch anything on anyone else's equipment lest I
be responsible for any future real or perceived issues with proper operation. I
think the only effective solution would be to 'go nuclear' and get the FCC
involved; what I find is that I just operate less.

Quite the bummer, because my favorite band over the last few years has been
160m.

Brian N9ADG

----- Original Message ----
From: Steve Ellington <[hidden email]>
To: Chris Hembree <[hidden email]>; [hidden email]
Sent: Fri, January 21, 2011 7:23:58 PM
Subject: Re: [Elecraft] (Very OT)Plasma TV noise

Chris
Take a transistor AM radio to Wal-Mart and walk past the TV sets. When you
get near a plasma you will hear it. The LCDs are fairly quiet. Plasma set
noise comes right off the screen and is strong enough to be heard for some
distance. The only cure is to unplug the TV. They even radiate some when
turned off!
I believe my neighbor has a Plasma set. It wipes out 80 meters mostly. I
plan to find out soon and if necessary I'll help him replace it. 73
Steve
N4LQ
----- Original Message -----
From: "Chris Hembree" <[hidden email]>
To: <[hidden email]>
Sent: Friday, January 21, 2011 7:56 PM
Subject: [Elecraft] (Very OT)Plasma TV noise

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Jim Wiley-2

Re: (Very OT)Plasma TV noise

KL7DTH, Lee, and I share a QTH and rigs. One of our neighbors has a
plasma TV, and it produces very strong signals every few kHz across the
160 and 75 meter bands. We purchased a DX Engineering NCC-1 noise
canceler, and it completely removes the TV set noise. Part of the
secret is getting a noise-pickup antenna as close as possible to the
interference. We use a 40-foot (non-resonant) dipole about 10 feet
high, erected right on the property line closest to the neighbor's
house, and thus about 60 feet from the TV set in question. .

Without the noise canceler, TV set hash runs to over S9 on both 75 and
160. When the NCC-1 is on and adjusted properly, the plasma TV set
hash reduces to S1 or less on 160 meters. On 75 meters, our noise level
is S-zero. This is when using our NIVS antennas, a full-size 75 meter
vertical-firing cubical quad, or a full-wave loop on 160. . The noise
is worse on the 75 or 160 meter verticals, but we still see a several
S-unit reduction in TV set hash.

Keep in mind that such a technique works on only one noise source at a
time. If you have multiple noise sources., you could use more than one
noise reductions unit, or perhaps other methods will work for you.

I think other manufacturers offer a similar unit. I have not tried the
others, and cannot offer an opinion on how effective they are, or are not.

- Jim, KL7CC

.
Brian Moran wrote:

> I have a neighbor a couple of hundred yards (yes, that far) that away that
> purchased a plasma approximately 15 months ago; since then, when it's on, I
> have s7-s9 noise from the AM band through 80m (at various points). I offered to
> purchase a new LCD display for him to replace it, but he "likes the way it looks
> better than any other". I don't expect to be able to obtain relief short of FCC
> intervention. It even interferes with vehicle AM radio while driving near his
> house. While the ARRL recommends to work with your neighbor to try to solve the
> issue (with ferrites and the like), I don't believe this advice is in tune with
> today's social conventions, liability laws, "last mechanic syndrome", and the
> like. I would be reluctant to touch anything on anyone else's equipment lest I
> be responsible for any future real or perceived issues with proper operation. I
> think the only effective solution would be to 'go nuclear' and get the FCC
> involved; what I find is that I just operate less.
>
> Quite the bummer, because my favorite band over the last few years has been
> 160m.
>
>
>

David Cutter

Re: (Very OT)Plasma TV noise

In reply to this post by n9adg

Others have mentioned null steerers that you can buy and are very effective.
If you would rather build one for yourself, see the latest SPRAT (best value
for money radio mag - ever). On pages 6 & 7 of the latest issue 145 is
shown a simple home-build unit called the Plasma Nuller from Pat GW0VMR
whose neighbour's plasma tv wiped out his 80m band and nearly put him off
air. Jim's ferrite cures are of course the best approach from an emc point
of view (cure the source) but sometimes you can't or don't wish to approach
a neighbour. This method is probably the cheapest.

David
G3UNA

Jan Erik Holm

Re: (Very OT)Plasma TV noise

Or here
http://www.kongsfjord.no/dl/dl.htm

Jim SM2EKM
-----------------
On 2011-01-22 08:23, David Cutter wrote:

> Others have mentioned null steerers that you can buy and are very effective.
> If you would rather build one for yourself, see the latest SPRAT (best value
> for money radio mag - ever). On pages 6& 7 of the latest issue 145 is
> shown a simple home-build unit called the Plasma Nuller from Pat GW0VMR
> whose neighbour's plasma tv wiped out his 80m band and nearly put him off
> air. Jim's ferrite cures are of course the best approach from an emc point
> of view (cure the source) but sometimes you can't or don't wish to approach
> a neighbour. This method is probably the cheapest.
>
> David
> G3UNA
>
>> I have a neighbor a couple of hundred yards (yes, that far) that away that
>> purchased a plasma approximately 15 months ago; since then, when it's on,
>> I
>> have s7-s9 noise from the AM band through 80m (at various points). I
>> offered to
>> purchase a new LCD display for him to replace it, but he "likes the way it
>> looks
>> better than any other". I don't expect to be able to obtain relief short
>> of FCC
>> intervention. It even interferes with vehicle AM radio while driving near
>> his
>> house. While the ARRL recommends to work with your neighbor to try to
>> solve the
>> issue (with ferrites and the like), I don't believe this advice is in tune
>> with
>> today's social conventions, liability laws, "last mechanic syndrome", and
>> the
>> like. I would be reluctant to touch anything on anyone else's equipment
>> lest I
>> be responsible for any future real or perceived issues with proper
>> operation. I
>> think the only effective solution would be to 'go nuclear' and get the FCC
>> involved; what I find is that I just operate less.
>>
>> Quite the bummer, because my favorite band over the last few years has
>> been
>> 160m.
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Chris W7CTH

Re: (Very OT)Plasma TV noise

In reply to this post by Chris W7CTH

Thanks everyone for your help and the audio file.

Chris W7CTH

From: Monty Shultes <[hidden email]>
To: Chris Hembree <[hidden email]>
Cc:
Sent: Saturday, January 22, 2011 4:33 AM
Subject: Re: [Elecraft] (Very OT)Plasma TV noise

Chris, I have a plasma TV and experience its interference daily. It is not broadband, but at specific frequencies. It is a loud buzz.
Good hunting - 73, Monty K2DLJ

On Jan 21, 2011, at 7:56 PM, Chris Hembree wrote:

> I am helping a friend track down some RF noise that is riding on the Cable TV line. From CableONE TV and internet service.
> This noise is wiping out his 75/80 meter band.
> I am posting this because some of you have had Plasma TV noise, and I don't know what that sounds like.
> Can someone send be a small audio clip of what this noise sounds like. I think it is from the color frequency of the cable service.
>
> Sorry for being so OT on this one.
> Chris W7CTH

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KD8NNU

Re: (Very OT)Plasma TV noise

In reply to this post by n9adg

I use an ANC-4 Timewave unit for cancelling plasma tv noise, it drops the
noise by 3S units making the diofference from using the radio vs havint to
watch tv with the XYL.

----- Original Message -----
From: "Brian Moran" <[hidden email]>
To: <[hidden email]>
Sent: Friday, January 21, 2011 11:40 PM
Subject: Re: [Elecraft] (Very OT)Plasma TV noise

>I have a neighbor a couple of hundred yards (yes, that far) that away that
> purchased a plasma approximately 15 months ago; since then, when it's on,
> I
> have s7-s9 noise from the AM band through 80m (at various points). I
> offered to
> purchase a new LCD display for him to replace it, but he "likes the way it
> looks
> better than any other". I don't expect to be able to obtain relief short
> of FCC
> intervention. It even interferes with vehicle AM radio while driving near
> his
> house. While the ARRL recommends to work with your neighbor to try to
> solve the
> issue (with ferrites and the like), I don't believe this advice is in tune
> with
> today's social conventions, liability laws, "last mechanic syndrome", and
> the
> like. I would be reluctant to touch anything on anyone else's equipment
> lest I
> be responsible for any future real or perceived issues with proper
> operation. I
> think the only effective solution would be to 'go nuclear' and get the FCC
> involved; what I find is that I just operate less.
>
> Quite the bummer, because my favorite band over the last few years has
> been
> 160m.
>
>
> Brian N9ADG
>
>
>
>
> ----- Original Message ----
> From: Steve Ellington <[hidden email]>
> To: Chris Hembree <[hidden email]>; [hidden email]
> Sent: Fri, January 21, 2011 7:23:58 PM
> Subject: Re: [Elecraft] (Very OT)Plasma TV noise
>
> Chris
> Take a transistor AM radio to Wal-Mart and walk past the TV sets. When you
> get near a plasma you will hear it. The LCDs are fairly quiet. Plasma set
> noise comes right off the screen and is strong enough to be heard for some
> distance. The only cure is to unplug the TV. They even radiate some when
> turned off!
> I believe my neighbor has a Plasma set. It wipes out 80 meters mostly. I
> plan to find out soon and if necessary I'll help him replace it. 73
> Steve
> N4LQ
> ----- Original Message -----
> From: "Chris Hembree" <[hidden email]>
> To: <[hidden email]>
> Sent: Friday, January 21, 2011 7:56 PM
> Subject: [Elecraft] (Very OT)Plasma TV noise
>
>
>>I am helping a friend track down some RF noise that is riding on the Cable
>>TV line. From CableONE TV and internet service.
>> This noise is wiping out his 75/80 meter band.
>> I am posting this because some of you have had Plasma TV noise, and I
>> don't know what that sounds like.
>> Can someone send be a small audio clip of what this noise sounds like. I
>> think it is from the color frequency of the cable service.
>>
>> Sorry for being so OT on this one.
>> Chris W7CTH
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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>