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K3 & Plasma Question

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Jim Bennett

K3 & Plasma Question

This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!

We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh….

We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!

So, is there anyone in this group who has a Panasonic TC-P65VT50 TV who can say yes or no to the QRN issue?

Thanks, Jim / W6JHB
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Don Wilhelm-4

Re: K3 & Plasma Question

Jim,

Plasma TVs are wideband signal generators, and almost certain to cause
QRN. Go for a good LED TV and things will be interference free. Yes,
the plasma TVs are less expensive, but if you value your on-air time
while the XYL watches TV, you will need to use something other than a
plasma TV.

73,
Don W3FPR

On 9/10/2012 1:57 PM, Jim Bennett wrote:
> This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!
>
> We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh….
>
> We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!
>

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mzilmer

Re: K3 & Plasma Question

Plasma TVs should be made explicitly illegal, because of the interference issues they cause on HF. But the reverse is also often true.

I had a neighbor who bought a plasma TV. The dern thing put out all sorts of QRM and gudge around 4 MHz (near one of the MARS frequencies). As I operated more and more often on that MARS freq, I found that the interference decreased over time (at least when I was on the air and transmitting).

Much later, the neighbor reported that she'd taken the TV back to the retailer because right around 5 PM every day she couldn't receive anything for a few seconds at a time. She assumed it was defective (it was) and they gave her credit for another (LED) TV. We live in an area with large setbacks, so her plasma set was more than 100 feet from the antenna. She's had no problems with the LED TV.

Matt Zilmer, W6NIA
In status quo voluntas non sufficit

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm
Sent: Monday, September 10, 2012 11:20 AM
To: Jim Bennett
Cc: Elecraft Reflector Reflector
Subject: Re: [Elecraft] K3 & Plasma Question

Jim,

Plasma TVs are wideband signal generators, and almost certain to cause QRN. Go for a good LED TV and things will be interference free. Yes, the plasma TVs are less expensive, but if you value your on-air time while the XYL watches TV, you will need to use something other than a plasma TV.

73,
Don W3FPR

On 9/10/2012 1:57 PM, Jim Bennett wrote:
> This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!
>
> We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh....
>
> We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!
>

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Guy, K2AV

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

If you are a ham, just say NO to plasma TV. Even if they have a generally
successful shielding scheme, YOURS could just have one little defective
connection whose only outcome is noise. Techs will never be able to fix
it. You have to take it apart to work on it. Taking it apart disconnects
the shielding.

And the other thing, if you insist on torturing yourself by buying plasma,
get any guarantee IN WRITING, signed by someone in the store who has
AUTHORITY. That Best Buy manager can be drop-kicked to another store or
out of a job in a heartbeat. New guy, or someone from a different shift,
and he's going to look in some book to see what he can do, and maybe won't
do that.

73, Guy.

On Mon, Sep 10, 2012 at 1:57 PM, Jim Bennett <[hidden email]> wrote:

> This is only slightly off-topic, but since I do operate a K3, it still
> fits - kinda!
>
> We have two plasma TV's in our home. One is a ten year old Sony 42 inch
> unit. The other one is a two year old Samsung 63 inch TV. They are about 50
> feet from the shack, and only eight feet away from each other - two
> different rooms. The Sony has never, ever caused any sort of QRN on any of
> the ham bands. Because of that, we purchased the Samsung unit right after
> moving into this QTH. I did not have an HF antenna installed for several
> months after moving in - when I finally did get one put up, I saw some ugly
> QRN on most of the HF bands. However, at the time I was not aware of the
> "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be
> from the PG&E high power lines that are pretty close to the house. By the
> time I put two & two together and figured out that the ugly noise was from
> this Samsung TV, it was already out of warranty. Ughhh….
>
> We are now in the market for another TV, and have been looking at a very
> nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best
> Buy sales manager that IF we do buy it and IF it causes QRN to the HF
> bands, it is coming right back. He said that is no problem. But, if I can
> query this group to see if anyone else has one of these TV's, I may be able
> to avert a lot of work ahead of time. Our second choice would be an LED
> set, but after seeing plasma and LED side by side, playing the exact same
> content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE
> K3!!!
>
> So, is there anyone in this group who has a Panasonic TC-P65VT50 TV who
> can say yes or no to the QRN issue?
>
> Thanks, Jim / W6JHB
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
>

Don Wilhelm-4

Re: K3 & Plasma Question

In reply to this post by mzilmer

Matt,

Quite interesting. In my situation, the nearest neighbor is 1/4 mile
away, so hopefully the effects of a plasma TV will not be apparent to
me. When I went shopping for a TV, I avoided plasma and went with the
LED screen. That was the lowest power consumption TV, and since the XYL
watches a LOT of TV, keeping the AC power consumed to a minimum was an
important parameter.

The LED displays do not create any interference as far as I can determine.

73,
Don W3FPR
On 9/10/2012 2:29 PM, Matthew Zilmer wrote:

> Plasma TVs should be made explicitly illegal, because of the interference issues they cause on HF. But the reverse is also often true.
>
> I had a neighbor who bought a plasma TV. The dern thing put out all sorts of QRM and gudge around 4 MHz (near one of the MARS frequencies). As I operated more and more often on that MARS freq, I found that the interference decreased over time (at least when I was on the air and transmitting).
>
> Much later, the neighbor reported that she'd taken the TV back to the retailer because right around 5 PM every day she couldn't receive anything for a few seconds at a time. She assumed it was defective (it was) and they gave her credit for another (LED) TV. We live in an area with large setbacks, so her plasma set was more than 100 feet from the antenna. She's had no problems with the LED TV.
>
> Matt Zilmer, W6NIA
> In status quo voluntas non sufficit
>
>
> -----Original Message-----
> From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Monday, September 10, 2012 11:20 AM
> To: Jim Bennett
> Cc: Elecraft Reflector Reflector
> Subject: Re: [Elecraft] K3 & Plasma Question
>
> Jim,
>
> Plasma TVs are wideband signal generators, and almost certain to cause QRN. Go for a good LED TV and things will be interference free. Yes, the plasma TVs are less expensive, but if you value your on-air time while the XYL watches TV, you will need to use something other than a plasma TV.
>
> 73,
> Don W3FPR
>
> On 9/10/2012 1:57 PM, Jim Bennett wrote:
>> This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!
>>
>> We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh....
>>
>> We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!
>>
> ______________________________________________________________
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Bill K9YEQ

Re: K3 & Plasma Question

I like the idea of causing interference to Plasma, I know, which is a
terrible thing to say. Matt's "solution" seems so perfect.

73,
Bill
K9YEQ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Don Wilhelm
Sent: Monday, September 10, 2012 1:39 PM
To: Matthew Zilmer
Cc: Jim Bennett; Elecraft Reflector Reflector; [hidden email]
Subject: Re: [Elecraft] K3 & Plasma Question

Matt,

Quite interesting. In my situation, the nearest neighbor is 1/4 mile away,
so hopefully the effects of a plasma TV will not be apparent to me. When I
went shopping for a TV, I avoided plasma and went with the LED screen. That
was the lowest power consumption TV, and since the XYL watches a LOT of TV,
keeping the AC power consumed to a minimum was an important parameter.

The LED displays do not create any interference as far as I can determine.

73,
Don W3FPR
On 9/10/2012 2:29 PM, Matthew Zilmer wrote:
> Plasma TVs should be made explicitly illegal, because of the interference
issues they cause on HF. But the reverse is also often true.
>
> I had a neighbor who bought a plasma TV. The dern thing put out all sorts
of QRM and gudge around 4 MHz (near one of the MARS frequencies). As I
operated more and more often on that MARS freq, I found that the
interference decreased over time (at least when I was on the air and
transmitting).
>
> Much later, the neighbor reported that she'd taken the TV back to the
retailer because right around 5 PM every day she couldn't receive anything
for a few seconds at a time. She assumed it was defective (it was) and they
gave her credit for another (LED) TV. We live in an area with large
setbacks, so her plasma set was more than 100 feet from the antenna. She's
had no problems with the LED TV.

>
> Matt Zilmer, W6NIA
> In status quo voluntas non sufficit
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Monday, September 10, 2012 11:20 AM
> To: Jim Bennett
> Cc: Elecraft Reflector Reflector
> Subject: Re: [Elecraft] K3 & Plasma Question
>
> Jim,
>
> Plasma TVs are wideband signal generators, and almost certain to cause

QRN. Go for a good LED TV and things will be interference free. Yes, the
plasma TVs are less expensive, but if you value your on-air time while the
XYL watches TV, you will need to use something other than a plasma TV.
>
> 73,
> Don W3FPR
>
> On 9/10/2012 1:57 PM, Jim Bennett wrote:
>> This is only slightly off-topic, but since I do operate a K3, it still
fits - kinda!
>>
>> We have two plasma TV's in our home. One is a ten year old Sony 42 inch
unit. The other one is a two year old Samsung 63 inch TV. They are about 50
feet from the shack, and only eight feet away from each other - two
different rooms. The Sony has never, ever caused any sort of QRN on any of
the ham bands. Because of that, we purchased the Samsung unit right after
moving into this QTH. I did not have an HF antenna installed for several
months after moving in - when I finally did get one put up, I saw some ugly
QRN on most of the HF bands. However, at the time I was not aware of the
"plasma effect" that I am now. When I heard the QRN, I "assumed" it to be
from the PG&E high power lines that are pretty close to the house. By the
time I put two & two together and figured out that the ugly noise was from
this Samsung TV, it was already out of warranty. Ughhh....
>>
>> We are now in the market for another TV, and have been looking at a very
nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best
Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands,
it is coming right back. He said that is no problem. But, if I can query
this group to see if anyone else has one of these TV's, I may be able to
avert a lot of work ahead of time. Our second choice would be an LED set,
but after seeing plasma and LED side by side, playing the exact same
content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE
K3!!!

>>
> ______________________________________________________________
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> list: http://www.qsl.net/donate.html
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> list: http://www.qsl.net/donate.html
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k6dgw

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

On 9/10/2012 11:20 AM, Ron D'Eau Claire wrote:

> longer and use less power. The new active matrix LED backlighting system
> (changes the brightness of the backlight LED's as needed to support the
> image content in each part of the picture) provides a huge contrast ratio
> over an LCD alone.

Indeed! We finally bought a Panasonic LCD/LED because of that. I don't
have any color vision, and in the store, the contrast ratio of it over
all the others was striking for me. It was a little spendy, but now we
both can enjoy HD, high-contrast TV. I've always thought the plasma TV
idea belonged in the same trash can as the 21 MHz TV IF of the
50's/60's. :-)

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org

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Dave KK7SS

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

My neighbor bought a large-screen Plasma TV about 6 months ago.
When he's watching it (most of the day!) it blocks out large chunks of 80m and 40M

His TV is about 40ft from the middle of my dipole and about 30ft from my gear.

FWIW

--
Dave G KK7SS
Richland, WA

KX3 #097
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W5RDW

Re: K3 & Plasma Question

I also had a Plasma TV, a 42 inch Visio purchased many years ago, and had the terrible RFI problem on 80 meters especially. My 80 meter dipole hangs across the house , one leg over the plasma. I never operated much in the lower bands where the RFI was worse, but figured I would eventually get a LCD or LED TV and the problem would go away.

Well, the day came and I was itching to get a larger screen TV. I saw another Visio (they have good clear displays), so I thought I would opt for a LCD 55 incher. i had forgotten about the RFI problem with the plasma, but heck, this is a LCD so it should not have any problem. I got it home and really liked it. Well, as you might expect, I was on 80 meters working some CW one night and on the P3, I saw these little spikes, maybe 160 KHz apart (-85 dBm +/- a few dB). I hollered at my wife to turn off the TV and well, you guessed it, the spikes went away.

So, in my case, an LCD TV does have some RFI, although not as much as the plasma. Interesting, a 32 inch LCD Visio in the shack has no RFI as best I can tell and the dipole goes directly over the shack.

Roger W5RDW

Steve Ellington

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

It took me a year to track down the horrible racket from a plasma set.
80 meters was just wiped out. Finally I traced it to my next door neighbor
who bought a
60" Samsung Plasma about the same time my QRM started. I took my portable
radio over and it totally wipes out everything on all bands.
The RFI comes off the face of the screen, not the power supply so no amount
of filtering will help. I bought the MFJ noise canceling device, 1026 as I
recall. It works great but of course just something more to fiddle with.
Without the bandscope it would be really hard to find the nulls. One setting
took care of all bands!
I rearranged my antennas and away from his house so that helped a tad but I
can still hear it.

I had a close relationship with Samsung because I bought thoursands of their
sets for the bank I worked for. I talked to the sales rep and it was a waste
of time. Eventually the neighbor became uncooperative.

steve N4LQ
----- Original Message -----
From: "Jim Bennett" <[hidden email]>
To: "Elecraft Reflector Reflector" <[hidden email]>
Sent: Monday, September 10, 2012 1:57 PM
Subject: [Elecraft] K3 & Plasma Question

This is only slightly off-topic, but since I do operate a K3, it still
fits - kinda!

We have two plasma TV's in our home. One is a ten year old Sony 42 inch
unit. The other one is a two year old Samsung 63 inch TV. They are about 50
feet from the shack, and only eight feet away from each other - two
different rooms. The Sony has never, ever caused any sort of QRN on any of
the ham bands. Because of that, we purchased the Samsung unit right after
moving into this QTH. I did not have an HF antenna installed for several
months after moving in - when I finally did get one put up, I saw some ugly
QRN on most of the HF bands. However, at the time I was not aware of the
"plasma effect" that I am now. When I heard the QRN, I "assumed" it to be
from the PG&E high power lines that are pretty close to the house. By the
time I put two & two together and figured out that the ugly noise was from
this Samsung TV, it was already out of warranty. Ughhh….

We are now in the market for another TV, and have been looking at a very
nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best
Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands,
it is coming right back. He said that is no problem. But, if I can query
this group to see if anyone else has one of these TV's, I may be able to
avert a lot of work ahead of time. Our second choice would be an LED set,
but after seeing plasma and LED side by side, playing the exact same
content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE
K3!!!

So, is there anyone in this group who has a Panasonic TC-P65VT50 TV who can
say yes or no to the QRN issue?

Thanks, Jim / W6JHB

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Stewart@twinwood

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

Experiences in the UK and across Europe are that Panasonic Viera Plasma TV's are particularly bad at causing interference to the radio spectrum.

There are more energy efficient and pollution free alternatives available.

73
Stewart G3RXQ
On Mon, 10 Sep 2012 10:57:11 -0700, Jim Bennett wrote:

> This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!
>
> We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh....
>
> We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!
>
> So, is there anyone in this group who has a Panasonic TC-P65VT50 TV who can say yes or no to the QRN issue?
>
> Thanks, Jim / W6JHB
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Eric Swartz - WA6HHQ

Re: K3 & Plasma Question

Administrator

Time to end the OT Plasma thread to keep list signal to noise under control.

Thread Summary: Plasma TVs = Bad Interference ;-)

[end of Thread]

73,

Eric
List moderator ---
www.elecraft.com

On 9/10/2012 3:27 PM, Stewart wrote:

> Experiences in the UK and across Europe are that Panasonic Viera Plasma TV's are particularly bad at causing interference to the radio spectrum.
>
> There are more energy efficient and pollution free alternatives available.
>
> 73
> Stewart G3RXQ
> On Mon, 10 Sep 2012 10:57:11 -0700, Jim Bennett wrote:
>> This is only slightly off-topic, but since I do operate a K3, it still fits - kinda!
>>
>> We have two plasma TV's in our home. One is a ten year old Sony 42 inch unit. The other one is a two year old Samsung 63 inch TV. They are about 50 feet from the shack, and only eight feet away from each other - two different rooms. The Sony has never, ever caused any sort of QRN on any of the ham bands. Because of that, we purchased the Samsung unit right after moving into this QTH. I did not have an HF antenna installed for several months after moving in - when I finally did get one put up, I saw some ugly QRN on most of the HF bands. However, at the time I was not aware of the "plasma effect" that I am now. When I heard the QRN, I "assumed" it to be from the PG&E high power lines that are pretty close to the house. By the time I put two & two together and figured out that the ugly noise was from this Samsung TV, it was already out of warranty. Ughhh....
>>
>> We are now in the market for another TV, and have been looking at a very nice Panasonic 65" Plasma set, model TC-P65VT50. I've already told the Best Buy sales manager that IF we do buy it and IF it causes QRN to the HF bands, it is coming right back. He said that is no problem. But, if I can query this group to see if anyone else has one of these TV's, I may be able to avert a lot of work ahead of time. Our second choice would be an LED set, but after seeing plasma and LED side by side, playing the exact same content, I want to stay with plasma - BUT ONLY IF IT DOESN"T SCREW UP THE K3!!!
>>
>> So, is there anyone in this group who has a Panasonic TC-P65VT50 TV who can say yes or no to the QRN issue?
>>
>> Thanks, Jim / W6JHB
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>> Please help support this email list: http://www.qsl.net/donate.html
>
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Jim Brown-10

Re: K3 & Plasma Question

In reply to this post by W5RDW

On 9/10/2012 2:45 PM, W5RDW wrote:
> So, in my case, an LCD TV does have some RFI, although not as much as the
> plasma. Interesting, a 32 inch LCD Visio in the shack has no RFI as best I
> can tell and the dipole goes directly over the shack.

See my RFI tutorial to understand how RFI happens and how to fix it.
You probably need multi-turn ferrite chokes on some or all of the wiring
connected to the TV. I would start with the RF cable and the power cable.

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

73, Jim K9YC
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Edward R Cole

Re: K3 & Plasma Question

In reply to this post by Jim Bennett

The solution is to buy the neighbor a nice large-screen LCD TV with
the condition that you get his plasma TV in trade. Sell the plasma
TV to someone a long way from you. You probably will not net
completely your costs in this.

I work in a big-box store selling electronics and convince my
customers that LCD/LED is what they want. We have one plasma TV
model for the some 50 TV's we sell.

73, Ed - KL7UW
PS my Samsung 42-inch LCD/LED is 40-foot directly below my
43x122-foot inverted-L with no detectable TVI on any band with my K3 or KX3.

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N0AZZ

Re: K3 & Plasma Question

I have a 27" Samsung LED-LCD TV about 3' from coax, radios an Alpha 87A amp
right above them on a shelf built for it. It is also 24' under one leg of my
270' Inverted V 160m antenna @ 2k+ and no problems at all.

&3,
Fred/N0AZZ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Edward R Cole
Sent: Tuesday, September 11, 2012 2:39 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 & Plasma Question

The solution is to buy the neighbor a nice large-screen LCD TV with the
condition that you get his plasma TV in trade. Sell the plasma TV to
someone a long way from you. You probably will not net completely your
costs in this.

I work in a big-box store selling electronics and convince my customers that
LCD/LED is what they want. We have one plasma TV model for the some 50 TV's
we sell.

73, Ed - KL7UW
PS my Samsung 42-inch LCD/LED is 40-foot directly below my 43x122-foot
inverted-L with no detectable TVI on any band with my K3 or KX3.

______________________________________________________________
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Post: mailto:[hidden email]

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vk4tux

K3 & Plasma Question

I thought I saw 11 hours ago;

[Elecraft] K3 & Plasma Question Eric Swartz - WA6HHQ, Elecraft Mon Sep 10
20:29:36 EDT 2012

"Time to end the OT Plasma thread to keep list signal to noise under
control.

Thread Summary: Plasma TVs = Bad Interference ;-)

[end of Thread]

73,

Eric
List moderator ---
www.elecraft.com"

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Fred Smith
Sent: Tuesday, 11 September 2012 8:40 PM
To: 'Edward R Cole'; [hidden email]
Subject: Re: [Elecraft] K3 & Plasma Question

I have a 27" Samsung LED-LCD TV about 3' from coax, radios an Alpha 87A amp
right above them on a shelf built for it. It is also 24' under one leg of my
270' Inverted V 160m antenna @ 2k+ and no problems at all.

&3,
Fred/N0AZZ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Edward R Cole
Sent: Tuesday, September 11, 2012 2:39 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 & Plasma Question

The solution is to buy the neighbor a nice large-screen LCD TV with the
condition that you get his plasma TV in trade. Sell the plasma TV to
someone a long way from you. You probably will not net completely your
costs in this.

I work in a big-box store selling electronics and convince my customers that
LCD/LED is what they want. We have one plasma TV model for the some 50 TV's
we sell.

73, Ed - KL7UW
PS my Samsung 42-inch LCD/LED is 40-foot directly below my 43x122-foot
inverted-L with no detectable TVI on any band with my K3 or KX3.

______________________________________________________________
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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Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
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______________________________________________________________
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