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Author Topic: Plasma TV Interference on HF Bands  (Read 1042 times)
N9VX
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Posts: 20




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« on: December 15, 2009, 04:08:56 PM »

Are there any Plasma TV make and models that do not cause interference to HF frequencies or are they all a problem?

I am shopping for a new TV!!

Thanks,

Joe  N9VX
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N4NYY
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Posts: 4758




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« Reply #1 on: December 15, 2009, 04:16:20 PM »

LCD
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K6AER
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« Reply #2 on: December 15, 2009, 05:57:30 PM »

LCD
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WA1RNE
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« Reply #3 on: December 15, 2009, 06:01:23 PM »

Yes, there are some models that do not emit significant interference.

 But since manufacturers are not required to measure emissions on the HF bands, the only way to tell is to take a portable AM broadcast or SW radio to the store and check it out yourself.

 I've been reporting Plasma interference issues on the RFI forum since 2006 as well as pointing out in various articles that Plasma RFI is probably more of an issue than BPL would ever be.

 Several hams have indicated the TV manufacturer causing RFI but most don't indicate a specific model so you must check it yourself in-store.

 ...and yes, LCD's are generally immune from this issue as the screen technology is totally different.

 Plasma TV's use a HV source to ignite gasses in individual pixels to create a display. The currents generated in that process are in the HF range and are emit EMI directly from the screen - a slight challenge to filter for our purposes.

 An LCD runs a white backlight and selectively addresses "electronic" shutters which polarize the red, blue and green subpixels to pass through the required colors and intensity.

 
 ...WA1RNE
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WA7IRY
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« Reply #4 on: December 15, 2009, 07:45:52 PM »

Again, LCD...   ;-)

Here's a hint:  When you purchase, make sure you can return it FOR ANY REASON.  (Try stores like Costco, for example, which has an totally awsome, hassle-free return policy.)

Keep in mind that when you talk with the store sales people about things like EMI, RFI, etc., about all you'll get are blank looks.  They won't understand that as a "valid" reason to return a TV, so you need to confirm the unconditional return policy before you buy.  

As long as you can take it home and just turn it on (connected to your antenna or cable box), you'll know in a matter of seconds if it's going to give you problems.

We've purchased four LCD sets in the last two years, i.e. two 32-inch Toshibas, a 54-inch Vizio, and a 21-inch ViewSonic computer monitor.  All four turned out to be were totally RFI-free.  I couldn't even get get static by using a hand-help BC portable held right next to the screens.  

Good luck with your upgrade.

--Rod   N7ZR   (ex-WA7IRY)
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WX7G
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« Reply #5 on: December 16, 2009, 06:31:54 AM »

LCD.
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AI7RR
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Posts: 164




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« Reply #6 on: December 16, 2009, 10:31:43 AM »

My Panasonic 50" plasma is a wonderful unit...until I turn the radio on. I bought the tv before I got back into radio. My Panasonic LCD is absolutely clean. I'm very curious to see how the newer LED technology will fair with radio.

I've heard of plasma units that do not cause the interference. Try doing a search on this site for more threads. As I recall there were some non-interfering units listed.

73,,Roger
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WA1RNE
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« Reply #7 on: December 16, 2009, 02:00:05 PM »

RE: Plasma TV Interference on HF Bands      
by WA7IRY on December 15, 2009    


Again, LCD...

Here's a hint: When you purchase, make sure you can return it FOR ANY REASON.


 >>> If you take a portable AM radio to the store and ask them to turn off the other sets for a minute you will know if the Plasma set in question is an RFI generator or not - without having to purchase it - and without restricting yourself to only LCD sets.

 There are some key advantages to owning a Plasma set vs LCD:

 1) Cost - especially for screen sizes 55" and larger a Plasma set can be considerably cheaper.

 2) Selection.  Again, for sets 55" and larger, there are many more Plasma sets to choose from.

 3) Display quality. IMO, many Plasmas have a more natural looking picture than LCD's. The colors of some LCD's seem to have an almost neon glow to them, much like the glow of their fluorescent backlighting.

 The best way to decide is to put one next to the other, which is what I did.

 One of the key advantages for LCD's is lower power consumption.

 All selection criteria vary by make and model so you have to get out there and check them out.

 Use the internet to derive your list of candidates based on cost, picture size, features of interest, etc., then take your list to the store and get your hands dirty.

 ...WA1RNE
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N9VX
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« Reply #8 on: December 21, 2009, 01:13:21 PM »

Thanks to all that replied to my question. I purchased a 55" LG LCD with LED back-lite, 240hz refresh rate.


Joe  N9VX
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KI4SDY
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Posts: 1452




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« Reply #9 on: December 22, 2009, 06:35:04 AM »

Another reason that you may not want a plasma TV, other than RFI, is the heat it radiates. If you live in a warm climate, like Florida, you are working your air conditioner against a heater that will probably be on 8 hours a day. The electric bill will be very ugly!
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