Flat Screen TV's and RF

Discussion in 'Ham Radio Discussions' started by N8QGC, May 5, 2012.

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  1. N8QGC

    N8QGC Ham Member QRZ Page

    Just wondering can anyone give me any insight into which brands of Flat Screen TV's are the least susceptable to RFI? I currently have a 36 inch Magnavox Tube type dinosaur that sits in our living room. Unfortuantly on my city lot I had to run my G5RV over the house and one leg runs over top of the living room.

    When I transmit on certain bands it shuts the TV off as it's poorly RF shielded.

    I've tried RF chokes common mode suppression and even tin foil. Nothing seems to help.

    My solution is to replace this TV with a 55 inch Flat Screen.

    So any feedback on best brands and RFI problems/concerns would be great.

    73 de John N8QGC
  2. WA6FX

    WA6FX Ham Member QRZ Page

    Plasma TV's can cause real problems, LCD's are usually quietest. I have a new Samsung edge lit 46" LED flat screen that replaced a Mitsubishi that was creating all kinds of RFI headaches.
    The new LED is in fairly close proximity to my antenna (ground mounted vertical on a small lot) and no problems RX or TX w/ 100W.
    Last edited: May 5, 2012
  3. NM5TF

    NM5TF Ham Member QRZ Page

    we had a 63 inch Samsung plasma that was not bothered by my Tx,
    but was a HORRIBLE RFI generator....thankfully it died...we replaced
    it with a Vizio LCD that neither generates or is bothered by RFI....

    seems like either LED or LCD models are immune.....stay away from
    Plasma models if RFI is a concern....

    hope this helps
  4. KB0VXN

    KB0VXN Ham Member QRZ Page

    We have two Vizio LED's....never had rfi problems either way.

  5. WA8LGM

    WA8LGM Ham Member QRZ Page

    I have a RCA 46 inch LED tv. I have no problems with it at all. Its located on the other side of the wall from my office where the ham gear is. I have never heard any noise out of it.
    Just a thought.
  6. KB1NXE

    KB1NXE Platinum Subscriber Platinum Subscriber QRZ Page

    I have an LG 47 LCD w/LED backlighting. You'll likely find the LCD TVs that have an RFI problem have cold cathode illuminated. LED backlighting is clearer and more energy efficient. Let alone low voltage without high voltage (cold cathodes run about 150V IIRC) switching and arcing issues.

    FWIW, I love my LG. It has one of the best pictures in the price range and looks great to boot.

    Amazon had great prices and blisteringly fast shipping:

  7. M0GVZ

    M0GVZ XML Subscriber QRZ Page

    I have a Panasonic TXP42G20 Plasma. Once you get more than 8ft away, there's no detectable RFI being emitted from it on the SW bands using an AM radio and it has no trouble with nearby transmitters - even a slinky dipole on 20m in the same room....
  8. N5AL

    N5AL Ham Member QRZ Page

    Buy from a store with a good return policy, so you can exchange the TV for another if it causes you RFI problems.

    I recently gave my plasma TV to my 11 year-old nephew/godson. He is thrilled to have a TV in his bedroom. The TV has a beautiful image: too bad it's a major RFI polluter.

    BTW, my nephew lives several miles miles from me, which is a safe distance away. I would have considered giving the RFI-polluting, plasma TV to my niece, but she lives next door to me!!!
  9. K0RGR

    K0RGR Premium Subscriber QRZ Page

    I have had a Westinghouse LCD and currently have a big LG LED. No RFI in either direction, and the TV antenna is only about 10 feet from one of my HF antennas. I do have other noise sources in the vicinity that may be masking lower level noise, however. Hunting that down is that the top of my to-do list today, too.
  10. N0WYO

    N0WYO Ham Member QRZ Page

    So do we. They seem to be a sturdy set. I've had one for 18 months and the other for 2 years. No problems at all. Not even a flinch on the display when I key up.
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