Vizio 4K Ultra HD causing problems on 12 meters

  • 1
  • Problem
  • Updated 1 year ago
My Vizio 4K Ultra HD seems to be causing problems on 12 meters.  The TV
is in another room about 30 feet from the radio. The noise instantly disappears when I shut the TV off. This only happens on 12.

The rig is a 6700 SSDR is 1.10.16.174  Windows 8.1

Has anyone else had this problem and if so how did you handle it?
Photo of Pat

Pat

  • 153 Posts
  • 46 Reply Likes

Posted 1 year ago

  • 1
Photo of Ken - NM9P

Ken - NM9P, Elmer

  • 3866 Posts
  • 1176 Reply Likes
The noise may be generated in the Viseo's power supply, or by the display circuitry. I would begin by adding a few turns of Mix-31 ferrite on the power cable, coax input, and any other cables attached to the TV.

I have had some monitors that calmed down with this treatment, and one other that I needed to return and replace with another brand.
Photo of Paul Christensen, W9AC

Paul Christensen, W9AC, Elmer

  • 313 Posts
  • 132 Reply Likes
You're fortunate the level is as low as it is.  I run powering for my home theatre components through a switched outlet that activates when the Denon amplifier is powered up.  When the Vizio 4K Ultra is not being watched, nothing is powered.  It's rare in this household that the set is on while I'm operating.

I've also installed #31 ferrite cores on all component power and HDMI cables.  That has diminished the spurs to a very low level when the theatre components are all on.  Single pass-through "snap-ons" are rarely adequate.  Resistive choking occurs with the square of the turns number.  That often means using very large core I.D. to enable a large number of passes through the core.

Paul, W9AC
(Edited)
Photo of Pat

Pat

  • 153 Posts
  • 46 Reply Likes
ok. Thanks for the info. I'll try the ferrite and see if that helps

73
Photo of Gayle Lawson

Gayle Lawson

  • 26 Posts
  • 14 Reply Likes
Pat:

If you are going to use" SNAP IT" clamp on cores, go with the larger sizes that you can wind multiple turns through the core.  One turn through a mix 31 core at 25 MHz is 225 ohms Z, two turns through the core is over a 1000 ohms Z, three turns over 2000 ohms.  Per K9YC RFI document (available on the net) you need at least 1000 ohms choking Z. Don't forget the HDMI cable.
Gayle K0FLY