Vizio 4K Ultra HD causing problems on 12 meters

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  • Updated 2 years 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  Windows 8.1

Has anyone else had this problem and if so how did you handle it?
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Posted 2 years ago

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Ken - NM9P, Elmer

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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.
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Paul Christensen, W9AC, Elmer

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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
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ok. Thanks for the info. I'll try the ferrite and see if that helps

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Gayle Lawson

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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