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Author Topic: LED Wall Interference  (Read 3717 times)

Andrew Broughton

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LED Wall Interference
« on: March 10, 2019, 03:53:14 PM »

Continuing from this Excellent thread...


Attached is a scan with the LED wall off and one with it on.


Using the advice I was given, attenuating at the beltpack by 6db and using the RAD TX-8 combiner, I have been able to get clean RF for several shows now.


LED walls are not RF's friend!

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David Sturzenbecher

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LED Wall Interference
« Reply #1 on: March 10, 2019, 05:52:19 PM »

Is this a name brand product?   It is my understanding some are better then others.


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Andrew Broughton

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Re: LED Wall Interference
« Reply #2 on: March 10, 2019, 06:40:53 PM »

It is my understanding some are better then others.
It's true. The previous wall we used did not cause any RF issues. I'd rather not say the brand as I'm currently trying to work with the manufacturer to find a solution. No reason to give the company a bad name if they step up and come up with a fix for the issue.
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Erik Jerde

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Re: LED Wall Interference
« Reply #3 on: March 10, 2019, 08:20:46 PM »

It's true. The previous wall we used did not cause any RF issues. I'd rather not say the brand as I'm currently trying to work with the manufacturer to find a solution. No reason to give the company a bad name if they step up and come up with a fix for the issue.

Please let us know if they don't.  Honestly if a mfgr let a product intended for use in live production venues get out without figuring out the RF situation they maybe they deserve a bad name.  This is not a new thing, at this point it's a well understood issue, and maybe it's time to start separating the A list players from the others by naming and shaming.
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Luke Geis

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Re: LED Wall Interference
« Reply #4 on: March 10, 2019, 08:29:10 PM »

HDMI will even mess with RF when in close proximity! LED walls are not friendly at all either. I have not come across a wall yet that didn't act like some sort of Faraday cage or at least blast some RF noise. I always try and get my antenna's in front of the wall and nearer my talking heads. Trying to use low amplification for the RF is smart in order to reduce the RF noise it hears from the wall and what not. As always loudest source wins
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John Sulek

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Re: LED Wall Interference
« Reply #5 on: March 10, 2019, 11:46:46 PM »

HDMI will even mess with RF when in close proximity! LED walls are not friendly at all either. I have not come across a wall yet that didn't act like some sort of Faraday cage or at least blast some RF noise. I always try and get my antenna's in front of the wall and nearer my talking heads. Trying to use low amplification for the RF is smart in order to reduce the RF noise it hears from the wall and what not. As always loudest source wins

Just to present another viewpoint...
I have toured with reputable video vendors where I could take an iem pack and hold it against the wall during my walk around test without any ill effects.
Other off shore walls emit enough broadband energy to make the area 15feet in front of the wall useless for rf. The flexible curtain style seem to be the worst.
You get what you pay for. Higher end stuff is certified for the EU market where emissions standards are stricter.
Low amplification and not shooting through obstacles with your antenna is just good practice, video wall or not.
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Ike Zimbel

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Re: LED Wall Interference
« Reply #6 on: March 11, 2019, 10:06:15 AM »

Just to present another viewpoint...
I have toured with reputable video vendors where I could take an iem pack and hold it against the wall during my walk around test without any ill effects.
Other off shore walls emit enough broadband energy to make the area 15feet in front of the wall useless for rf. The flexible curtain style seem to be the worst.
You get what you pay for. Higher end stuff is certified for the EU market where emissions standards are stricter.
Low amplification and not shooting through obstacles with your antenna is just good practice, video wall or not.
+1000. I toured with a massive video wall and video floor last summer, and after many, many tests and 58 successful shows around the world, I can honestly say that there was NO RF interference at all. My downstage Rx antennas were practically touching the video floor, too.
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Dave Garoutte

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Re: LED Wall Interference
« Reply #7 on: March 11, 2019, 12:38:17 PM »

+1000. I toured with a massive video wall and video floor last summer, and after many, many tests and 58 successful shows around the world, I can honestly say that there was NO RF interference at all. My downstage Rx antennas were practically touching the video floor, too.
So if we're concerned with revealing the bad players, we should still be able to name the good ones, please.
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Ike Zimbel

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Re: LED Wall Interference
« Reply #8 on: March 12, 2019, 04:42:09 PM »

So if we're concerned with revealing the bad players, we should still be able to name the good ones, please.
Agreed! It was a Solotech system. Don't know much more than that...
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~Ike Zimbel~
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John Sulek

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Re: LED Wall Interference
« Reply #9 on: March 13, 2019, 11:21:56 AM »

Agreed! It was a Solotech system. Don't know much more than that...

Solotech and PRG have not caused me any problems. Not sure of the actual make of the wall modules, but I'm at the Solotech shop next week and I'll have a closer look.
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Pete Erskine

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Re: LED Wall Interference
« Reply #10 on: March 13, 2019, 03:20:04 PM »

So if we're concerned with revealing the bad players, we should still be able to name the good ones, please.

VER video walls AND TATE FLOOR LED has no appreciable rf out the front,  a little out the back.
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Andrew Broughton

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Re: LED Wall Interference
« Reply #11 on: March 13, 2019, 06:42:38 PM »

Oracle Black Widow was what we have used in the past, with no RF issues at all.
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-Andy

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Luke Geis

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Re: LED Wall Interference
« Reply #12 on: March 14, 2019, 02:18:52 AM »

I have been using a bunch of VER walls lately and they do have a little RF out the back. The front side isn't so bad at all, but I also have the antennas in front. I had issues ONCE with a VER ( ROSCO brand I believe ??? ) wall where I was not able to place the antennas out front, and needless to say, my client has not argued with me since about being certain I can place my antenna's where I want them.
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Kevin Maxwell

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Re: LED Wall Interference
« Reply #13 on: March 14, 2019, 10:01:45 AM »

There is a church that I have done some sound consulting work with and they just bought what I am told is a used (about 1.5years old) Panasonic LED video wall that is coming from I think it is Malesia. The whole deal sounds sketchy to me. It will be about 11feet high (short ceilinged but wide stage) and 72feet wide. Plus where they now have projection screens left and right of the stage there will be video walls there also. I am told the dot pitch is just under 4mm. Does anyone have any experiences with Panasonic LED video walls?

I have warned them that there could be interference problems with the wireless mics and they also in this upgrade want to add some wireless IEMs. The receiver antennas are above the suspended ceiling and the IEM transmit antenna would be off to the side near the front of the stage.   

I also warned them that although the dot pitch may work for the audience it will probably look funny when the cameras with long lenses takes a close-up shot and it sees the large pixel dot pitch wall behind in the shot. 
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Re: LED Wall Interference
« Reply #13 on: March 14, 2019, 10:01:45 AM »


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