IR Target Behind Screen?

4374 Views 6 Replies 4 Participants Last post by GreySkies, May 26, 2007

GreySkies

Discussion Starter · May 21, 2007

This weekend, I finally started installing my 2.40:1 AT screen. As part of it, I moved my center channel in-wall up to be in-line with the right and left speakers. I haven't installed an IR system yet, but have this Buffalo target and related parts awaiting installation.

Originally, I had planned on installing the target in an IR target knock-out in the center channel speaker when it was mounted underneath the screen when the plan was a standard 16:9 screen. I was thinking that putting it behind the screen in the same knock-out wouldn't be a problem, but then I started wondering if the light from the projector would somehow drown out or interfere with the IR from my remote. If that's the case, I'll just install the target under the screen or in the frame of the screen-- but behind the screen would be much easier.

Any thoughts or suggestions?

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sic0048

· #2 · May 23, 2007

I don't think it would affect it. I know light can affect IR motion detectors, but I suspect they are using a different frequency (they are trying to detect movement, not IR signals after all).

It should be an easy thing to test before installation. Simply point a projector at it and see if it sends out false signals. It doesn't need to be mounted nicely to do this test.

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GreySkies

Discussion Starter · #3 · May 23, 2007

Sounds like a plan. I'll post results back in case it could help someone else in the future.

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Targus

· #4 · May 24, 2007

Quote:
I know light can affect IR motion detectors, but I suspect they are using a different frequency

IR defines the frequency. If they both use IR, the both use the same frequency.

IR receivers re sensetive to all light, they ususally use IR filters to narrothis range. I'd suspect that shooting a bright light into an IR receiver would swamp it, reducing its sensitivity.

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GreySkies

Discussion Starter · #5 · May 25, 2007

Quote:
Originally Posted by Targus /forum/post/0

I'd suspect that shooting a bright light into an IR receiver would swamp it, reducing its sensitivity.

That's what I'm thinking. I was hoping that someone had successfully put an IR receiver behind an AT screen, but it doesn't look like it.

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strange_brew

· #6 · May 25, 2007

Quote:
Originally Posted by GreySkies /forum/post/0

That's what I'm thinking. I was hoping that someone had successfully put an IR receiver behind an AT screen, but it doesn't look like it.

I tried it with my SMX screen and it didn't work. I have it behind some speaker grill cloth right now and even that significantly reduces the range. I'll probably end up using one of THESE in my screen frame.

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GreySkies

Discussion Starter · #7 · May 26, 2007

Quote:
Originally Posted by strange_brew /forum/post/0

I tried it with my SMX screen and it didn't work. I have it behind some speaker grill cloth right now and even that significantly reduces the range. I'll probably end up using one of THESE in my screen frame.

That looks like a monster receiver.

I installed my repeater system yesterday.

Before putting it in, I taped various samples of Shearweave and Dazian CCC that I have over the receiver to see if they would have any effect. I used single thicknesses of the Shearweave and both single and double thicknesses of the Dazian. I first tried both my original equipment's factory remotes, and then my Harmony 676.

With all of the lights on in the room and no projector running, none of the materials made a difference. I was able to use the remotes from all parts of the room; I noticed no reduction of range (overall dimentions of my room-- 19'x24').

I then tried it with my projector on and the lights down. To my surprise, everything again still worked from all parts of the room. The only thing I noticed that could become an issue is that with the projector on, the led on the connecting block would dimly flash during bright scenes, so the possibility exists for interference at some point. However, the led was nowhere near as bright as when it was receiving an actual signal from a remote.

Here's the details of the install:
IR Receiver
Connecting Block
Emitters

The receiver is wired with cat5e, one pair used for ground another pair used for voltage and signal. All wiring (including power) at some point runs parallel to the media cabinet in my bar; however, power is run in grounded metallic conduit.

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