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How to disable IR on XSight / ARRX18G?

 
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rsbrux



Joined: 25 Dec 2015
Posts: 32

PostPosted: Mon Mar 04, 2019 6:02 am    Post subject: How to disable IR on XSight / ARRX18G? Reply with quote

I am using an ARRX18G to control my living room TV & HiFi constellation via a Marmitek PowerMid and IR Control Pro blasters. Unfortunately, the setup does not work reliably, apparently due to multipath interference from the ARRX18G's own IR emitter(s). It works quite well if I cover the remote's IR emitter end with my hand, but this is rather impractical for ordinary use. I have tried covering the emitter end with tape, but even thick black electrician's tape is not sufficient. The RF output of the remote can easily be disabled or enabled, but I haven't found any way to control the IR output. Is there any way (short of opening the case and physically disconnecting the emitter(s)) to disable the remote's IR output and use only RF?
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The Robman
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Joined: 01 Aug 2003
Posts: 18675
Location: Chicago, IL

PostPosted: Mon Mar 04, 2019 10:39 am    Post subject: Reply with quote

I was going to suggest electrical tape but I see you have already tried that. I can't imagine that IR is getting through the tape, so I wonder if you have a leak around the edges of the tape. Try this, put the tape back on the remote and then watch the remote using a cellphone camera to see if you can see where the IR is coming from. You can see IR when viewed using a digital camera.
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Rob
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yaworski



Joined: 22 Jun 2014
Posts: 450
Location: Warsaw, Poland

PostPosted: Mon Mar 04, 2019 12:11 pm    Post subject: Reply with quote

Well, even if the tape is black in the visible light, it may still pass (maybe partially) IR light.

Try doing what Rob suggested with the phone's camera to check if it's the tape that is transparent to IR or if there's a leak around the tape.
I think that maybe some kind of a paper based tape would work better than a vinyl one.
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Marcin
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mdavej
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Joined: 08 Oct 2003
Posts: 3873

PostPosted: Mon Mar 04, 2019 1:50 pm    Post subject: Reply with quote

Nail polish and aluminum foil block IR very well. So try either painting over your tape, or putting a slightly smaller strip of foil under the tape, or use foil tape like is used on HVAC ductwork.
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rsbrux



Joined: 25 Dec 2015
Posts: 32

PostPosted: Mon Mar 11, 2019 10:05 am    Post subject: Reply with quote

Thanks for all the suggestions. If it weren't for the fact that even pointing the remote away from the equipment helps reliability, I would have though my interference theory was totally off-the wall.
I tried paper (masking) tape before moving on to electrical and duct tape (applied over the electrical tape!) However, still not as reliable as the hand over the end of the remote, even though my Galaxy's camera doesn't see any leakage, even in a darkened room. Right now I am trying a piece of thin cardboard. If that doesn't work, I'll try a thicker one. I haven't yet tried aluminum foil or nail polish. I am saving these as a last resort, as they seem trickier to apply without permanent effect on the remote.
Thanks again for the tips!
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mdavej
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Joined: 08 Oct 2003
Posts: 3873

PostPosted: Mon Mar 11, 2019 10:41 am    Post subject: Reply with quote

Are you not using the RF base designed for the Xsight (ARRE433B or REX-433)? And if not, how does your repeater work if you block the IR from the remote?

I recommend a different approach. Get a REX-433 and stick the blasters directly on the the eyes of the equipment that's giving you trouble. I've never had any multipath issues using the REX as it relays the signals instantaneously.

The REX is a nice unit that comes with 6 blasters, each on very long wires.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=ARRE433B%2CREX-433&_sacat=0
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The Robman
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Joined: 01 Aug 2003
Posts: 18675
Location: Chicago, IL

PostPosted: Mon Mar 11, 2019 10:44 am    Post subject: Reply with quote

My recommendation would be aluminum foil held in place with electrical tape.
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Rob
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rsbrux



Joined: 25 Dec 2015
Posts: 32

PostPosted: Mon Mar 11, 2019 6:57 pm    Post subject: Reply with quote

@mdavej
The Marmitek PowerMid decodes the RF from the ARRX18G and resends IR, ether directly or via IR extenders. In my case, the PowerMid is faced away from the controlled equipment and I am using the IR extender output of the PowerMid. The output goes to the IR input connector on my Onkyo receiver, which has a loopthru connector which then powers the corresponding Marmitek IR extenders pasted on or near the IR receivers of the other equipment to be controlled. However, the extenders are translucent and do not completely block extraneous IR, which seems to be causing the problem. It is also physically impossible to paste one directly on the IR sensor of my TV; the extender is attached to the base, a few centimeters away from the sensor.

@The Robman
Thanks for your usual cogent advice. 0.3 mm cardboard didn't work, but 1.7mm cardboard is doing a pretty good (if not perfect) job, at least better than the combination of duct tape and electrical tape. In the interest of a more esthetic solution, I will try a cardboard and aluminum foil sandwich.
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