I am upgrading a 12 yr old theater to 4k.I am having problems with 4K HDMI extenders through a single cat5 to the projector.

Equipment:
Denon AVR-X3300w
Key Digital Extenders KD-X200ProK
JVC 4K Projector: DLA-RS500U
Comcast X1 cablebox

I tried another pair of extenders. Signal was fine until hallway lights were turned on from lighting scene keypad . Ultimately the signal stopped entirely again.

Note: I haven't done an update on the AVR yet. If the update doesn't solve it, what is this potential issue with the electrical?

What is the approximate CAT-5 cable length? Is the cable shielded? Is there any difference if you go directly from the X1 to the projector?

I meant, were both sets of extenders the same model?

Is the AV system on the same circuit as the lighting? Pop the breaker and find out if both stop working.

Yes. I wanted to rule out a bad pair of extenders.

Approximately 50' Not shielded


I will test that.

Does the projector just go dark, or does it flicker, first?

Your first problem is using key digital. Your second problem is not using Ethereal and calling Brent. Go back, check to see if the AV and lights are on the same circuit, then call Brent.

Make sure the extender set is NOT POC. POC (Power Over Cable) is not approved by Valens, who owns HDBT. POC can have "flyback" voltage which can cause damage to a source or dispaly/projector.

Many manufacturers use POC to save money. Depending on how many amps are being drawn on that circuit, there could be a brown out issue contributing to this. Brown outs can add to flyback voltage when they occur.

Always use PoE regardless of the manufacturer you purchase from. POE designs are vetted by Valens.

Good luck.

He's using the ProK model, which has a power supply at each end and is NOT POC.
But I agree with Fins, Key Digital was your 1st mistake. Try using an Ethereal or Zektor extender.

The problem I fear may not be fixable on existing wiring there. What you are describing sound a lot like EMI interference (I've ran into it a few times). And shielded cable is the best fix for this, but if you don't have a shielded cable already installed and you can't retro a new cable in... hmmm...

You need to know if power being supplied at the equipment and projector, are on the same circuit. If not, that would be my 1st priority to get those on the same circuit & dedicated (For a pre-wire, I always have the power looped back to the equipment, to plug all into the same protection/filter).
See if that lighting load is on the same circuit and find some way to get it off, if it is. What kind of lighting? What kind of lighting system?

If the TX and RX are on different phases that can definitely be an issue with a large power draw, likely on the RX side, will cause a drop out which may or may not reconnect without a power cycle.

What is the distinction between POC and PoE in this context?

Very inconsistent results. Long delay between input changes (20 seconds). Blue background stays solid when no connections is made. No flickering was noticeable.




I will try direct cat5 and will check lighting system make / manufacturer.

In this scenario, POC and POE are not an issue as Brad stated they are powered on both sides.

There could still be an issue at the site depending on how the phases are wired. If there is big power draw on the phase where the TX or RX are plugged into, you can get a momentary signal drop if the wall wart doesn't have enough power for the device.

Side note: HDBT is beginning to crack down on manufacturers using the HDBT logo on POC designs. If they don't approve the design you can't advertise the device as HDBT per their rules. Valens does not approve POC.

Why were these two facts not seen as just screaming out that they were of utmost importance to share?


Is it actually important that they be on the same circuit, which means the same breaker, or do you really mean the same phase? Every house I've ever seen has lighting and wall outlets on different breakers, but not necessarily on different phases.


Again, here, circuit or just phase?


Again, lighting systems do not all behave identically, so this is something to be named from the start.