Will mains electric cable affect hdmi cables?

Craterloads

Craterloads

Craterloads

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We are trying to run some Ethernet and hdmi cables under floorboards along a channel already there for mains electric cables like a bunch of 6 thick mains cable.

Tested hdmi cables outside and were working fine. Ran underneath along with mains cables and no longer working.

15m fibre hdmi cables so would have thought it should be free from interference.

The Ethernet cables seems to be working fine.
 
The only issue you might have is interference, but I'd be rather surprised if you do. Can you not test it for a bit before putting the floorboards down?
 
Diddums said:
The only issue you might have is interference, but I'd be rather surprised if you do. Can you not test it for a bit before putting the floorboards down?
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We put one in, didn’t work. Tested the other outside, removed non working one and put replacement in. And it reversed, the non working one started working outside, and the working one stopped working inside!
 
IIRC if they are alongside each other for a long run you can get issues, as has been suggested possibly a cable with better shielding might work.

A google suggests that the maximum suggested run for 4k hdmi under normal conditions is around 3m.
 
Having slept on it, realised I’ve been a bit of a donut.

The cables are directional!

So we’ve been testing them outside and working, and from wherever we’ve tested have started feeding the cable through to the other side ending up on opposite direction!

To be fair to me I’ve never used a directional hdmi cable, it’s just these fibre hdmi cables that are.
 
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If they’re fibre cables, have you checked whether you’ve got them plugged in the right way? They’re usually/always directional

Edit: at least you have it working!
 
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You can get something called cross-talk. Would recommend shielded cables.

Edit: just saw you were using directional cables. That would do it too! :cry:
 
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Craterloads said:
Having slept on it, realised I’ve been a bit of a donut.

The cables are directional!

So we’ve been testing them outside and working, and from wherever we’ve tested have started feeding the cable through to the other side ending up on opposite direction!

To be fair to me I’ve never used a directional hdmi cable, it’s just these fibre hdmi cables that are.
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Makes sense. Are the cables capable of running 4k60? Interested as I've not seen any long active HDMI cables that aren't super expensive!
 
Dis86 said:
Is it pure FO? I thought there were still some standard cables in the mix?
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It seems that's for power (the standard cables). I'd have thought these cables would need some form of power (via USB or something) on either ends to power the active chip inside. It'd be interesting to see how they work without this as it seems to not have that.

If it's using power from the HDMI port, then the length would affect the power reaching the other end so not sure what those standard cables inside might be for.


Also for anyone else interested, I've seen there are cables that come in Micro HDMI form with the full size adapters. Those might be the ones you'd want if you're trying to run these cables through joists or small trunking. Very frustrating there's no custom solution without spending loads of money.
 
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Dis86 said:
Is it pure FO? I thought there were still some standard cables in the mix?
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Huh, looks like you can get both! TIL.

Can't find a proper specification for what the conductors actually do, one diagram said "HDMI bypass" which might refer to HDMI passthrough.

It would make sense if the copper conductors handle audio and perhaps some sync/handshake stuff. I think it might vary from cable to cable too.
 
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