bought a VGA-to-BNC RGB cable -> how do I know it's 75 ohm?

kendjet · Post by **kendjet** » Thu Jan 12, 2017 11:32 am

Hi all,

Got a noob hardware question... I Bought some VGA-to-BNC RGB cables, but I don't know if the cables and/or the connectors are 50 or 75 ohm.

Checking out http://www.epanorama.net/circuits/vga2rgbs.html, it seems everything *should* be 75 ohm (which seems to be what I need)

What are the odds of this cable or the BNC connectors being 50 ohm? I.e. is there any chance I bought a bad cable? Can I accidentally damage an Extron or a PVM/BVM this way? I guess I would need a multimeter to check the resistance?

Thanks!

Fudoh · Post by **Fudoh** » Thu Jan 12, 2017 1:06 pm

50 ohm is used for audio cables. All VGA cables should be 75 ohm. You won't break anything by using the wrong ones. For short runs it hardly matters.

kendjet · Post by **kendjet** » Thu Jan 12, 2017 2:11 pm

Great, thanks a lot!

Fusion916 · Post by **Fusion916** » Thu Jan 12, 2017 11:28 pm

It's 75 ohm characteristic impedance. You need a LCR meter to measure it.

kendjet · Post by **kendjet** » Sun Jan 15, 2017 2:22 am

Thanks for the info!

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bought a VGA-to-BNC RGB cable -> how do I know it's 75 ohm?

bought a VGA-to-BNC RGB cable -> how do I know it's 75 ohm?

Re: bought a VGA-to-BNC RGB cable -> how do I know it's 75 o

Re: bought a VGA-to-BNC RGB cable -> how do I know it's 75 o

Re: bought a VGA-to-BNC RGB cable -> how do I know it's 75 o

Re: bought a VGA-to-BNC RGB cable -> how do I know it's 75 o