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Author Topic: Audio snake for video  (Read 545 times)

David Allred

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Audio snake for video
« on: May 05, 2017, 11:46:17 am »

I know from experience that video (standard yellow RCA) from a projector or media player loses color or picture altogether when making long runs (100' -150' in my case).  Can anything be done to allow snakes or mic cable to be used for this purpose when BNC / coax are not available?

Would a 50 or 75 ohm resistor at one end or the other (or some combination at each end) do anything?
Are boosters made for this purpose?
What (how) do coax boosters do (it) any way?
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TJ (Tom) Cornish

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Re: Audio snake for video
« Reply #1 on: May 05, 2017, 11:58:20 am »

I know from experience that video (standard yellow RCA) from a projector or media player loses color or picture altogether when making long runs (100' -150' in my case).  Can anything be done to allow snakes or mic cable to be used for this purpose when BNC / coax are not available?

Would a 50 or 75 ohm resistor at one end or the other (or some combination at each end) do anything?
Are boosters made for this purpose?
What (how) do coax boosters do (it) any way?
I haven't run composite video to a projector in 10+ years - everything is HDMI/SDI.   I would carry a piece of Cat5/6 cable with appropriate HDMI adapters.  Inexpensive and the right tool for the job.
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Erik Jerde

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Re: Audio snake for video
« Reply #2 on: May 05, 2017, 02:02:00 pm »

Your solution should be to ditch composite and (S-Video) altogether.  SDI or HD-BaseT are where you should be looking now.  You can put component over SDI very easily if you're lost king for an analog solution.
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Steve Alves

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Re: Audio snake for video
« Reply #3 on: May 05, 2017, 02:24:52 pm »

I was trying the same thing.. Easier and better quality to stream h.264
Do a Google search for Matrox Maavex kit (encoder/decoder)
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Steven Alves
South Florida Sound, Fort Lauderdale, FL
www.southfloridasound.com

John Rutirasiri

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Re: Audio snake for video
« Reply #4 on: May 05, 2017, 07:46:56 pm »

Can anything be done to allow snakes or mic cable to be used for this purpose when BNC / coax are not available?

No.  Audio snakes and mic cables cannot really support video bandwidth, and they do not have controlled impedance. 

Would a 50 or 75 ohm resistor at one end or the other (or some combination at each end) do anything?

Nope.  I can see your logic in trying to get the cable's characteristic impedance to 75 Ohms to avoid reflections, but issue is really bandwidth.

Are boosters made for this purpose?
What (how) do coax boosters do (it) any way?

"Boosters" (distribution amplifiers) work very well for HDMI and SDI/HDSDI/3GSDI signals because they reclock and regenerate the signal.  Not so with analog video.  If it's crap coming in, it i will be crap going out.

John R.
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ClearImpact Sound & Event Services, Inc.
Sound/Lighting/Corporate A/V

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David Allred

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Re: Audio snake for video
« Reply #5 on: May 07, 2017, 09:12:31 am »

Thanks, John.  Very clear.
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