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Old April 18th, 2004, 09:09 PM   #1
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Is there an S-Video to BNC adapter?

I'm looking to purchase a broadcast monitor, but I've noticed some have only BNC video jacks, and I only have S-Video and RCA jacks on my RT.X100 breakout box.

I have looked on the internet for adapters; so far I have seen RCA to BNC but no S-Video to BNC. I would prefer to go from S-Video to BNC due to the superior picture quality. Does anyone know where I can find such an adapter?

*Edit* Actually, I did see some, but not what I needed - a female S-Video to male BNC. Nobody I saw had them.
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Old April 18th, 2004, 10:39 PM   #2
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I know you can buy s vid to RCA but why bother? My field monitor has BNC and S video. Go S Video all the way. You won't get the same rez using BNC
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Old April 19th, 2004, 11:22 AM   #3
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Hi Christopher,

My monitor also has only BNC inputs, and after much searching, I found that there doesn't appear to be any such thing as an S-Video to BNC adapter. However, you can buy a BNC to RCA adapter, which should work fine for your purposes. I ended up buying a BNC to RCA adapter, and an RCA to S-Video adapter, which when put together makes a BNC to S-Video adapter. All of these parts can be bought at Radio Shack.

Good luck,
Ryan
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Old April 19th, 2004, 11:25 AM   #4
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Is BNC really lower resolution than S-Video? I was under the impression that BNC was better; else why would these monitors only have BNC connections?
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Old April 19th, 2004, 11:34 AM   #5
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Ryan,

Thanks, at least I know I'm not crazy now. I wonder why nobody makes one? I sure would have thought somebody did.
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Old April 19th, 2004, 11:37 AM   #6
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Hi Chris,

Your confusing BNC as a video signal, which it is not (its a type of connector).

BNC is a way of transfering a video signal whether it be composite, component or SDI. Its a more robust type of connector thats why broadcasers like to use it.

S-video is a signal as well as a connector. All though it's technical term as a connector is Mini-DIN. but it is also refered to as s-video as it's the only type of signal that will take that type of connector.

You then have phono connectors which carry the same signals as what a BNC connector can carry. These are mainly used on consumer level goods, where the connection does not need to be as robust.

Does that make sense?

Hope it helps,

Ed
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Old April 19th, 2004, 11:57 AM   #7
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Yes, that makes sense. But I still wonder why no one appears to make the type of adapter that I, and I am sure others, need.
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Old April 19th, 2004, 12:40 PM   #8
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Christopher,

Going from s-video to your BNC connection which I presume is composite (on the monitor) will decrease picture quality, you're going from a separate Y/C signal down into a mixed signal. Therefore monitoring this way will not give you the best colour reproduction, and not the ideal situation for a post production setup.

The only point that I would see its use, is if for some reason you can't use the composite connection from the RTX 100. i.e you need to see the footage on 2 source monitors, 1 from the s-video, the 2nd from the composite.

If you wish to use the s-video then you'll need to find a broadcast monitor that has s-video on it, that way you'll get the correct colour reproduction.

Hope this helps,

Ed
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Old April 19th, 2004, 04:56 PM   #9
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Ah, I see. So if I was stubborn enough to get a broadcast monitor with only BNC connections it would be better to go from the composite connections to the BNC rather than from S-Video to BNC?

(I have no idea if the BNC connection on the monitor is composite. The one I was looking at is a Panasonic BT-S1900.)
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Old April 19th, 2004, 08:24 PM   #10
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S-video to BNC

Here is a solution. I use these and they work great. It will cost you around 100.00 through B & H but you'll get what you want. This gives you Y/C (S-video) in and 2 Y/C out - 2 BNC out.


http://www.kramerelectronics.com/indexes/pic.asp?p=401C
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Old April 20th, 2004, 10:38 AM   #11
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Thanks for the info, James. It's nice to know something does exist should I need it. Since I will be doing color correction, thought, and it sounds like the S-Video would provide superior image quality I may just get a monitor with S-Video inputs.
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Old April 20th, 2004, 11:15 AM   #12
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Chris,

svideo and composite cannot simply be converted one to the other by patching wires alone. This is because svideo uses at minimum 3 conductors, while composite is carried on 2 conductors (ignoring any details of shielding...). Conversion requires electronics.

If you use the RCA output on the RTX.100 you will have a lower quality output than if you use the svideo output.

If I were you I would check to make sure that the monitor had svideo in. If it doesn't then make sure the BNC you see is composite, and not one of a set of component inputs.

Regards,

Julian
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Old April 20th, 2004, 11:54 AM   #13
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Julian,

What was I thinking? Of course, component would use several connections. (Where was my head when I needed it?)

I am aware that S-Video is superior to RCA, but I was just trying to figure out if I did convert to BNC which (S-Video or RCA) would be better to start out with. I thought at first it would be S-Video (which is why I asked about the S-Video to BNC adapter), but the subsequent discussions here have cast doubt on that assumption.

Thank you all for your help. I have decided I will look for a broadcast monitor with S-Video connections. Better to try to skip the whole conversion/adapter mess if one can.
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