Suggestions for 100ft composite video cable - AVS Forum
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post #1 of 8 Old 03-03-2012, 12:24 PM - Thread Starter
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Have to run a 100ft video cable with no audio (the single yellow composite variety) to connect my security camera DVR to a TV in the home theater. I'm sure there is variations in quality on the market so picking up a 100ft radio shack cheapo is not an option.

I need to make sure the quality is enough so there is no signal degradation, picture waving (not sure how to describe it but the picture seems to have dark wavy lines moving across the picture). I have a 100ft cable already in place (the cheapo Radio Shack variety) that is a test cable. Not good. I'd like the image quality like you can get from a standard 6ft cable.

If I am off base here and there really isn't any variations in cable quality I'm all ears. Trying to get educated on this form of cabling as it has been soooooooooo long since I have worked with composite cabling.

Thanks so much for any help in advance!

Cheers,
Ray Johnson
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post #2 of 8 Old 03-03-2012, 12:58 PM
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post #3 of 8 Old 03-03-2012, 01:01 PM - Thread Starter
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Perfect, thanks!

I totally forgot I had extra cat5 run to/from the locations I need. I even have baluns ready to go.

I ran more than I would need in case I needed in the future......looks like the future is now

Appreciate the input. Have a great weekend!

Cheers,
Ray Johnson
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post #4 of 8 Old 03-04-2012, 08:02 AM
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You said you wanted a quality signal. You'll get that from any decent 75 Ohm coax cable.
Using cheap transformers to convert the unbalanced video signal to balanced, and then back again, will degrade the quality noticeably.
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post #5 of 8 Old 03-04-2012, 10:26 AM
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Quote:


I need to make sure the quality is enough so there is no signal degradation, picture waving (not sure how to describe it but the picture seems to have dark wavy lines moving across the picture).

Do the dark wavy lines move side to side or bottom to top? Bottom to top generally means a 'Hum Bar' and the transformer solution will take care of it. As to them degrading the quality noticeably if that were the case, why would they use them in Casinos with hundreds of cameras (and the need to spot the tiniest details)?
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post #6 of 8 Old 03-04-2012, 10:59 AM
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Quote:
Originally Posted by SAM64 View Post

You said you wanted a quality signal. You'll get that from any decent 75 Ohm coax cable.
Using cheap transformers to convert the unbalanced video signal to balanced, and then back again, will degrade the quality noticeably.

True but he is talking about a security camera here. And the balanced operation does help on long runs to kill hum. The problem I have seen is the attentuation of low frequencies. Classic LF tilt problems (shading in large black areas).

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post #7 of 8 Old 03-04-2012, 02:44 PM
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For a 100 foot video feed from your DVR to your TV, run a standard 75ohm RG-59 cable. Terminate as needed (BNC or RCA).
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post #8 of 8 Old 03-04-2012, 03:35 PM
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A 100' foot analog video cable is not going to give the same picture as a 6' cable.

Best bet is a good coax cable designed for video. That means solid copper center conductor, 95% copper wire braid plus foil shield, like Belden 1694A. Manufacturers can control the geometry, and thus the impedance of coax better than twisted pair. The tighter the control of the impedance, the fewer reflections that will affect the picture (ghosts). And Belden has a better record of controlling impedance than most manufacturers.

If tilt is a problem, there are tilt compensators.

If hum bars are a problem, there are ground breakers.
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