Quality video cable questions

[wyvrn]

I went shopping for about 20' worth of video cable (composite, not S-video) yesterday, and to my suprise neither Best Buy nor Fry's carried anything longer than 6'. To get longer, you have to buy the 3-wire audio/video cables, which I don't need, and even then I could only get 12 ft. I asked the sales guy (who probably has little actual knowledge of cable standards) if more than 12' would cause signal loss in a composite cable, but he said he didn't think so. So, I substituted two 10' GE-brand double-shielded, gold plated, oxygen-free audio cables and used a gold plated coupler to get my 20'. My questions are, does composite video suffer loss at lengths > 12' and will the high quality audio cable I purchased be good enough? BTW, I am putting this in my car and am trying to avoid noise and interference. I thought about using coaxial cable with adapters on either end, but am not sure if video cable is 75 ohm like tv coax, or something else and therefore would suffer signal loss.

 

[Linux23]

video cable has the same ohm rating as any audio cable. both are 75 ohms, so that coax should work just fine.

 

[wyvrn]

So your standard rca audio and video cables are also 75ohm? Interesting, because I think quality coax is much cheaper by the foot.

Originally posted by: Linux23
video cable has the same ohm rating as any audio cable. both are 75 ohms, so that coax should work just fine.

 

[Linux23]

Originally posted by: wyvrn
So your standard rca audio and video cables are also 75ohm? Interesting, because I think quality coax is much cheaper by the foot.

Originally posted by: Linux23
video cable has the same ohm rating as any audio cable. both are 75 ohms, so that coax should work just fine.

yes it is. i made a couple of RCA typel cables for hooking my DVD player's A/V out to another room in my house, and it worked fine.

 

[wyvrn]

Good to know, thanks. Next time I'll buy a box of coax and make my own cables

Originally posted by: Linux23

Originally posted by: wyvrn
So your standard rca audio and video cables are also 75ohm? Interesting, because I think quality coax is much cheaper by the foot.

Originally posted by: Linux23
video cable has the same ohm rating as any audio cable. both are 75 ohms, so that coax should work just fine.

yes it is. i made a couple of RCA typel cables for hooking my DVD player's A/V out to another room in my house, and it worked fine.