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In Reply to: Ultimate S-Video Cable posted by Steve W on July 05, 2001 at 18:48:01:
Interesting. From what I can tell from your post, you used one coax pair for the cable. You should try doubling up and using two pairs (one for the signal, one for the return). I do this, and it should outperform a single pair, which uses the shield as return, noticeably.Good luck,
daryl
Follow Ups:
> You should try doubling up and using two pairs (one for the signal, one for the returnWould you use a cross-connected configuration as with the Risch 89259 speaker cable recipe or leave the shields unconnected? (Forgive me, but I'm a cable idiot. I wouldn't know the advantages of one configuration over another.)
I'll be building an 89259-based S-Video cable to connect a new SVHS player to my TV. It'll be a challenge soldering the cables to the S-Video connectors.
BTW, why are those connectors so small? I suppose the standards people wanted to keep costs down?
Agree, they took me 2 hours to do! they should design some with crimp pins like the Canare RCAs!
That'll make work much easier!
When you use a two pair configuration the shields no longer carry the return. Thus I'd connect the shields to the DIN connector at one end only, and leave them floating at the other end, making sure they don't touch each other to form loops. This will let them do what they do best, which is shield the inner connector, instead of carrying the signal in addition.As for why they use connectors only the children of gnomes can comfortably solder, well, your guess is as good as mine (which has to do with the use of gnome-child labor....)
--daryl
I just finished building the four coax cable combination and it did not work for me. I used four runs of Belden 1505a using only the center conductors for the pins and the shields were connected to the barrel of the source only. I got some kind of fine interference pattern on my picture - kinda like diagonal crosshatching. Not sure if its rf or the fact that the combination is not true 75 ohm. I rebuilt it with only two runs of 1505a and everything was fine again. Compared with 1406b, I could tell no discernable difference, even though 1505a is a larger RG59. My run was 18 feet.
Hmmm, that's a strange result. The only thing I can think of offhand is perhaps try connecting the shield at both ends. Sorry it didn't work for you. I'm using double runs of Belden coax pair (can't recall the parts number offhand; they are paralleled 75ohm minicoax), six feet in length, and this configuration works extremely well for me.--daryl
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