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In Reply to: Re: Shield/conductor interaction & dialectric choices questions posted by Cousin_Dupree on January 07, 2002 at 11:08:41:
You can order it from US Plastics they are a little cheaper then the hacked up cores from coax, and its no work :-)dee
;-D
Follow Ups:
Thanks Penguin,
That's very helpful. In the case of the 89259/89248 would I be better off skipping the 4 gauge tube all together? If so it'll save me $1.48/pair ft of expense. The only thing it contributes is a little greater space between the shield and the conductors, but I wonder if the conductors being somewhat loose inside it doesn't more than offset whatever gains would be realized by the additional spacing? It sounds to me like the twisted pair might not even fit through there anyway.
John's recipe is pretty clear about the importance of spacing the shield away from the conductors and letting it fold into the creases of the twist. I found the 1/8" od teflon tube fit extremely well and the quad twist holds together very nicely. I have not tried to force the thing inside of a tube but i would suspect it is rather difficult. You can still make the twist under $5 a foot so a three foot pair cost less than $80 with decent locking connectors, $150 if you use the WBT crimps. I think it is not a bad deal.
dee
;-D
Penguin,
I was assuming, maybe not the smartest thing, that with the two conductors + the two additional small guage tubes that the shield wouldn't be able to get into the creases. I'm really not on a total budget kick, but if the twisted pair/additional small guage tubing combo won't even fit through the 1/4" tube then what would the point be to begin with?I like to plan this stuff out ahead of time as much as possible, but sometimes you [read me] just have to go forward and see how it all turns out. I'll probably order enough 1/4" Teflon to do the two pairs regardless. If it fits, I use it for this project. If it doesn't, maybe I'll use it for some other project in the future.
Absolutely we want to minimize the interaction of the shield/conductors. I'm just trying to figure out the best way to do it, & a way that can be accomplished w/o too much trouble.
Cousin... Are we related ? :-)The idea is that you use the 1/8" in a star quad twist configuration to space out the shield. Is saves you from cramming the thing into a tube. The two cores and the tubes line up something like this on the cross section
oO
ooYou get the picture. The whole thing slips into the shield. It is a lot easier than trying to thread the twisted cores into the tube.
dee
;-D
Re: Got it! Thanks.
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