Pairing conductors eliminates capacitance problem. C
> On Nov 6, 2015, at 2:01 PM, Jan Kandziora <j...@gmx.de> wrote: > >> Am 06.11.2015 um 22:11 schrieb Peter Hollenbeck: >> Ocean temperature at depth of about 5 feet. > In that case your concerns should be: > > * No flame retardants in the cable sheath. Because these are hygroscopic > so seawater will make the sheath crumble. > * UV resistance. Ground cable obviously has zero UV resistance. It's > built to resist pressure from gravel, ground movements and mice. > * No air inside the cable. Because if you have air inside the cable, > there's room for water in it, too, which makes your whole cable foul > away if you have a single spot which is not water-tight. > > > > I'm concerned how many people think Cat5e is the most suitable cable for > onewire. It isn't. Onewire will work with any cable, the limitation is > cable capacitance, which is especially bad with twisted-pair, as Cat5e > offers. You gain no benefit from TP because onewire has asymetric drive. > Plus, the shield is ineffective when not properly *earthed* (not > grounded!), as it seldom is. In that case, the shield acts as an antenna > which picks up additional noise. > > For onewire, unshielded telephone wire on a pole is better than Cat5e. > > > My suggestion is to use a 3x1.5mm² silicone cable intended for mains > voltage, as silicone doesn't need flame retardants, it is UV resistant > and hasn't got air inside the cable, as Cat5e has. If you need more > mechanical stability, try black PE sheated cable but take care for the > flame retardants and air. > > Kind regards > > Jan > > ------------------------------------------------------------------------------ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
