There is also such a thing as shielded twisted pair ribbon cable :) A few years ago someone was selling it on eBay in by the foot. I bought two 10 foot sections just because I knew that such cable was rare and super expensive if you had to find it new. This cable has 21 twisted pairs all inside one shield with a flat plastic outer jacket. On Mon, Jan 1, 2018 at 10:22 PM, Lee piclist wrote: > On Mon Jan 1 18:10:53 2018, Isaac M. Bavaresco wrote: > > > > Splitting the cable and separating the wires will increase the > > impedance of the one wire that is not together with the ground wire. > > There was (maybe still is) a commercial solution -- ribbon cable > with a 1 to 2 inch long flat section every 18 inches (maybe 12 in, > it's been a long time) for IDC connectors. Between flats, each > pair was seperate & twisted as interfaces using ribbon cables > usually alternated signal wires with ground wires. Twisted pair > ribbon cable was much more expensive & was highly constrained in > how close you could adjacent IDC connectors. > > > > It would be good if each signal wire had its own ground return wire. > > I've made my own ICD to PIC target cables using unshielded twisted > pair (UTP) wire. Each of PGC and PGD signal wires have a ground > wire twisted around it; ground is only connected at one end. Keep > cable as short as possible. I haven't had crosstalk problems. > > Lee Jones > > > Em 01/01/2018 21:12, Allen Mulvey escreveu: > > > >> Back in the olden days... > >> We had flat cables on hard drives, floppies, and a number of other > >> devices. Sometimes we would take a knife and split the flat cable > >> between the suspect pairs. This would often solve problems like > >> this. It doesn't cost anything to give it a try. > >> > >> Allen > >> > >> -----Original Message----- > >> > >> The standard Microchip cable unfortunately puts PGD and PGC on > >> adjacent lines. Since this is a flat cable, this can and does > >> lead to crosstalk between the two in some cases. > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .