On 4/12/2018 10:07 AM, Walter Underwood wrote:
Cat 5 cable has a different twist on each set of pairs. Those range from 52 to 72 turns per meter or 1.94 to 1.38 cm per turn. That works out to 15 to 22 turns per foot.
Yes. This is done to minimize inductively coupled crosstalk between pairs, which is critical to Ethernet transmission. A pair from CAT5/6 cable used to carry audio or RF provides very good rejection of differential mode coupling to/from the cable. It's a great choice for telephone wiring if RFI to the phone line (including DSL) is a problem. A CAT5/6 pair is also a great choice for adding a ferrite common mode choke to a low band receive antenna. I've completed a set of measurements on this and will publish an applications note in the near future.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
