[Elecraft] Astron VS-35M Powwer Supply V-

[Jim Brown]

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