[TowerTalk] Double Coax Runs to Reduce Loss

[Jim Brown]

Hi Ed,

No, not twisted pair for chokes. But I have recommended parallel 
enameled wires and THHN (ordinary house wire) wound on #31 toroids 
connected as two-wire transmission line. You're correct that closely 
spaced enameled wire yields Zo about 50 ohms; closely spaced THHN yields 
Zo in the range of 85 ohms - 100 ohms. Jerry Sevick, W2FMI, noted this 
result in late editions of his book, and my measurements confirm that 
within measurement accuracy.

73, Jim K9YC

On Thu,12/22/2016 11:22 AM, Edward Mccann wrote:
> Re twisted pair, I seem to remember you suggesting at one time that using twisted pair enameled wire on FT-240 #31 mix provided about 50 ohms on the CMC Choke.