[Elecraft] 270 foot (ish) Doublet & K3 ATU

[Wes (N7WS)]

I said earlier:

"Rick claims that when using a series connection of two different transmission lines, one coaxial, one window line, changing the length of one (coax) affects something or the other, while changing the length of the other portion (window line) has no effect whatsoever.

This is clearly impossible. "

I stand by those remarks.  Your empirical evidence to the contrary is wrong.

Rick also said:

"Changing from 10' of coax from rig to the CMC (common mode choke, typically incorrectly called a current balun, used at the shack window) to ~35' has a significant change in tuning and band use ability.  It allows me to operate above 300W on the bottom end of 80 meters when 10' makes it dicey (tuner matches, but can't handle/maintain the match above 300 watts)."

Yet earlier in the thread he said:

"The coax portion of the feed should be as SHORT as possible, in my case it is currently about 10' (2.8 meters).  The losses are highest there and the extreme SWR makes it MUCH worse, keep it short; use the best stuff, not the cheap stuff.  Changing the length of the coax portion has a HUGE impact on where (or if) the system tunes; the window line, none."

So which is it, 10' or 35'?

With that, I'm done.

Wes  N7WS