I don't have exactly the same setup, Jim, but I can describe what has worked
for me.
I use a 44 ft doublet fed with open wire line (homebrew) for 40 thru 10. I
bring the feedline down to my shack window and connect it to one of the
Elecraft switchable 4:1 and 1:1 baluns and then run a short (5 foot) piece
of RG-8X to the tuner/rig. Have also on occasion used an 88 ft doublet when
I wanted to operate 80. My feedline is much shorter than yours (30 feet or
so). Haven't bothered to go through the modeling and transmission line
length transformation type stuff, but with the Elecraft K2 tuner and the
switchable balun I can find a match on all bands. Some bands definitely
prefer one balun ratio over the other. The impedance seen at your shack
will vary over a WIDE range as a function of feedline length and operating
frequency. If you run into a situation that won't match, adding in a 5 ft
or so section of open wire line will no doubt fix things up.
73
... Craig AC0DS
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