[Elecraft] Coiled Coax Choke

[Dauer, Edward]

I am thinking of adding a coiled coax common-mode choke to my system.
Presently it goes K3-KPA500-KAT500 then 100 ft coax to the base of an
inverted Vee¹s center support pole (collapsible fiberglass), then 30 feet
up the pole to a 1:1 balun feeding a fanned 10-15-20 Vee.  The idea, for a
couple of reasons, is to put the choke at the base of the pole, something
I haven¹t seen discussed in the literature.  Two questions I am wondering
about:  1. The choke would be 100 feet from the tuner and about 25 feet
from the antenna/balun.  Probably not as good as having it right at the
Vee, but is that compromise worth while?  2.  For appearance sake I am
thinking about winding the coax around the base of the support pole.  It
is 2 inches in diameter but I could slip a 3 inch PVC over that section to
increase the diameter.  Anyone know an algorithm for determining the
number of turns in the winding if I do that?  I would be much obliged for
any thoughts and suggestions . . .   Tnx!

Ted, KN1CBR