I finally got around to constructing my first coaxial
collinear as per:
http://www.repeater-builder.com/antenna/wa6svt.html
(and using a few of Kevin's ideas)
I have a question for those who have built these. Referring
to step 9 and figure 4, I assume the decoupling sleeve
connects a *true* (free space) quarter wave down from where
the feedline connects to the first half wave element?
Something I've discovered which may be of use to other
antenna builders... I had trouble finding coax guts that
would fit inside the K&S 5/16" tubing. Most of it was just
a little too tight to be forced into the tubing. Then I
discovered if you chill the coax guts in the freezer for
about 30 minutes it shrinks enough to slip in! It's still
snug but it'll go in. It then becomes *very* tight after it
warms up, and probably cannot be easily removed. Using this
technique, Belden 8237 and 8267 is usable for solid
dielectric designs, 8214 for foam. Actually most 8214 can
be forced through without being chilled. I found one NOS
piece of 8267 that fits without being chilled, but the new
stuff doesn't (at least not the two pieces I ordered from
different suppliers as a test -- your results may vary,
considering construction tolerances for both the coax and
the brass tubing may cause unpredictable variations).
Paul N1BUG
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