[Elecraft] K1 - KAT1 FD OCF dipole ... do I have to do the math? ; -)

[Steve Jackson]

OK, I wanted to build a plug-n-play off-center-fed
doublet for Field Day to match my K1 (40-30-20-17) /
KAT1 / solar powered portable station.  This aerial
would be much like the old Fritzel, with some
customization for my purposes.

I reasoned I could fiddle with the offset (and maybe
one dangling stub) to get the resonances I want, and
so agrees EZNEC, but when I do, all of the feedpoint
impedances look like they are around 260 to 350 ohms.

So I need a 6:1 balun to coaxially feed this antenna
(coax feed is necessary, long story).

Then, I went to the shop downstairs to draw it out and
wind one up ... no biggie, right? ... and I realized I
can easily wind up a 4:1 right off the top of my head,
but, how do I make a 6:1?  I guess I need two
back-to-back, or a funky duo-toroid, or something.  ??

Well, I "can" obviously figure this out myself, but
that would be reinventing the wheel.  Did a bit of
Googling, with no obvious results.  I don't have Jerry
Sevick's book here, alas.

What say ye, fellow Elecrafters?  Should I just use a
4:1 and eat the inefficiency?  (At battery QRP, I
don't like that option and besides, the purist in me
revolts against such technoblasphemy.)  Or could I
actually make a "custom" balun here, and kit my
solar-powered K1 with a snazzy, efficient and
"matching" antenna?


		
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