[Elecraft] K2 KAT100 and BL2 questions

[Bob Tellefsen]

Brian
What are your expectations for this antenna?

Used as a halfwave, say on 40m, its pattern will be that
of a regular dipole.  However, if you feed it at the end,
it becomes an endfed full wave on 20m.  It will not
have a nice major lobe at right angles to the wire, like
the dipole.  Instead, it will be a four-leafed clover type
of pattern.

If you want the pattern on the harmonic band to be at
right angles to the wire, then you need to center feed it
with the 450 ohm line.  That will give you what is called
two half waves in phase, with a nice major lobe at right
angles to the wire and about 2 dB gain over a simple
dipole.

Good luck and 73
Bob N6WG
The Little Station with Attitude

----- Original Message ----- 
From: "Brian Lloyd" <brian-wb6rqn at lloyd.com>
To: <elecraft at mailman.qth.net>
Sent: Monday, June 02, 2008 10:54 AM
Subject: [Elecraft] K2 KAT100 and BL2 questions


> Does anyone know if the KAT100 has enough range to match a radiator
> that is close to (or is) an end-fed 1/2 wave? What I am thinking
about
> is feeding a dipole at twice its resonant frequency so that it is
> effectively two end-fed  1/2 wave sections and then feeding with
> ladder line. Now the ladder line will probably act as a transformer
to
> change the matching equation. (I know it won't change the SWR but
the
> magnitude of the resistance and reactance components will change.)
>
> This also brings up a question I asked much earlier but didn't get a
> good answer to. Will the Elecraft BL2 4:1 balun intended for 300/75
> ohm operation still work properly when feeding the equivalent of two
> end-fed half-wave antennas? If I recall these would represent about
an
> 8000 ohm impedance. I was thinking of locating the balun very near
the
> tuner and using window line to the doublet. I am concerned about
> losses and arcing (100W) in the balun in that specific instance.
>
> --
>
> 73 de Brian, WB6RQN
> Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
>
>
>
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