[Elecraft] Bal[un] (was: Buddipole vs. tuner and wire)

[Robert Tellefsen]

Hi Brian
I don't recall if you mentioned what power level you
would be using with your K2.  If it is running barefoot,
without the 100w PA, you could use one of the Elecraft
switchable baluns.  They switch between 1:1 and 4:1
ratios, giving you a good chance to match most balanced
feeds.

Even though the rig end of the line may be reactive, due
to impedance mismatches along the line, the switchable
balun can be used to reduce the amount of mismatch the
ATU then has to to cope with.

This makes a simple dipole with tuned feeders a nice
multiband antenna.  On a given band, try both switch
positions and see which one helps the ATU make the best
match.

Good luck and 73
Bob N6WG

----- Original Message ----- 
From: "Brian Lloyd" <brian-wb6rqn at lloyd.com>
To: "elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Tuesday, May 13, 2008 8:37 AM
Subject: [Elecraft] Bal[un] (was: Buddipole vs. tuner and wire)


> OK, I am convinced - keep the tuner and the wire. So, that brings up
a
> second question: balanced vs. unbalanced.
>
> Wire antennas that do not require a counterpoise are usually loops
or
> dipoles, i.e. inherently balanced even if not resonant. Most tuners
> offer an unbalanced output. SGC says, just connect up the antenna.
> Seems to me that a balun would improve things and keep RF off the
coax
> and power leads to the tuner. But how well do baluns handle huge
> mismatch?
>
> Just off the top of my head, it seems to me that the tuner at the
top
> of a pole with two legs sloped down, i.e. inverted-V, would make a
> pretty good omni all-band antenna.
>
> More thinking aloud.
>
> Brian Lloyd
> Granite Bay Montessori School          9330 Sierra College Bl
> brian AT gbmontessori DOT com          Roseville, CA 95661
> +1.916.367.2131 (voice)                +1.791.912.8170 (fax)
>
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