[Elecraft] Antenna question

[Robert Tellefsen]

Hello Tom
I'm using a similar setup here for my K2.
The dipole is just 60 ft long, a bit under
a true half wavelength.  However, with the
450 ohm tuned feeders, I use the antenna on
80, 40, 30 and 20 meters.  Works very well
at a height of 42 ft in center and 35 feet
at ends.

Two things will make matching easier.  Get two
baluns, 1:1 and 4:1.  Put them on the two
antenna ports of the ATU.  Now, when you change
bands, put the feeder on the balun that gives you
the lowest swr while the ATU is in CAL S.  This
is effectively bypassing the ATU.  Then switch
in the ATU and match.  From then on, the ATU
memory will remember the settings, so you will
just have to remember which balun goes with which
band or bands.  Works very well.

Good luck and 73
Bob N6WG

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Tom McCulloch
Sent: Saturday, August 20, 2005 6:58 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Antenna question


Hi all,
  I'm considering putting up a 40 meter dipole fed with a 450 ladder line.
I have a K2 which I run at about 5 to watts (I do not have the 100 watt
amp).  The K2 also has the internal ATU.

  I have always used 50 ohm coax up until now.  Is there anything I should
know about using the K2 with 450 ohm feedline?  (Will I need a balun, or can
I just feed the ladderline directly to the K2's ATU and that will take care
of the match.

Thanks for your help.

Tom, WB2QDG

K2 1103

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