Greetings:
The limited tuning range of the KXAT1 antenna tuner originally bothered
me some. Since I started working with it, and I am still having a few
problems with the unit but that is another story, I have experimented
with a simple technique to deal with very short or wires approaching 1/2
wave long. I am not keen to measure the length of wires that I toss
into a tree, so I have taken to carrying a small coil with me that I
just put in series with the random wire if the ATU is unable to achieve
a reasonable SWR. The action is to simply move the effective length of
the wire along a ways, thus avoiding the 1/2 wave length of wire. This
could also be done with a small capacitor, but I have not yet taken one
of these in my pocket when I go for a walk to the back of my island home.
The coil I use is about 30 turns on a 1r5 inch form, spaced one wire
diameter. I have never worked out the inductance, it was left over from
a receiver experiment some years ago.
Larry
VA3LK
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