[Elecraft] KX2

[Guy Olinger K2AV]

On Fri, Jul 15, 2016 at 12:24 PM, Fred C. Jensen <k6dgw at foothill.net> wrote:
> (End Fed On 80 But Works Great On Other Bands Too). :-)

One of the endearing qualities of an 80 meter end-fed half-wave L is
that it is usually a very good antenna for both 7 and 10 MHz. If the
bend of the L is somewhere close to the middle of the wire, as in up
55 out 75, up 70 out 60, we get some interesting if counter-intuitive
effects.

On 40 the wire acts like a 40 dipole hung in the same air space. Due
to the interaction of the vertical and horizontal parts of the L, the
vertical wire becomes a single wire feedline. Very easy to model. Try
it and get used to the idea that to the naked brain that doesn't make
any sense.

On 30m the pattern is a low-ish angle omnidirectional.

Since it is a high Z feedpoint on all three bands, one half-wave on
80, two on 40 and three on 30, the use of pathetic ground is permitted
at the feedpoint. If you add the switching and an FCP, this becomes a
very efficient antenna for 160-80-40-30. Use of the pathetic ground on
160, since that is a *current* feed rather than a voltage feed will
produce a pathetic 160 radiated signal.

73, Guy K2AV