[Elecraft] E-H Antenna Simulation in NEC

[John, KI6WX]

Tony;
My personal suggestion for a good portable antenna is to make a random
length dipole (you don't even have to feed it in the middle) that is as long
and high as feasible for your operation.  Feed it with a piece of coax, but
don't worry about a balun.  Let a KAT1 or a KAT2 match the load at the other
end of the coax.  The feedline will radiate, but you don't care because the
antenna is non-directional.  This will work as well as any non-beam type
antenna, it is cheap to make, doesn't weigh a lot, and is easy to put up.
It will even radiate both horizontal and vertical polarization because of
the feedline radiation.

On one Field Day I used this type of antenna from the summit of Mt. Shasta
in northern California running 2 watts from an HW-7.  We worked numerous
Japanese and east coast stations without difficulty.  The effective height
of that antenna was about 2 miles above the surrounding country.

-John
 KI6WX



> John wrote:
>
> > I would expect that most of the radiation
> > will occur from the transmission line if it is longer than a few feet.
If
> > it is longer than a 1/4 wavelength, the overall efficiency of the
antenna
> > and transmission line could be pretty good even though the antenna is
> > radiating less than 1% of the power.
>
> Hi John,
>
> Coax, shmoax. Feedline shmeedline.  This is all getting a bit circular :-)
> These are all the reasons why Charles posted his question about wanting a
> small single transistor to connect to his EH antenna without any feedline.
>
> He and I are of the same mind on this. I've got a K1 I want to connect up
> but no EH antenna..He has, I think got an antenna but no small tx. Neither
> of us want to use feedline.
>
> Perhaps we should meet somewhere in the middle and hook up my K1. Should
be
> a square in the middle of the atlantic that is rare enough to attract some
> interest. I wonder if my K1 floats?
>
> Regards,
>
> Tony
> M3CJF
> G7IGG
>