[Elecraft] E-H Antenna Simulation in NEC

[Tony Wells]

Hi John,

I agree with you completely on the subject of portable dipoles in the field.

However I, and many others are in the area of trying to find a small compact
ant that will work well in small backyards. Most ham real estate will allow
20-30 feet elevation up a pole but only limited radiator and feedline
length. So the EH antenna up a pole *may* provide a better solution  on 40,
80 and 160 Mters. The nearest alternative to the EH in these circumstances
is the mag loop, and that itself would be a compromise on 40, 80 and 160. If
there was a "conventional", "good" solution to this already, there would be
one in evey small backyard.

Regards,

Tony
M3CJF
G7IGG

All mail in and out checked lovingly by hand, character by character.

----- Original Message -----
From: "John, KI6WX" <ki6wx@pacbell.net>
To: "Tony Wells" <t.wells@blueyonder.co.uk>; "Elecraft Mailing List"
<elecraft@mailman.qth.net>
Sent: Friday, February 28, 2003 8:35 AM
Subject: Re: [Elecraft] E-H Antenna Simulation in NEC


> 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
> >
>
>
>