On Tue, 20 Nov 2007 21:38:55 -0800, Roy Lewallen
wrote:

If that's too tough, how about just a dipole a quarter wavelength above
ground?

Hi Roy,

Hmmm, too tough.

The math is all pretty ordinary and well within your capacity to
examine in your own copy of the book. So I won't belabor others with
that. However, as others do not have a copy, they might appreciate
some other benchmarks:

End Fed Half-Wave 600 Ohms
which, of course, suffers the same question;

Folded Quarter-Wave Dipole 260 Ohms
there, a resistor might comfortable be applied, but I don't know as I
have not tried it; yet and all, this is drawn from the same ordinary
math;

Folded Half-Wave Dipole 500 Ohms
same observation as with the Quarter-Wave and falling nearly on twice
the rating too - a coincidence of the math no doubt; (But I believe
there is a commercial variant of this that is popular with the MARS
group exactly for the reasons of not presenting SWR.)

Continuous Wire Array 300 Ohms
an oddity in the pantheon of styles, yet it too seems suitable to
resistive termination for testing "Surge Impedance;"

Rhombic Antenna 600 Ohms
here's one that is more familiar to all, and with the added bonus that
it is typically loaded with a resistor to exactly fulfill the
definition of "Surge Impedance" whose ordinary math dovetails with
experience.

But, Roy, I do recognize the terms "Surge Impedance" maybe a language
barrier with you as it certainly qualifies as an archaic term. Reggie
loved to carry this water and in spite of differences, his treatments
quite often got him results that were good first approximations, and
sometimes better.

If you really seek closure, I would suggest you could mine your own
copy of this reference for errors. As for its practical importance -
well, let's just say that this board would support only 2% of the
current traffic if it came to that.

73's
Richard Clark, KB7QHC