Reg, this whole thread started because bizarre things happen with
Radial_3 with short radials.

You can go ahead and put a caveat in it if you like, but it's wrong at
short lengths and that fact needs to be made clear to users of the
program, before they install a radial system of 120 2m radials on 80m
and find that it's a terrible ground system.

The question that I want answered is how to optimize my radial system,
and I think at this point, I shall be consulting a document entitled
"Maximum Gain Radial Ground Systems for Vertical Antennas" by K3LC.

Anyone have other suggestions for sources of material for optimum
radial selection given a certain length of wire?

73,
Dan

Reg Edwards wrote:
Frank, I am not interested is what happens at very short lengths or
what Radial_3 makes of it.

To determine Zo, start around 10 metres.

If very little happens to input impedance between 10 and and 15 metres
then you already have Zo = Zin = Ro + jXo.

Neither am I interested in efficiency or antenna input impedance..
The problem of Efficiency has already been sorted out.

etc.