Dear Cec,

After 3/4 of a bottle of Australian Cabernet Sauvignon, I plucked up
sufficient courage to present my printer with Corum's paper.

Lo and behold, it worked perfectly. Even the small amount of color was
accurately reproduced.

After speed-reading it I came to the conclusion it is unnecessarily
over-complicated. What on Earth does "Voltage Magnification by
Coherent Spatial Modes" mean?

For years, my approach to loading coils at HF has been to calculate
the inductance and capacitance per unit length of coil from DC
principles. And then calculate the velocity factor and Zo from
transmission line principles. Which gives results in the right ball
park according to what few experiments I have made with actual anennas
and helices on the 160 and 80 meter bands.

Then there was G3YXM who deliberately put more turns on the coil on
the grounds it was easier to remove them than add to them in case
pruning was required. Pruning was required and he ended up by removing
all the excess turns.

Have you compared VF's (a critical parameter) in my programs with
Corum's values for close-wound coils of usual proportions? I must try
to find time to do it myself.

Thanks very much for posting me Corum's paper. I am pleased to see
the University of Nis has not been seriously affected by the bombing
and guided missiles during the US Yugoslavian attacks. Have the
bridges across the Danube been replaced yet?
----
Reg.