Re: NEC-LIST: Dipoles above Ground

Jack:

Thanks for the answer back. I will look for my old measurement results
from Thailand for the 4-MHz dipole and get some numbers that can be
compared with NEC modeling, as you did for the dipoles at the same
site when you deduced from NEC which of the two sets of measured
ground constants pertained at the time of my relative gain
measurements at the zenith using the sounder method.

I am now in the middle of an office move, but hope to have my computer
set up at home next week. Then I may get a chance to model it
myself. I am remembering back to the summer of 1967, so I may have
remembered it backward. But I thought it made sense that the feed up
was better than the feed down due to a larger current moment (net)
since the horizontal E field tends to cancel near the air-earth
interface. Looking at it as a 2-element interferometer, having the
mazimum spacing between the antenna feed and its image would give more
gain toward the zenith than the other way around.

More on this later.

Regards,

George
Received on Thu Feb 17 2000 - 18:02:23 EST