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Old July 21st 06, 08:44 PM posted to rec.radio.amateur.antenna
Reg Edwards Reg Edwards is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 167
Default Length & number of radials again

Radials Continued.

Perhaps some kind person who has been able to afford the latest issue
of NEC4 could calculate the radiating efficiency of a typical vertical
antenna of height 9 metres (29.5 feet) and diameter 50mm (2 inches) -

- when fed against a ground system of 50 uniformly distributed radial
wires, each 1.64mm in diameter (14 AWG) buried to a depth of 25mm (1
inch), of length 10 metres -

- in soil of typical resistivity = 150 ohm-metres and permittivity =
16.

But first I should like to ask, can NEC4 complete such a calculation
without human intervention or assistance? If yes then please
continue, perhaps keeping a record of the time involved.

Using program RADIAL_3 the answer is - Radiating Efficiency = 86.0
percent.

If several of you participate, perhaps using different tools, it would
be interesting to compare results. By all means, join in!

Thank you for your assistance.
----
Reg, G4FGQ.