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November 21st 07, 03:50 AM posted to rec.radio.amateur.antenna

Richard Clark Richard Clark is offline

Richard Clark is offline

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First recorded activity by RadioBanter: Jul 2006

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skin depth decay

On Tue, 20 Nov 2007 16:23:45 -0800, (Dave Platt)
wrote:

Bailey gives two impedance figures - the "surge"
impedance and the feedpoint impedance

Re pg 340:
"By definition, the surge impedance of a conductor
for all practical purposes is that value of load
resistance which, if placed at the end of the
conductor, will completely prevent refelcted power
from being sent back into the conductor by
the load."

Less conductor periphery, more surge Z.

Some representative values:
Thin dipole 610 Ohms (Thin = #10 wire @ 200MC)
Dipole 420 Ohms (0.5" @ 200MC)
Thick Dipole 240 Ohms (Thick = 2.5" @ 200MC)
Vertical 260 Ohms (.25" @ 200MC)
Biconical 150 Ohms

YMMV

73's
Richard Clark, KB7QHC

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