Re: NEC-LIST: Modeling a Living White Pine Tree at HF (Conductivity of Tree)

Chuck:

I will have to dig out my old paper on the electrical properties of
living vegetation that I did for a DOD symposium I helped set up at
the end of the Vietnam War. It is now packed away, and I am off to go
bowhunting for deer later today. I will be back in 1 1/2 weeks and
then get back to you with data vs frequency for the pine tree.

George

Original Message:
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From: Chuck Counselman ccc_at_space.mit.edu
Date: Fri, 17 Nov 2000 11:41:11 -0400
Subject: Re: NEC-LIST: Modeling a living White Pine tree at HF

On Nov. 12th I wrote:
>How should a living White Pine tree be modeled at HF?

..to which George Hagn <ghagn_at_pop.mail.rcn.net> replied:
>...you could use sigma of about 10-6 S/m for the tree conductivity....

I'm bothered and confused. This (10^-6 S/m) seems an extremely low
conductivity. A tree trunk having cross-sectional area of 1 m^2 would
have a resistance per unit length (vertically) of 1 Megohm.

Is my mental arithmetic screwed up again (which it is painfully
often); are you remembering the conductivity value in some other
units; or what?

-Chuck
Received on Sun Nov 19 2000 - 19:01:47 EST