[TowerTalk] Re: [TowerTalk] Data on attenuation by trees? repl y de KØFF

[Jerry Keller]

Right!  And they also found a way to use the root systems for grounds,
eliminating the need for all those bloody radials. Hurrah!  K3MGT

----- Original Message -----
From: Pete Smith <n4zr@contesting.com>
To: <towertalk@contesting.com>
Sent: Wednesday, November 22, 2000 10:23 AM
Subject: Re: [TowerTalk] Data on attenuation by trees? reply de KØFF


> At 10:19 AM 11/22/00 -0500, Jerry Keller wrote:
> >I, too, live in the woods now. (Luckily, I also live on top of a pretty
good
> >hill.)  It never really mattered much to me in any previous QTH, but I've
> >always heard that RF absorption by deciduous trees varies from summer to
> >winter, depending on the density and height of the surrounding forest,
and
> >the moisture content of the leaves. I have no idea how measurements that
> >would account meaningfully for all the variables could be taken, but it's
> >such an obvious question that somebody somewhere must have tried
sometime.
>
> I'm relatively sure that the studies were done in the context of the war
in
> Vietnam, when the operational requirement for HF communications through
> various amounts of vegetation was pretty critical.  I think it was also in
> that period when someone actually developed a device for DRIVING a tree as
> an antenna at HF, using some sort of coupling collar.  Let's hear it for
> DARPA!
>
> 73, Pete Smith N4ZR
>
> Contesting is ... Extreme Radio
>
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