Towertalk
[Top] [All Lists]

Re: [TowerTalk] Tree attenuation

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Tree attenuation
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 07 Nov 2005 15:24:28 -0600
List-post: <mailto:towertalk@contesting.com>
On Mon, 07 Nov 2005 12:15:59 -0800, Jim Lux wrote:

>As far as HF goes, it gets quite a bit more complicated(!), for two reasons:

>1) The forest scale (height of trees, etc.) is on the same order as the 
>wavelength  (at VHF, trees are MUCH bigger than a wavelength, and leaves 
>are MUCH smaller).

>2) Most practical applications of a model have the antenna in the forest, 
>where the forest is in the near field of the antenna.

I skimmed both the Power Point and the longer document.  The analysis that went 
into the Power Point make it considerably more valuable in guestimating what 
might happen at VHF and low UHF,  but neither gives much insight into HF. 

The obvious question is, is anyone aware of anything equally good for the HF 
spectrum?  My future antenna supports are likely to be redwoods, 25-30 meters 
tall. 

Jim Brown K9YC


_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>