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Re: [TowerTalk] Jungle forest attenuation

To:, Olivier F5MZN <>,
Subject: Re: [TowerTalk] Jungle forest attenuation
From: Jim Lux <>
Date: Wed, 19 Apr 2006 11:28:08 -0700
List-post: <>
At 07:52 AM 4/19/2006, wrote:
>      I would also suggest you search on NVIS or Near Vertical Incidence 
> Skywave and Vietnam.  As Jim writes (below) much of the propagation 
> research through forests was done in the 60s and 70s in southeast Asia 
> during that conflict.  NVIS was especially valuable to the US Special 
> Forces who used HF to communicate to their HQs in the days before cheap 
> and compact stacom radios.

Indeed.. there's a bunch of work done by George Hagn at SRI back then.  A 
lot of it seems only to have been described in reports that are not 
particularly available.  It certainly hasn't made available in the ham 
literature.  There might be some conference papers in, for instance, ACES.



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