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[TowerTalk] Take off angles, VOACAP, etcf.

To: "Jim Lux" <>,"Guy Olinger, K2AV" <>, "W3YY" <>,"TowerTalk List" <>
Subject: [TowerTalk] Take off angles, VOACAP, etcf.
From: "Jim Lux" <>
Date: Sat, 16 Oct 2004 20:48:15 -0700
List-post: <>
I've been giving some thought to the VOACAP amateur radio thing..

If you run VOACAP, it displays the dominant path (and it's takeoff angle,
which is presumably what N6BV used in building the statistical tables).
However, I wonder what antenna was used. If it was an isotrope, all paths
would be weighted evenly in the selection, which will tend to favor the low
angle one hop path, as opposed to the high angle two hop path.

If you give VOACAP a realistic pattern typical of most ham antennas, which
have terrible gain below a few or 10 degrees, that might favor the high
angle two hop path, which would account for Guy's comments.



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