Ed:
Can you provide more detail on what your are trying to determine?
The coverage provided by an antenna beam is really a volume of space
rather than an area. The enclosed volume of coverage provided by the
beam lobe is a function of distance from the antenna.
An APPROXIMATE formula for beam coverage area (considering only a
single elevation or azimuth plane of the beam) can be found from the
formula:
The beam area covered by or within the lobe (in a single sweep plane) =
[beamwidth/360 x pi] x distance^2
The beam volume covered by or within the lobe can be approximated by the
formula
[1.33 x (beamwidth in one plane x beamwidth in the other plane)/129600] x
pi x distance^3
These formulas are really simple approximations. If you can provide more
details on what you are specifically trying to determine, perhaps I can
help further.
73
Steve Best
Cushcraft Corporation
______________________________ Reply Separator _________________________________
Subject: [TowerTalk] Beam lobes
Author: K4SB <k4sb@mindspring.com> at InterNet
To: <towertalk@contesting.com>
Date: 6/16/98 4:23 PM
Well, it's been over 40 years since I tried to bribe my calculus prof
for a passing grade, and have forgotten most of what little I knew then.
So, need a little help. Let us assume that we have a beam antenna with
has major lobes centered on 30 and 60 degrees. ( or anywhere else )
These lobes have a -3bd point 10 degrees ( or anything ) each side of
center.Assume F/B is infinitely high.
Is there an equation which would define only the area withing the lobe
bounderies?
73
Ed
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