OptiBeam designs their antennas using EZNEC+ and I would believe their
gain figures. A Force12 C3 is also a great performer with only two
elements per band so I am guessing that the other band elements are acting
as directors or reflectors to improve the gain. Interlaced beams are
complicated designs.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] antenna choices
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 06 Apr 2015 22:47:01 -0700
Now, look at the Optibeam numbers and description. This is a 2-el Yagi on
all bands except 10M and maybe 12M. The gain numbers are 4.3-4.5 dBd which
translate to 6.45 - 6.65 dBi (free space). That's slightly better than a
near perfect 2-el Yagi, so there's either some design magic or some
specsmanship happening here too. :)
73, Jim K9YC
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