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Old 04-06-2011, 21:55   #94
olegsher
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Join Date: Jul 2009
Location: Mountain View, CA
Posts: 2
Forgot to answer one question

I forgot to answer the question on the gain.
Usually you can either normalize the gain, or have it graphed relative to isotropic radiator. I used the later.
Just for comparison - here are calculations for the Avant-Trivec 2055-3, and as you can see the results are pretty dead on what they claim:
Frequency 240-318MHz
VSWR 1.5:1
Polarization Right Hand Circular
Gain +10.5 dBi, 244-318 MHz
Power Handling 200 Watts CW
Axial Ratio 3 dB at half power points
Weight 3.1 pounds
Connector BNC Female

You can see that the attached charts give the same result.
Attached Images
File Type: jpg Ant_AV2055-3-1.jpg (41.2 KB, 130 views)
File Type: jpg Ant_AV2055-3-3.jpg (92.0 KB, 97 views)
File Type: jpg Ant_AV2055-3-2.jpg (61.7 KB, 82 views)
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