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Old 3-Dec-2011, 8:27 AM   #2
GroundUrMast's Avatar
Join Date: Oct 2010
Location: Greater Seattle Area
Posts: 4,773
A basic single Rhombic - 5 wavelength per leg. Gain > 16.6 dBi on all lower UHF CHs

The attached OpenOffice document includes screen shots of geometry, gain graph and plot, SWR and the 4NEC2 code used to produce the model.

The Rhombic has strong points and weak. It's cheap to build. It's big and difficult to turn.

The code is overly complex... I was using it to model a dual rhombic with dis-similar leg lengths. I love being able to use the SY cards to make code that can be adapted to variations of a geometry.

Credit to holl_ands for his input re. FR & RP cards.
Attached Files
File Type: odt Single Rhombic Lamda 5 Ver 1.0.odt (181.7 KB, 722 views)
If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)

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Last edited by GroundUrMast; 5-Dec-2011 at 3:45 AM.
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