Topband: T-vertical matching
Steve Flood
flood at ixi.net
Sun Sep 25 17:57:23 EDT 2005
I am in the process of erecting a wire vertical. I could go with either an Inv-L or a T. In modeling the T design, I used a 70-ft top wire (which is my space limitation amongst the tree-tops), and a 70-ft. vertical section with the base 4 feet above ground with 4 elevated qtr-wave radials that slope up to 10 feet above ground. EZNEC gives me about 21 - j71. Using an L-network calculator, I come up with a low-pass series L of 6.37 uH and a shunt C of 205 pF. Any feedback or "better-way-to-do-it" comments? With either the Inv-L or theT, I am looking at some matching at the base. How about my MFJ949 outside at the feedpoint?
Steve KK7UV
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