I'm thinking about building this:
http://www.repeater-builder.com/rbtip/exposeddipole.html
However, I'm having trouble reproducing the calculation that yields a
63.8 inch coax length. I'm assuming the velocity factor is .67 and
keep getting 68 inches for a 5/4 wave...off from 63.8 inches as in
the article. I can reproduce the 40.8 inch dimension (3/4 wave)
within a fraction of an inch....
I'm using L = 246/F*Vf for a quarter wavelength (about 13.5 inches).
What am I missing? I'd like to understand where the numbers come
from before I start cutting aluminum and coax....
Steve, KE4MOB
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