[Antennaware] 40m vertical questions
n0rq-1 at dfwair.net
Mon Sep 22 16:43:03 EDT 2003
Greetings. I'm getting ready to start my first attempt at a 1/4 wave vertical -- for 40 meters. (Maybe 80m later on.) Perhaps someone could give a few pointers.
I'm thinking of 1" copper pipe for the first 20' and 1/2" or 3/4" for the remainder. I could "guy/dacron" it at the 20' mark if it turns out to be necessary. Is this size copper a bad idea? (It will have at least 4, probably 8 or more elevated radials (over pretty good ground).) Then, how do I tell how long to make it? For a typical dipole, 468 / 7.150 gives me a length of 32' 9", but I know the diameter of the pipe will affect this -- so how do I compute an good length? (Good guesses are appreciated, too!)
And last questions... what would be a good way to hook the coax to the base of the 1" pipe and radials?
Thanks & 73,
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