[Antennas] All band vertical

2003年3月27日 09:31:54 -0600

I have been looking over an elevated-feed vertical that covers 80 to 10 
meters that I found in The Giant Book of Electronics Projects which was 
published by the editors of 73 magazine. Does anyone have any 
experience with this particular design. Is it a good antenna, are there 
problems with it? It looks like just the thing I need at this QTH.
My situation is that I am sitting on top of a sand dune that puts me 47 
feet above sea level on the highest point on the gulf coast between the 
Mexican border and the Mississippi river. It is an unobstructed 
location in any direction. Next to the house I have a 32 foot telephone 
pole that I use for antenna mounting. Being on the coast I do not want 
to use a beam since in a hurricane it would present too much wind 
resistance. The elevated-feed vertical seems like a great minimum 
resistance antenna.
In looking at the design article I think I can see some improvements 
that should be made. The matching box at the base of the antenna just 
isn't interesting to me since I might have to change settings during a 
hurricane. So I want to put the matching box at the feed point (which 
also eliminates .25 db loss) and make it automated..that is, motor 
operated capaditors or relay operated switching,,,or something along 
those lines. 
OR, and this is a question that may show my inexperience in antenna 
design, can I feed it with a 120 (approx) foot length of coax so that, 
at least on 80,40,20,and 10 meters it will be a multiple of one wave 
length and then use a tuner at the transmitter?