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wire9.art
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1993-01-02
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3KB
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67 lines
SUBJECT: Wire antennas - part 9
Like I promised (oh nooooo) here are some of the wire designs I
have built here at the house. Some of these are the common mistake
antennas that we all go through or yet to have, and maybe this will
discourage some from making the same mistakes.
1) 80m Vee-Dipole: This one was a real hoser. I was a novice and
decided that a wire antenna was the answer to all my dreams. With
a tuner and this semi-correct design of mine I could work the world.
Wrong. Here it is; one leg was 55'6" and the other was 65'0". The
first leg was tied to a palm tree 25 feet off the ground. The second
leg was tied to another palm tree at 40 feet. Both legs combined at
the monster tower (26 feet). So, the antenna legs pointed up
instead of down and the angle between the legs was 85 degrees.
Needless to say it was a flop and the SWR was near the national
debt.
2)40/80m Trap Vee-Dipole: More or less the same results but I could
tune in 80m now. It worked short range very well but 40m was dismal.
3)Folded Marconi: Worked absolutely wonderful until the first
thunderstorm. I used fishing line to hold it up. The wind left it
in my neighbors yard. Following Floded Marconi antennas were
supported better and only came down when I wanted them to.
4)Coiled Marconi: Similar to the Folded Marconi, the Coiled Marconi
uses a piece of four foot by 3/4 inch PVC:
@@@@@@@@@@@@@@@@@==|| Coiled section 20 turns
/ ||
/ ||
/ ||
/ ||
/ ||
|============|| Stand-off, 3 foot insulating
\ ||
\ ||
\ ||
\ ||
\ ||
\ ||
X|| Feed point.
||
||mast
-------------------------
This antenna worked very well with a tuner and on 40m did not
require a tuner at all. Cut the 300 ohm ribbon cable (TV) to the same
values as for a folded marconi.
5)160m Spider Web Disaster: This was one of those 'Let's see what
this old transformer winding wire can do' antennas. Although the
antenna was pretty fair and I did talk to Tennessee, the antenna had
a habbit of collecting odds and ends like palm frons, leaves, birds,
branches, and these items caught the neighborhoods eye. "How is that
branch hanging there?" "Is that bird hovering? My God he's dead!!"
Needless to say, I took it down and the bird too.
-WS