Original article from: Wayne Sarosi
Reposted by Rob Dennis,Moderator HAM_TECH,for use of the FIDO HAM_TECH echo.
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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
egs
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 Folded 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
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This antenna worked very well with a tuner and on 40m did not require a
uner
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
ennessee
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
--- GoldED 2.42.G1219
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* Origin: VE3SJN....Moderator....HAM_TECH (1:163/506.4)
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