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Topband: feeding 1/2 wave verticals

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Subject: Topband: feeding 1/2 wave verticals
From: bravo at (John Tait)
Date: Wed Aug 20 13:45:03 2003

Subject: Topband: feeding 1/2 wave verticals

Hi Jim ..
               I use 1/2 wl dipoles as per Rudy N6LF... Very simple and
effective, and you don't need massive towers..
They're at
      John EI7BA

On feeding 1/2 wave vertical's which I have done on 40 meters (65 foot for
meters) by insulating the tower from the ground and matching with a coil to
ground and tapping at a low impedance point (low SWL)  Also I had to add a
small capacitance in series with the 50 ohm coax at the tap to get a 1 to 1
which will almost cover the 40 meter band from 7.0 to 7.3 mh.  Works very
as a DX ant and also an excellent ant for 80 meters as a 1/4 wave and not
even on 160 as a 1/8 wave vertical using base loading. The method of
the matching to the different bands are done with relays. This system works
for me on the three bands as I live in the city in a small lot and don't
much room for antennas.
   This same procedure should work very well on 80 and 160 on very tall
towers if a method of isolating the tower from ground can be found.    Just
thought   Jim W?NFL

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