Topband: feeding 1/2 wave verticals

[John Tait]

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 http://www.iol.ie/~bravo/low_band_antennae.htm
  73
      John EI7BA

On feeding 1/2 wave vertical's which I have done on 40 meters (65 foot for
40
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
SWL
which will almost cover the 40 meter band from 7.0 to 7.3 mh.  Works very
well
as a DX ant and also an excellent ant for 80 meters as a 1/4 wave and not
bad
even on 160 as a 1/8 wave vertical using base loading. The method of
switching
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
have
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
a
thought   Jim WØNFL