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Topband: Shunt feeding a tower with side mounted yagi

To: <topband@contesting.com>
Subject: Topband: Shunt feeding a tower with side mounted yagi
From: k1jj@snet.net (Tom Cathey)
Date: Tue, 28 May 2002 14:36:45 -0400
Interesting info on the lower mounted Yagi on a 160M shunt fed tower!

I am in the same situation with a 110' shunt fed Rohn 45 tower with a full
sized 40M rotary dipole at 35' and a large 14el  13-32mhz  60'  boom log
periodic at 65'. Lots of mid loading!  These antennas are at optimum heights
for their jobs. This shunt fed tower also has a parasitic reflector and
director for 160M.

QUESTION:   Would I be better off just running a vertical wire (or cage)
insulated from the tower from 110' high down to the ground as a driven
element?  Since it  would be hung maybe 2' from this tower,  perhaps it
would couple into the tower so much it would be just shock excite feeding
the tower - a waste of time?  (Though, the tower would be non-resonant on
160M)

Or, would hanging it 10'-15' away from the tower make any difference?

Otherwise, I am tempted to take the two horizontal antennas and move them to
other towers and make the 160M shunt fed tower clean of mid loading.

Thanks.

73,
Tom, K1JJ
CT


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