----- Original Message -----
Subject: LF: Vertical grounded tower for
LF antenna.
But wich may be the best sistem on this tower for LF, is
possible to feed directly it, may be at the top?
Any idea??
Hi Giulio, what a great opportunity to experiment
!
I don't think there is any way to excite the
tower directly, I assume that there is not another high support near by,so a
sloping wire will be the best solution, fed at the low end against a good
ground (it might be a good idea to link the bottom of the tower to this point
also).
In my experience the further away the wire is
from lossy or grounded structures the better,also a vertical wire should be as
near vertical as possible ! here we have two conflicting requirments so the
best compromise will be a wire at 45deg. Well that's my first solution
and it is possibly what you used for our contact.
However I would like to experiment
with another possibility:-
Join the sloping wire to the top of the tower,
making a very large grounded loop.
Of course it will be low impedance so all the
requirments for thick wire apply,but
it will be so large that perhaps this will not be
so important as for a smaller structure.
Well its an idea, and perhaps you would like to
try it. But if not the signal you had was very good so I hope to hear you
again soon. 73s Laurie.
