Another way to look at it is that it multiplies the radiation resistance, but does the
same for the ground resistance. So efficiency is unchanged.
On 10/1/2013 12:40 PM, Roger D Johnson wrote:
This is NOT true! It merely raises the feedpoint impedance...just the same as
adding a
4-1 transformer.
73, Roger
On 10/1/2013 3:10 PM, Barry LaZar wrote:
As I read your post, I infer that at the moment you are wanting to add 160
meters to
your capability. An antenna that I have used and liked is the Twin Lead
Marconi. It's a
simple, cheap, and effective antenna. I first saw it written up by Bill Orr
years ago.
The premise of the design is that a quarter wave antenna driven against ground
may not
be the most efficient antenna due to low radiation resistance. Therefore, raise
the
radiation resistance by using the theory of a folded dipole. The folded element
raises
the radiation resistance by a factor of 4 for 2 elements as the impedance
changes as the
square of the number of elements. You will still need radials, but your ground
losses
will decrease.
73,
Barry
K3NDM
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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