On 7/1/2019 22:24, Richard (Rick) Karlquist wrote:
On the frequency of full wave resonance,
they still make sense because they are two half waves in phase
and behave similarly to a half wave dipole.
For an end fed wire, this is not true. Its pattern has 4 lobes, a
cloverleaf. It is like a full wave fed 1/4 wave from one end. That's two
half waves OUT of phase. A center fed full wave is indeed two half waves
in phase, and has the dipole-like pattern, a bit sharper, with a bit of
gain over a dipole, and a very high feedpoint impedance.
Because of the cloverleaf pattern, an end fed full wave can be quite
useful. At higher harmonics, the lobes proliferate, and tend to get
concentrated towards the axis of the wire, which is often less effective.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
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