[TowerTalk] Wire antenna?

[K9MA]

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 at sdellington.us