On Fri, 19 Mar 2004, Sinisa Hristov wrote:
> If the wavelength is known, as it normally is, then effective area can
> be calculated from isotropic gain, and vice versa:
>
> Ae = Gi * lambda ^ 2 / (4 * Pi)
>
> Gi = 4 * Pi * Ae / (lambda ^ 2)
>
>
> The origin of this topic came from a false assumption that the "capture
> area" of a very long wire antenna is large simply because of the length
> of the wire, and regardless of the directivity.
>
> This was shown to be entirely wrong: effective area and gain are
> proportional to each other. In directions of low gain the effective area
> is small regardless of the length of the wire, or countries worked :-)
Hmmm...
So is a halfwavelength dipole a preferable antenna than a endfed halfwave
for a given band? How does an endfed fullwave or 3/2 wave antenna compare
to 1/2 wave endfed vs dipole?
73 Jason N1SU
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