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[email protected] · April 5th 14, 05:33 PM posted to rec.radio.amateur.antenna

Ian Jackson wrote:
In message ,
writes
Fred McKenzie wrote:
In article ,
Wimpie wrote:

I know the "classical" definition, but we live in 2014, and when the
scope of some definitions changed over the last 20..30 years, it is
good to know how they changed to avoid misunderstandings. Visit some
antenna manufacturer's websites and see what changed over the years
(that doesn't mean that I agree with them).

1. There are industry standards, but some antenna manufacturers use
numbers and definitions to make their products more attractive. That
has not changed over the last many years.

2. The feature that defines a ground plane antenna is the ground plane,
not the vertical element.

3. Ground is relatively flat. Drooping radials to approximate a sleeve
dipole is stretching the definition of a ground plane!

The Radials of a ground plane antenna work entirely differently than the
sleeve in a sleeve dipole, drooping or otherwise.

I would question 'entirely'. In my simplistic ignorance, I would have
thought that as you increase the angle of dangle, one kind of morphs
into the other.

Does bread dough "morph" into bread when you bake it or does it become
something different?

A sleeve dipole is a dipole with a skinny and fat element. The fat element
is also a common mode choke.

A ground plane antenna is a monopole mounted over ground. The common usage
is that a GP uses an artificial ground consisting of radials.

--
Jim Pennino

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