"Richard" wrote in message
...
A turnstile is a horizontally polarized antenna. Big downer is that from
a
polar radiation POV, from the sides, it's got a minus figure. Like -2db
or
something.

I'd call it 'circular' polarization... but OK...

Okay, flipp the turnstile so you have one dipole vertical. Not a
turnstle
anymore, and the element configuration will respond favourably to both
vertical and horizontal radiation.

What happened to the ground plane
when you did that? Is one element
touching it now? The antenna will
have a bi-directional pattern unless
you include the plane to work against
(not necessarily bad...).

But:

1) Do you have to wire up the "flipped turnstle" in a different way in
order, at the same time, (without any switching) to take advantage of:

a) mixed polarized waves?
b) vertical or horizontal waves?

The only time circular is a disadvantage is
when the incoming wave is circular, and
opposite to what you're receiving.


2) If you put up a "flipped turstile" and you wire it up to handle
mixed,
vertical or horizontal waves, what is the polar radiation patter in the
horizontal plane (ie from the sides) ? Still a minus?

It'd be a null... about like a dipole
of that polarity (I'm guessing...).


Amhoping that a "flipped turnstile" properly wired would perform with
mixed, vertical or horizontal waves coming from the sides. And hoping
better
than a turnstile.

An interesting array might be a XYZ affair,
three crossed dipoles. Switchable to
choose the best axis to null.
__
Steve
KI5YG
..