Re: [amsat-bb] GRRRRRRRRRRR!

[Jon Ogden <na9d@xxxxxxxxxxxxxx>]

on 3/2/01 4:57 AM, John / NS1Z at ns1z@arrl.net wrote:

> Now that is a reallly nice installation. They still look to be linear
> polarized, however. I think I have the same number of antennas in my back
> yard as you have on your roof.... well, I might be short one dish. How can a
> woman complain about that?????

John,

Take a closer look.

1.) Yes, each antenna is a linear antenna.
2.) Look at how the elements though of each antenna are actually orthogonal
to each other.  Look at the last picture.  On the left antenna, the 2m
elements run from the bottom left to the top right.  On the right antenna,
the 2m elements run from the top left to bottom right.
3.) The two antennas are fed 90 degrees out of phase to each other, hence
giving CP.  That's all that a normal CP antenna is.  It's really two
antennas fed 90 degrees out of phase except that both are on the same boom.

This set up is really quite nice.  For about $150 or so and a little hard
work, you have a dual band CP set up in a small space.  Sure, it might be
difficult to work a weak AO-10 at apogee with these, but for the LEOs you
would have a GREAT set up.  And (hope against hope) if AO-40 has a
miraculous recovery of its V and U transmitters, you'd have a nice AO-40
setup as well.  All for a fraction of the bigger CP antennas.

73,

Jon
NA9D

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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