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Re: So what antenna is better ?



If you're using it for LEO satellites, the Lindenblad is better as it has
gain near the horizon and the pattern there is circularly polarized. I built
one for 10 meters in 1993 and it was very large, but worked well.

The Eggbeater (without a ground plane) is horizontally polarized near the
horizon and circularly polarized at the zenith. I suspect that it is worse
than a vertical antenna for LEOs as there is slightly less gain near the
horizon. If a ground plane is used, the pattern points up and is not very
useful for LEOs.

The QFH is CP but the pattern points towards the zenith.

A vertical is second best for LEOs. The only disadvantage is fading if the
satellite is linearly polarized.

73,

John
KD6OZH

----- Original Message -----
From: "Andrew Rich" <vk4tec@tech-software.net>
To: "Amsat-Bb" <amsat-bb@amsat.org>
Sent: Thursday, August 18, 2005 11:09 UTC
Subject: [amsat-bb] So what antenna is better ?


> Lindenblad
> Quadrifilar helix
> Eggbeater
> ----
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----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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