Spot on advice.
From: Mark Johns, K0JM <[email protected]>
Sent: Sunday, April 10, 2022 9:05 AM
To: Francis F1RRJ <[email protected]>
Cc: Clint Bradford via AMSAT-BB <[email protected]>
Subject: [AMSAT-BB] Re: Antennas for Satelittes Operations.
Crossed yagis in circular polarization, such as the M2 LEOpack, are probably the most popular satellite antennas in the U.S. In Europe, I believe that circularly polarized quad antennas, such as the Wimo beams, may be a bit more popular.
While many types of antennas will work, most operators quickly become dissatisfied with various omnidirectional antennas and will switch to small beams for added gain, especially for receiving. Receive preamps near the antenna are also most helpful if feedlines are longer than 10-12 meters or so.
Also, while linear antennas (horizontal or vertical) will provide gain, they will also suffer from polarization fading as the satellites tumble in space. Circular polarization, or the ability to switch quickly between horizontal and vertical polarization, are much preferred.
--
Mark D. Johns, KØJM
AMSAT Ambassador & News Service Editor
Brooklyn Park, MN USA EN35hd
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"Heaven goes by favor; if it went by merit,
you would stay out and your dog would go in."
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On Sun, Apr 10, 2022 at 3:39 AM Francis F1RRJ <[email protected]> wrote:
Hello all,
I hope to know what kind of antenna you use for satelittes on 70cm and 2m bands (Cross yagi, Helicoidal antennas, …)
Many thanks per advance.
73s.
Francis, F1RRJ.
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