[amsat-bb] Az-El Rotors
lists at rudn.com
Mon Jan 25 23:43:35 UTC 2016
On 1/25/16 9:08 AM, A. Kevin Arber wrote:
> Agree about the "Eggbeater" style. When I first returned to the sats I
> homebrewed a couple and they worked fine. But even better is a Moxin style
> which provides gain and circular polarization. See Larry Cebik"s article
> in August 2001 QST. I built these and they worked great for the LEOs.
> Great for portable too, as are omnidirectional.
I prefer them over the Eggbeater/Texas Potato Mashers, and the Moxons
are a Field Day favorite for the linear transponder birds. Easy to set
up, and with a small field day operation, I like simple. Have been able
to work someone on pretty much every pass.
Never tried them for the FM birds or ISS contacts, I don't think they'll
do well there at all during Field Day. Maybe normal operation, they
would be "just okay" to "meh, need something better someday".
Image of the ones I built for field day:
The design PDF is at http://www.oocities.org/w9bci/VHFUHFSatelite.pdf.
The next iteration of the 400MHz antenna will use an appropriately sized
rod rather than 12g copper wire.
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