[amsat-bb] Az-El Rotors

Ted k7trkradio at charter.net
Mon Jan 25 23:52:41 UTC 2016

Jeff, I made mine using brass tubing from the hobby shop. Easy to solder,
light weight. You make a small corner joint out of the next size down tubing

73, Ted

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Jeff
Sent: Monday, January 25, 2016 3:44 PM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Az-El Rotors

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.
> Kevin/W3DAD

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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