[amsat-bb] Re: homemade arrow rotator motors

Marc Vermeersch amvm at skynet.be
Sun Oct 18 08:38:40 PDT 2009

Hi Joe,

I'm using geared motors (http://www.seefrid.de/images/dcgm43t42.pdf) that
can easily be controlled by a PIC running PWM. Let me know and I can send
you the schematic that I'm using to run those motors.


> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Joseph Armbruster
> Sent: zondag 18 oktober 2009 15:53
> To: AMSAT-BB at amsat.org
> Subject: [amsat-bb] homemade arrow rotator motors
> All,
> I am working on designing a rotator that the arrow antenna can snap
> into.  I am aiming for this platform to be portable, so that it could
> be packed up and taken to different events.  The base of the system
> will be a small circular rotating platform, that will provide a full
> 360 degree of freedom.  The 'arm' that will hold the antenna itself,
> will provide elevation and roll control.  I have seen a couple of
> random videos online of people that have made rotators but I haven't
> seen any that have the entire antenna mounted... or a system that
> provides for a flexible amount of movement.  I am interested in
> talking to anyone that has hacked at something like this, in order to
> discuss lessons learned.  In addition, i'd like to find out which
> motors you chose and why.  The arrow antenna with the di-plexer weighs
> roughly 2lbs.  Right now, I am looking at two different companies that
> provide stepper motors, namely:
> http://www.kelinginc.net
> http://www.linengineering.com
> Joe
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