[amsat-bb] Another Rotor Design - Great Fun, Easy to Build and Very Cheap

Thomas Doyle tomdoyle1948 at gmail.com
Sat Dec 5 18:29:20 UTC 2015

Thanks Phil,

It is an updated version of a table top rotor I did several years ago.

The idea was to have a pointer that would point at the satellite so I knew
where to point a hand-held Elk. It worked fine. This one is smaller and of
course works with SatPC32.

The steppers are too good a deal to pass up. To keep the size and cost down
they designed a stepper with a high step angle of 5.625 degrees. They are
geared down 64:1. Amazing amount of torque for such a little motor. Five of
them with ULN-2003 driver boards for $16. I believe they could turn fairly
large bread slicer capacitors and a rotary inductor as used in antenna
tuners. A homebrew mechanical automatic antenna tuner would be an
interesting project.


73 W9KE tom...

On Fri, Dec 4, 2015 at 10:43 PM, Phil <phil_lor at bigpond.com> wrote:

> On 05/12/15 02:31, Thomas Doyle wrote:
>> Hi,
>> http://www.tomdoyle.org/3dPrinterRotor-1
> That's really cleaver Tom. I imagine that the rotator would only handle
> the lightest of aerials.
> --
> Regards,
> Phil
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Sent from my computer.

tom ...

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