[amsat-bb] Re: G5500 Rotor motor Question

Thomas Doyle tomdoyle1948 at gmail.com
Mon Apr 29 11:59:05 PDT 2013

Has anyone measured the gear reduction used in the rotor to compute the raw
speed of the motor.  I have always been a fan of checking theoretical
calculations with actual measurements to make sure we stay within the

Fortunately I have never had to take my G5500 apart so have never checked
the gear ratio.

W9KE Tom Doyle

On Mon, Apr 29, 2013 at 11:29 AM, David Palmer KB5WIA <kb5wia at amsat.org>wrote:

> Oh, I didn't measure the rotation speed of the motor during my rebuild,
> unfortunately.  In all the research I did prior to the rebuild (=scrambling
> to find an equivalent motor) I didn't see any published specs on the unit
> either.  I'd think Domenico's calculations would probably be the closest,
> since it is a simple 2-pole AC motor.
> 73! Dave KB5WIA
> On Sun, Apr 28, 2013 at 2:31 PM, Gregory Beat <gregory.beat at comcast.net
> >wrote:
> > You could ask Dave Palmer, KB5WIA if he noted that spec.,
> >  when he rebuilt his Yaesu motor last year (March 2012)
> > http://kb5wia.blogspot.com/2012/03/yaesu-g5500-rotator-motor-repair.html
> >
> > w9gb
> > ==
> > From: "Mike Hoblinski"
> > To: <amsat-bb at amsat.org>
> > Subject: [amsat-bb] G5500 Rotor motor Question
> >
> > Anybody know what the rpm of the AC motors are. I know from the Yaesu
> > specs that after all of the gear reduction they list EL as 67 seconds for
> > EL
> > and 58 Seconds for AZ.
> >
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Sent from my computer.

tom ...

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