[amsat-bb] Re: Remoted rotator controller

Lowell White whiteld at usa.net
Thu Jun 5 05:42:35 PDT 2008

In my "someday stack" I have about 50 fiber-optic to DB-15 opto-isolator
transceivers. I have flirted with the idea of using them and (some long run
of) fiber optic cable (when found cheap enough) to run remote control for
rotors. This does, of course, presume AC power is available at the tower and
that there has been appropriate interface creation for either end.  If someone
wants to give that a go I will provide a pair or two of the transceivers.

Kind regards,


------ Original Message ------
Received: Thu, 05 Jun 2008 06:09:25 AM CDT
From: "i8cvs" <domenico.i8cvs at tin.it>
To: "AMSAT-BB" <amsat-bb at amsat.org>, "Scott Townley" <nx7u at cox.net>
Subject: [amsat-bb] Re: Remoted rotator controller

> ----- Original Message -----
> From: "Scott Townley" <nx7u at cox.net>
> To: <amsat-bb at AMSAT.Org>
> Sent: Thursday, June 05, 2008 5:51 AM
> Subject: [amsat-bb] Remoted rotator controller
> > Contemplating my Yaesu G-5400 and not so fond of the idea of running 2x
> > 6x18AWG cables nearly 200'...(more accurately, paying for them).
> > Has anyone ever put the controller at the antenna base and instead ran
> > computer<->controller wires the long distance between the computer
> > interface and the control box?  Seems like it would be a lot cheaper, in
> > the sense of fewer wires of a smaller gauge, and not so much worry about
> > voltage drop etc.  My setup is low to the ground, so the control box
> > be ground-mounted in a weatherproof shelter.  The "digital" run would be
> > the 200' or more, and the "analog" or "power" run only 20' or so.  If
> > the traditional way these lengths would be reversed.
> > Or is this a stunningly dumb idea for reasons yet-unknown to me?
> >
> > Scott Townley NX7U
> > Gilbert, AZ  DM43di
> > mailto:nx7u at arrl.net
> > http://members.cox.net/nx7u
> >
> Hi Scott, NX7U
> Theoretically it should work but are you sure that your antennas will
> moving in AZ and EL according to your computer program or are you obliged
> to go time to time upstairs over the roof just in doubt to verify the
> situation ?
> When the control box is normally installed in the shack you run wires that
> are 24 Vac for the motors and wires that are 0 to 5 V dc for the
> potentiometers.
> If you install the control box over the roof you must run a 200' cable
> between the rear 8 pin External Control DIN connector and your PC but  pins
> 4-2-5-3 are the high impedance wires connected to your PC to switch the
> relays RY1-RY2-RY3-RY4 located into the control box.
> Only less than 1 mA between each pin 4-2-5-3 and ground is enough  by
> your PC to activate each relay so that the above long run wires are more
> suscettible to get noise or RF interference or low insulation by the
> disturbing the system operation.
> Best 73" de
> i8CVS Domenico
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list