Re: Topband: Rotator Potentiometer shunt fed twr

[Phil Duff <na4m@suddenlink.net>]

At least 2 rotor manufacturers (Orion, Spid) have used a simple pulse 
encoder scheme for some time instead of a pot strip indicator.  A 
magnetically actuated reed switch generates pulses when the rotor turns 
that are fed to pulse counting circuitry in the rotor controller.
de NA4M


On 2020-08-24 10:30 AM, Joe wrote:
> Has anyone thought of trying to make up a rotor position indicator 
> using like a home brew encoder as described in the latest QST?
> Joe WB9SBD
>
> On 8/23/2020 6:18 PM, Larry via Topband wrote:
> > I use wire wound pots in both my rotators and have experienced 
> > problems with them burning out on certain TX frequencies.
> > Wound some small toroid transformers and soldered them at each of the 
> > three pot leads (at the rotator). Problem solved.
> > larryn7dd
> >
> >
> > -----Original Message-----
> > From: Jim Brown <jim@audiosystemsgroup.com>
> > To: topband@contesting.com
> > Sent: Sun, Aug 23, 2020 10:17 pm
> > Subject: Re: Topband: Rotator Potentiometer shunt fed twr
> >
> > On 8/23/2020 2:39 PM, Phil Duff wrote:
> > > Aren't most rotors and their masts normally grounded thru the rotor 
> > > body
> > > and mast clamp & mounting bolts to their tower/support?
> > Antenna current at the joint between the two pieces of the rotator is a
> > common source of IMD, as first articulated by W3LPL (although he calls
> > it something else).
> >
> > 73, Jim K9YC
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