Topband: Rotator Potentiometer shunt fed twr

[Phil Duff]

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 at audiosystemsgroup.com>
>> To: topband at 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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