John:

What particular rotor do you have?  Is it a CDR product such as a 
Tailtwister or TR44 or Ham-X?

Jack K8ZOA




John Ferrell wrote:
> This seems to be taking on a life of its own!
>  5 degrees is accurate enough for my needs.
> If I damage the sensor pot I am not sure I can repair or replace it.
> I have tried the capacitor but I am using a development board that does not 
> make getting a cap directly on the AD pin easy.
>
> John Ferrell    W8CCW
>
> "All that is necessary for the triumph of evil is for good men to do 
> nothing." -- Edmund Burke
> http://DixieNC.US
>
> ----- Original Message ----- 
> From: "Jinx" <joecolquitt@clear.net.nz>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Wednesday, May 07, 2008 7:03 PM
> Subject: Re: [PIC]Analog signal conditioning
>
>
>   
>>> Yes. If that 512 mv was stable my rotation measurement would
>>> be simple
>>>       
>> If the pot can have Vcc (I haven't met a pot that couldn't take
>> 50mW), that would reduce the impedance and possibly make
>> the noise disappear. Even something as simple as a capacitor
>> on the ADC input may help
>>
>> Also improve resolution too, if that matters. Currently you'd be
>> looking at about 1mV/degree over 450 degrees travel at the
>> pot wiper
>>
>> With 5000mV reference, unamplified 521mV would mean about
>> 5 degree resolution (ie 5000/1024 = 5mV per ADC bit)
>>
>>
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