[Amps] Auto tune conversion using stepper motors?

[peter chadwick]

Being somewhat cynical, I would rather rely on a system with microswitches to detect the end points rather than  electronics - far less to go wrong. It's not difficult to do.

73

Peter G3RZP



========================================
 Message Received: Apr 27 2014, 09:10 AM
 From: "Markku Oksanen" <ww1c at outlook.com>
 To: "Colin Lamb" <k7fm at teleport.com>, "Amps" <amps at contesting.com>
 Cc: 
 Subject: Re: [Amps] Auto tune conversion using stepper motors?
 
 Hi
 Thanks for the ideas. 
 
 Does anybody have a good idea how to find the "zero point" on vacuum cap without adding a potentiometer for position feedback?  I was thinking about reflective optical sensors and setting them up so that when the cap opens up totally, the gap between the sides of the capacitor are detected as a drop of reflection .  These sensors are really inexpensive, only thing is how to position them correctly and accurately.
 Markku
 
  		 	   		  
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