[NSRCA-discussion] Servo Signals

[Ed Alt]

The Kraft  KPS-9 servo that Kraft sold with the Gold Medal radios had the variable cap.  Not sure about what may have come before it.   This was the same servo mechanics that Heathkit sold with the GD-17 and GD-19 (eventually replaced by the KPS-11 and KPS-12 servo mechanics on the GD-19).  Still have a box full of KPS-9’s from the Heathkits and they mostly work.  All the later Kraft servos used a carbon element pot.

 

Ed

 

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob Richards
Sent: Monday, June 22, 2009 1:06 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Servo Signals

 


Yes, as long as they are clean. That is the problem, it depends on contact between two components and the friction wears them out.

 

I remember years ago that the large heathkit (and possibly some Kraft) servos used variable capacitors for feedback. not much to wear.

 

Ok, Jay, how long ago were the "days" you were talking about? :-)  

 

Bob R.



--- On Sun, 6/21/09, Jay Marshall <lightfoot at sc.rr.com> wrote:

 

I remember from my days in control systems theory that the analog computers were faster and more accurate than the IBM big iron computers. Analog pots are still cheaper, lighter, and higher resolution than digital encoders – as long as they are clean…

 

 

 

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