[time-nuts] Poor man's oven

Bob kb8tq kb8tq at n1k.org
Tue Jun 6 20:07:55 EDT 2017


In the case of a second sensor, “at the crystal” effectively means “inside the crystal package”. 
That heads you into all sorts of “interesting” problems. Better to just read the papers and do
it the “old fashioned” way.


> On Jun 6, 2017, at 7:10 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
>> There are more sophisticated control loop designs that can handle this
>> better, eg by using two temperature sensors, one at the crystal and
>> one at the heater. But designing them correctly is more difficult
>> than the normal PID loop.
> Keeping with the thread topic, I think this is the key.    For the cost of
> only one more cheap sensor you gain a lot.   Harder design as you say but
> getting help on-line seems to be free.
> I have gotten PID to work myself with linear systems (motor speed) and I
> reading up on Kalman Filters as I need them for navigation using multiple
> sensors.
> I guess one could use the crystal frequency as a measure of its temperature
> to tune the system.  Is there a name to Google to read up on using two
> sensors and a pid-like algorithm?
> -- 
> Chris Albertson
> Redondo Beach, California
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