[time-nuts] tbolt temperature coefficient & RMS values (as calculated in LH)

Mark Sims holrum at hotmail.com
Sat Dec 22 03:02:40 UTC 2012

Please read through the release note comments at the start of the heather.cpp file in your Lady Heather installation directory for some info on the temco and drift calculation features.

The drift numbers assume either a constant temperature or a decent DOXCO that is not affected by temperature.

The temperature coefficient numbers assume that you have the unit in a temperature controllable environment and can ramp or otherwise control the temperature.   My tbolt uses the PWMed fan speed control feature in Lady Heather to stabilize the temperature.   By shutting off the fan,  the temperature in the box rises and the change in oscillator freq with temperature is analyzed.

A lot of work was done trying to find a viable way of extracting the osc tempco from the numbers from a tbolt in an uncontrolled environment,  but nothing was successful.  There are a couple of threads in the archives discussing this.

And yes,  all the various statistics values are calculated from the filtered data shown in the plot window.  The display filter is a simple average of the next N points where N is the filter time. 		 	   		  

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