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On 25/07/2019 20:50, Mike Berg wrote:
My previous method using the PIC involved setting the output to
10.000MHz connected to a relatively accurate frequency counter for
Then I ramped the oven temp up to about 40C for a place to start.
The outter shield wasn't soldered yet and I had the thermistor
taped to the outside of the oven above the crystal.
This was wrapped in foam for insulation in order to stabilize my
I had a current meter in series to monitor the oven's state.
I tracked the freq shift down til it leveled out and my temp was
showing abit under 45C.
I waited for everything to stabilize which took 20 min or so.
My PIC code has a calibrate function so I entered in the offset to
make my counter show 10.000MHz.
Then I played with that while using a receiver to zero beat WWV,
calibrating both the PIC and the counter in the process (for the
moment, it's a $100 counter :)
I didn't notice the wayward drifting til I started using it in the
U3S and racking up some hours.
I hope this clarifies things.