[time-nuts] First success with very simple, very low cost GPSDO
kd0gls at mninter.net
Thu Apr 10 16:08:08 EDT 2014
Precisely my point. My oscillator's tuning range and the timer frequency and the sampling interval dictated the minimum number of timer bits needed. In my case, as I recall, eight was not enough. Once locked, yes, but not initially.
> On Apr 10, 2014, at 14:26, Hal Murray <hmurray at megapathdsl.net> wrote:
> kd0gls at mninter.net said:
>> I should have said warm start, not cold. I was referring to the code, not
>> the oscillator. So tell me, the OCXO is warm, there's no previous EFC
>> information to draw upon, and the oscillator is off-frequency by more than
>> can be measured with, let's say eight timer bits. What do those early
>> measurements tell me, and which direction from midway should the EFC be
> What's the tuning range of the osc? 1 ppm is 1 usec or 10 counts at 100 ns.
> 10 ppm is 100 counts. That fits in 8 bits.
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