[time-nuts] cheap 5V OCXO in 14DIP has about 1E-9 drift per day

[Hal Murray]

bruce.griffiths at xtra.co.nz said:
> The 16MHz is necessary for the loop to function: The mixer mixes down the
> 26MHz to a pair of conjugate frequencies, 10MHz  and 16MHz. Thermal and
> device noise is sufficient to start the process.

> 10MHz = 26MHz - 16MHz
> 16MHz = 26MHz - 10MHz 

What makes it stable at 10 and 16 MHz rather than 10.000001 and 15.999999?

I'm assuming we are starting with a good 26 MHz crystal and that it would be hard to get filters that good.


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