[time-nuts] Switching oscillators

Bob Camp lists at rtty.us
Sun Dec 9 22:58:54 UTC 2012


You still have the "which one's right" issue. With most settling situations, the closest approach of the oscillators isn't what you are after. You are actually trying to make sure the OCXO is both on frequency and stable. A TCXO likely drifts a bit as the instrument warms up. That makes a decision tough. 


On Dec 9, 2012, at 5:54 PM, lists at lazygranch.com wrote:

> I don't know if this makes things easier or not, but the act of sampling itself is like a mixer. If you sample one clock with the other, it would produce a beat frequency. Sampling here just means a strobing a D flip flop. The output will be low frequency, so the error could be measured with a uP.
> This is just a variant on the decimation demodulators that were used before DSPs were powerful.
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