[time-nuts] FE-.5680A trimming resolution
magnus at rubidium.dyndns.org
Sun Feb 5 12:31:34 UTC 2012
On 02/02/2012 10:13 AM, Azelio Boriani wrote:
> OK, got it: no need to lock the receiver clock to birds to get stable data
> (e.g. Oncore+Cs) but the clock can be locked to birds to get even better
> data and obtain "for free" a reference clock (TBolt). The use of a stable
> clock (not locked to birds) feeding the receiver can show the various
> errors that affect the downlink having removed the clock instabilities.
Not quite right. If you lock up the clock, you do not lock to the birds,
but to GPS time or UTC as received over GPS. The observed time of the
birds would be a bad solution since you can't see a particular bird
continously unless you is in geosync orbit.
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