On 09/23/2010 06:27 AM, Hal Murray wrote:
You’d probably want to inhibit the circuit during the two periods between
dawn and dusk to avoid what I believe is called the diurineal (sp) shift.
In that small amount of time the Rb oscillator shouldn’t drift out of spec.
diurnal
I think it's more complicated than that. The problem is that the ionosphere
layer changes height from day to night. While it's changing, there is a
slight Doppler shift. If all you want is frequency, both day and night are
stable.
Daytime involves much more changes than night-time.
The catch is that there will be a phase/time shift between day and night. So
if you mask out a few hours around sunrise and sunset, you will be modulating
your oscillator with a square wave with a frequency of 1 cycle per day.
If you can coast for 24 hours, it might work to only unmask during the night
or during the day. (whichever works better at your location)
You can run interleaved measurements of day and night-time such that
unregulated time becomes less. Trouble is, other effects will work with
the same period.
Cheers,
Magnus
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