> I know what your next question will be, "I see that these rubidium > oscillators all can be adjusted over a range that falls on both sides of > 10MHz. What should I use as a calibration source to adjust my rubidium > oscillator?" Then you think "If I have this 10MHz calibration source, why > not just run the frequency counter off that and not bother with the rubidium?" > > > OK there is good reason to use Rb. It warms up fast, it remains stable for > a long time. It is self contained and compact and does not rely on any > external signals.
You really have to tweak the heck out of a GPSDO to achieve medium-term stability comparable to that of a cheap rubidium (see attached comparison against typical and exceptional GPSDOs.) Of course, at taus greater than several hours the GPSDO will eventually win. -- john, KE5FX Miles Design LLC
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