Bruce wrote:
And I'm still amazed I lucked out with the rubidium module.
Actually, the unit's PN and ADEV performance would almost certainly be considerably better with a good OCXO instead of the Rb.
At low tau, the PN and ADEV performance of a GPSDO is determined by the local oscillator (generally, an OCXO or Rb). The OCXO is better with respect to PN and ADEV than a Rb out to tau >~1000 seconds, so in the very important area of tau <1000 seconds, the Rb unit loses to the OCXO unit. Above tau >~1000, the averaged GPS signal governs PN and ADEV performance, so you never really benefit from the Rb oscillator.
Unless holdover performance is the most important criterion (which it almost certainly will *not* be for a time nut), a GPSDO with a good OCXO is superior at all tau to one with a Rb.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
