Tom Van Baak wrote: >> Actually, in this application will a bit of interlocking not >> hurt, as the two oscillators should longterm have the same >> frequency and interlocking will pull them together to their >> average frequency. If you further aid this interlocking by >> externally couple them together for higher frequencies (up to >> say 10-100 Hz) then you can sum their outputs and get a >> reduced noise response, a 3 dB improvement. The noise >> processes internal to the oscillators will be uncorrelated >> where as the locking causes the signals to be in phase. >> > > This is very true. I saw that HP did this in their cal lab with a > half-dozen(?) hand-picked 10811 in order to get a combined > virtual OCXO with better phase noise than any one physical > OCXO. Rick, maybe you remember some details of this cool > 10811 ensemble? > > /tvb > > Tom
Phase noise is also reduced when an oscillator uses several crystals (with the same resonant frequency) connected in series. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.