twin crystal oscillator

while im waiting for my OCXOs to arrive and thinking about what makes one
OCXO better than others with regard to 1hz phase noise, i thought what if 2
crystal/amp stages were used for the oscillator, the bandwidth must be
reduced quite considerably and hence the close in phase noise too.

not much came up on a search, maybe i will build one and see. i have read
that very old crystals are better becuase their ageing has settled down to a
low rate and are the larger size gives better Q.

Colin =^.^=


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