[time-nuts] NIST frequency doubler

[Dr Bruce Griffiths]

The schematic for a NIST developed, low phase noise frequency doubler is 
attached.
This device appears to perform significantly better than the Wenzel FET 
doubler specifications at least in the flicker noise region.
With suitable modifications to allow individual adjustement/selection of 
the bias for each JFET a pair of the more readily obtainable J310's can 
be substituted for the U431.

Bruce
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