[time-nuts] NIST frequency doubler
pvince at theiet.org
Mon Jul 9 02:40:43 EDT 2007
With a quick search of the NIST site, I couldn't find any
mention of this, and the circuit diagram in your GIF was a little
small and fuzzy: is that a crystal on the centre-tap of the secondary
of the first transformer? Would it be tuned to the input or output
frequency? And would you know the values of the components?
>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.
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