[time-nuts] 5 MHz from 10 MHz

John Miles jmiles at pop.net
Mon Jul 23 08:01:42 EDT 2007

No point using an expensive divider with an 8640B.  The close-in noise is
dominated by the cavity, especially at the bandwidths used by their lock
mechanism, and the broadband floor is ECL at ~-150 dBc/Hz.  Just stick a
74xxx74 in there (what *is* considered to be the lowest-noise modern TTL
family, anyway?)

-- john, KE5FX

> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+jmiles=pop.net+jmiles=pop.net at febo.com
> Dick, W1KSZ wrote:
> > I have several 10 MHz sources that are locked to GPS. I just
> > acquired an HP 8640B that requires a 5 MHz reference input.
> > Other than building up something, are their any commercial
> > devices that will give me a 5 MHz output from a 10 MHz source ?
> >
> > Thanks,
> >
> Dick
> Wenzel will sell you a divider in a nice metal box.
> You can choose either an ultra low noise regenerative divider or a more
> conventional divider with a filter.
> http://www.wenzel.com

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