[time-nuts] Basic regenerative-divider questions

John Miles jmiles at pop.net
Fri Sep 28 21:51:58 EDT 2007

> You can do better than that, a single regenerative divider can be
> configured to divide by 4.
> A pair of parallel feedback paths (with amplifiers), one tuned to F/4
> and the other to 3F/4 are best.
> NIST did some work (together with Indian collaborators) on this type of
> generalised regenerative divider recently.
> Papers are stored on my Windows machine, will boot it up and locate them.

Thanks much, Bruce.  I suspected either you or Enrico R. would have some
knowledge of that.

Note that I need to end up with 40 *and* 20 MHz, hence the plan to cascade
two /2 dividers.  If there is a better topology for obtaining both of these
outputs, it would be good to know.  I'd imagine that a /4 divider running
alongside a /2 divider would be better from the additive-noise perspective.

I will probably end up wanting a 10-MHz output as well.  The obvious
question would be, should that be a separate F/8 + 7F/8 path, or a /2
divider following the /4 divider?  I haven't seen many references to /8
regenerative dividers but I suppose they'd be workable.  Availability of
8.75 MHz crystals might be what decides that question.

-- john, KE5FX

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