); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY From: "John Miles" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Basic regenerative-divider questions Date: Fri, 28 Sep 2007 18:51:58 -0700 Message-ID: <[EMAIL PROTECTED]>
> ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > > > 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. The article in question is... http://tf.nist.gov/timefreq/general/pdf/1890.pdf but also http://tf.nist.gov/timefreq/general/pdf/1800.pdf See for yourself. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
