); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY John Miles wrote: > > 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 > > John
What's the crystal for? Crystal filters aren't usually necessary necessary. A divide by 8 conjugate regenerative divider has been built and tested by NIST. In principle it would be possible to generate F/2, F/4 and F/8 outputs simultaneously by adding parallel conjugate filtered feedback paths tuned to 3F/2, 7F/8, 3F/4, F/2, F/4 and F/8. However the difficulties associated with optimising the phase shifts and gains of all the filtered feedback paths may be more trouble than its worth. Bruce _______________________________________________ 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.
