Hi If you make the cells in the basement (or even in most factories) the ability to have a wide range synthesizer will come in handy. The whole “6.834xxx GHz” thing is dependent on a number of variables. It is not at all uncommon to produce cells that come out 10’s or 100’s of KHz off of the “right number”. Wide range synthesizer = higher yield.
Bob > On Apr 11, 2017, at 10:00 PM, Richard (Rick) Karlquist > <rich...@karlquist.com> wrote: > > You always want two frequency sources. One generates a carrier > frequency offset many MHz from 6.834 GHz and the other frequency > source modulates the carrier with a sideband that is at the > exact ~6.834 GHz frequency that finds the atomic line. The > sideband is in turn modulated with audio to find the exact > center of the line. This is now the easiest section to > design. > > This architecture automatically gives you gobs of resolution. > Of course you always have the C field for infinite resolution. > The other thing it does is prevent RF leaks from exciting the > atoms, since the strong LO is safely offset from 6.834. > > Rick N6RK > > On 4/11/2017 2:59 PM, paul swed wrote: >> When I read about the frequency generation in the Rb or CS there are >> normally many numbers associated with the actual frequency. Down to at >> least the 1 Hz level. Many of these PLLs are intended for multi-KHz steps. >> I speculate you might need 2 PLLs one thats very fine in I hz increments >> that gets added to something like these PLLs that step in 200 KHz >> increments. >> Regards >> Paul >> WB8TSL >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.