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
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