[time-nuts] Re. DIY atomic "resonator" 6GHz synthesizer from ADI
paulswedb at gmail.com
Wed Apr 12 09:36:48 EDT 2017
But it is as Richard said and after he sent it I remembered reading about
it in the "Quantum beat".
The trick is to get that accurate frequencies sideband to land on the RB or
CS frequency. Just 1 sideband. So using a large step synthesizer and then
another to get the finer detail is a reasonable way to go.
On Tue, Apr 11, 2017 at 10:13 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 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.
> > On Apr 11, 2017, at 10:00 PM, Richard (Rick) Karlquist <
> richard at 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
> >> 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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