[time-nuts] GPS and Rubidium frequency standards and noise question (new...

[Said Jackson]

Hello Javier,

I have a couple from that last Ebay lot , and the phase noise/spurs are so bad on these that I figured the 10MHz must have been generated by a DDS. I posted the phase noise and ADEV plots of this unit to this list earlier this year.

bye,
Said

Sent From iPhone

On Jun 3, 2012, at 2:19, Javier Herrero <jherrero at hvsistemas.es> wrote:

> Hello,
> 
> El 03/06/2012 10:46, SAIDJACK at aol.com escribió:
>> 
>> The FEI-5680A Rubidium that we discussed here some time ago has a much
>> worse phase noise plot of course, because the 10MHz is generated digitally
>> through a DDS, not a 10MHz crystal oscillator..
>> 
> There is a version that generates 10MHz directly through DDS, but the particular version we recently discussed a lot about generates the 10MHz signal from a 60MHz oscillator, and the DDS is used for generating the ~5.3125MHz signal for mixing with the 114th harmonic of the 60MHz to obtain the Rb resonance frequency.
> 
> I don't remember if someone did a comparison in PN performance between the two FE-5680A flavours.
> 
> Regards,
> 
> Javier
> 
> 
> 
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