[time-nuts] GHz output from fe5680a

Javier Herrero jherrero at hvsistemas.es
Tue Jan 31 01:27:08 EST 2012

El 31/01/2012 02:52, Magnus Danielson escribió:
> On 31/01/12 02:20, Bob Camp wrote:
>> Hi
>> Simple answer is don't bother.
>> More complex answer - of course you can. You will get a forest of 
>> spikes (every 5, MHz or so ).
> Also, since the 5,3 MHz is modulated, 1,4 kHz apart is the two 
> signals, and then a skirt of side-bands as the frequency modulation is 
> relatively quick.
> It's not clean.
> BTW. A fun hack would be to hook up the 63,8976 MHz OCXO in 
> replacement of the 60 MHz and then re-adjusting the DDS to 2.35645 
> MHz, as the 107s overtone of the OCXO minus the new DDS frequency hits 
> the Rb resonance.
> Cheers,
> Magnus
And then we will have a not less fun 10.6469MHz and 0.939Hz outputs :) 
However, if the DDS can easily be reprogrammed to large offsets (and the 
output filter is a simple lowpass...), that idea is very useful if you 
need an strange frequency and have an OCXO at 6x that extrange frequency ;)



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