[time-nuts] GHz output from fe5680a
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:
>> 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.
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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