[time-nuts] retry: PRS10 has spurious frequencies

SAIDJACK at aol.com SAIDJACK at aol.com
Mon Apr 23 14:39:44 EDT 2007

In a message dated 4/23/2007 11:27:39 Pacific Daylight Time,  
henk at deriesp.demon.nl writes:

>I  will zip and send off list.


>> Do you have the Vectron OCXO   specs?
> No, but someone on this list mentioned some time ago  that they sold  
> these
> units to Vectron (Bruce?) and  posted some specs, I forgot who that was
>  unfortunately...

>It is not clear to me if it is possible to measure  the PRS10 10Hz  
>phase noise spec with the Wavecrest.
>Any  idea?

I used a SIA-3000 in FFT mode for phase noise measurements, they really are  
not that great for that purpose. Don't think we can get down to -130dBc at 
10Hz  with accuracy.
Then again one could measure loads of TI data on the DTS, and do an FFT on  
that data.

>  I had a third DTS unit for parts, and that unit's Vectron was out   
> of spec
> (just shy of 100MHz at full mechanical deflection  unfortunately).  
> Datecode 1994,
>  so not too  bad.

>So, if I need parts....

No prob :)
I suspect that replacing the simple Vectron 100MHz OCXO with a more modern,  
lower noise Wenzel etc could improve the instruments performance. That OCXO  
should be locked to GPS as well of course :)

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