[time-nuts] NCOCXO anyone?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Jul 22 04:19:43 EDT 2016

No, the first one merely uses a pair of cascaded heterodyne PLLs as shown on p3 of the manual.A diophantine setup may be useful here if one wished to construct something similar.


      From: Anders Wallin <anders.e.e.wallin at gmail.com>
 To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Friday, 22 July 2016 7:49 PM
 Subject: Re: [time-nuts] NCOCXO anyone?
> richard at karlquist.com said:
> > Also in 1996, phase microsteppers were already legacy technology and
> didn't
> > have a good reputation for spectral purity.  Another non-panacea.
> What is a phase microstepper and/or how does it compare to a DDS?
> (Google gets lots of hits, but they all refer to motors.)

H-maser aging is typically compensated by something like
spectratime femto-stepper
microsemi AOG
(there are probably others, please post if you know about them!)

afaik they contain a OCXO/BVA that is steered based on a DMTD measurement
against the input reference.

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