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.
Bruce
From: Anders Wallin <[email protected]>
To: Discussion of precise time and frequency measurement <[email protected]>
Sent: Friday, 22 July 2016 7:49 PM
Subject: Re: [time-nuts] NCOCXO anyone?
> [email protected] 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
http://www.spectratime.com/products/itest/clock-instruments/FemtoStepper/
microsemi AOG
http://www.microsemi.com/products/timing-synchronization-systems/time-frequency-references/active-hydrogen-maser/aog-110
(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.
AW
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