[time-nuts] Microstepper

[paul swed]

Anders
I took an initial look at your work.
No technical comments
The presentation of details is excellent. I had not seen this quality in a
wiki. Normally very simple. Look forward to a more detailed read.
Thank you for sharing.
Regards
Paul
WB8TSL

On Tue, Jan 14, 2020 at 1:59 AM Anders Wallin <anders.e.e.wallin at gmail.com>
wrote:

> prototype block-diagram, short list of chips in the implementation, and a
> discussion on resolution now on ohwr.org:
> https://ohwr.org/project/microstepper/wikis/Block-diagram
>
> The obvious way to increase resolution (make the smallest frequency step
> smaller) is to lower the IF.
> I guess the limit is that we don't want the IF to feed-thru the
> phase-detector and PLL all the way to a PN-spur in the output-OCXO.
> My first prototype used 97 kHz IF and that gives a resolution of 1.7e-17.
> Lowering that by /2 or /4 might be a good idea?
> Other comments and ideas welcome!
>
> Anders
>
>
> > my plan is to present our DIY version of this, an open hardware design,
> at
> > EFTF2020.
> > we have two AD9912:s clocked at 1GHz (derived from the maser) producing
> > two LO's that drive a mixer-board that locks an OCXO that feeds a PICDIV.
> >
> >>
> >>
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