[time-nuts] New Subscriber, DIY GPSDO project (yes, another one)

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Mar 8 15:53:29 UTC 2020


--------
In message <5f5e8822-006f-a059-51f8-d6a986300811 at earthlink.net>, jimlux writes:

>The conceptual idea being similar to setting a PLL Loop filter bandwidth 
>such that the reference noise (multiplied up) and the VCO noise are the 
>same at that point?

I tried that, and got absolutely no where, because the noise-spectra
are not flat or even comparable.

Instead started to look at the time distribution of the zero-crossings
of the residual low-pass filtered phase error, and that has given me
much better results all in all.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.




More information about the Time-nuts_lists.febo.com mailing list