Poul, You did not really answer the basic question: "Does the 2.5 Hz (or 5 Hz if applicable) C-field reversal cause the 2-sec bump in the ADEV plot for the PRS-10?".
BTW, some radio hams are involved with microwave and even MMW communications between mobile stations, and I'd bet they benefit quite a bit from any scheme that reduces magnetic field sensitivity of their frequency references. Therefore, the C-field reversal thing cannot be *all* bad. Dana K8YUM Dana On Thu, Nov 18, 2021 at 2:41 AM Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > -------- > Matt Huszagh writes: > > "Poul-Henning Kamp" <p...@phk.freebsd.dk> writes: > > > > > The PRS-10 switches the polarity of the C-field solenoid at 5Hz to > > > cancel out varying external magnetic fields. > > > > > > If that is not a concern for you, for instance because you use it > > > in a stationary application, it can be disabled with the "MS0" command. > > > > > > It's all in the manual. > > > > How does the 5Hz switching relate to the 2s hump in the ADEV plot? > > The manual says: > > "[...]the current in the coil is switched at a 5 Hz rate." > > You can either read that as: > > "There are five positive and five negative periods every second" > > or > "The sign changes five times per second" > > It is not entirely obvious which reading is the correct one. > > When I experimented with it ages ago, I concluded the latter fit > my data best, but that was a pretty early firmware version, with > quite a number of variances from the manual. > > If your ambient magnetic field is stable, and it should be for > time-nuts purposes, modulating the hyperfine transition is a bad > idea, no matter the frequency. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@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. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.