[time-nuts] Re: Simple simulation model for an OCXO?

2022-05-02 Thread Greg Maxwell
On Mon, May 2, 2022 at 10:01 PM Bob kb8tq wrote: > By far the best approach is to use actual data. Grab a pair of OCXO’s and > compare them. A single mixer setup is one easy ( = cheap ) way to do it. You > will get the sum of the two devices, but for simulation purposes, it will be > *much* >

[time-nuts] Re: "software TCXO" on commodity computers

2022-04-04 Thread Greg Maxwell
On Mon, Apr 4, 2022 at 9:02 PM Jeremy Elson wrote: > This just won the Best Paper award at NSDI 2022: > https://www.usenix.org/system/files/nsdi22-paper-najafi_1.pdf > It's a clever idea: they observe that most commodity computer motherboards > have temperature sensors onboard, and found a

[time-nuts] Facebook: Open-sourcing a more precise time appliance

2021-08-11 Thread Greg Maxwell
https://engineering.fb.com/2021/08/11/open-source/time-appliance/ Also discussed at: https://news.ycombinator.com/item?id=28140732 ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com

Re: [time-nuts] Oscilloquartz BVA has been sold. Thank you all who expressed an interest.

2020-09-26 Thread Greg Maxwell
On Sat, Sep 26, 2020 at 7:36 AM Hal Murray wrote: > > >> Can't I just use a high quality APC backup power system > >> like we use to power racks of gear in our Telco and compute closets? > > > Very few UPS's are good at long-run applications, they are typically > built to > > run a heavy load

Re: [time-nuts] Microsemi XLi SAASM

2020-03-28 Thread Greg Maxwell
On Sat, Mar 28, 2020 at 8:31 PM Tom Knox wrote: > Quick question, do the SAASM receives work as simple L1-L2 standard recovers > without the Key? I have an XLi SAASM working without the keys, didn't require any configuration. I assumed it was only using L1 CA. [I heard comments that there is

Re: [time-nuts] Modern Rb atomic reference vs classic Cs

2020-03-17 Thread Greg Maxwell
On Tue, Mar 17, 2020 at 8:52 PM Attila Kinali wrote: > On Sat, 14 Mar 2020 13:57:21 -0700 > Hal Murray wrote: > > > Can the physics-nuts calculate the Rb frequency relative to Cs? > > Theoretically yes, practically no. While we "know" exactly what > each electron in the atom is doing and how it

[time-nuts] Is 5061A by itself a primary reference? Was: Modern Rb atomic reference vs classic Cs

2020-03-14 Thread Greg Maxwell
On Sat, Mar 14, 2020 at 5:35 AM WB6BNQ wrote: > *By definition a Cesium frequency standard is just that, an absolute > primary reference ! The only difference between the 5061A and another > Cesium reference is a matter of degree of closeness to the absolute > value. For example the 5061A has a