Re: Win11 ??
"David McClain (as dbm at refined-audiometrics dot com)" <[email protected]>
| Newsgroups | gmane.lisp.lispworks.general |
|---|---|
| Message-ID | <[email protected]> |
I think we can well rule out any Lisp involvement in the glitching. So I can take this offline now. - DM > On Sep 3, 2025, at 14:00, David McClain (as dbm at refined-audiometrics dot com) <[email protected]> wrote: > > I just found the manual for the FS-740 Time Standard. It does not use a Z80. It uses an ARM processor. With the OCXO option that I have, its optimal loop time constant is 250 seconds, and it updates its frequency control every 1 second. > > So nothing in there looks anywhere near to 76 minutes. > > Internal accuracy looks to be about 2e-12 in 10-30s duration. > > But I can try something else - I can manually disable the “Lock to GPS” and watch the system. The reference oscillator will be locked to its last known control voltage, and the OCXO will drift by about 0.002 ppm/day (?), 0.05 ppm/yr. IOW, it should not exhibit step jumps in reference frequency output. > > [ i just saw the 2nd glitch, about 77 minutes after the previous one. ] > > I will try to disable the GPS Lock… > > - DM > >> On Sep 3, 2025, at 13:14, Yuri Davidovsky <[email protected]> wrote: >> >> >> >>> On 3 Sep 2025, at 21:58, David McClain <[email protected]> wrote: >>> >>> In terms of DDS word-size, I would expect that the Agilent and Siglent are using 48+ bits of precision. The Icom RX is probably using a 32-bit counter. >>> >>> … >>> >>> … and I just saw my first glitch with Agilent after waiting about 50 minutes. We’ll see if it happens again in 76 minutes… >> >> Ok, I just did some napkin calculations and it appears that >> >> <image0.jpeg> >> >> = 71.5, which is 71.5 minutes for a cycle counter that counts cycles at 1MHz when the counter size is 32 bits. >