[time-nuts] Re: Microcontroller based frequency divider

I use « AVR-DIV » with ATTiny13a. Interest is that it works with one clock cycle instructions (instead of 4 clock cycles for PIC). So any integer divider can be used. Seems to work as well as PIC although I did’nt formally verify. Gilles. > Le 30 avr. 2022 à 23:55, Simon Merrett a écrit : >

[time-nuts] Re: PICDIV stability

Would an « AVRDIV » have similar performances, with similar 8 pins processors such as the Attiny13a ? Advantage : it features one cycle instructions, so possible to divide by many other factors (including odd numbers) GC > Le 8 janv. 2022 à 04:05, Tom Van Baak a écrit : > > All -- The 2012

[time-nuts] Re: in-ground clock room

in-ground clock room (Joseph Gwinn) > 8. Re: in-ground clock room (Steve Allen) > 9. Re: in-ground clock room (Scott McGrath) > 10. Re: in-ground clock room (Dana Whitlow) > 11. Re: in-ground clock room (Gilles Clement) > 12. Re: in-ground clock room (John Marvin) > 13.

[time-nuts] Re: in-ground clock room

With a slight cantilevered cavity at the base, instrumental as a *nut cracker… o:)) * = time? > Le 9 sept. 2021 à 18:35, Dana Whitlow a écrit : > > One might also consider mounting smaller items inside the cylinders of the > engine block, > to get the most out of its thermal mass. > > Dana >

Re: [time-nuts] Long Wave Radio-Frequency standard testing

Bob kb8tq a écrit : > > Hi > > As you throw away samples that are far off the mean, you reduce the sample > rate ( or at least create gaps in the record). Dealing with that could be > difficult. > > Bob > >> On Jan 18, 2021, at 1:33 PM, Gilles Clement

Re: [time-nuts] Long Wave Radio-Frequency standard testing

> Hi > > Very cool !!! > > The red trace is obviously the one to focus on. Some sort of digital loop that > only operates under the “known good” conditions would seem to make sense. > > Thanks for sharing > > Bob Hi, I tried something with the idea to consider night records fluctuations as

Re: [time-nuts] Long Wave Radio-Frequency standard testing

Hi Paul, > I guess I would ask what the goal of the effort might be. > It seems like a good answer. One thing I was amazed buy was that back in > the 1960s HP wrote some papers on using WWVB. What they did was check the > offset at distance everyday about the same time. This offered quite a bit >

Re: [time-nuts] Long Wave Radio-Frequency standard testing

iny out of > resonnace tuning, problem of the interferences from domestic electrnic > pollution (computers with sync of monitors, led drivers...). The archiyecture > of the receiver is also tricky : no AGC (introduces phaseshift), heavy > filtering (where : antenna, receiver...) > On Frida

[time-nuts] Ticking Toward a Nuclear Clock

>From time-nuts to time-nukes ! https://physics.aps.org/articles/v13/152 I like it, Gilles (retired nuclear engineer) ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] eLORAN in the Antipodes ? (was: Re: eLORAN will be on the air GRI 99600)

Would’nt 100khz carrier propagate mostly by ground wave (during day time) ? So following earth curvature ? Gilles. > Le 7 août 2020 à 21:34, paul swed a écrit : > > Taka > Yes it does. More ionosphere than air. It would be skywave or indirect > path. I mentioned that earlier. > Now silly

Re: [time-nuts] Frequency division by 81

then divide the 162 kHz signal, but if not, you will not be happy. > > Best regards > Ole > >> Den 21-06-2020 kl. 09:30 skrev Gilles Clement: >> Hi, >> Comparing a reference signal at 162kHz with local 10MHz ocxo. Expected Adev >> 10E-11 at 10sec. >>

Re: [time-nuts] Frequency division by 81

; meet > that same basic requirement. While it *sounds* like it would improve things, > it > very much depends on the details. > > What are you trying to do? What is the input frequency? What is the phase > noise > requirement? > > Bob > >> On Jun 20, 202

Re: [time-nuts] Frequency division by 81

b L. > >> Sent: Friday, June 19, 2020 at 10:27 AM >> From: "Gilles Clement" >> To: "Poul-Henning Kamp" >> Cc: "Discussion of precise time and frequency measurement" >> >> Subject: Re: [time-nuts] Frequency division by 81 >

Re: [time-nuts] Frequency division by 81

Hi, Could you point me to a practical design example of a Pi divider ? Envoyé de mon iPad > Le 19 juin 2020 à 08:56, Poul-Henning Kamp a écrit : > >  > >> I need to divide the output of an OCXO by a factor D=81 for testing >> purposes. So with minimum added phase noise. > > Two

Re: [time-nuts] Frequency division by 81

by Didier Juges) What would be the down sides for a Clock signal ? Gilles. > Le 18 juin 2020 à 13:58, Gilles Clement a écrit : > > Hi > I need to divide the output of an OCXO by a factor D=81 for testing purposes. > So with minimum added phase noise. > PICDIV-like approches would

Re: [time-nuts] Frequency division by 81

Thanks for all your replies. Very interesting, A lot to digest. Best, GIlles. Envoyé de mon iPad > Le 19 juin 2020 à 01:12, Richard (Rick) Karlquist a > écrit : > >  > >> On 6/18/2020 4:58 AM, Gilles Clement wrote: >> Hi >> I need to divide the o

[time-nuts] Frequency division by 81

Hi I need to divide the output of an OCXO by a factor D=81 for testing purposes. So with minimum added phase noise. PICDIV-like approches would not work (D needs to be divisible by 8 or at least be even) I went through the archives and it seems that an Injection Locked Frequency Divider with

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

Hi Magnus, Quite interesting. Could you point us to one or rwo pages developing please ? Thx. Gilles. > Le 8 mars 2020 à 10:54, Magnus Danielson a écrit : > > H > >> On 2020-03-08 07:38, Poul-Henning Kamp wrote: >> >> In message <5583e434-4c72-4a4f-a60b-75a4204ef...@n1k.org>, Bob

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

Hi, How do you optimally tune the control loop time constant ? (Mine gets quite unstable when the update rate is slow - and the amplitude of the change step low - enough not to degrade the OCXO performance ) Is there a method described somewhere (like the Ziegler–Nichols method for PID) ? Thx,

Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

Well said, been looking for this « tutorial» eagerly myself too. GC. > Le 28 févr. 2020 à 11:35, Attila Kinali a écrit : > > On Thu, 27 Feb 2020 08:45:16 -0800 > "Richard (Rick) Karlquist" wrote: > >> OTOH, you could build a simple Colpitts >> oscillator and see where it oscillates. >>

[time-nuts] Hp10811 parts ref

Dear list, Looking forward to apply the oven configuration of the 10811 oven oscillator - that is working so well - could you please help me identifying the appropriate references for the active parts : Q7 and Q8 heating darligntons PNP Q4 driving transistor PNP U1 and U3 op amps >From the

[time-nuts] Division and resolution

Hi, Can we consider that the phase data record obtained from a Divided Frequency source is equivalent to reducing resolution from the phase data record obtained from the undivided source ? In such case the “effect of data resolution” discussion from following paper:

Re: [time-nuts] new WWVB BPSK dev board

Hi, In France the carrier frequency is 162khz (Allouis) Phase modulated over one minute. Gilles. Envoyé de mon iPad > Le 5 déc. 2018 à 00:57, Paul Bicknell a écrit : > > Hi Nigel > > I moved from Warwickshire to west Sussex south of the downs 20 years ago > and all was OK But since it moved