Re: [time-nuts] syncronized clocks

2015-09-18 Thread Can Altineller
Hello All, Thank you for your illustrious answers. I suspected that the RTC's were fake when someone alerted me on a forum, 43oh, when I was trying to make them work with energia, and a TI microcontroller. A forum member stated: "What does have me curious, is how cheap that is--since the DS3231

Re: [time-nuts] syncronized clocks

2015-09-18 Thread Chris Caudle
On Thu, September 17, 2015 8:26 pm, Can Altineller wrote: > b. If we put two rubidium sources, and have them warm up and stabilize, > and then hook up a 2ch scope and observe the pattern, will there be a > phase difference between the 10mhz signals? (without the scope doing any > syncing) Any two

Re: [time-nuts] syncronized clocks

2015-09-18 Thread Mike Cook
> Le 18 sept. 2015 à 03:26, Can Altineller a écrit : > > Hello All, > > Thank you for your illustrious answers. I suspected that the RTC's were > fake when someone alerted me on a forum, 43oh, when I was trying to make > them work with energia, and a TI microcontroller. A

Re: [time-nuts] syncronized clocks

2015-09-18 Thread Pete Stephenson
On Fri, Sep 18, 2015 at 3:26 AM, Can Altineller wrote: > Hello All, > > Thank you for your illustrious answers. I suspected that the RTC's were > fake when someone alerted me on a forum, 43oh, when I was trying to make > them work with energia, and a TI microcontroller. A

Re: [time-nuts] syncronized clocks

2015-09-17 Thread timeok
Dear CA, In my document describe my Frequency and Time standard you can find some info about the difference and limit of the two solution. GPSDO and Rubidium frequency standard can be alternative or complementary, depends on your goals. see:

[time-nuts] syncronized clocks

2015-09-17 Thread Mike Cook
> Le 17 sept. 2015 à 02:00, Can Altineller a écrit : > > Hello, > > I started putting a test setup together when I suspected the DS3231 RTC's I > got from dx.com were fake. So I put 2 mcus, each measuring microseconds > from each 1PPS output with an interrupt, for the

Re: [time-nuts] syncronized clocks

2015-09-17 Thread Pete Stephenson
On Thu, Sep 17, 2015 at 2:00 AM, Can Altineller wrote: > Hello, > > I started putting a test setup together when I suspected the DS3231 RTC's I > got from dx.com were fake. So I put 2 mcus, each measuring microseconds > from each 1PPS output with an interrupt, for the unit

Re: [time-nuts] syncronized clocks

2015-09-17 Thread Tim Shoppa
Wow, you're all over the place here :-) The "1-2 microsecond drift every second" you observe for the two RTC's relative to each other, is entirely consistent with the few ppm spec for that device. If you start tweaking the trim frequency you should be able to get it trimmed to better than a ppm

[time-nuts] syncronized clocks

2015-09-17 Thread Mark Sims
A friend of mine is the clock chip guru at one of the major semiconductor manufacturers. He said that the jitter in clock chip oscillators is rather horrendous. Getting an oscillator to reliably start and run smoothly on nanowatts of power is the major design issue for clock chips. Jitter