Re: [time-nuts] FE-5680A software calibration units ?

> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts > wrote: > […] > I’ve tested it against GPS and as it came, it had about a 0.5 ppm error. Oops. That was supposed to be 0.5 ppb - 500 ppt. ___ time-nuts mailing list --

[time-nuts] SRS FS710 10MHz distribution amp

I see a couple on eBay, already bid up to $150. Seems rather a lot, but what do I know. The manual, including schematic is here: http://www.thinksrs.com/downloads/PDFs/Manuals/FS710m.pdf Comments? Orin. ___ time-nuts mailing list --

Re: [time-nuts] algorithms and hardware for comparing clock pulses

On 9/21/15 12:13 PM, Robert LaJeunesse wrote: The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer Module that appears to allow a single counter to be captured into independent registers from independent inputs. Not sure, but PJRC tends to run the clock fast (96MHz)

Re: [time-nuts] algorithms and hardware for comparing clock pulses

altinel...@gmail.com said: >I finally found a way to measure 1pps output from my DS3231's, with a mcu > unit, and modify the aging register on the RTC, I have been able to sync > between 2-3 microseconds between clocks by substracting and adding 0.1ppm to > 12.8ppm, with 7 bit resolution.

Re: [time-nuts] algorithms and hardware for comparing clock pulses

On 9/21/15 12:13 PM, Robert LaJeunesse wrote: The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer Module that appears to allow a single counter to be captured into independent registers from independent inputs. Not sure, but PJRC tends to run the clock fast (96MHz)

Re: [time-nuts] FE-5680A software calibration units ?

Hi Assuming it shows locked, that would suggest that (for what ever reason) it’s been re-tuned at some point after it left the factory. Bob > On Sep 20, 2015, at 9:06 PM, Nick Sayer via time-nuts > wrote: > > >> On Sep 19, 2015, at 4:20 PM, Nick Sayer via time-nuts

[time-nuts] algorithms and hardware for comparing clock pulses

Dear Time-nuts, I finally found a way to measure 1pps output from my DS3231's, with a mcu unit, and modify the aging register on the RTC, I have been able to sync between 2-3 microseconds between clocks by substracting and adding 0.1ppm to 12.8ppm, with 7 bit resolution. Since the

Re: [time-nuts] FE-5680A software calibration units ?

When I got it, the setting was zero. That suggests to me that the factory tuning was erased, assuming that the factory tunes it the same way - by changing the value adjusted by that software. > On Sep 21, 2015, at 4:34 AM, Bob Camp wrote: > > Hi > > Assuming it shows locked,

Re: [time-nuts] FE-5680A software calibration units ?

Depends on who you got it from Sent from Samsung tabletNick Sayer via time-nuts wrote:When I got it, the setting was zero. That suggests to me that the factory tuning was erased, assuming that the factory tunes it the same way - by changing the value adjusted by that

Re: [time-nuts] algorithms and hardware for comparing clock pulses

The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer Module that appears to allow a single counter to be captured into independent registers from independent inputs. Not sure, but PJRC tends to run the clock fast (96MHz) so relative timing resolution should be much

Re: [time-nuts] algorithms and hardware for comparing clock pulses

On 9/21/15 12:13 PM, Robert LaJeunesse wrote: The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer Module that appears to allow a single counter to be captured into independent registers from independent inputs. Not sure, but PJRC tends to run the clock fast (96MHz)

Re: [time-nuts] algorithms and hardware for comparing clock pulses

Hi Can, For a simple analog solution, you might try a 74HC4046 phase detector followed by a diode and RC network as used in Lars Walenius' GPSDO, described here in the archives: https://www.febo.com/pipermail/time-nuts/2014-February/082820.html The phase detector produces a pulse whose width