[time-nuts] Re: Ublox M6T -M8T

I just come accross this application note directly from u-blox. https://content.u-blox.com/sites/default/files/products/documents/Timing_AppNote_%28GPS.G6-X-11007%29.pdf They evaluated 8 kHz

[time-nuts] Re: OSA-5400 power transistor

uld drop down to 46 ma as a guess. If it stays high the > ovens overheating and as you are concerned perhaps a bad themistor. > Let us know how you are doing. > Regards > Paul > WB8TSL > > On Mon, May 9, 2022 at 9:11 AM Marek Doršic <mailto:marek.dor...@gmail.com>> w

[time-nuts] Re: OSA-5400 power transistor

k to keep the junction > temperature reasonable. > Regards > Paul > WB8TSL > > On Sun, May 8, 2022 at 2:14 PM Marek Doršic <mailto:marek.dor...@gmail.com>> wrote: > >> I would like to get your thoughts on my problem with OSA-5400 oscillator. >>

[time-nuts] OSA-5400 power transistor

I would like to get your thoughts on my problem with OSA-5400 oscillator. I have on old unit, which is somehow broken. I was told it was overpowered with voltages up to 32V (standard supply voltage is 24V) and even sourced with reverse polarity supply power. When I first powered it up, it

[time-nuts] Re: Microcontroller based frequency divider

I have a Raspberry Pi Pico implementation. With so many pins and state machines you can have up to 8 different frequencies. https://github.com/dorsic/PicoDIV .md > On 1 May 2022, at 00:46, Bruce Griffiths wrote: > > Modern CPLDs often have an internal

[time-nuts] TIC reference clock in 3-cornered hat

Hi, 3-cornered hat was mentioned several times past days. What reference should be used for time interval counters comparing oscillator pairs? Should internal references be used what ever bad they are? A home standard (4th oscillator)? The third oscillator C when comparing pair A-B? ...?

[time-nuts] Re: PICDIV stability (was: Crystal oscillator for a begginer)

Is there any method to measure random jitter without TimePod or scopes costing a small fortune? .md > On 9 Jan 2022, at 01:21, Bruce Griffiths wrote: > > Yes, that post is full of misleading information. > The TI document is irrelevant as the PIC based divider doesn't have non >

[time-nuts] HP53131 Power Supply shortened

Hello, while taking a measurement my HP53131a counter sparked and became quiet. After tear down I found both 3A/240V fuses in the PSU burnt. Before pluging a new set of fuses, is there a knowledge of a common problem that couses a shortcircuit at the HV side? The counter has also a

[time-nuts] Re: Project Great

Hi, I'm also one of those fascinated by Project Great and this was The project inspired me to start with time related stuf. Can Cs clock be avoided by prolonged period at high altitudes? Assume you can spend a month at the summit. Is e.g. the Rb drift stable enought to compensate and

[time-nuts] Re: constructing a moon base

Communication and navigation satellites around the Moon are already under consideration by ESA... https://insidegnss.com/galileo-update-esas-paul-verhoef-outlines-top-priorities/ .md > On 29 Sep 2021, at

[time-nuts] Re: Comparison/evaluation of u-blox timing receivers

Hello, thank you for sharing valuable comprehensive comparisions. In the high timepulse rate experiment, have you also investigated other rates than the standard 10 MHz? Most Ublox receivers use 48MHz internal clock thus the 10MHz timepulse must be missing some of the clock pulses which

[time-nuts] OSA 5400 schematics

I found a broken Oscilloquarz OSA 5400 in the shelf. It draws only 3mA of current on power up. (heating element/reverse polarity failure?) Can anybody point me to schematics somewhere around? What are the typical failures from you

[time-nuts] PicoPET - A simple timestamper

Hello, I want to share with the audience the PicoPET project . Simple time stamper or clock cycle counter based on Raspberry Pi Pico. If used with internal clk_sys PLL it can communicate through USB. With external 10MHz clock only serial output is