Re: [time-nuts] Low noise quartz crystal oscillator by Bruce Griffiths

Hi They do it pretty much the same way everybody else makes the same sort of oscillators. Design, build, tune / select, test, re-tune/ select, re-test. The amount of test / tune depends enormously on what level of oscillator is being made. > 80% of the volume shipped gets relatively less

Re: [time-nuts] The Pendulum Paradigm by Martin Beech, 2014

On 10/28/15 7:48 PM, Jim Lux wrote: On 10/28/15 7:23 AM, Peter Reilley wrote: I have been pondering pendulum clocks. I was wondering what the ADEV of a pendulum would show. I assume that you could see the errors in the gear train. You should see the period of each gear. You should see the

Re: [time-nuts] Low noise quartz crystal oscillator by Bruce Griffiths

On 10/28/15 4:29 PM, Adrian wrote: That's chapter 6 of his book. http://rubiola.org/indexx-oscillator-noise.html Just scroll down for the phase noise plots. The left hand column of plots contains the essentials. Adrian what would be nice is some similar simple analysis for lower performing

Re: [time-nuts] Leap seconds coming up for debate, yet again

Mark Sims wrote: > http://www.theregister.co.uk/2015/10/29/leap_second_international_comms_conf/ > Interesting take-away... 2012 leap second caused lots of snafus... > 2015 leap second barely noticed. The computer world seems to have > finally payed the leap second the

Re: [time-nuts] The Pendulum Paradigm by Martin Beech, 2014

Yes, but first you need a very stable pendulum clock as pointed out by TVB, a stability better than 0.05ppm for a mechanical clock is a real challenge. On Thu, Oct 29, 2015 at 12:56 PM, Jim Lux wrote: > On 10/28/15

[time-nuts] Looking for Datum/Symmetricom MONITOR.EXE software

Hello Time-Nuts, Looks like the TLI interface on my PRS-50 has died (I just can't get anything through either serial port - 9600,8,N,1), and I need to switch the auxiliary output from its current 5MHz to 10MHz. When I remove the TLI interface I can see status over the rear RS-232 connector at

Re: [time-nuts] Looking for Datum/Symmetricom MONITOR.EXE software

Hi Skip, You might try contacting Symmetricom directly.  That's how I got my copy of monitor3.exe for my PRS-45A.  You can change the baudrate etc on monitor3.exe. Bob From: Skip Withrow To: time-nuts Sent: Thursday, October 29, 2015 9:18

[time-nuts] Wildwood eLoran on air schedule

The Wildwood eLoran Transmitter will be on air for testing purposes from 0900 (EST) on 03 November until 1200 (EST) on 06 November and then again from 0900 (EST) on 09 November until 1500 (EST) on 13 November. Wildwood will be broadcasting as 8970 Master and Secondary. Regards Paul WB8TSL

Re: [time-nuts] Datum TS2100 10MHz frequency drift

Philip Zahariev via time-nuts kirjoitti: Unfortunately I'm not happy with results because 10 MHz output signal after GPS lock (both leds on front "Locked" and "tracking" are "ON") has frequency drift (phase shift) with period around one second plus minus ~18 deg (+-5 ns) compared to other 10

Re: [time-nuts] Historical frequency data of UK grid

Very nice... thank you! Daniel Em 28/10/2015 19:53, Dr. David Kirkby (Kirkby Microwave Ltd) escreveu: Unlike the USA, the UK has just one grid. Someone pointed this out to me, which looks an interesting visual display http://www.gridwatch.templar.co.uk/ but there are links to the raw

[time-nuts] Leap seconds coming up for debate, yet again

http://www.theregister.co.uk/2015/10/29/leap_second_international_comms_conf/ Interesting take-away... 2012 leap second caused lots of snafus... 2015 leap second barely noticed. The computer world seems to have finally payed the leap second the respect that it deserves and now has it under