Re: [neonixie-l] My latest project...

[GastonP]

Well, you would really need two of those in perfect sync at start time to 
do the time-dilation measurement. If you want to implement the second one 
you will need a method to compensate for the communication delay when you 
do the measurement in real time. And a really good back support.
However I can volunteer for the first one if someone provides the 
wristwatch and the plane tickets. And I get to keep the wristwacth as a 
memento :D

On Tuesday, January 14, 2020 at 3:45:34 AM UTC-3, gregebert wrote:
>
> Definitely a must-have if you want to measure your time-dilation on a long 
> airplane flight, or perhaps when climbing a very tall mountain ?
>

-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/6921375e-8987--a8ac-d2be61db58bd%40googlegroups.com.

Re: [neonixie-l] My latest project...

[Bill Notfaded]

4sure!!!

On Mon, Jan 13, 2020, 11:45 PM gregebert  wrote:

> Definitely a must-have if you want to measure your time-dilation on a long
> airplane flight, or perhaps when climbing a very tall mountain ?
>
> --
> You received this message because you are subscribed to a topic in the
> Google Groups "neonixie-l" group.
> To unsubscribe from this topic, visit
> https://groups.google.com/d/topic/neonixie-l/o31sfIZ1PiA/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> neonixie-l+unsubscr...@googlegroups.com.
> To view this discussion on the web, visit
> https://groups.google.com/d/msgid/neonixie-l/36f6d617-5ead-4471-aec9-b15c7b645382%40googlegroups.com
> 
> .
>

-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/CADToqn00Hnk13ak3QfQW%2BO6fvnY%3DjQOzwoX61Gx247BG8AQ_Yg%40mail.gmail.com.

Re: [neonixie-l] My latest project...

[gregebert]

Definitely a must-have if you want to measure your time-dilation on a long 
airplane flight, or perhaps when climbing a very tall mountain ?

-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/36f6d617-5ead-4471-aec9-b15c7b645382%40googlegroups.com.

Re: [neonixie-l] My latest project...

[Bill Notfaded]

Actually even crystal oscillators start to lose time in hours... A rubidium
can holdover for days and a cesium can holdover for more days... None are
perfect.  Cesium 133 resonates between different energy states
9,192,631,770 times each second with almost no variation. So a clock that
ticks to that resonant frequency will be highly accurate. The National
Institute of Technology's most accurate cesium clock, which along with a
similar device in Paris is the most accurate in the world, will neither
gain nor lose a second in 20 million years.
I was sorta joking really.  It's kinda like the cesium wrist watch you seen
that one gregbert?

http://leapsecond.com/pages/atomic-bill/

Bill

On Mon, Jan 13, 2020, 3:48 PM gregebert  wrote:

> It's really a matter of what you want for a reference. A
> Rubidium/Cesium/whatever reference will give you a very stable 10Mhz timing
> reference, but it *wont* give you the official time-of-day. Every so often,
> there are corrections to official world time and if you're using a stable
> timing reference you still have to code those changes into your clock.
>
> When you use GPS or NTP, all of that global time update stuff is handled
> for you, but between updates your time will drift slightly though that
> amount of drift is probably milliseconds or less. It would be cool/amusing
> to monitor the drift in realtime versus a local atomic reference. I believe
> NTP monitors drift and attempts to correct for it and if drift is small
> enough it will periodically skip updates; my RasPi  is logging about 20 NTP
> updates overnight.
>
> I recall some of the temp-controlled quartz-crystal ovens were holding +/-
> 0.1PPM , which is roughly 1 second per 100 days. Whereas an atomic source
> is on the order of 1 second per 30+ *years* .
>
> --
> You received this message because you are subscribed to a topic in the
> Google Groups "neonixie-l" group.
> To unsubscribe from this topic, visit
> https://groups.google.com/d/topic/neonixie-l/o31sfIZ1PiA/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> neonixie-l+unsubscr...@googlegroups.com.
> To view this discussion on the web, visit
> https://groups.google.com/d/msgid/neonixie-l/ad4b61cc-70e7-44b8-917b-0999688e4a60%40googlegroups.com
> 
> .
>

-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/CADToqn09_67uzeoodPnxHh4wL-3KR1DUo-TjM_NShMmtJj6cqQ%40mail.gmail.com.

Re: [neonixie-l] My latest project...

[gregebert]

It's really a matter of what you want for a reference. A 
Rubidium/Cesium/whatever reference will give you a very stable 10Mhz timing 
reference, but it *wont* give you the official time-of-day. Every so often, 
there are corrections to official world time and if you're using a stable 
timing reference you still have to code those changes into your clock.

When you use GPS or NTP, all of that global time update stuff is handled 
for you, but between updates your time will drift slightly though that 
amount of drift is probably milliseconds or less. It would be cool/amusing 
to monitor the drift in realtime versus a local atomic reference. I believe 
NTP monitors drift and attempts to correct for it and if drift is small 
enough it will periodically skip updates; my RasPi  is logging about 20 NTP 
updates overnight.

I recall some of the temp-controlled quartz-crystal ovens were holding +/- 
0.1PPM , which is roughly 1 second per 100 days. Whereas an atomic source 
is on the order of 1 second per 30+ *years* .

-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/ad4b61cc-70e7-44b8-917b-0999688e4a60%40googlegroups.com.

Re: [neonixie-l] My latest project...

[Tom Van Baak]

> Do you think this can feed my Nixie clocks?

Bill, yes, have a look at: http://leapsecond.com/pages/atomic-nixie/

/tvb


-- 
You received this message because you are subscribed to the Google Groups 
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to neonixie-l+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/neonixie-l/5225AA03-AAFA-4178-8C91-E49EA462172A%40LeapSecond.com.