Re: [time-nuts] Smart Phone time display accuracy...?

2017-03-18 Thread Jeremy Nichols
I have that app but don't see an option to display "the offset between NTP time and the device's internal clock." Please guide me. Jeremy On 3/18/2017 9:37 AM, Glen Hoag wrote: On my iPhone, I run an NTP client, Emerald Time, that displays the offset between NTP time and the device's

[time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Mark Sims
Here's some marketing eyewash for the thing... it has a 100 MHz output... http://www.heritek.com.cn/Private/Files/3037bb9d8c45dac855ad.pdf Darn it... I just bought a 5071A. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Bob Camp
Hi Get a bigger bag :) Bob > On Mar 18, 2017, at 4:45 PM, Wojciech Owczarek > wrote: > > I tried lifting it but it wouldn't fit in my bag :( > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Wojciech Owczarek
I tried lifting it but it wouldn't fit in my bag :( ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Smart Phone time display accuracy...?

2017-03-18 Thread Glen Hoag
On my iPhone, I run an NTP client, Emerald Time, that displays the offset between NTP time and the device's internal clock. I'm on T-Mobile US and the offset is typically in the low tens of milliseconds or better. It's certainly accurate enough as a clock where all I'm looking at is one

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Magnus Danielson
Hi, On 03/18/2017 08:25 PM, Poul-Henning Kamp wrote: In message <2254f8a0-9ea7-e0d3-18d7-90918985c...@rubidium.dyndns.org>, Magnus D anielson writes: The A magnet being replaced by the A laser will for the same flow from the cesium oven produce twice as much atoms and thus improve

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Magnus Danielson
Hi Paul, On 03/18/2017 03:32 PM, paul swed wrote: I am in the same frame of mind had the market, so no need to evolve. But also it seems the business segment is so small its unclear that there is a good business case to build them.These days if its not $B little interest. Chuckle. Hp dumped

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Poul-Henning Kamp
In message <2254f8a0-9ea7-e0d3-18d7-90918985c...@rubidium.dyndns.org>, Magnus D anielson writes: >The A magnet being replaced by the A laser will for the same flow from >the cesium oven produce twice as much atoms and thus improve signal to >noise. It will generate more than twice the

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Poul-Henning Kamp
In message <7765b488-bc22-d5af-3f62-d356e4aac...@karlquist.com>, "Richard (Rick ) Karlquist" writes: >NIST-7 has a reversible beam, which cancels out end to end phase >error in the CBT. That works in terms of being a frequency standard, >but not for a clock, because you don't have

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread paul swed
Did take a look at the various papers. The older Osciliquartz document does overlap the new one. But the old one actually supplies more details. Good reads. It is interesting that the major consumable components like laser diodes are all external. So what is the true life of the unit. Pretty

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread paul swed
I am in the same frame of mind had the market, so no need to evolve. But also it seems the business segment is so small its unclear that there is a good business case to build them.These days if its not $B little interest. Chuckle. Hp dumped cesiums and test equipment and then symetricom was

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Magnus Danielson
Rick, On 03/18/2017 05:32 PM, Richard (Rick) Karlquist wrote: On 3/18/2017 3:13 AM, Magnus Danielson wrote: The NIST-7 was a optically pumped cesium beam, and a pre-cursor to the fountain clocks. There should be a bunch of papers on it. I am however somewhat wondering about if we will see

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Richard (Rick) Karlquist
On 3/18/2017 3:13 AM, Magnus Danielson wrote: The NIST-7 was a optically pumped cesium beam, and a pre-cursor to the fountain clocks. There should be a bunch of papers on it. I am however somewhat wondering about if we will see this coming out of Oscilloquartz. We will see. NIST-7 has a

Re: [time-nuts] Smart Phone time display accuracy...?

2017-03-18 Thread John Hawkinson
Chris Albertson wrote on Fri, 17 Mar 2017 at 14:38:17 -0700 in

Re: [time-nuts] Antique precision timing device without

2017-03-18 Thread Bob Camp
Hi > On Mar 17, 2017, at 7:41 PM, Morris Odell wrote: > > HI all, > > Thanks to all those who responded to my post and also for the great pics of > other tuning forks. It's amazing that they were still being used for > electronic purposes as recently as the 1960s.

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Magnus Danielson
The NIST-7 was a optically pumped cesium beam, and a pre-cursor to the fountain clocks. There should be a bunch of papers on it. If you look on the picture from wikipedia: https://en.wikipedia.org/wiki/NIST-7 You can see the optical bench on top of the electronics rack. The modern books go

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Poul-Henning Kamp
In message <45f89398-9302-80dc-3b9d-690802c46...@karlquist.com>, "Richard (Rick) Karlquist" write s: >It is surprising that none of the various makers of the 5071A >ever made an optical version. I wonder what they are thinking >now that someone else has done it. Why would they ? They

Re: [time-nuts] Antique precision timing device without electronics

2017-03-18 Thread Poul-Henning Kamp
In message <20170317220437.4a4ff406...@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes: > >e...@scace.org said: >>Frequencies around 15 Hz were common on early 20th century cables, >> depending on the degree of success in compensating for the inherent >> capacitance on a cable

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Bruce Griffiths
An Early (~1980?) NS/FEI paper on optically pumped cesium beam tubes: http://tf.nist.gov/general/pdf/732.pdf Bruce > > On 18 March 2017 at 17:28 "Richard (Rick) Karlquist" > wrote: > > Len Cutler was all set to build an optically > pumped Cs beam 20 years

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

2017-03-18 Thread Gregory Maxwell
On Sat, Mar 18, 2017 at 2:48 AM, wrote: > Looks like Oscilloquartz is getting ready to sell this commercially! http://www.chronos.co.uk/files/pdfs/itsf/2015/day2/1410_High_performance_optically-pumped_cesium_beam_clock-PBerthoud-Oscilloquartz.pdf Two year old deck with a fair