Re: [time-nuts] question Alan deviation measured with Timelab and counters

> - Can I use Frequency difference mode from Timelab to monitor time intervals ? > If no is there a way to use the time interval measurement from the counter > with > Timelab to plot ADEV ? If you feed in frequency samples, it will convert them to phase-difference samples internally, so the prog

Re: [time-nuts] question Alan deviation measured with Timelab and counters

Hi Magnus, For some reason I've missed this message and the one from Jim until now ! This answers many of the questions I had. For my defense, I've 3000 messages since the last 3 months on the list !!! ah, yes, I'd like to get even better than 1E-12. 1E-14 would be perfect but my best standa

[time-nuts] Javascript "Countdown to the Leapsecond" Nixie Clock

Hello All, A few days ago, I mentioned that I had uncovered a 1 hour error in Tom's (very cute) Nixie Countdown clock, by calculating the "delta" using the MJD (Modified Julian Date). Tom wrote: > So at one level we're all set. But the question still is, why did or does the > code not work right

Re: [time-nuts] Current state of optical clocks and the definition of the second

I think the key to this concept is an optical comb filter. Archita Hati of the Phase Noise measurement Group at NIST has been researching ultra low phase noise 5MHz references using an optical standard and comb filter as well as extensive RF components to down converting to the desired frequen

Re: [time-nuts] question Alan deviation measured with Timelab and counters

Hi there, I'm still working on the ADEV measurement and here is what I've experimented today and few questions which are arising, that for sure have probably an easy answer... After having measured my 10 MHz GPSDOs with 1Hz and 0.01Hz resolution with HP8342A and Phillips PM6654C, I've seen the

Re: [time-nuts] Current state of optical clocks and the definition of the second

THe stability /accuracy of lasers is entirely dependent on the cavity length. Materials used are usually invar or silica, so you are no better off than with a quartz crystals. They are just a resonant cavity. cheers, Neville Michie ___ time-nuts mailin

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Tue, 13 Jan 2015 17:46:01 + "Dr. David Kirkby (Kirkby Microwave Ltd)" wrote: > I had a brief read. Equation 1 made me wonder what could be achieved > with a cheap HeNe laser. It should be fairly easy to mix a couple of > HeNe lasers on a photodiode and look at the difference frequency > b

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Tue, 13 Jan 2015 19:37:05 +0100 Attila Kinali wrote: > If you use a standard laser diode, these have a linewidth of > around 20-100MHz. If you provide them the slightest feedback, > they go down to 1MHz easily (ie just by adding some window glass > infront of the laser, that reflects a tiny bi

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Tue, Jan 13, 2015 at 5:46 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > I had a brief read. Equation 1 made me wonder what could be achieved > with a cheap HeNe laser. It should be fairly easy to mix a couple of See Sams Laser Faq section on stabalized HeNe Lasers: http://www.repairfaq.

Re: [time-nuts] Z3801A Oven Controller Schematic Needed

There are some schematics on Didier’s site . If they are not sufficient and none are forthcoming, I have one powered down which I could photo if you think that would help. > Le 13 janv. 2015 à 18:21, Craig Anderson a écrit : > > I had a recent meltdown (flameout

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Tue, 13 Jan 2015 17:46:01 + "Dr. David Kirkby (Kirkby Microwave Ltd)" wrote: > Of course I'm not suggesting a HeNe would provide the stability of > cutting edge research laser optical clock, but they are easily within > the budget of a hobbyist and could be a bit of fun to try to measure

Re: [time-nuts] Current state of optical clocks and the definition of the second

On 12 January 2015 at 12:34, Attila Kinali wrote: > Hi, > > I just stumbled over this [1] nice article by Fritz Riehle that might be > of interest to others as well. > > Attila Kinali > > [1] "Towards a Re-definition of the Second Based on Optical Atomic Clocks", > by Fritz

[time-nuts] Z3801A Oven Controller Schematic Needed

I had a recent meltdown (flameout really) of a 10ufd 35 volt Tantalum on the bottom side of the main oven controller board near J-16, the 9 pin connector coming from the power supply board. Does anyone have the section of the schematic that covers that area. I did get the component values of

Re: [time-nuts] Current state of optical clocks and the definition of the second

On 1/13/15 2:41 AM, Attila Kinali wrote: On Mon, 12 Jan 2015 20:09:45 + Gregory Maxwell wrote: One exception here is space qualified oscillators. For those you go to the JPL and ask them to help you. Actually, you want to go to Applied Physics Labs (APL).. they're the USO folks. At JP

Re: [time-nuts] FOSDEM 2015 has a time-track

On Tue, 13 Jan 2015 01:57:56 -0800 "Tom Van Baak" wrote: > I was told some of the time slots of https://fosdem.org/2015/schedule/track/ > time/ > might be tentative Well, it's FOSDEM. It's not a professionally organised conference. And as presentations often take longer than their time slot,

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Mon, 12 Jan 2015 20:09:45 + Gregory Maxwell wrote: > On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali wrote: > > I just stumbled over this [1] nice article by Fritz Riehle that might be > > of interest to others as well. > > I've seen less discussion of non-atomic stable optical oscillato

Re: [time-nuts] FOSDEM 2015 has a time-track

Hi Attila, I was told some of the time slots of https://fosdem.org/2015/schedule/track/time/ might be tentative but we'll all get together after the last talk, whenever it is. So far everyone I've heard from has the evening open. Time nuts -- if you're within a couple hundred km of Brussels it

Re: [time-nuts] FOSDEM 2015 has a time-track

On Tue, Jan 13, 2015 at 9:04 AM, Attila Kinali wrote: > I'll be at FOSDEM, Friday to Monday. Do any of the present time-nuts care > for a meetup (like some drinks or dinner)? That'd be great! I will be at FOSDEM but unfortunately I will miss the Time track because I am organizing the Electronic D

Re: [time-nuts] FOSDEM 2015 has a time-track

Moin moin, On Wed, 07 Jan 2015 08:06:20 + Poul-Henning Kamp wrote: > FOSDEM is an Open-Source gathering once a year in Bruxelles, and > this year there is a track dedicated to time: > > https://fosdem.org/2015/schedule/track/time/ > > Those of you of an european persuassion may find

Re: [time-nuts] June 30 2015 leap second

d0ct0r wrote: Today, I did the check the settings for my BC637 card. I was surprised that its overwrite my manual setting for the Leap Event by following information: Time Settings: Mode : GPS Time Format: Binary Year

Re: [time-nuts] Arduino GPIB

On 1/12/15 1:00 PM, Tom Van Baak wrote: Yes, you can get an Arduino R3 on eBay for <$4 with shipping... The GPIB connector will cost you more! Didier KO4BB A sandwich of two PCB is about the same thickness as the center plug of a GPIB male connector. So layout 2x12 pads to match the pins and

Re: [time-nuts] Current state of optical clocks and the definition of the second

On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali wrote: > I just stumbled over this [1] nice article by Fritz Riehle that might be > of interest to others as well. I've seen less discussion of non-atomic stable optical oscillators. Most (all?) of these optical atomic standards are passive atomic c

Re: [time-nuts] Arduino GPIB

Marvelous. Is there any reason not to adapt this to an Arduino with a network shield? Don Joseph Gray > I thought everyone here would find this of interest. I stumbled across it a > few days ago on the 'net. It is a Prologix GPIB-USB compatible made with an > Arduino Uno. > > http://egirland.blogsp