[time-nuts] Fw: Optical transfer of time and frequency

On Sunday, 1 May 2016 10:52 AM, Bruce Griffiths wrote: White Rabbit is open hardware, you are free to build it yourself should you want to do so. All the relevant VHDL etc is available.There will also be suitable TDC designs available on the CERN site.You

Re: [time-nuts] Rpair of an 8662 HP Generator

The problem is solved, A German surplus dealer has/had bunch of these generator, calibrated and with guarantee for less then $ 3000. And in good shape. Who wants the old one .. no cost , power supply in trouble , Ulrich In a message dated 4/15/2016 10:01:56 P.M. Eastern Daylight Time,

Re: [time-nuts] Optical transfer of time and frequency

I found only preliminary data about these transceivers. I was meaning for a <2000€ overall solution, does a White Rabbit implementation fill this requisite ( I couldn't find much information about its costs)? Also consider that nodes could be more than three also. Ilia. Il 30/04/2016

[time-nuts] Article on leapseconds

Ars Technica just published a piece on leapseconds. There is some interesting info on what makes the earth a poor clock and our abilities to measure it (want to smooth it out a bit... cut down all the trees).

Re: [time-nuts] Kinemetrics/Truetime WWVB model 60-dc?

Rob, Take a look at http://www.maxmcarter.com/rubidium/2012_mod/#599 Might be a possible mod. Bob darby -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Rob Seaman Sent: Friday, April 29, 2016 7:13 PM To: Discussion of precise time and frequency

Re: [time-nuts] Optical transfer of time and frequency

There are synchronous free space optical gigabit ethernet links available, it shouldn't take too much to modify one for White Rabbit. Bruce On Saturday, 30 April 2016 10:13 PM, Magnus Danielson wrote: Hi, On 04/29/2016 11:45 PM, Michael Wouters wrote: >

Re: [time-nuts] Optical transfer of time and frequency

On Sat, Apr 30, 2016 at 8:06 AM, Bruce Griffiths wrote: > So far I haven't found an existing free space optical implementation of White > Rabbit. There are two groups working on that subject that I know of: Jean-Pierre Aubry [1] and his colleagues in EPFL (Neuchâtel

Re: [time-nuts] Optical transfer of time and frequency

The free-space implementation of White Rabbit remains to be done. If you can modulate optical GE over your optical links, then it should work out fairly well. Actually, if you get that working, I'm sure they would enjoy seeing a paper on that in EFTF. Cheers, Magnus On 04/30/2016 08:06 AM,

Re: [time-nuts] Optical transfer of time and frequency

Hi, On 04/29/2016 11:45 PM, Michael Wouters wrote: On Sat, Apr 30, 2016 at 6:14 AM, Magnus Danielson wrote: Well, giving the conditions mentioned, doing ranging codes such as those used by GPS is very easy and cheap. Doing this in bidirectional isn't too hard.

Re: [time-nuts] Optical transfer of time and frequency

On Sat, Apr 30, 2016 at 6:14 AM, Magnus Danielson wrote: > Well, giving the conditions mentioned, doing ranging codes such as those > used by GPS is very easy and cheap. Doing this in bidirectional isn't too > hard. Doing a suitably high chip-rate should cost very

Re: [time-nuts] Optical transfer of time and frequency

White Rabbit would be good in that a suitable TDC design with 1ns resolution already exists for White Rabbit. This TDC is used in the Tunka valley (near lake Baikal) Siberian Cherenkov telescope array. Note this TDC uses the SERDES receiver in the FPGA to implement a serial to parallel