[time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Mike Cook michael.cook at sfr.fr
Thu Oct 19 08:08:47 UTC 2017

On the home brew side there are GPS receivers (Ublox Lea 6T and Lea M8T) that will time tag incoming signals to sub usec resolution . You of course need a PC/micro to configure and read the data.
Also, if you are prepared to have a Beaglebone Black in your box you can use one or both of the two Programmable Real-time Units, modules in the SOC that are completely independant of the CPU running linux, to also get sub usec resolution. Programming required. 

> Le 18 oct. 2017 à 17:26, Attila Kinali <attila at kinali.ch> a écrit :
> On Wed, 18 Oct 2017 08:47:58 -0600
> Rob Seaman <seaman at noao.edu> wrote:
>> I’m at the annual planetary sciences meeting (in Provo this year) and several 
>> groups have expressed interest in duplicating our setup (details of FO 
>> converters, Schmitt triggers, etc, omitted) in a “cheap black box” to quote
>> one fellow. Lots of people contribute productively to NEO observations, 
>> including amateurs and small teams with little funding. Improving their 
>> timekeeping would help keep rocks from falling on you and your family.
> What is this black box supposed to do? Just provide a PPS? IRIG-B?
> Or does it need to have time-stamping capabilities? If so, how many
> channels?
> What are your time precision/accuracy requirements?
> What how cheap is "cheap"? What is the volume?
> 				Attila Kinali
> -- 
> It is upon moral qualities that a society is ultimately founded. All 
> the prosperity and technological sophistication in the world is of no 
> use without that foundation.
>                 -- Miss Matheson, The Diamond Age, Neil Stephenson
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