[time-nuts] Beaglebone NTP server

[Bob Bownes]

If there is always a system running, why go with the bbb? I use the file server in the basement fed with 1pps to the non USB serial port from a TBolt in my office. 

You do have a file server in the basement don't you? :)

I suppose it would be an interesting experiment to feed an NTP server with several PPS signals (either simultaneous or offset) to see how it handles it. Or to set up an NTP chorus fed from multiple PPS sources or even a single PPS source to see how they average out. Maybe over the holidays. I really should finish up running the coax for a shared GPS antenna to the basement.

Bob

PS: As to the buy a second BBB/RPi question, I've taken to buying what I think will be key spare parts for projects and stocking them. Each project gets a shoebox sized storage bin on the shelves in the basement. One part of the shelves is completed projects, the other is in process. It has the added side benefit of telling me when I have too many unfinished projects. :)




> On Dec 11, 2014, at 11:45, "Tom Holmes" <tholmes at woh.rr.com> wrote:
> 
> Brian... 
> 
> "Look, I used to leave WWV running all the time on a receiver. That
> background DOOOO DOOOO DOOOO was very reassuring as I moved through the
> house watching the sweep second hands ticking in time with WWV."
> 
> Based on personal experience, this strongly suggests that you weren't married at the time :-).
> 
> Tom Holmes, N8ZM
> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Brian Lloyd
> Sent: Thursday, December 11, 2014 11:21 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Beaglebone NTP server
> 
>> On Thu, Dec 11, 2014 at 10:03 AM, Paul <tic-toc at bodosom.net> wrote:
>> 
>> On Thu, Dec 11, 2014 at 10:27 AM, Dan Drown <dan-timenuts at drown.org>
>> wrote:
>> 
>>> Is this better or worse than other NTP server platforms?  I haven't
>> tested
>>> them, so I have no idea.
>> 
>> 
>> Tharp says his appliance
>> 
>> "can sustain thousands of queries per second. Even under high throughput
>> timekeeping operations are never disrupted or perturbed."
>> 
>> But enough of that.
>> 
>> From the time-nut perspective what's the interest in high resolution NTP?
>> I mean beyond the "can I do this?" appeal.
> 
> We are all time nuts to one degree or another or we wouldn't be here. I
> personally want all the clocks in my house, including all the computers (I
> have about 10 running at any given moment here), to have time resolution
> better than my ability to perceive errors. (To my eye that is about 100ms
> for clocks with a sweep second hand.) and in the 1ms-or-better range for
> the computers. I want to know that, when two things get time-stamped on
> different machines, I can tell which happened first from the point of view
> of a DBMS dealing with concurrency issues.
> 
> So a stratum 1 server in my house that is independent of my external
> internet connectivity seems desirable.
> 
> Look, I used to leave WWV running all the time on a receiver. That
> background DOOOO DOOOO DOOOO was very reassuring as I moved through the
> house watching the sweep second hands ticking in time with WWV. Time to
> move forward in true time-nut fashion.
> 
> -- 
> Brian Lloyd
> Lloyd Aviation
> 706 Flightline Drive
> Spring Branch, TX 78070
> brian at lloyd.aero
> +1.210.802-8FLY (1.210.802-8359)
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