[rescue] In Realtime: Saving 25, 000 Manuals ??? August 15, 2015
rdarlington at gmail.com
Fri Aug 21 11:04:42 CDT 2015
Yes, we do have discussions on that but ultimately that's probably a
project for the ntp oriented groups.
I'm designing a cape for a beaglebone black around a Furuno gps timing
receiver in order to replace a commercially available ($3000) NTP
appliance. So far I'm out about $100 including the beaglebone. The gps
receiver, brand new, is $35. Ping me off list and I'll give you all the
details you want.
Here's some random stats for a 24 hour period that I bothered to graph:
time-nuts is much more interested in the science and art of characterizing
performance of oscillators, precision time interval measurements,
statistics, and the like. Most of us care about what time it is
(wristwatch time) but that's a minor interest. It's all about squeaking
out the best performance of cesium beams, rubidum clocks, and quartz
oscillators for stability.
On Fri, Aug 21, 2015 at 7:13 AM, Phil Stracchino <phils at caerllewys.net>
> On 08/21/15 00:21, Bob Darlington wrote:
> > This pleases me greatly. Sure, I'm a computer nerd, but I also am into
> > electronics and instrumentation, and in particular old test equipment
> > as Tektronix oscilloscopes, plugin systems, and the like. This is
> > and I'm very thankful to everyone who was able to help and rescue the
> > manuals. I know as the dust settles the long task of dealing with what
> > saved is going to start. I'll continue to follow what Jason is up to,
> > please let me know where money is needed, if I can help in any way, etc.
> > There are multiple communities that rely on scanned Tek and HP manuals
> > as the time-nuts that I've been involved with for many years now. There
> > plenty of discussion on that list too about this and they have expressed
> > gratitude as well.
> That sounds suspiciously like a group of people who might be able to
> advise or assist on using a USB GPS receiver as a stratum 0 time source.
> (I know of exactly one directly-USB-connected GPS receiver that emits a
> PPS signal. Unfortunately it's all but unobtainium in quantities of
> less than a hundred at a time.)
> I tried it once using a MS DeLorme GPS receiver that used a USB-serial
> adapter chip, and it worked beautifully with no detectable jitter except
> that once loaded and started, the driver for its USB-serial chip could
> never be stopped or unloaded even if I physically unplugged the
> receiver, which made clean reboots impossible.
> Phil Stracchino
> Babylon Communications
> phils at caerllewys.net
> phil at co.ordinate.org
> Landline: 603.293.8485
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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