d. Note that I didn't
> touch gpsclientd...
>
> Leigh/WA5ZNU
>
> On 08/01/2017 09:37 AM, Ralph Smith wrote:
>> Thanks for doing this, I was just about to dive into this. I've been
>> neck deep in some other things recently and just became aware of this
>> iss
Thanks for doing this, I was just about to dive into this. I've been neck deep
in some other things recently and just became aware of this issue.
Could you check the source tarball? I just downloaded it and it appears to be
the unmodified version of my code from 2010.
Ralph
AB4RS
Sent from
L
> pointed me to:
> Original code written for BSD:
> http://ralphsmith.org/~ralph/thunderbolt.tar.gz
>
> Patches for linux and info by Leigh Klotz (WA5ZNU):
> http://wa5znu.org/2011/08/tbolt/
>
> The original announcement for the BSD version was almost 6 years ago by
> R
I wrote a program called tboltd that does just that. You have the option
of having it write the time to shared memory and using NTP's SHM driver.
You can get it at http://topoatlas.com/tboltd/tboltd.gz. It compiles on
FreeBSD, not sure about Linux. tboltd allows LH to connect while it does
its
I drive one of my Self Winding Clock Company/Western Union clocks using the NTP
server I built using a Trimble Thunderbolt and a Soekris Net4501. I use a GPIO
line to drive a simple transistor switch using the same 3 volt battery that I
also use do power the winder. The pulse from the GPIO pin
On Jun 6, 2013, at 1:59 AM, Chris Albertson albertson.ch...@gmail.com wrote:
Yes, that is exactly what I meant by remove the temperature issue that
means using a clock derived from a laboratory standard like GPS disciplined
OCXO or a rubidium oscillator. Once you do this the next bottle next
On Jun 7, 2013, at 12:19 AM, Chris Albertson albertson.ch...@gmail.com wrote:
If you look at PHK's code in FreeBSD this is what is done. The PPS signal
gates the timer, so no interrupt is involved in the time stamp precision.
But yes, it would be interesting to do something on a FPGA.
On Mon, May 27, 2013 10:56 am, Miguel Barbosa Gonçalves wrote:
[...]
On 27 May 2013 14:56, Bob Camp li...@rtty.us wrote:
[...]
Also correct, but a bit of a joke answer:
Raspberry PI driving your television set. Alternatively make the Pi
feed
control signals to a hacked normal clock.
Good
Spam detection software, running on the system sawtooth.ralphsmith.org, has
identified this incoming email as possible spam. The original message
has been attached to this so you can view it (if it isn't spam) or label
similar future email. If you have any questions, see
The administrator of
It seems my mail server was a little overzealous in declaring a message
spam, for which I apologize, and will try a resend.
On Tue, February 15, 2011 7:40 am, Brendan Minish wrote:
I guess what I am wondering, considering I already have a very low
noise, stable, battery backed 12V (13.8V
If you are rolling your own I would advise a Soekris net4501 (US $173 new) over
any netbook for several reasons: cheaper, more rugged, better solution overall.
It all comes down to requirements, budget, and who the user is (which drives
the first two). If I were doing a system for myself, it's
OK, after dropping the amount of coin on the mount, scope, and camera, (my
guess in the neighborhood of $40,000 US) a few hundred bucks for a timing
solution shouldn't be too bad. Would an external NTP box, perhaps a Soekris
Net4501 driven by a Thunderbolt or another GPS receiver with PPS work?
On Sep 11, 2010, at 12:13 PM, Magnus Danielson wrote:
On 09/11/2010 05:29 PM, jimlux wrote:
If it's far enough in the future.. Hg ion traps have a lot of
potential.. smaller, lower power, etc. than Cs
Commercial availability is somewhat limited.
that's for sure.. I think all the Hg ion
On Sep 10, 2010, at 7:50 AM, J. L. Trantham wrote:
Loran was used as an area navigation method in aviation for many years. It
was available nation wide with a number of chains. I had assumed that the
area of interest was the Rocky's but if the Appalachians, even better.
The site currently
On Fri, September 10, 2010 11:43 am, Mark Spencer wrote:
The application in question seems to be concerned with the realitive time
difference between sites as opposed to absolute accuracy so depending on
how
close they were together the propgation variances in a loran type solution
may
not
OK, stop me if this is really stupid. The initial site is in Colorado.
Would it be possible to use WWV? In particular:
1) Lock a reference to the carrier of one of the WWV signals
2) Generate PPS off of WWV-locked reference
3) Periodically send difference of GPSDO PPS and WWV-locked PPS home,
On Sep 10, 2010, at 7:44 PM, J. L. Trantham, M. D. wrote:
I guess I am thinking about this from a user perspective rather than an
engineering design and implementation perspective. If the requirement is
aircraft separation, LORAN should be adequate for that, if it was still up.
You would
We have a requirement for approximately ten radio sites to be synchronized
to within 30 ns of each other. Ordinarily you could throw in an
appropriate GPSDO and be done with it. However, we also have the
reqirement to be able to operate independent of GPS for up to six days. If
we were able to
, Sep 9, 2010 at 9:37 AM, Ralph Smith ra...@ralphsmith.org wrote:
We have a requirement for approximately ten radio sites to be
synchronized
to within 30 ns of each other. Ordinarily you could throw in an
appropriate GPSDO and be done with it. However, we also have the
reqirement to be able
The network is spread over about 250-300 US miles.
Ralph
On Thu, September 9, 2010 12:01 pm, Didier Juges wrote:
How widely spread is your network?
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Ralph Smith ra
On Thu, September 9, 2010 1:10 pm, Matthew Kaufman wrote:
On 9/9/2010 8:37 AM, Ralph Smith wrote:
We have a requirement for approximately ten radio sites to be
synchronized
to within 30 ns of each other.
30 ns seems a little closer than most radio site applications need...
what drives
On Thu, September 9, 2010 1:55 pm, Matthew Kaufman wrote:
On 9/9/2010 10:42 AM, Ralph Smith wrote:
On Thu, September 9, 2010 1:10 pm, Matthew Kaufman wrote:
On 9/9/2010 8:37 AM, Ralph Smith wrote:
We have a requirement for approximately ten radio sites to be
synchronized
to within 30 ns
1e-11 only buys you 3000 seconds of drift before blowing the 30 ns budget.
Without going to cesium we will most likely need some form of mutually
visible synchronization.
Ralph
On Thu, September 9, 2010 2:01 pm, Jason Rabel wrote:
What about Symmetricom XPRO Rubidium? It says on the data sheet
On Thu, September 9, 2010 3:17 pm, John Anderson wrote:
Hmmm...I design such timing systems for Moto data radios, and 30nS sync is
going to be very hard to achieve in reality. Over a few hundred miles
you're going to have OTA time of flight issues, temperature dependencies,
etc. Over the
On Sep 9, 2010, at 9:27 PM, Bob Camp wrote:
Hi
If 30 ns is the system goal, then you have a lot more to budget for than
simple clock error. You could easily be below 10 ns for just the clock
portion of the budget. I suspect that multiple 5071's and a maser or two at
each site will be
On Sep 9, 2010, at 8:01 PM, Rick Karlquist wrote:
I would like to point out that the environmental sensitivities of
the 5071A are unmeasureable, and the measurement threshold is
far below 5.8E-14. I would estimate that the 5071A (and ONLY the 5071A
among commercial clocks) could get the job
We're diverting from time-nuttery a bit here, but I think this is still of
interest to a large part of the group.
On May 31, 2010, at 6:00 AM, Hal Murray wrote:
ra...@ralphsmith.org said:
The Vienna (Virginia) Wireless Society has had several balloon launches. Our
last, on May 1, 2010 reached
The Vienna (Virginia) Wireless Society has had several balloon launches. Our
last, on May 1, 2010 reached 117,877 ft. We use a Garmin GPS-18, which works at
these altitudes. Information on our flights can be found at
http://www.viennawireless.org/balloon/missions/, and some pictures from the
On Apr 22, 2010, at 3:03 AM, Hal Murray wrote:
Has anyone successfully used a Thunderbolt GPS with a 4501 Netclock based
on the design that John Ackermann describes on his web page.
I assume you are talking about:
http://www.febo.com/pages/soekris/
Calling it a Netclock confuses
On Mon, April 5, 2010 1:18 pm, Mark Sims wrote:
Just use everybody's favorite GPSDO, the Thunderbolt. While it is being
disciplined by GPS, it is learning how the oscillator tends to age with
time and drift with temperature. If GPS goes away, it will still
discipline the oscillator in an
Naval Jelly, sold under numerous brand names. Phosphoric acid is also available
in flooring departments of the big home improvement stores, used for removing
grout haze from ceramic tile.
Ralph
On Mar 21, 2010, at 5:23 PM, Robert Atkinson wrote:
There is a common use for Phosphoric acid.
On Tue, February 2, 2010 12:47 pm, Bob Camp wrote:
Hi
Sounds *very* useful.
Which version(s) of FreeBSD have you tried it on?
8.0-STABLE, but it should be good for earlier versions.
Ralph (AB4RS)
___
time-nuts mailing list -- time-nuts@febo.com
On Tue, February 2, 2010 12:58 pm, Bob Camp wrote:
Hi
I'm running 8 on most of my stuff now, so that should not be an issue. If
you had come back with 6.1 that might have been reason to stop and think a
bit.
Does the program take care of all the serial line setup stuff, or are
there
links
On Tue, February 2, 2010 12:53 pm, Ralph Smith wrote:
On Tue, February 2, 2010 12:47 pm, Bob Camp wrote:
Hi
Sounds *very* useful.
Which version(s) of FreeBSD have you tried it on?
8.0-STABLE, but it should be good for earlier versions.
It should also port to Linux easily with minimal
Ken, at Ken's Clock clinic http://www.kensclockclinic.com/ has a good deal of
information about Self-Winding Clock Company clocks, as does our own Brooke
Clarke http://www.prc68.com/I/SWCC.shtml.
I have two of these beasts, powered by a replica #6 battery from Ken's Clock
Clinic, that contains
You can make a lighter, stronger, more rigid tabletop using torsion box
construction. Use 1/2 plywood for the top and bottom. Use 1x1 strips of a
hardwood such as poplar to crate a lattice spaced at 6 inch intervals in
between, glued along the lengths of the lattice. I use brads during
I have a Goofy (Disney) watch, where the hands run backwards. This
was actually not uncommon in barber shop clocks, when looked at in the
mirror they are correct.
Ralph
On Oct 8, 2009, at 3:07 AM, d.sei...@comcast.net wrote:
I'm not in AU (left coast US), but I've got a clock on my office
On Jun 15, 2009, at 9:07 AM, Dave Baxter wrote:
Is this good value, and a trusted seller?
I know nothing about the seller, but the price (US $159) looks
reasonable, considering the inclusion of the antenna and power supply.
My intended main application, is to drive a local NTP server
I got this working, and the FreeBSD port with the Thunderbolt diffs is
at http://ralphsmith.org/~ralph/soekris-ntp/gpsd.tar.gz. I also
used the ntp-devel port.
Ralph
On May 1, 2009, at 12:01 AM, John Murphy wrote:
Thanks for all the replies.
Hal Murray wrote:
The configure step takes
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
Ralph Smith
ra...@ralphsmith.org
___
time-nuts mailing list -- time-nuts@febo.com
I have two Western Union/Self-Winding Clock Company Clocks. Some
background info:
http://www.kensclockclinic.com/pdf/Model%201900S%20White%20Paper.pdf
http://www.prc68.com/I/SWCC.shtml (Brooke Clarke's site, a member of
this list).
I synchronize mine using my NTP server built from a Soekris
I was watching the leap second on the NMEA output of my Garmin GPS18,
displaying the RNC and GGA sentences. The GGA sentences repeated
235959, but the RMC sentence repeated 00.
$GPRMC,235958,A,3855.4967,N,07723.0144,W,000.0,013.3,311208,010.5,W*7D
42 matches
Mail list logo
