It took a couple of days just to get FreeBSD V8.0 installed correctly in
the first place. One false move (hair trigger enter key) and it's
start over time. (OK, so there are probably ways to backtrack, but
like many things, it's just not documented.)
Agreed. I experimented using a VMware
ntpq -p
remote refid st t when poll reach delay
offset jitter
==
*ntpgmtaceb .1PPS. 1 u 20 64 3770.144
-0.373 0.863
So it's seems to be really better, isn't it?
If that
In article 82i5hhfek...@mid.individual.net, sn...@lordynet.org says...
G8KBV wrote:
In article 82f3qcfg1...@mid.individual.net, sn...@lordynet.org says...
Hi
Latest experiment is to attempt to make a backup PPS source and
I've now made a start with a watch xtal oscillator and divider
In article hq12sg$db...@news.eternal-september.org, david-
tay...@blueyonder.co.uk.invalid says...
It took a couple of days just to get FreeBSD V8.0 installed correctly in
the first place. One false move (hair trigger enter key) and it's
start over time. (OK, so there are probably ways
In article hq07jn$3s...@news.eternal-september.org,
da...@ex.djwhome.demon.invalid says...
lhommedumatch wrote:
It's connected on the lan board of our vessel.
If you want to improve the accuracy, you need to fix your LAN; it is
giving round trip times that are on the poor side of
On 13 avr, 00:44, David Lord sn...@lordynet.org wrote:
lhommedumatch wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is synchronised with a gps at
the beginning of a cruise.
The drift of this clock is 1ms each day.
It's connected on the lan board of
On 13 avr, 00:48, unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is synchronised with a gps at
the beginning of a cruise.
Why not put a Garmin GPS 18 on board
In article 82i36jf3r...@mid.individual.net, sn...@lordynet.org says...
David Lord wrote:
Hi
Latest experiment is to attempt to make a backup PPS source and
I've now made a start with a watch xtal oscillator and divider
that can be synchronised by a PPS source when present (except
Why bother with varicaps and pots when a DS3231 chip will probably do
what you want
straight out of the box? Or are you thinking that you might have to
trim out a
constant frequency offset?
Paul
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In article slrnhs78pu.kb3.un...@wormhole.physics.ubc.ca,
un...@wormhole.physics.ubc.ca says...
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is synchronised with a gps at
the beginning of a cruise.
On 13 avr, 08:42, David J Taylor david-
tay...@blueyonder.co.uk.invalid wrote:
ntpq -p
remote refid st t when poll reach delay
offset jitter
==
*ntpgmtaceb .1PPS. 1 u 20
Dave Baxter wrote:
In article 82i36jf3r...@mid.individual.net, sn...@lordynet.org says...
David Lord wrote:
Hi
Latest experiment is to attempt to make a backup PPS source and
I've now made a start with a watch xtal oscillator and divider
that can be synchronised by a PPS source when present
Dave Baxter wrote:
Can someone tell Demon about that, I regularly see round trip delays to
Demon ceased to be a technical users' ISP many years ago.
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Dave Baxter wrote:
In article hq07jn$3s...@news.eternal-september.org,
da...@ex.djwhome.demon.invalid says...
lhommedumatch wrote:
It's connected on the lan board of our vessel.
If you want to improve the accuracy, you need to fix your LAN; it is
giving round trip times that are on the poor
lhommedumatch wrote:
On 13 avr, 00:44, David Lord sn...@lordynet.org wrote:
lhommedumatch wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is synchronised with a gps at
the beginning of a cruise.
The drift of this clock is 1ms each day.
It's connected on the
Dave Baxter s...@goes.nowhere.com wrote in message []
It's the documentation for all this I have trouble with. It's either
next to nothing, or you get links to several generic manual pages or
how to sites, that all say slightly different things. Most confusing
and frustrating when you havent
pc wrote:
Why bother with varicaps and pots when a DS3231 chip will probably do
what you want
straight out of the box? Or are you thinking that you might have to
trim out a
constant frequency offset?
Unfortunately these aren't available from my regular supplier.
From Farnell, Unit Price:
After one night, the delay is 29.626
remote refid st t when poll reach delay
offset jitter
==
*ntpgmtaceb .1PPS. 1 u 406 1024 377 29.626
0.867 1.231
if I put the line:
server
I have better results with:
tos mindist 0.04
ntpq -p
remote refid st t when poll reach delay
offset jitter
==
*ntpgmtaceb .1PPS. 1 u 96 128 3770.140
-0.600 0.340
Thanks for
lhommedumatch wrote:
I have better results with:
tos mindist 0.04
ntpq -p
remote refid st t when poll reach delay
offset jitter
==
*ntpgmtaceb .1PPS. 1 u 96 128 3770.140
On 2010-04-13, Dave Baxter s...@goes.nowhere.com wrote:
In article slrnhs78pu.kb3.un...@wormhole.physics.ubc.ca,
un...@wormhole.physics.ubc.ca says...
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is
On 2010-04-13, lhommedumatch ludocl...@yahoo.com wrote:
On 13 avr, 00:48, unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock that is synchronised with a gps at
the
unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-13, lhommedumatch ludocl...@yahoo.com wrote:
On 13 avr, 00:48, unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic vessel
ntpgmtaceb is our reference clock
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
It took a couple of days just to get FreeBSD V8.0 installed correctly in
the first place. One false move (hair trigger enter key) and it's
start over time. (OK, so there are probably ways to backtrack, but
like many things, it's
On 2010-04-13, Rob nom...@example.com wrote:
unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-13, lhommedumatch ludocl...@yahoo.com wrote:
On 13 avr, 00:48, unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a oceanographic
unruh wrote:
On 2010-04-13, Rob nom...@example.com wrote:
unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-13, lhommedumatch ludocl...@yahoo.com wrote:
On 13 avr, 00:48, unruh un...@wormhole.physics.ubc.ca wrote:
On 2010-04-12, lhommedumatch ludocl...@yahoo.com wrote:
I'm working on a
unruh un...@wormhole.physics.ubc.ca wrote:
Unless oceanographic vessel is a euphamism for something that
spends much of it's time out of sight of any satellites!
But in dock it is surely not out of sight.
Depends on the dock - if it is a submarine pen then while the dock
may not be out of
Rob nom...@example.com wrote in message []
It probably uses Emacs-style key bindings. That can be very frustrated
for users that are not familiar with Emacs. I remember trying to
install
some Linux distribution, I think it was debian, and giving up after
a while for the same reason.
There is
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
Rob nom...@example.com wrote in message []
It probably uses Emacs-style key bindings. That can be very frustrated
for users that are not familiar with Emacs. I remember trying to
install
some Linux distribution, I think it was
unruh un...@wormhole.physics.ubc.ca wrote:
That may be what he wants, but it is not what he asked for. He stated
that he was using an external source as his ntp server, and wanted his
machine to be within a ms of it. That is a job admirably suited to a GPS
receiver. He then stated that this
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
Rob nom...@example.com wrote in message
[]
Ok, that is good.
When you get an openSUSE 11.2 DVD you can install a system and configure
NTP on it using only the GUI, no need to edit any files.
.. what, even if I want to add a GPS
On 2010-04-13, Rob nom...@example.com wrote:
unruh un...@wormhole.physics.ubc.ca wrote:
That may be what he wants, but it is not what he asked for. He stated
that he was using an external source as his ntp server, and wanted his
machine to be within a ms of it. That is a job admirably suited
Rob nom...@example.com wrote in message
news:slrnhs9eho.n5.nom...@xs8.xs4all.nl...
[]
Yes, you can add a PPS clock to the NTP configuration via the GUI.
Very impressive!
When you don't have a DVD, you can use a boot cd and install from the
network, or you can boot from the network when you
unruh wrote:
install a gps. This is almost certainly the simplest. The next is to
figure out why his network connection is so flakey. If as has been
implied it is daemon.com who is providing attrocious adsl service, then
demon.co.uk was a red herring introduced by another poster. As I
unruh un...@wormhole.physics.ubc.ca wrote:
Of course. That is the thing about solutions. You provide extra
information or hardware that is needed to impliment the solution. Now if
you have a better one, I am sure he would welcome it. But I have not
seen it.
In his position, I would
David Woolley wrote:
unruh wrote:
install a gps. This is almost certainly the simplest. The next is to
figure out why his network connection is so flakey. If as has been
implied it is daemon.com who is providing attrocious adsl service, then
demon.co.uk was a red herring introduced by
If I restart the ntpd service the time is updated to the correct time:
/sbin/service ntpd restart
If I run the command below the time is updated to the correct time:
ntpdate -u time-nw.nist.gov
If I don't do any of the above my time is never updated and the server becomes
hours behind.
How or
Hi all again.
I'm still trying to follow the instructions at:-
http://blog.doylenet.net/?p=145
As earlier, so far so good (if after several tries, eventualy getting
FreeBSD loaded and running) I'm at the stage of enabling PPS support in
the kernel.
But
After successfully adding 'options
On 4/13/10 1:40 PM, G8KBV wrote:
Hi all again.
I'm still trying to follow the instructions at:-
http://blog.doylenet.net/?p=145
As earlier, so far so good (if after several tries, eventualy getting
FreeBSD loaded and running) I'm at the stage of enabling PPS support in
the kernel.
But
On Apr 13, 2010, at 1:40 PM, G8KBV wrote:
When I 'make buildkernel KENRCONF=PPSGENERIC'
Nowt happens, except a short error message to the effect that it doesnt
know how to build the kernel.
Err, what!
That should be KERNCONF, not KENRCONF. Of course, you should provide the exact
Marc Fromm wrote:
If I restart the ntpd service the time is updated to the correct time:
/sbin/service ntpd restart
I.E. /etc/init.d/ntpd restart
which, although a deprecated procedure, will probably run ntpdate.
If I run the command below the time is updated to the correct time:
ntpdate -u
Rob nom...@example.com wrote in
news:slrnhs9f0a.n5.nom...@xs8.xs4all.nl:
unruh un...@wormhole.physics.ubc.ca wrote:
Of course. That is the thing about solutions. You provide extra
information or hardware that is needed to impliment the solution. Now
if you have a better one, I am sure he
Hi--
On Apr 13, 2010, at 1:45 PM, Marc Fromm wrote:
If I restart the ntpd service the time is updated to the correct time:
/sbin/service ntpd restart
If I run the command below the time is updated to the correct time:
ntpdate -u time-nw.nist.gov
If I don't do any of the above my time is
Rob nom...@example.com wrote in message
[]
Ok, that is good.
When you get an openSUSE 11.2 DVD you can install a system and configure
NTP on it using only the GUI, no need to edit any files.
.. what, even if I want to add a GPS using kernel-mode PPS and change the
servers to suit my system?
In article f49920cd-8c36-4b78-94f1-1d8d5c092...@mac.com,
cswi...@mac.com says...
On Apr 13, 2010, at 1:40 PM, G8KBV wrote:
When I 'make buildkernel KENRCONF=PPSGENERIC'
Nowt happens, except a short error message to the effect that it doesnt
know how to build the kernel.
Err,
On Apr 13, 2010, at 3:59 PM, G8KBV wrote:
Typo on my part. In the posting AFIK.
OK...although it's hard to say for sure. :-)
[ ... ]
I can't copy/paste from the FreeBSD machine to this one, and I have no
idea how to copy paste from the command line/terminal screen, to a
floppy (or
I am using RedHat 5.2 and running ntp-4.2.2p1-9.el5_4.1.
The server loses 1 second per minute.
I've been checking it since I manually updated the time and after 2 hours it is
2 minutes and 1 second behind.
ntpq -p produces the following:
remote refid st t when poll reach
unruh writes:
He wants ms accuracy, GPS will give him usec accuracy. At present his
network connection is flakey-- changing from 1ms delay to 30ms delay,
and almost certainly asymmetric. It is impossible to get ms accuracy
under those conditions. There are thus a numbr of solutions. One is to
On 2010-04-13, Marc Fromm marc.fr...@wwu.edu wrote:
I am using RedHat 5.2 and running ntp-4.2.2p1-9.el5_4.1.
The server loses 1 second per minute.
ntpd cannot fix that. chrony could, just. But it indicates some severe
problem. Is this a virtual server running on some other hardware?
Nothing
On 2010-04-13, Marc Fromm marc.fr...@wwu.edu wrote:
If I restart the ntpd service the time is updated to the correct time:
/sbin/service ntpd restart
What distribution?
If I run the command below the time is updated to the correct time:
ntpdate -u time-nw.nist.gov
If I don't do any of the
Rob nom...@example.com wrote in message
news:slrnhs953g.vh5.nom...@xs8.xs4all.nl...
[]
In many applications, it is more important that all devices within
some environment agree upon the same standard time, than that this
standard time is within a small offset of true atomic time.
However,
G8KBV wrote:
In article f49920cd-8c36-4b78-94f1-1d8d5c092...@mac.com,
cswi...@mac.com says...
On Apr 13, 2010, at 1:40 PM, G8KBV wrote:
When I 'make buildkernel KENRCONF=PPSGENERIC'
Nowt happens, except a short error message to the effect that it doesnt
know how to build the kernel.
Err,
Richard B. Gilbert writes:
With a closed network the options are limited. With a place to site a
GPS antenna, you can install a GPS clock that will be accurate to
within +/- 50 nanoseconds.
It occurs to me that the sort of fancy GPS that an oceanographic ship is
sure to have on the bridge may
On Apr 13, 2010, at 4:13 PM, Marc Fromm wrote:
[ ... ]
The server loses 1 second per minute.
I've been checking it since I manually updated the time and after 2 hours it
is 2 minutes and 1 second behind.
adjtime() used by ntpd and others typically won't correct more than about 2
seconds per
On 2010-04-14, Chuck Swiger cswi...@mac.com wrote:
On Apr 13, 2010, at 4:13 PM, Marc Fromm wrote:
[ ... ]
The server loses 1 second per minute.
I've been checking it since I manually updated the time and after 2 hours it
is 2 minutes and 1 second behind.
adjtime() used by ntpd and others
unruh wrote:
Marc Fromm marc.fr...@wwu.edu wrote:
The server loses 1 second per minute.
I've been checking it since I manually updated the time and after 2 hours it
is 2 minutes and 1 second behind.
ntpq -p produces the following:
remote refid st t when poll reach
On Apr 14, 01:40 UTC, unruh wrote:
ntpd can only correct 500PPM (that is about 1.5 sec/hr) and if
the clock frequ gets higher, it gives up and quits doing anything.
Not quite. ntpd can only slew away errors using a maximum slewing
correction of 500 PPM. The daemon does not give up, in that
G8KBV wrote:
Hi all again.
I'm still trying to follow the instructions at:-
http://blog.doylenet.net/?p=145
As earlier, so far so good (if after several tries, eventualy getting
FreeBSD loaded and running) I'm at the stage of enabling PPS support in
the kernel.
But
After successfully
John Hasler wrote:
Richard B. Gilbert writes:
With a closed network the options are limited. With a place to site a
GPS antenna, you can install a GPS clock that will be accurate to
within +/- 50 nanoseconds.
It occurs to me that the sort of fancy GPS that an oceanographic ship is
sure to
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