Hi there
On 23/08/2020 14:10, Uwe Klein wrote:
Anybody else getting "request received" from TheFork
and a bunch of "undeliverable" from uscc.net
for each posting to comp.protocols.time.ntp ?
I got some canned replies from various help desks, including the fork's,
claiming that I
Hi there
On 24/08/2020 16:07, William Unruh wrote:
It was renamed because UTC has nothing to do with Greenwich. For
historical reasons, the time at Greenwich is the same as UTC.
They are not perfectly identical. The difference is however less then
one second;
GMT is mean solar time.
UTC
Hi there
Rob van der Putten wrote:
Cut
A lot of people however, by an embedded system, hook op a GPS receiver,
find that PPS doesn't work and then just give up.
Apparently GPSD supports PPS on CTS.
So if you already have got an embedded system and a GPS receiver and
your 232 cape supports
Hi there
Paul wrote:
One normally uses a so-called GPIO pin to read PPS on systems that
lack a DCD line or a parallel port. E.g. BeagleBone or Raspberry Pi.
Obviously.
A lot of people however, by an embedded system, hook op a GPS receiver,
find that PPS doesn't work and then just give up.
Hi there
Jaap Winius wrote:
Has anyone here managed to turn a relatively cheap, ARM-based embedded
system with a serial port into a decent stratum 1 NTP server?
Thus far I've always attached my GPS and radio time signal receivers to
much larger x86 hardware platforms, but those machines have
Hi there
ksprabha wrote:
Kindly let me know what is the difference between NTP with PPS and NTP with out
PPS.
NMEA can be a bit off with some GPS receivers. PPS tends to be very
accurate.
When using RS232, NMEA is send via a data line. PPS via the DCD status line.
A few graphs;
Hi there
Edward T. Mischanko wrote:
Question: If I'm using a GPS (Garmin 18x LVC) for a reference clock, Is
the NMEA time stamp already in UTC?
Yes. It does GPS time as well;
http://www8.garmin.com/manuals/425_TechnicalSpecification.pdf
If my time stamp is already UTC, then won’t I
Hi there
Pierre Dubuc wrote:
You can get it from one of the NIST mirrors:
ftp://utcnist2.colorado.edu/pub/
It hasn't been updated yet.
This one is;
ftp://utcnist.colorado.edu/pub/
It's leap-seconds.3535228800
Regards,
Rob
--
Wim T. Schippers for president
Hi there
unruh wrote:
Do not work what way?
What I meant was that it would be nice to run TAI instead of UTC.
It is announced now, it occurs Jun 30.
The tzdata database contains a file called leapseconds which contains
all of the leapseconds which have occured or are know to occur in the
Hi there
unruh wrote:
Not sure what you are saying. it does-- what does? And what does
'right' mean here.
'right' is just a directory name. 'it does' means the file contains leap
second info;
file /usr/share/zoneinfo/posix/Europe/Amsterdam
/usr/share/zoneinfo/posix/Europe/Amsterdam:
Hi there
There's a leap second coming up;
http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat
Where do I get a leap seconds file (leap-seconds.3550089600?)?
Regards,
Rob
--
Wim T. Schippers for president
Hi there
Danny Mayer wrote:
This is the first time that I remember a leap second being added in the
middle of the year instead of the end of December. Am I wrong?
From leap-seconds.3427142400;
2272060800 10 # 1 Jan 1972
2287785600 11 # 1 Jul 1972
2303683200 12
Hi there
unruh wrote:
Probably due to the lawsuit.
It will presumably be in the next release (tzdata2012a) of the tzdata
database.
www.iana.org/time-zones
There is no great hurry. It is still 6 months off.
Unfortunately, leap seconds don't work this way.
Regards,
Rob
--
Wim T. Schippers
Hi there
Richard B. Gilbert wrote:
It's unfortunate that the earth DOES NOT rotate exactly 360 degrees in
exactly 24. hours. This bit of poor design causes all sorts
of problems.
It's about 361°, 23:56:04.1 for 360°.
Leap seconds are just one of the symptoms!
It not just
Hi there
Miguel Gonçalves wrote:
Found out what the problem is...
The device has definetely lost its configuration but isn't able to keep the
saved configuration.
I went to the configuration software and used the option Get Configuration
from GPS then changed the PPS length to 200 ms then
Hi there
Marc-Andre Alpers wrote:
I have no RS232 tester. The cover of the receiver is sealed. No screws.
http://666kb.com/i/bf7g1grgo1sbus2c1.jpg
The connector inside:
http://666kb.com/i/bf7fxqd8cr17q7d8x.jpg
That's female on the left and male on the right?
Hi there
David Lord wrote:
I saw it as CTS on brown and RI on Orange
Correct.
All refclocks docs I've checked, by no means all, expect serial
data on RxD.
Rewiring the plug might help;
Brown and Orange probably have opposite polarity;
+-+ +-++ 12 V
| | | |
Hi there
Marc-Andre Alpers wrote:
The Clock works correctly on windows with the programm DCF77_32.exe provided
on this site: http://www.rrs-web.net/in3her/dcf77_32.html
This is about a Conrad DCF77 receiver. A Conrad DCF77 receiver doesn't
have a LED.
And NTPD usually receives data on RXD.
Hi there
Marc-Andre Alpers wrote:
I can give you a Picture:
http://666kb.com/i/bf7er4kfwd3feibip.jpg
Definitly not a a Conrad.
Anyway, some specs would be nice. Lacking those a bit of reverse
engineering.
Have you tried a RS232 tester? Which LEDs are on? Which colour? Which
one blinks?
Hi there
I read that kernel PPS support is now part of vanilla kernels (no patch
required). Since when? Which is the oldest kernel with PPS support?
Regards,
Rob
--
Nowadays people know the price of everything, and the value of nothing
Oscar Wilde
Hi there
pc wrote:
FWIW, it's possible that the antenna/receiver modules are manufactured
by this company:
http://www.hkw-elektronik.de/
http://www.hkw-elektronik.de/englisch/products/products.php
http://www.hkw-elektronik.de/englisch/products/assemblys.php
Regards,
Rob
--
There are
Hi there
Pete Ashdown wrote:
The clocks take input from a module like this:
http://clausurbach.de/shop/product_info.php?info=p50_dcf77-module-for-our-nixie-clock-kits.html
It looks pretty much line an antenna to me. So what I'd like is a preferably
cheap option to duplicate that signal
Hi there
Rob van der Putten wrote:
This will probably work;
+- DATA
|
|
| / c
+-+ b |/
TXD -+ 4k7
Hi there
David Lord wrote:
Conrad DCF77 module here works ok on MSF. I had to swap xtal and aerial.
If you can find the type of receiver chip and see the xtal and aerial
connections it's probably worth looking up if chip will pickup WWV. I
can't find my Conrad data but I think that also
Hi there
Pete Ashdown wrote:
I've bought a number of clocks from Germany that use DCF-77 for time
set/synchronization. Needless to say, here in the states I can't use DCF-77.
I have see a number of GPS - DCF-77 converters, but since I have a GPS synced
NTP server, I'd rather just pull time
Hi there
David Lord wrote:
I've recently been trying various radioclocks, gps, DCF77 and now MSF.
I have problems with reception being in a valley with horizon over
most of 360deg being 50m or so above the house. Cloudbase is often
below height of surrounding hills.
On good days Garmin
Hi there
Rob wrote:
Of course. You can do it at any time, I got the above output from my
own DCF77 receiver port.
sput:~# stty -a /dev/refclock-0
speed 50 baud; rows 0; columns 0; line = 0;
intr = undef; quit = undef; erase = undef; kill = undef; eof =
undef; eol = undef; eol2 = undef;
Hi there
Rob van der Putten wrote:
sput:~# stty -a /dev/refclock-0
speed 50 baud; rows 0; columns 0; line = 0;
At 50 baud 9 bits (start + 8 data) is 180 ms. The max pulse length is
just under 200 ms, so there is no stopbit. Is this OK? Should I build a
circuit to reduce the max pulse
Hi there
Rob wrote:
No you should not touch the pulse length, it conveys the time information.
50 baud is the correct setting for the port.
If missing a stopbit on each '1' is OK.
There have been various problems in the parse driver that cause things
like trash being written to the
Hi there
From the syslog;
Feb 24 15:24:05 sput ntpd[28039]: parse: convert_rawdcf: INCOMPLETE DATA
- time code only has 3 bits
Feb 24 15:24:05 sput ntpd[28039]: PARSE receiver #0: interval for
following error message class is at least 00:01:00
Feb 24 15:24:05 sput ntpd[28039]: PARSE receiver
Hi there
Rob wrote:
Most likely some stupid program has changed the settings of the COM port.
(especially the baudrate)
For example, in SuSE Linux when you are so unfortunate to click on the
hardware information icon in YaST, everything is messed up in the process
of detecting what is
Hi there
Rob wrote:
So do a stty -a /dev/refclock-0 the next time it is messed up again.
Then you should get this output:
speed 50 baud; rows 0; columns 0; line = 0;
intr = undef; quit = undef; erase = undef; kill = undef; eof =
undef;
eol = undef; eol2 = undef; swtch = undef; start
Hi there
Brian Inglis wrote:
Is spread specturm clock signal generation (EMI reduction) disabled for
the CPU and buses in the firmware?
These are the BIOS options;
CPU Spread Spectrum [Auto]
Allows you to enable or disable the CPU spread spectrum.
Configuration options: [Auto] [Disabled]
Hi there
Adam Myrow wrote:
It would be interesting to know what kernel version those who are having
trouble with unstable drift in Linux are using. I am using kernel
2.6.27.7,
2.6.26
and it is very stable, varying no more than 5 PPM, even across
reboots. It should be noted that I
Hi there
One of my Debian Lenny boxes more then halved it's 'frequency' after a
software update (among others, kernel and ntpd). It used to be 43 ppm
and is now below 17 ppm and still dropping.
Is this normal?
Regards,
Rob
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Hi there
Unruh wrote:
Apparently a number of Linux machines completely locked up at the leap
second. Problems in the kernel ntp.c code apparently.
One of mine did;
I have two Debian Lenny boxes. Kernel 2.6.26-1-486 on a AMD Athlon, and
2.6.26-1-686 on Core 2 Quad. Both are based on Linux
Hi there
Unruh wrote:
Yes, well... The RS232 standard says that teh signal levels are -12V and
+12V and that the absolute minimum be -5V and +5V. However, many serial
chip makers have bent those standards and the serial port may or may not
respond to the 0,5 level that the PPS output
Hi there
David Woolley wrote:
V.24 doesn't specify electrical characteristics. I suspect you mean
V.28.
The standard was 'split' at some point (I haven't looked into this stuff
for years).
RS232 C is also 25 volts, open circuit, although drivers for both
standards are not required to
Hi there
Richard B. Gilbert wrote:
I predict that the leap second will be ignored by at least 98% of the
world! Most people cannot set their clocks to the correct second and
most would not bother if they could.
The leap second will be important to astronomers, navigators, the NIST
Hi there
Unruh wrote:
It depends. Some people regard the leapsecond as counting
23:59:0 23:59:1 ...25:59:59 23:59:60 0:0:0
while I think the leapsecond standard is actually
23:59:0 23:59:1 ...25:59:59 0:0:00:0:0
Ie it occurs on teh first second of the new year, rather than the last
Hi there
George R. Kasica wrote:
Cut
If I switch to the following settings I can seem to get NEMA data but
then I lose the PPS function which hurts the accuracy far more. Do you
know if shm can somehow allow both with some type of setting - ideally
that is what I'm trying to accomplish
Hi there
George R. Kasica wrote:
Did you need to use two physical serial plugs or a splitter or just do
this with symlinks in the OS?
Two plugs.
Regards,
Rob
--
Anglo-Saxon management is a memetic virus
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Hi there
Some of my experiences with this Garmin and GPSD;
The Garmin isn't necessaryly set to defaults. Reset with: $PGRMO,,4
Then set the output pulse length to 200 ms; $PGRMC,9,
These should be terminated with a CrLf pair.
If connected directly to Minicom, the Garmin appears to
Hi there
Hal Murray wrote:
That site is unlikely to be down for long.
It's still down.
I can ping time.nist.gov, but it won't FTP.
Are you behind a NAT box? I need to use the passive mode for ftp.
No.
I also tried the shell box at my ISP.
Same result.
Regards,
Rob
Hi there
David L. Mills wrote:
I am told the file is on all NTP servers operated by NIST. See the list
of public servers at NIST or www.ntp.org.
ftp://ntp-a.boulder.nist.gov/pub/leap-seconds.3427142400 works
Thanks!
Regards,
Rob
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Hi there
Antonio M. Moreiras wrote:
Cut
1 - download ftp://time.nist.gov/pub/leap-seconds.3427142400
Is there an other source?
This site appears to be down.
Cut
Regards,
Rob
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Hi there
David Woolley wrote:
Cut
Strictly speaking, there is no standard that permits non-ASCII material
on USENET, although the de facto position is that MIME is permitted.
There are still some important USENET user agents that are not MIME
aware and USENET can get transported over
Hi there
Ryan Malayter wrote:
On Sun, Oct 26, 2008 at 2:48 PM, Unruh [EMAIL PROTECTED] wrote:
That may be what you expect, but you can get it 1usec (1 micro second).
Is there something wrong with the mail gateway and Unicode? I posted
my message as text/plain with charset=UTF-8, which
Hi there
Ryan Malayter wrote:
Interesting. The non-ASCII symbols in your message appeared just fine
to me,
But your post doesn't;
The Content-type is text/plain; charset=windows-1252. The content
encoding is 7bit.
Something is seriously broken.
but I assume that is because we are both
Hi there
David J Taylor wrote:
Those characters display correctly on my NNTP feed from my ISP, using
Microsoft Outlook Express for news-reading.
You convert the text without stating the charset used, which makes non
ascii unreadable.
This is probably an Outlook bug.
Regards,
Rob
Hi there
Johan Swenker wrote:
Be sure to upgrade to gpsd 2.36, or backport the leapyear patch which
was distributed on januari 1st.
You also need a patch;
http://www.nabble.com/Bug---Switching-Drivers-from-Generic-NMEA-to-Garmin-serial-creates-2-gpsd_ppsmonitor-threads-td14770083.html
Hi there
Unruh wrote:
This is confusing. You first say that one NMEA sentence pers second is too
much data, and then that youarranged that it sent 6 sentences per second.
Note that only one sentence ( which should take about 140ms at 4800Bd) is
allo you need.
GPRMC, GPGGA, GPGSA and three
Hi there
root wrote:
No GPS NMEA should not do that. The length of the sentence is almost fixed
length, so the timing on it should vary by perhaps a few msec, as you found,
certainly not by seconds. It sounds like you have troubles.
You could try using minicom ( assuming you are on
Hi there
Rob van der Putten wrote:
Cut
My Garmin was sending to much data, sending a NMEA sentence once per
second.
Sorry, once per two seconds.
Cut
Regards,
Rob
--
When the Iron Curtain fell, all of the West rejoiced that the East
would become just as free as the West. It was never
Hi there
Steve Kostecke wrote:
There is no benefit to sending all of those NMEA sentences.
Select one and turn the rest off.
For just time GPRMC will do.
Regards,
Rob
--
When the Iron Curtain fell, all of the West rejoiced that the East
would become just as free as the West. It was
Hi there
Hal Murray wrote:
I got my GPS 18 LVC from Provantage (www.provantage.com).
Their web page says they ship internationally, but I don't
know how their total cost compares to any other place.
They do American express only (no other credit cards) and bank transfers.
Transfers in de
Hi there
Dennis Hilberg, Jr. wrote:
Garmin sells it from their website for 74.50 USD:
https://buy.garmin.com/shop/shop.do?pID=223tab=gps18oem
They don't ship outside the USA.
I bought mine from MegaGPS.com for 64.99 USD + 5.95 USD shipping:
Hi there
Dennis Hilberg, Jr. wrote:
It works fine for me using Firefox 2.0.0.9. Have you tried using a
different browser?
Mozilla and Konqueror. Complains about not being able to calculate the
shipping charges.
This seems to work though;
Hi there
John Ioannidis wrote:
Out of curiosity: what is wrong with the Garmin GPS 18LVC that someone
would like to look at an alternative? At $70, it's practically free.
Where can get one in Europe?
USD 68.50 is ca € 50.-
Some EU webshops sell it for € 114.-, which is ca USD 156.-
Or can I
--
+--+
| Rob van der Putten, [EMAIL PROTECTED]|
| http://www.sput.nl/spam/spam-policy.html |
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