On 2013-09-25, John Hasler jhas...@newsguy.com wrote:
I wrote:
The Pi GPIO pins have pullups. Just use an open-collector driver.
unruh writes:
That of course assumes that you, not the designer of the gps card say,
have designed the output.
I'm suggesting adding an open-collector driver
I wrote:
I'm suggesting adding an open-collector driver rather than adding a
network of resistors and diodes. Fewer parts and better results.
unruh writes:
Probably. I'm a bit worried if the base voltage is higher than the
collector.
A single transistor with a base current limiting resistor
On 25 Sep, 2013, at 12:04 , John Hasler jhas...@newsguy.com wrote:
I wrote:
I'm suggesting adding an open-collector driver rather than adding a
network of resistors and diodes. Fewer parts and better results.
unruh writes:
Probably. I'm a bit worried if the base voltage is higher than
Dennis Ferguson writes:
If you are doing it with an IC a 3.3V buffer with overvoltage tolerant
inputs would be better. A 74HC4050 run at 3.3V would probably do it,
if you don't need input protection (against 15V or 0V inputs) it
needs no additional external components.
There are lots of
On 2013-09-25, Dennis Ferguson dennis.c.fergu...@gmail.com wrote:
On 25 Sep, 2013, at 12:04 , John Hasler jhas...@newsguy.com wrote:
I wrote:
I'm suggesting adding an open-collector driver rather than adding a
network of resistors and diodes. Fewer parts and better results.
unruh writes:
unruh writes:
Except a power supply, which can be a pain.
5V and 3.3V are available on the Pi board.
--
John Hasler
jhas...@newsguy.com
Dancing Horse Hill
Elmwood, WI USA
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detha wrote:
On Sun, 15 Sep 2013 18:56:26 +0100, David Taylor wrote:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one could put a diode in series with the
On 2013-09-24, Uwe Klein u...@klein-habertwedt.de wrote:
detha wrote:
On Sun, 15 Sep 2013 18:56:26 +0100, David Taylor wrote:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a
unruh writes:
The Raspberry Pi specifically states that it is NOT 5V tolerant.
The Pi GPIO pins have pullups. Just use an open-collector driver.
--
John Hasler
jhas...@newsguy.com
Dancing Horse Hill
Elmwood, WI USA
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On 2013-09-24, John Hasler jhas...@newsguy.com wrote:
unruh writes:
The Raspberry Pi specifically states that it is NOT 5V tolerant.
The Pi GPIO pins have pullups. Just use an open-collector driver.
That of course assumes that you, not the designer of the gps card say,
have designed the
I wrote:
The Pi GPIO pins have pullups. Just use an open-collector driver.
unruh writes:
That of course assumes that you, not the designer of the gps card say,
have designed the output.
I'm suggesting adding an open-collector driver rather than adding a
network of resistors and diodes.
On Sun, 15 Sep 2013 18:56:26 +0100, David Taylor wrote:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one could put a diode in series with the line to bring
On 15/09/2013 20:08, David Lord wrote:
[]
My Sure gps has both 5V ttl and 3.3V levels available by
soldering wires or fitting a pin header. I had tried both
the 5V ttl to parallel port and currently using your rs232
modification. I didn't note any significant difference in
parallel port vs
Not sure why you would want a resistive divider. The diode would do it
just as well and you would not have to worry about the input impedence
of the GPIO. The GPIO already have an input impedence and you should not
have to worry about current limits as long as the voltage was low
enough.
On 2013-09-16, detha de...@foad.co.za wrote:
On Sun, 15 Sep 2013 18:56:26 +0100, David Taylor wrote:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one
On 15/09/2013 00:06, unruh wrote:
[]
But even that does not help. If your outgoing message to the ntp server
goes from California to New York via Kansas, and the return consistantly
goes via the moon, your computer will always be about 2 seconds behind
UTC, even if the offset is always 0.
Over a
On 14/09/2013 21:39, W. eWatson wrote:
[]
A little bit of data from the two XP PCs:
Older and more troublesome PC
Jitter high 300-650
Offset around 685
Delay about 100.xxx
Reach 80 jumped to 377 an hour later
One * for the single pool
Newer XP
Jitter low, 11-8
Reach 377
* + - +
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 15/09/2013 00:06, unruh wrote:
[]
I was probably refering to the Sure unit which is more difficult.
I have never looked at the Adafruit module. Also doesn't the Adafruit
also require an extra antenna to work
On 15/09/2013 08:09, unruh wrote:
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
[]
Yes, the Sure unit, another low-cost option, does require a little
modification to extract the PPS signal at RS-232 levels, although based
That would completely burn out the RPi GPIO
On 9/14/2013 11:53 PM, David Taylor wrote:
On 14/09/2013 21:39, W. eWatson wrote:
[]
A little bit of data from the two XP PCs:
Older and more troublesome PC
Jitter high 300-650
Offset around 685
Delay about 100.xxx
Reach 80 jumped to 377 an hour later
One * for the single pool
Newer
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 15/09/2013 08:09, unruh wrote:
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
[]
Yes, the Sure unit, another low-cost option, does require a little
modification to extract the PPS signal at
On 15/09/2013 18:08, W. eWatson wrote:
[]
As a last resort to the timing problem, I might bring the PC into my den
and see if the timing is still flaky. This is no longer a high priority
issue. I'll pick at it as I can.
Just pop back if and when you need further help.
--
Cheers,
David
Web:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one could put a diode in series with the line to bring it down to
3.3V.
I would recommend using a restive
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 15/09/2013 18:37, unruh wrote:
[]
Yes, I saw it. Not sure what the voltages are on the Sure unit -- the
direct output of the PPS but I think 5V which is still a bit high. I
guess one could put a diode in series with
David Taylor wrote:
On 15/09/2013 08:09, unruh wrote:
On 2013-09-15, David Taylor david-tay...@blueyonder.co.uk.invalid
wrote:
[]
Yes, the Sure unit, another low-cost option, does require a little
modification to extract the PPS signal at RS-232 levels, although based
That would completely
On 2013-09-13 22:48, W. eWatson wrote:
On 9/13/2013 4:41 PM, W. eWatson wrote:
On 9/13/2013 3:29 PM, E-Mail Sent to this address will be added to the
BlackLists wrote:
W. eWatson wrote: Where do I execute this from?
Run? c:\Program Files\NTP\bin\ntpq -pn
Likely the correct path.
Run: cmd
On 14/09/2013 05:48, W. eWatson wrote:
What have I gained? What does the data mean from ntpq -n -clpe -clas?
Please see:
http://www.satsignal.eu/ntp/setup.html#check
for a brief guide to checking that NTP is working.
The command ntpq -p or ntpq -pn will show the delay between the
On 14/09/13 10:45, David Taylor wrote:
servers 100+ ms for servers on an inappropriate continent), and the
offset column shows how well NTP is doing, the lower the offset the
nearer to UTC is your PC running. The offset value will be highly
Offset doesn't tell you this. It tells you the
On 14/09/2013 14:56, David Woolley wrote:
[]
Offset doesn't tell you this. It tells you the difference between the
best estimate of the local clock and best estimate of the time on the
immediately upstream server, at the time of the last poll. The latter,
in particular, may be subject to
On 2013-09-14, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 14/09/2013 05:48, W. eWatson wrote:
What have I gained? What does the data mean from ntpq -n -clpe -clas?
Please see:
http://www.satsignal.eu/ntp/setup.html#check
for a brief guide to checking that NTP is
On 14/09/2013 17:56, unruh wrote:
[]
Well, no. The offset tells you what the difference is between the time
as measured from that remote server and the time on your system. If the
path is completely symmetric, then that time time is also the remote
servers best estimate of UTC (and depending
On 9/14/2013 2:45 AM, David Taylor wrote:
On 14/09/2013 05:48, W. eWatson wrote:
What have I gained? What does the data mean from ntpq -n -clpe -clas?
Please see:
http://www.satsignal.eu/ntp/setup.html#check
for a brief guide to checking that NTP is working.
The command ntpq -p or ntpq
On 2013-09-14, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 14/09/2013 17:56, unruh wrote:
[]
Well, no. The offset tells you what the difference is between the time
as measured from that remote server and the time on your system. If the
path is completely symmetric, then that
So you are suggesting to use development binaries at
http://www.meinbergglobal.com/english/sw/ntp.htm? On the download page
I see Software Development Kits SDKs for different programming
languages and development environments to access a Meinberg device from
within own applications. However,
W. eWatson wrote:
OK, I'll use pool uk.pool.ntp.org iburst
If you are in the UK than I bet that works much better than
using US refclocks.
--
E-Mail Sent to this address blackl...@anitech-systems.com
will be added to the BlackLists.
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W. eWatson wrote:
(Newer) is hardly used, and I noted according to my
atomic clock it was something like 5 minutes off.
If it is running ntp;
It either had only 1 refclock configured, that was wrong,
or it didn't have connectivity to its refclocks (internet)
for a really long time (or
On 9/13/2013 3:29 PM, E-Mail Sent to this address will be added to the
BlackLists wrote:
W. eWatson wrote: Where do I execute this from?
Run? c:\Program Files\NTP\bin\ntpq -pn
Likely the correct path.
Run: cmd
doesn't work there. c:\Program Files\NTP\bin\ntpq
gives me a DOS window
It
On 2013-09-13 17:41, W. eWatson wrote:
On 9/13/2013 3:29 PM, E-Mail Sent to this address will be added to the
BlackLists wrote:
W. eWatson wrote: Where do I execute this from?
Run? c:\Program Files\NTP\bin\ntpq -pn
Likely the correct path.
Run: cmd
doesn't work there. c:\Program
On 9/13/2013 4:41 PM, W. eWatson wrote:
On 9/13/2013 3:29 PM, E-Mail Sent to this address will be added to the
BlackLists wrote:
W. eWatson wrote: Where do I execute this from?
Run? c:\Program Files\NTP\bin\ntpq -pn
Likely the correct path.
Run: cmd
doesn't work there. c:\Program
On 9/11/2013 12:31 PM, David Taylor wrote:
On 11/09/2013 18:22, W. eWatson wrote:
[]
Not sure what you mean by Copy the current development. Why not
uninstall the present version, and start with a newer one?
The development versions don't some with an installer - just the
executables. There
W. eWatson wrote:
To get the best timekeeping, I would recommend that you
up#grade to the current Meinberg port (4.2.6p5),
and then copy the current development version binaries
on top of a working 4.2.6p5 installation.
The binaries can be had here (except for Windows 2000):
...
I tried Meinberg for quite some time, but it flops fairly often. As I
flops? What are the symptoms? Also, if time is important why not invest
in a GPS (35 dolalrs or so) with PPS.
It moves many seconds in a short time, say a day or two. How is GPS
going to help? Does it provide access
On 2013-09-09, W. eWatson wolftra...@invalid.com wrote:
On 9/8/2013 12:02 PM, unruh wrote:
On 2013-09-08, W. eWatson wolftra...@invalid.com wrote:
On 9/7/2013 9:16 PM, David Taylor wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
On 9/8/2013 10:31 PM, David Taylor wrote:
On 08/09/2013 19:23, W. eWatson wrote:
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
24
On 09/09/2013 22:54, W. eWatson wrote:
[]
http://www.meinbergglobal.com/english/sw/ntp.htm
My version is 4.2.4.p8@lennon -o
That's quite an old version, and I would advise that you do a Files
only update from the site above.
--
Cheers,
David
Web: http://www.satsignal.eu
On 09/09/2013 20:57, W. eWatson wrote:
[]
It moves many seconds in a short time, say a day or two. How is GPS
going to help? Does it provide access via a USB port.
You can use GPS over a serial-to-USB converter. You may also find that
your motherboard has a COM port header even though it's
On 08/09/2013 06:27, unruh wrote:
On 2013-09-08, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would
unruh un...@invalid.ca wrote:
Why would you want to use this software? It has a hardwired list of ntp
time servers built in. A definite nono. Overload those servers.
(espeically if what they said is true, that it has been downloaded 10
million times)
It does the most basic sntp protocol and
On 9/7/2013 9:16 PM, David Taylor wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would appreciate a $10 donation. Oddly it comes w/o
any description to
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
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On 2013-09-08, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 08/09/2013 06:27, unruh wrote:
On 2013-09-08, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
What about the above? Does the user set the drift, and, if 24.793 is in
On 08/09/13 20:46, W. eWatson wrote:
What about the above? Does the user set the drift, and, if 24.793 is in
seconds, why so big?
The user doesn't set it (although there are unusual cases where that
might be useful. It is set every hour when ntpd is synchronised. It is
used to speed up
On 2013-09-08, W. eWatson wolftra...@invalid.com wrote:
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
What about the
W. eWatson wrote:
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
What about the above? Does the user set the drift,
On 2013-09-08 11:51, W. eWatson wrote:
On 9/7/2013 9:16 PM, David Taylor wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would appreciate a $10 donation.
On 08/09/2013 19:23, W. eWatson wrote:
Some settings that may be of interest.
NTP servers
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
ntp.drift contains
24.793
24 ppm is not a large error, and quite
On 08/09/2013 19:59, unruh wrote:
I had thought I made clear I was replying to the original not to your
comments. Sorry, if that was not clear.
No problem, Bill!
--
Cheers,
David
Web: http://www.satsignal.eu
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I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would appreciate a $10 donation. Oddly it comes w/o
any description to use it. Am I missing something? I'm running it on my
XP machine. Nothing is said
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would appreciate a $10 donation. Oddly it comes w/o
any description to use it. Am I missing something? I'm running
On 2013-09-08, David Taylor david-tay...@blueyonder.co.uk.invalid wrote:
On 07/09/2013 22:38, W. eWatson wrote:
I'm told that Dimension 4 is an accurate time keeper.
http://www.thinkman.com/dimension4/ I downloaded it and installed it.
It's freeware, but would appreciate a $10 donation. Oddly
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