I like the ped-countdown displays here (San Jose, US) because I can better
judge if I'll need to stop or not when approaching an intersection. I've
noticed the drivers getting worse and worse about following basic laws like
stopping at red lights. Rush hour only makes things worse- at the
Finally got a chance to play with my 5680A, and was happy to see that it locks
in about 45 seconds from cold. The messy 10Mhz output is about 80mVpp, but the
weird thing is the output on pin 6 (1PPS). The output is a 20 microsecond,
1.8Vpp, square wave that is clean on top, but rings like
On Sun, 15 Jan 2012 16:45:56 +0100
Magnus Danielson mag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might
be tempting, but I consider any clone dirty from a rights perspective,
MIPS for instance have been very protective on their side, so
On Sun, 15 Jan 2012 11:27:27 -0500
paul swed paulsw...@gmail.com wrote:
FPGAs are generally intended for the mass market with a steep learning
curve. Though they can be pressed into whats of interest to time-nuts it
simply seems like a overly complicated technology and method for a non-mass
On Sun, 15 Jan 2012 19:24:24 -0800
gary li...@lazygranch.com wrote:
Is it possible these wireless providers are using something like NTP on
steroids with a Rb clock rather than GPSDO?
Nope. NTP does not give you enough stability, nor accuracy, nor precision.
The best you can get out of NTP
Hello group,
I hope the new year finds you all well?
I have just received an Austron 2010B Disciplined frequency standard.
Could some kind soul help me out with an operations manual?
Many thanks,
Mark
inline: image001.gif___
time-nuts mailing
The best you can get out of NTP is about 1ms. While UMTS needs something
in the us range for proper working IIRC.
Attila Kinali
NTP fed with a PPS source can do much better than 1 ms. Here's a
non-temperature-controlled, simple Intel Atom system providing within 10
microseconds using
On 1/15/2012 10:24 PM, gary wrote:
Is it possible these wireless providers are using something like NTP on
steroids with a Rb clock rather than GPSDO?
They are moving to using IEEE 1588 for site synchronization. I guess you
could consider it something like NTP on steroids. It requires
Hehe - try driving in Napoli some day - makes Roma seem positively sane, and
Torino is civilised compared to Roma!
D.
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and
This is why the North-Italy territory wants to be separeted the rest of
Italy..hihi
EP.
-Original Message-
From: David C. Partridge david.partri...@perdrix.co.uk
To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com
Sent: Mon, Jan 16, 2012
The best you can get out of NTP is about 1ms. While UMTS needs something
in the us range for proper working IIRC.
Attila Kinali
NTP fed with a PPS source can do much better than 1 ms. Here's a
non-temperature-controlled, simple Intel Atom system providing within 10
microseconds using
Il 16/01/2012 13.00, time-nuts-requ...@febo.com ha scritto:
Send time-nuts mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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--
Doc
Bill Dailey
KXØO
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INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
SERVICE DE LA ROTATION TERRESTRE
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. : 33 (0) 1 40 51 22 26
FAX : 33
please, before write look in your home than respect other people.
thanks
Luciano
--
Luciano P. S. Paramithiotti
IZ5JHJ
- Original Message
From: Discussion of precise time and frequency measurement
time-nuts@febo.com
To: 'Discussion of precise time and frequency measurement'
Hi
The lock range of the 5680 is limited only by the range of the VCXO. The DDS
has way more range than the VCXO does and there's nothing else in that loop.
The rubidium cell does not change frequency when the DDS is tuned, so that
entire loop is not a limiting factor. As you approach the edge
On 1/16/12 2:44 AM, Attila Kinali wrote:
On Sun, 15 Jan 2012 11:27:27 -0500
paul swedpaulsw...@gmail.com wrote:
FPGAs are generally intended for the mass market with a steep learning
curve. Though they can be pressed into whats of interest to time-nuts it
simply seems like a overly
d.sei...@comcast.net schrieb:
could write tickets when you had enough hits on your car... Worst
offenders? BMW and Audi drivers...
Here in Germany too. The worst drivers are the ones with license plates
beginning with LB- AND driving Audi or BMW.
LB means Ludwigsburg - a city near Stuttgart.
On 1/16/12 6:47 AM, Timeok wrote:
please, before write look in your home than respect other people.
thanks
Luciano
Luciano's point is well taken. Every place has it's idiosyncratic
driving things. Some are more different than others. I found Rome to
be fairly well disciplined for a big
There have been discussions in the past about ways to reduce regulator output
noise or clean-up oscillator or voltage reference power supplies. Here's an
article from Design Ideas in Electronic Design that looks promising. It has
pretty decent rejection even at 1 Hz.
On Mon, Jan 16, 2012 at 12:17 PM, John Lofgren jlofg...@lsr.com wrote:
There have been discussions in the past about ways to reduce regulator output
noise or clean-up oscillator or voltage reference power supplies. Here's an
article from Design Ideas in Electronic Design that looks
On Mon, 16 Jan 2012 12:48:24 -0500, michael taylor mct...@gmail.com
wrote:
On Mon, Jan 16, 2012 at 12:17 PM, John Lofgren jlofg...@lsr.com wrote:
There have been discussions in the past about ways to reduce regulator
output noise or clean-up oscillator or voltage reference power supplies.
On Mon, Jan 16, 2012 at 2:44 AM, Attila Kinali att...@kinali.ch wrote:
But yes, you are right. An FPGA is probably not the right thing. Not because
it is more difficult, but rather because there are less tools and less
documentation available. Hence making it more difficult for the hobbyist
On Mon, Jan 16, 2012 at 2:51 AM, Attila Kinali att...@kinali.ch wrote:
The best you can get out of NTP is about 1ms. While UMTS needs something
in the us range for proper working IIRC.
My NTP server runs at about 2 or 3 uSec level. It is nothing special.
Just an $85 Atom board running Linux
Here is a hand-corrected version:
http://ehydra.dyndns.info/NG/time-nuts/Simple%20power%20supply%20ripple%20rejection%20for%20battery%20systems.zip
- Henry
John Lofgren schrieb:
There have been discussions in the past about ways to reduce regulator output
noise or clean-up oscillator or
When I said on steroids I meant a scheme similar to NTP, but something run by
the wireless companies themselves, not run of the mill NTP.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Mon, 16 Jan 2012 10:54:34
To: Discussion
On 01/16/2012 11:31 AM, Attila Kinali wrote:
On Sun, 15 Jan 2012 16:45:56 +0100
Magnus Danielsonmag...@rubidium.dyndns.org wrote:
A short notice on embedded CPU/MPUs into FPGAs. Using PIC or AVR might
be tempting, but I consider any clone dirty from a rights perspective,
MIPS for instance
Hello, TimeNutters--
Can anyone shed some light on why there is a 15 sec
difference between the large digit time display on my
Lady Heather display and WWV...?
I have been accused of living on another planet-- maybe
it is true after all and that is why there is such a time
difference...??
Mike,
That usually means you're running GPS time instead of UTC.
Check also against http://leapsecond.com/java/gpsclock.htm
/tvb
Hello, TimeNutters--
Can anyone shed some light on why there is a 15 sec
difference between the large digit time display on my
Lady Heather display and WWV...?
I
GPS time v. UTC ?
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GPS has its own time scale. Part of the GPS data stream contains the number
of seconds that GPS and UTC differ by.
-Brian, WA1ZMS
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dan Rae
Sent: Monday, January 16, 2012 7:21 PM
To:
GPS was incepted in 1982, at which point it was equal to UTC ; since then,
15 leap seconds were introduced to UTC, thus the 15-second offset and by
next July 1st, it will be 16 seconds.
The most common use of GPS time (hybrid?) is the Android system time, even
though Samsung Android phones use UTC
Hi
If it's a constant offset, UTC vs GPS.
If it's variable - loading on your PC. I can pretty easily get LH to read 45
seconds off by trying to do to much at once on the machine.
Bob
On Jan 16, 2012, at 7:02 PM, Michael Baker mp...@clanbaker.org wrote:
Hello, TimeNutters--
Can anyone
Hi
Don't forget to toss RAM, Flash, EEPROM, brown out detection, and a clock
oscillator on your board. You get all that stuff built in on a sub $5 / 100 Mhz
micro, but not on a FPGA. I'm not saying you can't take care of all that on a
board, just that you need to plan ahead.
Bob
On Jan 16,
Correct me if I'm wrong, but UTC gets corrected from time to time, but many
things depend on GPS time to be consistent (no jumps), so they can't adjust it.
-Original Message-
From: Brian, WA1ZMS wa1...@att.net
Sender: time-nuts-boun...@febo.com
Date: Mon, 16 Jan 2012 19:25:30
To:
They are used in Russia, and that is pretty much what is happening. I can't
imagine those being used in France...
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Poul-Henning Kamp p...@phk.freebsd.dk
Sender:
On 01/17/2012 02:08 AM, li...@lazygranch.com wrote:
Correct me if I'm wrong, but UTC gets corrected from time to time, but many
things depend on GPS time to be consistent (no jumps), so they can't adjust it.
The way the GPS set of gears works, they need a continuous linear time
internally.
I think the time jumps would be a problem for the GPS customers. Suppose I am
computing speed by differential readings. The jump would be an issue,
especially if time went backwards.
File stamps. Stock timing. Similar problems.
-Original Message-
From: Magnus Danielson
On 01/17/2012 03:18 AM, li...@lazygranch.com wrote:
I think the time jumps would be a problem for the GPS customers. Suppose I am
computing speed by differential readings. The jump would be an issue, especially if time
went backwards.
File stamps. Stock timing. Similar problems.
If you do
On 1/16/12 6:58 PM, Magnus Danielson wrote:
On 01/17/2012 03:18 AM, li...@lazygranch.com wrote:
I think the time jumps would be a problem for the GPS customers.
Suppose I am computing speed by differential readings. The jump would
be an issue, especially if time went backwards.
File stamps.
My description of the problem would have been a thousand times better if
I mentioned monotonicity. It is a classical problem with any discrete
control system. Nonlinearlity is much easier to handle that missing
codes or a lack of monotonicity.
___
Has anyone come across a NTP client that uses native 64 Win 7 code? I've
noticed all the 64 bit versions are running under WOW. I've use Meinberg
now found another source out of Poland.
http://sites.google.com/site/ntpserverspl/ntp-server-time-client-64
This is an ugly thing to search since
Has anyone come across a NTP client that uses native 64 Win 7 code? I've
noticed all the 64 bit versions are running under WOW. I've use Meinberg
now found another source out of Poland.
http://sites.google.com/site/ntpserverspl/ntp-server-time-client-64
This is an ugly thing to search since
Has anyone come across a NTP client that uses native 64 Win 7 code? I've
noticed all the 64 bit versions are running under WOW. I've use Meinberg
now found another source out of Poland.
http://sites.google.com/site/ntpserverspl/ntp-server-time-client-64
I was going to ask, Gary, have you used
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