Le 23/07/2011 01:39, Horst Schmidt a écrit :
Ha, you may well ask. The reason to hate DST is given to us in the
southern parts of Australia, by our Queensland cousins:
The problems with DST is :
1. The Cows get very confused and the farmers have problems milking them.
2. The chickens
Yes, it can be done.
Meinberg have a box which accepts a number of sync sources including NTP.
http://www.meinberg.de/english/products/lantime-m300-mrs.htm
Rob K
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jason Rabel
Sent: 22
The problem is: multiple users in a wide area application, where manual
reset of the new time is required - and some don't bother..
I have to process CCTV images from a wide range of separate, individual
organisations, over whom I have no control.
Some of them do a reset, others do not. Twice
I may be reading way to much into the question.
But the goal discipline the local oscillator as an alternate to GPS or WWVB
etc
Further assumption get the same types of services out of the oscillator
Frequency and time plus pulses.
That said if its one ntp source you look at, potentially far down
On 07/22/11 11:48 PM, Perry Sandeen wrote:
List,
Someone asked about surplus rubidium stability.
It was me.
Here are my results.
I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two
were from the Huntsville hamfest.
Before measuring stability, I ran them for a
Yes but zero beat by ear is terrible. Are you talking a scope and I think
thats only 1 X 10-7 as I recall.
Regards
Paul.
On Sat, Jul 23, 2011 at 12:42 PM, Bob Camp li...@rtty.us wrote:
Hi
The simple answer is that normal NTP via the net will give you accuracy
similar to the zero beat to WWV
Hi
There is a range in what NTP will do, just as there is a range in what you can
do via zero beat to WWV. You can get to a ppm or so via zero beat most of the
time. Under good conditions you can get to 0.1 ppm. A practial NTP system
running to servers over the net has roughly the same
On 7/23/11 9:42 AM, Bob Camp wrote:
Hi
The simple answer is that normal NTP via the net will give you accuracy similar to the
zero beat to WWV approach. It will take a few days to get to that level. Much
faster to fire up the radio and use WWV.
Bob
If you aren't somewhere that has no
Hi
Same issue with NTP. As long as you aren't on a link with nasty asymmetry
problems or highly variable delays. There's also the basic do I trust the
server issue. You can indeed trust WWV as transmitted.
Bob
On Jul 23, 2011, at 1:24 PM, Jim Lux wrote:
On 7/23/11 9:42 AM, Bob Camp wrote:
Hi
WWV as transmitted is massively more accurate than it is as received. There
are a lot of NTP servers out there with offsets in the ms to fraction of a ms
range. Even if your path was perfect, those issues would keep you from getting
to the us level. You could indeed build up some custom
Indeed thats why I was saying choose 3 servers.
Now I see in the thread that you can pick pools of servers so thats good.
Then average what they say the time is and drive oscillator.
Wonder if you could look towards the stratum 1 servers.
But that said I could easily believe that it might ot be
I think the original question - is it possible has been answered -
yes, it can be (and has been) done.
The real question becomes what specs can one achieve using a
specific feedback loop (and what is the best method to discipline). After
one year of NTP queries, assume you have a
In message cabbxvhuz+yo+fch1qb3xsuppfpcnpbghoe1jbqsrdgql_c+...@mail.gmail.com
, Chris Albertson writes:
On Sat, Jul 23, 2011 at 10:40 AM, Bob Camp li...@rtty.us wrote:
NTP's clock selection algorithm is pretty good. If you choose a
diverse set of servers then NTP will only use the subset of them
In message 022101cc4970$b24a4b80$16dee280$@com, Jose Camara writes:
After
one year of NTP queries, assume you have a 100ms jitter on the network time,
you could at most tweak your oscillator, based on past performance, to 6E-9.
It is a lot more complicated than that, we need to talk
Some progress since February's discussion:
My m6800 emulator running the 5370 firmware has been moved from the Linux box
to a little 32-bit microcontroller on it's own small evaluation-kit board.
Pictures here: http://jks.com (click on images for larger versions)
You talk to it over an Ethernet
John Seamons wrote:
Some progress since February's discussion:
My m6800 emulator running the 5370 firmware has been moved from the Linux box
to a little 32-bit microcontroller on it's own small evaluation-kit board.
Pictures here: http://jks.com (click on images for larger versions)
You talk
Poul and others?
As usual, I suddenly had a thought ripple across my otherwise placid
cortex, and have forgotten if there was a previous answer on this
thread. What does a NTP server look like on the network? There are now
several small net appliances/eval boards available. I run a program
called
Hi All,
My email address has changed to:
j...@quikus.com
(The change is adding the letters us to the ISP name.)
Please change your address book settings appropriately.
If you have sent me anythying personally since about noon, Thursday, it is
liklely lost and gone forever, so please resend it
Hi Don,
1PPS is useful. 10MHz is not direcly useful. You also need some kind of
timecode, telling ntpd which second the 1pps indicated.
The software side is normally ntpd configured with one of its drivers
(called refclock) for the GPS protocol your receiver has. Again the most
used is probably
Hi Bjorn: Thanks very much for the sources! I was afraid I was not clear
when I sent my question(s). I want to generate a network server rather
than a client. I looked up man ntpd, and it seems at first glance to be
a Linux/Unix client that will sync up a local computer. I want to
generate a
At 06:45 PM 7/23/2011, Don Latham wrote:
than a client. I looked up man ntpd, and it seems at first glance to be
a Linux/Unix client that will sync up a local computer. I want to
generate a network server that ntpd or other clients can access. Perhaps
ntpd is the server.
--
newell N5TNL
ntpd is the server.
Scott: OK. Here's what I get from man ntpd:
The ntpd program is an operating system daemon which sets and maintains
the system time of day in synchronism with Internet standard time
servers.
What I want to do is build a little local net only standard time server
The man
Hi Don,
ntpd is both server and client.
For a ublox with usb i did the following a few days ago.
sudo ln -s /dev/ttyACM0 /dev/gps0
add this to the /etc/ntp.conf
server 127.127.20.0 mode 81
and then
/etc/init.d/ntp restart
This particular setup without 1pps gives a lousy time
ntpd is both a client (getting time info from other ntp servers) and a
server (responding to requests from other clients on the network.)
Access to the server part is controlled by firewall rules and restrict
lines in the ntp.conf file (see example below). An explanation of these
can be
ntpd acts at the same time as a server and as a client, it is included
with all linux distiributions and also FreeBSD and other BSDs. Meinberg
has a pre-compiled ntp for Windows. The Windows Time Service included in
windows xp and 7 is a particular interpretation of microsoft of any
standard
OK, Steve and Bjorn. I will have to get busy and see what I can do.
Thanks very much for your input.
Don
Steve Longcor
ntpd is both a client (getting time info from other ntp servers) and a
server (responding to requests from other clients on the network.)
Access to the server part is
Now all this is fine, and somewhat amusing, but it's not clear there is
any
particular advantage. It's not as though there are piles of 5370s lying
around
with dead or missing CPU cards. Or that it's impossible to deal with HPIB
anymore. One interesting possibility is adding new front-panel
Indeed thats why I was saying choose 3 servers.
Now I see in the thread that you can pick pools of servers so thats
good.
Then average what they say the time is and drive oscillator.
Wonder if you could look towards the stratum 1 servers.
But that said I could easily believe that it might ot be
Hello, Bert -
Not having that much experience, I am wondering whether I could retrofit
their DE-DP22811 http://www.sureelectronics.net/goods.php?id=1164 to make an
8 digits clock having 1/100s:
23 59 59 99
Based in NYC and ideally I would feed it UTC reference, either by GPS minus
15 seconds
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