Hi there!
I currently have 2 embedded machines connected to a Garmin 18 LVC and a Sure
GPS board.
They are NTP servers for my company's LAN and I, at the moment, I get sub-ms
accuracy over the LAN.
Everything is fine but I am a bit worried about the GPS reliability because GPS
is ruled by
Hi!
I am building a clock that fetches its time from a local NTP server (GPS
synched machine).
I am using a timer based on a 16 bit interrupt on an Arduino (ATmega328
clocked at 16 MHz).
I am implementing an algorithm to steer the this clock (nothing as
complicated as the NTP algorithms) and
On 24/11/2011, at 11:42, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 10:14:17 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
The clock is set by sending an NTP packet and setting the clock with the
replied timestamp plus half of the round trip time. In a local LAN
Hi Javier!
Thanks for your help.
On 24/11/2011, at 13:16, Javier Herrero jherr...@hvsistemas.es wrote:
El 24/11/2011 13:56, Miguel Gonçalves escribió:
Right! That is what I am doing.
The problem is the drift between adjustments. Arduino's clock is slow 25 ms
every minute
Hi!!
On 24/11/2011, at 13:48, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 12:56:31 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
Right! That is what I am doing.
The problem is the drift between adjustments. Arduino's clock is slow 25 ms
every minute
Hi Atilla!
On 24/11/2011, at 14:42, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 14:21:37 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600
Hi Javier!
On 24/11/2011, at 15:15, Javier Herrero jherr...@hvsistemas.es wrote:
El 24/11/2011 15:21, Miguel Gonçalves escribió:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600 / 256 = 62500 Hz
1 / 62500
about PLL (as someone suggested) I noticed that my
algorithm is a simple PLL.
Cheers,
Miguel
Bob
On Nov 24, 2011, at 7:16 AM, Javier Herrero jherr...@hvsistemas.es wrote:
El 24/11/2011 13:56, Miguel Gonçalves escribió:
Right! That is what I am doing.
The problem
On 16 November 2011 12:27, Jim Palfreyman jim77...@gmail.com wrote:
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
Mine (3 GS running 5.0.1) is apparently within 1 second of UTC which is
good.
By the way... is it possible to build a custom receiver to send
On 16 November 2011 12:47, David J Taylor david-tay...@blueyonder.co.ukwrote:
Folks,
Is it my imagination or is the iPhone under IOS 5 keeping way better time?
I assume it's contacting the mobile towers more often for reading time.
Jim Palfreymam
Lucky Jim!
Certainly doesn't apply to
Hi David!
On 16 November 2011 16:18, David J Taylor david-tay...@blueyonder.co.ukwrote:
Yes, Miguel, someone did mention an NTP synched clock some time back, and
I thought it might be a fun project. Based on an Arduino board IIRC?
Although I don't think it had Wi-Fi by default
I
On 16 November 2011 18:21, David J Taylor david-tay...@blueyonder.co.ukwrote:
It's even worse on the WiFi iPad - there is no way to automatically set
the
time. You can only do it via the Settings page and that only gives you
minute resolution.
The Emerald-Sequoia app is nice, but since it
Hi Paolo!
On 03/11/2011, at 10:44, paolo.mart...@alice.it paolo.mart...@alice.it
wrote:
Dear all
I am an amateur astronomer working in the field of minor planet occultation.
To arrange a precise reference time I am looking for a 1/100 sec LED dispaly
clock GPS based. (LED is usefull for
I really find it funny (to say the least) that in the XXI century people
concentrate on form rather than content when using such an informal medium as
e-mail.
This resembles professional and academic titles that people insist on appending
to their names. These human beings are all about
I might have missed but has the owner of the list said anything yet about this??
Cheers,
Miguel
On 21/09/2011, at 20:09, Robert Darlington rdarling...@gmail.com wrote:
I'm not replying to anybody in particular, just hit the reply key on the
last email.
Guys, this is rather off topic,
Thank you all for all the good advice!
Cheers,
Miguel
On 16 September 2011 00:10, li...@lazygranch.com wrote:
I have a program called Expertgps that seems to be accurate, but uses old
bw imagery.
I think they fixed the bug, but it used to be that the windows and linux
version of google
Hi!
On 14 September 2011 05:36, Mark Sims hol...@hotmail.com wrote:
Lady Heather's precision (nominal 48 hour) survey collects data over
multiple 1 hour periods. With 48 hours of data, multipath and transient
disturbances are minimized. It applies weighted median filters to the data
and
Hi all!
I am installing a timing GPS unit over a new location where I already have a
NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16
seconds its GPGGA string.
I have a log with around 213400 samples. Each line is similar to this one
55817 48494.500 127.127.20.0
Thanks!
I believe then that is best to rely on SynTac position averaging or the
auto-survey feature?
Regards,
Miguel
On 13 September 2011 20:24, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message CAEdntmtEcC=_N1uwvNb2GZqVX8r-AXO81hw+SXF6=
p+kegb...@mail.gmail.com
,
...@gmail.comwrote:
2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com:
Hi all!
I am installing a timing GPS unit over a new location where I already
have a
NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every
16
seconds its GPGGA string.
The Oncore UT+ can does it's
Hi David!
Same here.
I discussed this matter with a friend that did some GIS work a few years
back and we both believe that the unit reporting the wrong position might be
doing this because it's only seeing half of the sky (it is near a window
facing SE) while the other one sees the entire sky.
On 13/09/2011, at 23:10, gary li...@lazygranch.com wrote:
Google maps/earth is sometimes on the money, and sometimes not. Remember,
these are orthorectified images pieced together. That can't be easy. [They
are also on my fecal matter list since they trespassed on my land
(undeveloped)
01:43, Chris Albertson albertson.ch...@gmail.comwrote:
2011/9/13 Miguel Gonçalves m...@miguelgoncalves.com:
I guess the other question is what do you get with Lady Heather? That
is, how does it average your position?
I will try it over this weekend. I have to get a Windows PC. Only Macs
Hi all!
First let me introduce myself: I am a time nut since 1996 (former admin of a
stratum 2 server: bug.fe.up.pt) but college and other priorities kept me
away from my obsession.
The other day I happened to buy a Garmin 18 LVC unit and installed it in the
roof in my company. It has been
satellites will give me
good time. Right?
Thanks again!
Cheers,
Miguel
On 12 September 2011 16:03, Chris Albertson albertson.ch...@gmail.comwrote:
2011/9/12 Miguel Gonçalves m...@miguelgoncalves.com:..
oncore# /var/tmp/sats.sh
8 satellites:0
7 satellites:0
6 satellites: 870
Albertson albertson.ch...@gmail.comwrote:
2011/9/12 Miguel Gonçalves m...@miguelgoncalves.com:
Hi Chris!
Here and on ntp-questions always helping me out! Thanks!
Moving it up to the roof would be difficult. Would have to talk to all
neighbours to ask permission to run a cable
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