Hi
Ok, how long will this driving around take?
If you are driving continuously with no GPS for 24 hours, your system needs to
hold 100 ms
for 86,400 seconds. With a fixed frequency offset (rather than drift) that’s
0.1 / 86400 = 1.12 ppm.
If you want to spend money. Modify the clock in one
If you already have a bunch f PCs running NTP why add one more? Just
run the PPS from your GS to one of the existing PCs Anklet t be a
stratum one. It's zero cost. For hold over Orphan mode works well
and will meet your 100 ms requirement. Again, it is zero cost.
On Sat, May 30, 2015 at 3:53
Hi sorry for a possibly OT post.
Has anyone had practical experience with small commercially available time
servers / ntp servers suitable for mobile use in a vehicle.
The use case is I am in need of an accurate (ie. within 100 ms) time source
for several pc's in moving vehicle.Being
I hesitate to say this for fear of provoking a fault, but although I
wouldn't consider them especially good, they're not universal failures. I
have a Pi running a house control and logging system that has an uptime of
230 days despite being largely unattended (I'm not on site - it doesn't get
any
On Wed, 13 May 2015 09:07:44 -0500
bownes bow...@gmail.com wrote:
For the advocates of RPi solutions, I put about half a dozen in to support
some non mission critical infrastructure about a year ago. We are using them
for for logging, reading QR codes, running a vending machine, kiosk web
On 5/24/2015 5:46 AM, Attila Kinali wrote:
On Wed, 13 May 2015 09:07:44 -0500
bownes bow...@gmail.com wrote:
For the advocates of RPi solutions, I put about half a dozen in to support
some non mission critical infrastructure about a year ago. We are using them
for for logging, reading QR
I've noticed that on my RPI as well,
Time stability improved greatly when connected to a simple and well
cooled 7805 voltage
regulator. My RPI (GPS PPS) runs at about +/- 2 uS on a somewhat
medium CPU sytem
load. Good enough for my needs.
Frits
On 5/24/15, Attila Kinali att...@kinali.ch wrote:
Mark-
You might want to look at FEI-Zyfer, and their Nanosync line of products
http://www.fei-zyfer.com/time_sync.htm
I'm not sure about the pricing, but they look to meet your other
requirements
Dave
On Tue, May 12, 2015 at 1:11 PM, Mark Spencer m...@alignedsolutions.com
wrote:
Hi sorry
Might look at this:
http://qulsar.com/Products/Managed_Timing_Engines/MTE_Board_P6X.html
It has PTP, sNTP, comes with a TCXO, OCXO as an option or bring your own
oscillator through the 40 pin connector.
Link
On May 12, 2015, at 10:11 AM, Mark Spencer m...@alignedsolutions.com wrote:
Hi
Thanks for this. This (and the other responses) were the type of answers I
was hoping for.
The budget is probably up to several thousand for a robust COTS product that
won't add significant operational hassles. (Kludging a laptop to run as an
NTP server would be an example of a solution
The quickest no-cost way to get decent hold over if all you need is
about 100 ms is to configure all you NTP users to be part of an
orphan network. When the outside NTP server is lost the island will
look at the set of local NTP systems that agree with each other. So
you in effect use the most
Thanks. Yep running an extra Dc to Dc converter is an option but we already
have access to clean 28 and 13.8 VDC supplies with some extra capacity. We
could likely provide up to a 100 watts of power for this system (I doubt it
would need that much.)
The hold over requirement is in the range
m...@alignedsolutions.com said:
Has anyone had practical experience with small commercially available time
servers / ntp servers suitable for mobile use in a vehicle.
The use case is I am in need of an accurate (ie. within 100 ms) time
source for several pc's in moving vehicle.
What's your budget? I've done this with 1U sized NTP servers from
Symmetricom (S300 and S350 systems) for mobile military use. These are a
few thousand bucks a pop. They're rugged, and held up just fine in places
the military goes.Compared to the rest of the system I was working on, this
was
Hi!
You can try Laureline GPS NTP Server
https://www.tindie.com/products/gxti/laureline-gps-ntp-server/.
I have no personal experience with this box but it seems to satisfy all your
requirements.
Edésio
On Tue, May 12, 2015 at 10:11:52AM -0700, Mark Spencer wrote:
Hi sorry for a possibly OT
On Tue, May 12, 2015 at 7:11 PM, Mark Spencer m...@alignedsolutions.com wrote:
Hi sorry for a possibly OT post.
Has anyone had practical experience with small commercially available time
servers / ntp servers suitable for mobile use in a vehicle.
I don't know about any commercially-available
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