Yes, that was exactly my point, There are two kinds of ARM, the A and the
M. "A" is the kind used in you smart phone and the Raspberry Pi and BBB
and these suck up a few watts of power. The M type is made for low power
and could run off a few AA batteries and the battery shelf life would
expire
On Wed, Nov 30, 2016 at 12:42 PM, jimlux wrote:
> I'm looking for a small linux single board - similar to RPi or Beaglebone
> Black, but don't need the HDMI, or video stuff.
> Preferably without weird connectors, and available for wide temperature
> ranges (it's for a data logger/collector in the
First question: How accurate does your local NTP server need to be? If
the answer is "a few tens of milliseconds" then you don't need GPS. All yu
need is a decent Internet connection.
Second. NTP is a VERY light load and certainly does not need to run on a
dedicated computer. Any mail serv
Joe, I'll be glad to give you my whole system. Send me your contact info
on a direct message and it's yours.
-Bob
N3XKB
On Nov 30, 2016 8:58 PM, "Joseph Gray" wrote:
> Does anyone have a spare case for a Soekris Net4501? It looks like
> Soekris no longer sells them.
>
> Joe Gray
> W5JG
> _
On Wed, Nov 30, 2016 at 12:14 PM, Gary E. Miller wrote:
> Yo Michael!
>
> On Wed, 30 Nov 2016 14:21:39 +
> Michael Rothwell wrote:
>
> > ... was just announced.
> > https://cloudplatform.googleblog.com/2016/11/making-
> every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
>
> I s
Having a full blown os is nice when all the processor is responsible for is
house keeping and storage. You also get plenty of RAM for buffering prior
to writing to persistent storage, like an SD card. That said I have found
SD cards to be fusy, at least the microchip FAT libraries. And write cycle
Does anyone have a spare case for a Soekris Net4501? It looks like
Soekris no longer sells them.
Joe Gray
W5JG
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If you are going to go battery powered, I would also recommend staying away
from Linux, go with something like a 32 bit PIC32MX or PIC32MZ. Full
Ethernet stack, RTOS if you need it, can do deep sleep down into the
microamp range when not active.
--- Graham.
On Wed, Nov 30, 2016 at 8:35 PM, Gary
There do seem to be a lot of small SBCs out there. I have used boards from
Technologic Systems, http://www.embeddedarm.com
and EMAC, Inc, http://www.emacinc.com
They have numerous models for you to look though. Some various features:
- SBC or SoM/CoM on baseboard
- Various form factors includin
Before joining time-nuts I had purchased a QLG1 GPS receiver kit from
www.qrp-labs.com. It was $23 plus a few bucks for shipping. I installed the
patch antenna as it suited my purposes, but there is the means to omit the
patch antenna and use an SMA to go to the antenna of your choice. QRP-La
On Wed, 30 Nov 2016 16:57:10 -0800
jimlux wrote:
> Power consumption - it's going to be battery powered
> I've been looking through the literature, and you can power down some of
> the chips on most of these things.
If power consumption is an issue for you, then I would advise against
going for
On 11/30/16 3:26 PM, Hal Murray wrote:
jim...@earthlink.net said:
I'm looking for a small linux single board - similar to RPi or Beaglebone
Black, but don't need the HDMI, or video stuff.
Don't limit your search to things that doen't have what you don't need. It
may be cheaper to get a high
Hi
There are a nearly infinite number of ARM based modules and boards. They all
are very much
a “same / same” sort of thing. They are far more alike than they are different.
That’s not to say
that they are interchangeable, far from it. The issue for low volume is often
more the toolchain
(an
On Wed, 30 Nov 2016 12:42:51 -0800
jimlux wrote:
> I'm looking for a small linux single board - similar to RPi or
> Beaglebone Black, but don't need the HDMI, or video stuff.
> Preferably without weird connectors, and available for wide temperature
> ranges (it's for a data logger/collector in
Hi
Most of this is “I have an idea, I can (loosely) connect the idea to big
volume, give me *big* piles of money”.
Trying to work it out on a technical basis is not going to work very well ….
Bob
> On Nov 30, 2016, at 6:49 PM, Jay Grizzard
> wrote:
>
> On 2016-11-30 13:45 , André Esteves w
On 2016-11-30 13:45 , André Esteves wrote:
Millimeter accurate GPS in smartphones and self driving cars would
result from tiny atomic clocks
I saw a different form of this article a month or so back, and for the
life of me I can't figure out how having a tiny atomic clock helps GPS
accuracy at
tn1...@nic.fi said:
> I wonder what this stupid "leap smear" will do to NTP driftfiles. ...
There was a report on that area mentioned here a while ago.
As long as the smearing is slow enough, the client servers easily track the
drift. There is a bump in their drift, but it's not a problem for
Fits very nicely into a 5370 in fact. :)
> On Nov 30, 2016, at 17:12, Graham / KE9H wrote:
>
> The BeagleBone Green is a BeagleBone Black with the HDMI and video chip
> removed.
>
> Mouser Part number *Mouser Part #: *713-102010027, $39, In stock.
>
>
> Makes a great little headless server.
>
jim...@earthlink.net said:
> I'm looking for a small linux single board - similar to RPi or Beaglebone
> Black, but don't need the HDMI, or video stuff.
Don't limit your search to things that doen't have what you don't need. It
may be cheaper to get a high volume part and ignore the sections
Michael Rothwell kirjoitti:
... was just announced.
https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
I wonder what this stupid "leap smear" will do to NTP driftfiles. Only
Google may be stupid enough to grow one second lastin
The BeagleBone Green is a BeagleBone Black with the HDMI and video chip
removed.
Mouser Part number *Mouser Part #: *713-102010027, $39, In stock.
Makes a great little headless server.
--- Graham
==
On Wed, Nov 30, 2016 at 3:51 PM, Clint Jay wrote:
> Raspberry Pi compute module? Maybe even
Raspberry Pi compute module? Maybe even a Pi Zero?
On 30 Nov 2016 21:47, "Adrian Godwin" wrote:
> The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB,
> cost very little and will usually run wrt54g Linux. Can be rather short on
> memory though.
>
> On 30 Nov 2016 8:43 p.m.
Millimeter accurate GPS in smartphones and self driving cars would
result from tiny atomic clocks
--
http://www.nextbigfuture.com/2016/11/millimeter-accurate-gps-in-smartphones.html
https://arxiv.org/abs/0707.4624
including energy harvesting, bio-sensing and quantum nanoelectronics.
They are pro
On 11/30/2016 3:35 PM, Gary E. Miller wrote:
> Not true. NTP has provision for arbitrrary extensions to an ntp packet.
>
> See RFC 5905. https://www.ietf.org/rfc/rfc5905.txt section 7.3:
HA! ntp (the implementation) doesn't follow the RFC, which says that ntp
(the protocol) is supposed to count
The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB,
cost very little and will usually run wrt54g Linux. Can be rather short on
memory though.
On 30 Nov 2016 8:43 p.m., "jimlux" wrote:
> I'm looking for a small linux single board - similar to RPi or Beaglebone
> Black, but
I have found that the cheap V.KEL SIRF=III modules (I paid $15-$20 for three)
have excellent indoor performance with their built-in patch antenna. They
don't do GLONASS. I even get indoor tracking with the module sitting on the
ground floor of a 2 story hose with the patch antenna facing the
Yo Tom!
On Wed, 30 Nov 2016 13:06:06 -0800
"Tom Van Baak" wrote:
> From Gary Miller:
> > You gotta start sometime. Now is a good time. This is not the
> > first time Google has done this, and certainly will not be the
> > last. It had bad consequences last time and they did not learn
> > from
Yo Poul-Henning!
On Wed, 30 Nov 2016 21:01:44 +
"Poul-Henning Kamp" wrote:
>
> In message <20161130125857.7229b...@spidey.rellim.com>, "Gary E.
> Miller" writes :
>
> >Not 'odd'. Fully specified in the RFC. Anyone that did not
> >implement the spec gets what they deserve.
>
>
Hi
A few basics:
1) GPS receivers really can’t / don’t do a lot about multipath. The newer
devices with a lot
of correlators help a bit, but that’s about it. Simply put - newer is better.
2) Because of near the omnidirectional nature of GPS, antennas don’t do a lot
for multipath. They
can hel
Yo MLewis!
On Wed, 30 Nov 2016 16:11:05 -0500
MLewis wrote:
> I'm after a time solution for my personal computer. It looks like I
> need:
I suggest you take this over to NTPsec: de...@ntpsec.org, or
on gpsd: gpsd-us...@nongnu.org
They are working on a HOWTO that does exactly what you want.
Yo
(resending as I tried posting in html...)
Hello,
I'm a novice at time issues. I've been gathering info and I think I'm
ready to start asking questions.
I'm after a time solution for my personal computer. It looks like I need:
*a standalone box to be my own local personal NTP server (so t
>From Gary Miller:
> You gotta start sometime. Now is a good time. This is not the first
> time Google has done this, and certainly will not be the last. It had
> bad consequences last time and they did not learn from that.
This is not the fault of google. The big players will continue to innov
In message <20161130125857.7229b...@spidey.rellim.com>, "Gary E. Miller" writes
:
>Not 'odd'. Fully specified in the RFC. Anyone that did not implement
>the spec gets what they deserve.
Gary,
Actually, anybody who does implement the spec *precisely* gets a lot
of things nobody should
Yo Bob!
On Wed, 30 Nov 2016 15:42:58 -0500
Bob Camp wrote:
> I believe the point was: If you start tossing around packets that are
> odd sized, it is likely to break a lot of existing code.
Not 'odd'. Fully specified in the RFC. Anyone that did not implement
the spec gets what they deserve.
On Wed, Nov 30, 2016 at 2:21 PM, Michael Rothwell wrote:
> ... was just announced.
> https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
Obvious outcome is obvious. Leap smear prevented faults between google
systems but then created
Yo Poul-Henning!
On Wed, 30 Nov 2016 20:42:17 +
"Poul-Henning Kamp" wrote:
>
> In message <20161130123506.63853...@spidey.rellim.com>, "Gary E.
> Miller" writes :
>
> >Not true. NTP has provision for arbitrrary extensions to an ntp
> >packet.
>
> Good luck getting that through
Hi
I believe the point was: If you start tossing around packets that are odd
sized, it is
likely to break a lot of existing code.
Bob
> On Nov 30, 2016, at 3:35 PM, Gary E. Miller wrote:
>
> Yo Poul-Henning!
>
> On Wed, 30 Nov 2016 20:31:09 +
> "Poul-Henning Kamp" wrote:
>
>>
I'm looking for a small linux single board - similar to RPi or
Beaglebone Black, but don't need the HDMI, or video stuff.
Preferably without weird connectors, and available for wide temperature
ranges (it's for a data logger/collector in the field)
What's out there?
There's BBB in industrial f
In message <20161130123506.63853...@spidey.rellim.com>, "Gary E. Miller" writes
:
>Not true. NTP has provision for arbitrrary extensions to an ntp packet.
Good luck getting that through firewalls after the lastest rounds
of NTP amplification attacks...
--
Poul-Henning Kamp | UN
Yo Poul-Henning!
On Wed, 30 Nov 2016 20:31:09 +
"Poul-Henning Kamp" wrote:
>
> In message , Bob Camp
> writes:
>
> >> I would support an RFC to mark the type a time an chimer is
> >> servings. Not only smeared and UTC, but also TAI, UT, UT0, UT1,
> >> UT2, ET, TDT, TDB, TT, TCG, TC
Yo Bob!
On Wed, 30 Nov 2016 15:26:34 -0500
Bob Camp wrote:
> > I would support an RFC to mark the type a time an chimer is
> > servings. Not only smeared and UTC, but also TAI, UT, UT0, UT1,
> > UT2, ET, TDT, TDB, TT, TCG, TCB, GPS, etc…
>
>
> That would probably be a good point to make on t
In message , Bob Camp writes:
>> I would support an RFC to mark the type a time an chimer is servings.
>> Not only smeared and UTC, but also TAI, UT, UT0, UT1, UT2, ET, TDT, TDB,
>> TT, TCG, TCB, GPS, etc…
>
>That would probably be a good point to make on the NTP list :)
>
>The gotcha is
Hi
> On Nov 30, 2016, at 3:14 PM, Gary E. Miller wrote:
>
> Yo Michael!
>
> On Wed, 30 Nov 2016 14:21:39 +
> Michael Rothwell wrote:
>
>> ... was just announced.
>> https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
>
> I
Yo Michael!
On Wed, 30 Nov 2016 14:21:39 +
Michael Rothwell wrote:
> ... was just announced.
> https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
I sort of see where they are coming from, but this will cause problems.
The NT
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In message <706C789A8B5440B3911A8A02C93E3E54@Alta>, "David J Taylor" writes:
>Hope it doesn't mess up too many folk. It's completely against the
>recommendations, of course.
But in difference from these, it actually works.
Trust me, they'll get thousands of users...
--
Poul-Henning
Subject: [time-nuts] Google public NTP service
... was just announced.
https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
___
One "service" I will /not/ be using.
Hope it doesn't mess u
Hi
The highest sensitivity approach to jitter measurement is to look at phase
noise with a phase noise test set. You
don’t mention jitter bandwidth or what sort of cleanup you have after the DDS.
That will all impact the degree to which
phase noise is a useful indicator.
Likely the quickest w
... was just announced.
https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1
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I just posted this on the HP Equipment forum. Someone reading it
there suggested I contact timenuts because what I want to do is
effectively an accurate time stability measurement.
I am attempting to look at the phase jitter between two synchronized
DDS rf sources, one at 3 Ghz and one at 750
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