Hi all,
After a few years of using a Garmin GPS 18x LVC for timekeeping, my
budget now allows for some upgrades and I had a small field day on eBay:
I acquired a Trimble Thunderbolt, two Trimble Resolution Ts, and two
Motorola Oncore UT+s (seconds purchased for spares and testing).
The documentat
2032 is OK, at least with my hardware and you get backup
> for at least 4 years.
Fantastic. Just what I wanted to hear. Thanks for checking.
Also, my apologies for sending a blank reply to the list a moment ago.
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On 3/15/2015 8:46 PM, Chris Albertson wrote:
> I have one of these UT+ receivers. Backup is not a big deal. How long
> will the power be off? Certainly not for days and weeks. The backup
> battery only has to last a few seconds or maybe an hours or two. The real
> problem with batteries is not
On 3/23/2015 5:20 PM, Dan Watson wrote:
> The solution I came up with is very simple but works well. I
> capacitively couple the signal into a MOSFET which triggers a
> monostable 555 circuit. This generates a nice clean ~100ms pulse that
> I send to the PI, and an LED. Because who doesn't like bli
apr-tbolt/
[2]
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:thunderbolt_damping
[3] http://trl.trimble.com/docushare/dsweb/Get/Document-10015/
[4]
http://www.w8bapdstar.info/library/PrecisionClocking/Trimble%20Thunderbolt/Thunderbolt%20Holdover%20Document-8428.pdf
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Pete Step
rarely loses lock, even on satellites in
the southern sky. Since it is reporting a position a few tens of
meters away from its actual location (when used outside the apartment
it computes much more accurate locations), I assume it's because it's
tracking the signals reflected off of a conveniently located building
to the north that allows a partial, reflected view of the southern
sky. Less than ideal, yes, but it works well enough for NTP.
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on. It should run < +/- 5ns one sigma with a good survey.
Will do. I'm doing the 48 hour survey now with LH.
Cheers!
-Pete
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on you described. Time to buy a house, with no tall trees nearby.
> (You may already have heard that time-nuttiness can be expensive ;-)
I won't be looking for a house for at least a few years, but when I do
the skyview is definitely one of the criteria, as is the friendliness
od isn't nearly as good as using a counter
or some other standard, but it's what I have.
Cheers!
-Pete
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re antenna, everything
seems to be working reasonably well -- there's no obvious failures
that I can spot.
Cheers!
-Pete
> Bob
>
>
>> On Apr 21, 2015, at 4:30 AM, Pete Stephenson wrote:
>>
>> On Tue, Apr 21, 2015 at 4:25 AM, Charles Steinmetz
>> wrote:
&g
ctangle on a black background to obfuscate the location.
The reported altitude at my location (which is just a few km outside
downtown Bern) is plausible. After additional surveys it shows as
being closer to 620m.
Cheers!
-Pete
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tim
sting. I have a second identical Oncore UT+ and antenna and will
do some more tests to see if one of them is just being noisy, if it's
a fault of the Oncore module itself, or the antenna.
Many thanks to everyone on the list for the insight and
ported and it'd not be fun to have them stop working.
Cheers!
-Pete
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would they immediately jump back to December 14,
1997 (the Thunderbolt "zero" date)? According to
<https://www.febo.com/pipermail/time-nuts/2014-September/086664.html>
it looks like they'll output the incorrect date as they cross over the
rollover point. That's not good.
conds and can hop forward or back 1024
> weeks without warning).
Ouch. No fun at all.
Hopefully more modern receivers are more clueful about handling
rollovers. At minimum, they should accept user input telling them what
the current epoch is.
Cheers!
-Pete
> - Original Message -
&
as.ch/metas/en/home/fabe/zeit-und-frequenz.html
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On 5/7/2015 1:22 PM, Bob Camp wrote:
> Hi
>
> I guess on a general level:
>
> 1) How do they generate the Swiss version of UTC (fleet of hydrogen masers
> run into to a .. :)
According to their website they use an ensemble of commercial cesium
clocks (they show some photos of HP 5071As) and a h
#x27;s also extremely small and
can be purchased in "hat" form[2] that mounts directly to the Pi.
Cheers!
-Pete
[1] https://www.adafruit.com/products/746
[2] https://www.adafruit.com/products/2324
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Pete Stephenson
On Tue, May 12, 2015 at 7:11 PM, Mark Spencer wrote:
> Hi sor
ction set it uses.
Thank you.
-Pete
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On 5/7/2015 11:38 AM, Pete Stephenson wrote:
> I recently inquired about taking a tour of the METAS time lab[1] and
> they said they'd be willing to show me around.
>
> Is there anything in particular that fellow time-nuts would be
> interested in me asking them a
level. Any offset or
jitter on the nanosecond level will be lost in the noise, so to speak:
the interrupt latency of the Pi will far exceed any nanosecond-level
offset.
Cheers!
-Pete
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To u
d be welcome.
Does anyone have any more details on the "Code" and "Clock Bias"
columns and what they represent? Similarly, what is the "Bias Rate"
(not seen with the Thunderbolt, but Lady Heather reports the bias rate
when using a Resolution T)?
Thanks!
-Pete
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There is code to read the firmware version.
>
> --
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>
>
>
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d I recommend it.
Cheers!
-Pete
[1] http://www.casio.com/products/Watches/G-Shock/GWM850-1/
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The GPS satellites are not geosynchronous; they move with an orbital period
of 12 hours, so their position in the sky is constantly changing. However,
they return to the same position in the sky (modulo repositioning) twice
per day.
It sounds like your Thunderbolt has a saved location that differs
ed for telecom use and so require a little bit of tweaking
to work well with other equipment: for example, the Thunderbolt's 1PPS
signal is intended to connect to a device with 50 ohm impedance using
coaxial cable. If the device it's connected to doesn't present a 50
ohm impedance, the 1PPS s
eally cheap, and it claims 6 nsec (1-sigma) timing accuracy, but yet
> I would still need a more expensive gear to test it.
Shiny. That's not a GPSDO, in that it only provides an accurate PPS
signal when it has reception (there's no holdover capabi
service, but mine is
~17 years old, so its time may have come.
Where can I find a suitable replacement oscillator? Is there a
recommended part number? If the original part is no longer available,
what is a good substitute?
Cheers!
-Pete
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Pete Stephenson
_
e wrong one. Does it need to be the exact
same model number, or are they usually all compatible (assuming that
they are 10MHz and use the same voltage for the oven and other
electronics?
Cheers!
-Pete
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sion.
Power-cycling the Tbolt fixed the problem and I verified that
everything is working ok over both wired and wireless connections.
Thanks to all for the help. Fortunately, it looks like a false alarm.
Cheers!
-Pete
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of limited use.
> I appreciate this is basic stuff compared to the usual discussions but this
> doesn't seem the right question to ask on the NTP lists. Any help
> appreciated. Thanks.
Welcome, and thanks for providing a server in the NTP pool.
Cheers!
-Pete
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Pete Stephenson
On Apr 1, 2016 00:10, "Mark Sims" wrote:
>
> On the subject of RS-232 converter chips... I have had problems running
MAX3232's at 3.6V. Sometimes they work, sometimes they don't. Sometimes
they get freaky hot. The general symptom seems to be no -6V output.
Are the MAX3232's genuine? I've ha
lded (braid-on-foil) with >90dB shielding
attenuation, so I don't think signal leakage from or ingress into the
cables will be a big deal.
The datasheet for the 58532A specifies the out-of-band signal
attenuation is around 60dB at +/- 50MHz.
Many thanks in advance
a worst-case
voltage drop of 0.12V over that distance, again within spec for both
devices.
In short, LMR400 would be a better choice in terms of both signal
attenuation and DC resistance, but the difference is more or less
academic and either cable should work fine.
Cheers!
-Pete
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ing
the surveying would improve the results.
Of course, I could very well be mistaken and would be happy to be
corrected by those more knowledgeable.
Cheers!
-Pete
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To unsubsc
knowledge, so any advice would be
appreciated.
Seem reasonable? Any tips on doing this better?
Cheers!
-Pete
[1] http://www.gammon.com.au/interrupts
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u’ve stored from the overflows, and you have your counts without all the
> CPU load of an ISR for every cycle of 32KHz.
>
> Nigel
>
>> On Jun 27, 2016, at 08:22, Pete Stephenson wrote:
>>
>> Hi all,
>>
>> I have a few Maxim DS3231 temperature-compens
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> These are my opinions. I hate spam.
>
>
>
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(I usually call it "ZERO") to 0x00 to speed up 16
> bit operations.
> Keep data you need FAST in registers in the low page, rather than in RAM.
Thanks! I think that may be a bit beyond my ken for the time being,
but I'll definitely keep it in mind for when I know more.
e useful.
>> > Indeed. I normally use it for NTP.
>>
>> Than you want a second serial port for things like this.
>>
>> Or maybe you can use the parallel port if your system is old enough to have
>> one. I haven't tried it, but I think Linux has a module
On Aug 17, 2016 09:04, "Peter Reilley" wrote:
>
> As a neophyte, I was wondering: rather that trying to discipline an
external
> oscillator to create a GPSDO and produce a precise 10 MHz why not
discipline the oscillator
> of the GPS receiver itself? This could be done with a varactor diode
acro
On 10/4/2016 6:41 AM, Larry Hower wrote:
> Hello to the List:
Hi and welcome!
> After a long and bitter struggle with XP and WIN 10, I am writing to ask
> for some help in solving some problems we have been having in our attempt
> to establish a very accurate time reference for use in EME activit
On Nov 4, 2016 19:45, "Bill Hawkins" wrote:
>
> Satellite TV (Dish, Direct, etc) has been having trouble for 10 hours or
> so, sometimes losing some channels and occasionally all of them.
>
> Fox News is consistently down, so it could have a human cause, but Space
> Weather says we have unusual so
perature in the room is not precisely controlled, but is
reasonably stable over a period of a few hours. There was no external
events (e.g. opening a window, a fan being turned on, etc.) that
correspond to those temperature drops.
Any idea what might be causing this?
Cheers!
-Pete
--
On 12/15/2016 8:35 AM, Mike Cook wrote:
> Hi Peter,
> I also have a T-Bolt monitored by LH5 but am not seeing any glitches like
> yours. No clear idea what may be the root cause, but from your screen dump
> all the metrics are affected so it is not likely to be just a failing temp
> sensor. May
On 12/16/2016 1:54 PM, wb6bnq wrote:
> Hi Pete,
>
> Are you really at an altitude of 645 meters ?
Yes. That's the result of multiple surveys over a week a year or two
ago. I'm pretty sure the altitude hasn't changed since then. :)
I think Lady Heather shows the altitude as that above the WGS84 g
Details here: https://www.bipm.org/utils/en/pdf/vacancy_time_physicist2018.pdf
Looks like a fun position for any time-nuts looking to do this sort of thing
professionally.
Cheers!
-Pete
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TPd. The Oncore driver for NTPd is a
bit chatty in terms of what it logs every second, but that's easy enough
to deal with. They're cheap enough to get a few to play with.
Cheers!
-Pete
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e it. I've found that even with liberal use of
the EL backlight, the battery never gets below the "medium" level during
winter when the watch rarely sees the sun, and then fully charges up
again in springtime.
Cheers!
-Pete
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still running properly.
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edrichshafen June 1 - 3.
>
> Dave
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On Sun, Jan 1, 2017 at 1:28 AM, Bill Beam wrote:
> My LH v5.00 showed leap second as 00:00:60 on a Tbolt. Not good
>
> Previous June 2015 LH v3.10 correctly showed 23:59:60
>
> If interested, I have screen captures.
Now that you mention it, so did mine...
_
2. WAAS and EGNOS only seem to work with GPS. You can enable other,
non-GPS signals, but only GPS will have the corrections applied. The
other, non-GPS signals will be marked as "ready" but won't turn green
and be used in the calculations.
Cheers!
-Pete
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On Tue, May 9, 2017, at 09:52 PM, Ulf Kylenfall via time-nuts wrote:
>
> Gentlemen.
> I am sure this has been asked before...
> I am looking to purchase a GPS receiver modulethat supplies a good/stable
> 1PPS outputwith as little (internally) generated jitter as possible.
How much jitter is tole
happy to provide a link to the specific item I purchased; contact me
off-list for details.
Cheers!
-Pete
[1] https://github.com/heypete/Frequency_Counter_32kHz
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sure holding the device for several hours each
morning.
Cheers!
-Pete
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On Fri, Jul 14, 2017, at 06:56 PM, Brooke Clarke wrote:
> Hi Pete:
>
> AFAICR the DS3231 has a software fine tune. Did you set that before the
> test?
>
> --
> Have Fun,
>
#x27;s any other region of the chip that you'd like
images of, please let me know and I'd be happy to take some more
pictures.
I hope you find this as interesting as I did.
Cheers!
-Pete
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On Thu, Jul 27, 2017, at 09:31 PM, Pete Stephenson wrote:
[...]
> Based on a sample size of one and the markings on the die itself, it
> appears the chip is authentic. The markings on the outside of the epoxy
> package look a bit dubious and not like typical Maxim laser-markings,
).
Cheers!
-Pete
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On Fri, Jul 28, 2017, at 02:36 AM, paul swed wrote:
> Well quite an unpleasant surprise. So after the 30th do the TBolts stop
> working or is it a case of just the wrong date? I know my Hp3801s been
> working just fine and its old. Is the TBolt the sam
don't think it is.
Cheers!
-Pete
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On Thu, Jul 27, 2017, at 10:34 PM, Graham / KE9H wrote:
> Pete:
>
> If you are concerned about someone copying a chip, you can not rely on
> the
> original manufacturers' markings on the die.
>
> I have experience w
On Thu, Jul 27, 2017, at 09:31 PM, Pete Stephenson wrote:
[snip]
> Anyway, the photos are available at http://imgur.com/a/0zudj -- I will
> add more photos from the petrographic microscope tomorrow. I focused
> mainly on the markings on the die that indicated it was, in fact, a
> Maxim
are the die and the
crystal are close enough and in the same package that they could use an
on-die sensor like a diode and call that "good enough"?
Cheers!
-Pete
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On Sun, Jul 30, 2017, at 11:15 AM, Attila Kinali wrote:
> On Sat, 29 Jul 2017 20:32:30 +0200
> Pete Stephenson wrote:
>
> > - There's several square grids of circles-in-squares circuit elements. I
> > have no idea what these are.
>
> If you look closely, these
e scale. I typically see a
span of ~1000-1500 ppt with an RMS of ~100-200 ppt.
To be fair, I'm just using an old Cisco power supply from the eBay
vendor that sold me the Thunderbolt, and my Thunderbolt is sitting on a
block of foam on the floor in a room at the apartment with no particular
On Sun, Jul 30, 2017, at 03:37 PM, Mark Sims wrote:
> A friend of mine is an engineer for one of the biggest manufacturers of
> clock chips and has worked quite a bit on their clock chips and is quite
> familiar with the issues of building consistent ultra low power
> oscillators in a production p
,size=100M 0 0"
[3] The entry in the ntp.conf file is "logfile /tmp/ntp.log", which was
done after making the change detailed at [4]
[4] <http://lists.ntp.org/pipermail/hackers/2010-November/005004.html>
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