Re: [time-nuts] Traveling to the US west coast

uctions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Suggest time-and-tech related locations in Switzerland

edrichshafen June 1 - 3. > > Dave > ___ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > __

Re: [time-nuts] Frequency deviations in Europe affect clocks

l running properly. -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Need a Watch Recommendation

h 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 -- Pete Stephenson ___ time-nuts mailing lis

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

hatty 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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cg

[time-nuts] BIPM looking for a physicist for their time metrology group

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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] current crop of GPS receivers for Rpi/Beaglebone for NTP server/etc

[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> -- Pete Stephenson ___ time-nuts mailing list -- ti

Re: [time-nuts] A look inside the DS3231

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

Re: [time-nuts] Thunderbolt rollover glitch

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 temperature con

Re: [time-nuts] A look inside the DS3231

On Sun, Jul 30, 2017, at 11:15 AM, Attila Kinali wrote: > On Sat, 29 Jul 2017 20:32:30 +0200 > Pete Stephenson <p...@heypete.com> wrote: > > > - There's several square grids of circles-in-squares circuit elements. I > > have no idea what these are. > > If you

Re: [time-nuts] A look inside the DS3231

re 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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] A look inside the DS3231

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 >

Re: [time-nuts] A look inside the DS3231

Cheers! -Pete -- Pete Stephenson 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 where the counterfeiter just ph

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

! -Pete -- Pete Stephenson 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 same issue. W

Re: [time-nuts] A look inside the DS3231

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,

[time-nuts] A look inside the DS3231

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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] DS3231 drift over a year

ice for several hours each morning. Cheers! -Pete -- Pete Stephenson 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, > > Brooke Clarke

[time-nuts] DS3231 drift over a year

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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] A good GPS-Receiver with 1PPS output...

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

Re: [time-nuts] u-blox NEO-M8T GPS initial tracking test

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 -- Pete Stephenson __

Re: [time-nuts] Version 5 wrong leap second

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...

Re: [time-nuts] Temperature weirdness with Thunderbolt & Lady Heather 5

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

Re: [time-nuts] Temperature weirdness with Thunderbolt & Lady Heather 5

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.

[time-nuts] Temperature weirdness with Thunderbolt & Lady Heather 5

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 -- Pete Stephenson

Re: [time-nuts] Satellite TV messed up, how is GPS time

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

Re: [time-nuts] Need Time Help

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

Re: [time-nuts] GPSDO - probably a stupid question.

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

Re: [time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

>> >> The PPS input on a PC may be be 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

Re: [time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

nally, set a register (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

Re: [time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

These are my opinions. I hate spam. > > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Pete St

Re: [time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

add it to what > you’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 <p...@heypete.com> wrote: >> >> Hi all, >> >> I ha

[time-nuts] How to properly characterize 32kHz oscillators manually and with a microcontroller?

://www.gammon.com.au/interrupts -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] How to achieve best results from U-Blox survey-in

that enabling SBAS during 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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Oncore battery

e. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Pete Stephenson ___ time-nuts m

Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

t's 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 -- Pete Steph

[time-nuts] Can a Symmetricom 58532A antenna and ham radio transmitters coexist?

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 for the help. Cheers! -Pete -- Pete S

Re: [time-nuts] Lightning 1, tbolt 0.

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

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

e 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

Re: [time-nuts] Thunderbolt "osc age alarm", where to get replacement oscillator?

id-transmission. 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 -- Pete Stephenson __

Re: [time-nuts] Thunderbolt "osc age alarm", where to get replacement oscillator?

to get the 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 -- Pete Stephenson ___ time-nuts mailing

[time-nuts] Thunderbolt "osc age alarm", where to get replacement oscillator?

, 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 -- Pete Stephenson ___

Re: [time-nuts] syncronized clocks

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 capability), but it seems pretty cool. I like that it e

Re: [time-nuts] syncronized clocks

t 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 signal will "ring". Cheers! -Pete -- Pete Stephen

Re: [time-nuts] A few questions about Tboltmon

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

Re: [time-nuts] New wrist watch

/products/Watches/G-Shock/GWM850-1/ -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

the firmware version. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Pete Stephenson

Re: [time-nuts] Lady Heather Doppler

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 -- Pete Stephenson ___ time-nuts

Re: [time-nuts] PPS for NTP Server - How Close Is Good Enough?

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 -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

[time-nuts] METAS tour report (was Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?)

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 about or (if possible) photographing

[time-nuts] Trimble Thunderbolt firmware chip information

set it uses. Thank you. -Pete -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Small time server for mobile use.

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 -- Pete Stephenson 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

[time-nuts] Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?

/metas/en/home/fabe/zeit-und-frequenz.html -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?

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

Re: [time-nuts] GPS week rollover

. 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 - From: Pete Stephenson p...@heypete.com To: Discussion of precise time

Re: [time-nuts] GPS week rollover

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. -- Pete Stephenson ___ time

Re: [time-nuts] TymServe 2100 1995 Issue - A Kludgy Fix

working. Cheers! -Pete -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Tuning a Trimble Thunderbolt

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 assistance. Cheers! -Pete -- Pete Stephenson

Re: [time-nuts] Tuning a Trimble Thunderbolt

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 -- Pete Stephenson ___ time-nuts mailing list

Re: [time-nuts] Tuning a Trimble Thunderbolt

standard, but it's what I have. Cheers! -Pete -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Tuning a Trimble Thunderbolt

that I can spot. Cheers! -Pete Bob On Apr 21, 2015, at 4:30 AM, Pete Stephenson p...@heypete.com wrote: On Tue, Apr 21, 2015 at 4:25 AM, Charles Steinmetz csteinm...@yandex.com wrote: Pete wrote: On a related note, is it possible to extract any data regarding the training from the unit

Re: [time-nuts] Tuning a Trimble Thunderbolt

with a good survey. Will do. I'm doing the 48 hour survey now with LH. Cheers! -Pete -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Tuning a Trimble Thunderbolt

I do the skyview is definitely one of the criteria, as is the friendliness of the community to radio masts. Cheers! -Pete -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] Tuning a Trimble Thunderbolt

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. -- Pete Stephenson

[time-nuts] Tuning a Trimble Thunderbolt

] http://www.w8bapdstar.info/library/PrecisionClocking/Trimble%20Thunderbolt/Thunderbolt%20Holdover%20Document-8428.pdf -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo

Re: [time-nuts] Z3810AS PPS to a Raspberry Pi

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

Re: [time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

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

Re: [time-nuts] ***SPAM*** Motorola Oncore UT+ firmware upgrade backup power questions

. Thanks for checking. Also, my apologies for sending a blank reply to the list a moment ago. -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

[time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

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