Re: [time-nuts] Affordable PoE 6-digit time displays?

From: Bob kb8tq Hi I think this is one of those really small market items. You can probably cobble one together from bits and pieces for less than you can buy a good one. Bob === For example: http://www.satsignal.eu/raspberry-pi/DigitalClock.html 73, David GM8ARV

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Anyone who is using one (or both) of these, and/or folks who have a logical opinion: [] There's more... but this is a good start. Just want to try and get parts on the way. Have to build a separate outboard regulator for the timing GPS antenna, too. Thanks! Clay Autery

Re: [time-nuts] TCVCXO Adjustment

Hi NTP will give you “millisecond" level accuracy / stability. If you want to set an oscillator to 0.1 ppm, you will need to run for over 10,000 seconds. It is not uncommon to have things out in the 10 ms range. That would put you at 100,000 seconds. In more common units, a couple of hours to

Re: [time-nuts] Cheap jitter measurements

Hi, Yes, but isn't generating pulses OUT of a PC with low latency/jitter one of the difficult issues? If we (somebody smarter than me...) flip this around and modify a copy NTP to grab the QueryPerformanceCounter value when it gets a PPS pulse and log that count, don't we now have a way to

Re: [time-nuts] Cheap jitter measurements

There is a program for the RPi which handles the PPS input for NTP and can produce an output on a GPIO pin here: https://vanheusden.com/time/rpi_gpio_ntp/ but it's user-mode so of limited use. Perhaps the OP could adapt it? Cheers, David -- SatSignal Software - Quality software written to

Re: [time-nuts] Lady Heather v6.0 Beta for Windows .EXE file

From: Mark Sims [] I've put a copy of the Windows .exe and documentation comments on EEVBLOG: http://www.eevblog.com/forum/metrology/lady-heather-v6-beta-for-windows-exe/msg1434005/#msg1434005 [] Thanks! David -- SatSignal Software - Quality

[time-nuts] UK government study on: Satellite-derived Time and Position - Critical Dependencies

UK government study on: Satellite-derived Time and Position - Critical Dependencies https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/676675/satellite-derived-time-and-position-blackett-review.pdf Seems quite comprehensive, and may be of interest to GNSS users. 1.6

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

Dear fellow nuts, I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm looking for a good and possibly affordable timing GPS receiver. [] Am I overlooking something or missing interesting options? Cheers, Paride IZ3SUS Paride, As

Re: [time-nuts] Time stamp degradation being added in javascript

From: David Possibly not of immediate concern to time-nuts but an article had some trigger words for them in the initial fixes to the much publicised problems with Intel/AMD/ARM etc : "After these changes, the time stamp returned by |performance.now| will be less precise due to lower

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

From: David C. Partridge ? RasPi-4? Not released until 2019 AFAIK ... I have RasPi-3 === My Raspberry Pi #1 and Raspberry Pi #4. See: http://www.satsignal.eu/mrtg/performance_ntp.php Cheers, David -- SatSignal Software - Quality software written to your requirements

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

From: Mark Sims I have an analytical balance that reads down to micrograms. The weigh chamber is surrounded by three layers of IR absorbing glass so that radiated body heat does not induce convection currents in the air. I worked on a balance that had nanogram resolution (mostly wishful

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

I have beagles, but others have pis. There seem to be dozens of GPS receivers out there in a variety of form factors. What's the current "best" inexpensive choice for run of the mill time-setting/1pps that's a "catalog" item Plenty of online "how-to" from 2013 and 2014, but we here on the

Re: [time-nuts] How well does GPS work in the Arcitic?

The satellite orbits only go so far north? If you are far enough north for that to be a problem, can you pick up the satellites across the pole? I have several days of NMEA log files from 68 N. I think it will be simple after I have done it, but it may be a while before I get time to plot

Re: [time-nuts] Can Lady Heather set PC time directly from aTrimbleThunderbolt?

Thanks to everyone for the replies, so basically would you say that with a permanent internet connection I should forget using GPS time to set the PC clock and just use Meinberg or NTP (which is what I am currently using and seems to work just fine)? Best Regards,

Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?

From: Clay Autery I use Meinberg's NTP for Windows... and their Monitor program. https://www.meinbergglobal.com/english/sw/ntp.htm 73, === Clay, That's a Windows compile of the source I mentioned:

Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?

Apologies for the off list reply. The site www.davehart.net does not appear to be online any more. Would you know of an alternative source for the Dave Hart Windows port of NTP ? Cheers Arne Arne, The official distribution contains a Windows port which

Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?

I use an NTP client to set my Windows 7 64 bit PC time for digital mode amateur radio activities, but I was wondering if my Trimble Thunderbolt and Lady Heather can do the same job? If it can, how do I do it please, and can the PC show GMT and not UTC, and finally does the date glitch affect

[time-nuts] Problem behind failing Galileo clocks identified

"Investigators have uncovered the problems behind the failure of atomic clocks onboard Galileo satellites, the European Commission said." See: http://galileognss.eu/problem-behind-failing-clocks-identified/ May be of some interest. Cheers, David -- SatSignal Software - Quality software

Re: [time-nuts] GPS splitter

"David J Taylor" <david-tay...@blueyonder.co.uk> wrote: .. or a ready-made, and smaller item: http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696 I use this successfully for 1.09 GHz ADS-B splitting. Please be aware that this is a Wi

Re: [time-nuts] GPS splitter

Hi There is a poorman's way of making a -3dB splitter using lengths of cable of characteristic impedance equal to the system impedance. [] John Ponsonby .. or a ready-made, and smaller item:

Re: [time-nuts] Anthorn eLoran

Subject: Re: [time-nuts] Anthorn eLoran Is there software available to receive these signals using an SDR device such as the RSP-1 or 2, AirSpy with SpyVerter, or whatever? I don't have a dedicated receiver but it might be fun to see something, being not very far away from Anthorn. Thanks,

[time-nuts] Reliable time from GNSS signals

Those interested in GNSS and the law (what country's?) might like to see this article entitled: "Reliable time from GNSS signals" from the March/April 2017 Inside GNSS magazine, page 38. As far as I can determine, the URL is: http://online.qmags.com/GNSS0317#pg39 It was less technical than

Re: [time-nuts] Sinlge ADC multi-band receiver

BTW: Rodriguez' PhD thesis[2] (which is the basis of navipedia) gives a very nice overview of the trade-off's that went into the Galileo signals and gives a few hints where future GNSS signals could further improve things. Attila Kinali [2] "On Generalized Signal Waveforms for Satellite

Re: [time-nuts] more of a time distribution question

From: Hal Murray That should work. I haven't found a GPS with PPS for the beaglebone. What level of accuracy do you want? If you only need 100 ms or so, then a normal junk GPS (no PPS) on USB should work. == This works with the BeagleBone:

Re: [time-nuts] Best Chance GPS module

On Dec 1, 2016, at 7:44 AM, David J Taylor <david-tay...@blueyonder.co.uk> wrote: Venus838LPX-T. Seems to go into a non-locked state for a proportion of the time but still emits a PPS signal, which increasingly deviates from true UTC. That's using a 25 mm square 28 dB active patch a

Re: [time-nuts] Smart Phone time display accuracy...?

From: Jeremy Nichols I have that app but don't see an option to display "the offset between NTP time and the device's internal clock." Please guide me. Jeremy = Jeremy, Top right corner of the display. My iPad Pro 9.7 shows +0.003 at the moment. See:

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPSdecoding cards

From: Chris Albertson [] What you care about is the uncertainty of this process NOT the offset but the standard deviation of the offset. .. and in the absence of numerical values of the SD, well-scaled graphs of offset can show the variation in offset quite well.

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Hi, I was wondering whether there is some data/information available on the claimed +/- 100 ns jitter? Regarding the PPS -> USB (using the CTS line of a FTDI FT232R), I plotted, using some lines of Python, the time offset as attached. Just to get an overview how it is 'worst case', i.e., user

Re: [time-nuts] how many seconds out does GPS discipline being to improve Rubidium stability?

From: gkk gb Hello experts, I need a Rubidium frequency reference for my company, and wonder if I also need to GPS discipline it. I characterize crystal-based OCXOs for ADEV, MTIE, and TDEV, and my longest measurement time is 100,000 seconds (28 hours). []

Re: [time-nuts] 10MHz to 25MHz

From: Charles Steinmetz Try this: Best regards, Charles = Not for the UK, it seems. Is it on YouTube? Could someone upload it somewhere? Thanks, David -- SatSignal Software -

Re: [time-nuts] Temperature (environmental) sensors

I like the Bosch BME280 conneced to a Raspberry PI. https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md -- Björn Some performance plots are

[time-nuts] Leap second briefly catches out computer firm

Leap second briefly catches out computer firm - Web firm Cloudflare was briefly caught out by the leap second added to the end of 2016. http://www.bbc.co.uk/news/technology-38488246?ocid=socialflow_twitter Not the first, and won't be the last! Happy New Year! David -- SatSignal Software -

Re: [time-nuts] A Leap Second is coming

Is everybody setup to watch it and collect lots of data? Anybody have a list of tools/toys for collecting data? An old favorite: www.cl.cam.ac.uk/~mgk25/time/leap/test/timelog.c = Some tools here, to see which NTP servers are announcing the event:

Re: [time-nuts] u-blox LEAH M8F

I was slightly imprecise in my previous posting about ubx timing modules and a few people have raised queries in the list or by email. What I should have said is that this module is designed as a precise low-noise /frequency /reference so it directly generates the 30.72 MHz needed in LTE

Re: [time-nuts] 1PPS users?

From: jimlux And pretty much any of these will ingest a 1pps + message, rather than, say, a 10 MHz reference. Why not just use the raw GPS 1pps (which is typically good to a few tens of ns)? GPS coverage/outage and random variation in the GPS 1pps A lot of them use a disciplined oscillator to

Re: [time-nuts] GALILEO online: any changes seen?

From: Mark Sims Fire up Lady Heather v5, start it with the -rxu option to speak Ublox binary. Enter the keyboard command SG. That will let you see which GNSS systems are in use and let you change them. My M8 (fw 3.01) lets me select Galileo, but I see no Galileo sats. To get the

Re: [time-nuts] GALILEO online: any changes seen?

David, several of your satellite count graphs show a slow upward trend throughout this calendar year, with a bump up for the month of October, falling back down for part of November, then another step up at the beginning of December. http://www.satsignal.eu/mrtg/performance_gps.php?period=year

Re: [time-nuts] GALILEO online: any changes seen?

Dear all, the GALILEO system is supposed to go online today (at least for initial operational capability). Does anybody of you has a GALILEO compatible receiver and sees already a difference? Best regards, Achim Achim, I'm not sure whether the signals were turned

Re: [time-nuts] Lady Heather Ver 5 Problem

To the group. I have installed LH in the program folders of XP and also in other directories they all seem to work as long as I clearly tell LH the place to look. Regards Paul WB8TSL = Paul, with Windows-7 and later directory protections have been

Re: [time-nuts] Lady Heather Version 5 is now available

Mark, While I have not (yet) used Lady Heather, I plan on doing so as soon as I can get my GPSDO. However, I do have a feature suggestion. You have an option that allows dates to be expressions in the European format DD-MM- vs. the US format of MM-DD-. What about an option to express

[time-nuts] OT: 4-way amplfied GPS splitter wanted - UK source?

Perhaps this is not too off-topic for the moderators? I'm looking for a 4-way (or more) amplified GPS splitter, with N-type connections. Yes, I can see some on eBay but they all seem to be US sourced with rather large postage charges. I'm wondering whether anyone in the UK might have one

Re: [time-nuts] Lady Heather Version 5 is now available

Hello Mark, many thanks for your immense and invaluable work! I am using the trimble thunderbold together with LH version 3 all the last years with success, I like your program very much. I downloaded and installed today the version 5, but I have some problems because it looks like my windows 7

Re: [time-nuts] Lady Heather Version 5 is now available

Lady Heather version 5.0 is now available for download from: http://www.ke5fx.com/heather/readme.htm Many thanks to John Miles for hosting the distribution and his work on the Windows installer, PDF documentation file, readme file, and bring an all-around good guy. Heather now has some

Re: [time-nuts] Best Chance GPS module

-Original Message- From: MLewis Sent: Saturday, December 3, 2016 3:29 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Best Chance GPS module So much to absorb and learn from what people have responded with. Thanks all!

Re: [time-nuts] RPi/ beagle bone-like computer without video

From: jimlux The Raspberry Pi OS includes a free MATLAB licence, as I expect you already know. yes, but "Note that you cannot install MATLAB as a standalone application or execute MATLAB code locally on a Raspberry Pi. To develop applications for the Raspberry Pi to be used in standalone

Re: [time-nuts] RPi/ beagle bone-like computer without video

From: jimlux We're processing several thousand samples, received over a serial port or USB in a few seconds. The algorithm (in Matlab, hence the need for Linux) grinds for around 30 seconds to produce the output. === The Raspberry Pi OS includes a free MATLAB licence,

Re: [time-nuts] Best Chance GPS module

Yes, that's what I thought as well, until I bought and tested one and found out that - in practice - they need an even /better/ set of GPS signals than a simpler position GPS/PPS. Since that's not my experience (even with poor antenna position) I'm curious which unit you were using.

Re: [time-nuts] Best Chance GPS module

From: MLewis I'm hoping a timing GPS module, with their claims of being successful (to the precision I need anyway) on few, or even a single sat. Finger's crossed. == Yes, that's what I thought as well, until I bought and tested one and found out that - in

Re: [time-nuts] Best Chance GPS module

Hello, I'm a novice at time issues. I've been gathering info and I think I'm ready to start asking questions. [] A ublox NEO-M8T with an active timing antenna (GPS | GLONASS ?) seems to be my best chance of being successful at my location. Questions: *Is there a more suitable GPS module

Re: [time-nuts] Google public NTP service

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

Re: [time-nuts] UCCM arrived

Hello to all, I connected the unit to a 11m of H-155 cable(assumed 4.79dB loss "worst case" at 1.5GHz), thrown the GPS antenna on the balcony horizontally and this is what I got: [] - Given the attenuation (less than 5 dB) do I really need to change the cable for something better? []

Re: [time-nuts] How can I measure GPS Antenna quality?

From: Mark Sims Yes. It also works with GPSD so should be able to work with any device that GPSD supports. It also works with most common GPS receiver native binary languages and provides full device control. --- Thanks, Mark. I look forward to playing with a copy. I

Re: [time-nuts] Time, NTD, IoT and bug fixes

Given recent discussions of IoT, NTP and wall clocks, this may be of interest http://www.theregister.co.uk/2016/11/23/ntp_patch_time_rolls_around_again/ And the vulnerabilities: http://www.kb.cert.org/vuls/id/633847 Clint. === Folks needing updates for

Re: [time-nuts] How can I measure GPS Antenna quality?

The interpolation does not spread the data to where sats have not appeared... what it effectively does is intelligently make the dots bigger... but only along the azimuth "axis". For each elevation angle, it starts at azimuth 0 degrees and searches forward until it sees a point with signal.

Re: [time-nuts] Do reflections up/down the antenna cable cause aproblem with GPS?

From: Dr. David Kirkby (Kirkby Microwave Ltd) Anything not immediately absorbed by the GPS receiver is going to be reflected back up the coax, and could be reflected multiple times. = Only if the sending impedance of the LNA in the antenna is well off

Re: [time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

Hal, Thanks, this had me look closer at the outputs and not all RS232 chip breakout boards shift all signals, it seems to be 4-6 lines at most. I've seen some MAX3232 (RS232 to TTL) converters, but the better ones only shift Rx, Tx, CTS, RTS, VCC and GND. If I read what was suggested here

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

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 solar activity. I no longer have GPS time receivers,

Re: [time-nuts] Temp/Humidity control systems?

From: jimlux You can buy the smallest "window" airconditioner and "plumb" it to your chamber (I used dryer vent hose, cardboard, and lots of duct tape) Attached is a plot temperature and RH of an insulated box about 1.2 meter wide, 2 meters tall and 60 cm deep, filled with 100 or so 750 ml

Re: [time-nuts] Temp/Humidity control systems?

I may have the opportunity to build a small "clock room" and am considering whether I could make it an environmentally controlled space. I'd like to learn about the options for doing this. The space would probably be 6x8 feet or so, in a basement with one outside wall. Can anyone point me to

Re: [time-nuts] leontp offset

More followup: I set up and configured a brand new xenial box using ntp, and let it run for a day (approx 7 hours). Here are the ntpq -p from that: $ ntpq -p remote refid st t when poll reach delay offset jitter

Re: [time-nuts] Linux PPS clues?

From: Attila Kinali [] Yes, but in embedded there are huge differences between the various boards and processors. While an rpi is a great device if you want to do graphics based stuff, it's a very poor choice for control and measurment applications, or anything that needs fast I/O [] Attila

Re: [time-nuts] Need Time Help

From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Lady Heather has support for setting the system clock from the GPS receiver. The next release has support for analyzing and compensating for the GPS / system / com port message delay. It does not use the 1PPS signal.

Re: [time-nuts] 1PPS to 32.768 khz

First let me say this is first time I have posted to the group so go easy on me. :) Secondly I want everyone to know that you guys make me feel so NORMAL for wanting to use and understand accurate timing devices. I thought there was something seriously wrong with me now I know there are others

Re: [time-nuts] leontp offset?

Hi all, I'm checking out the leontp ntp time server (leontp.com). After a week of use I am getting the following ntp -q output: $ ntpq -pn remote refid st t when poll reach delay offset jitter ==

Re: [time-nuts] Need Time Help

From: Graham / KE9H Larry: [] First, the reflector has already jumped in and helped you with the definition of absolute time. You can get single digit millisecond accuracy (with some caviats and bewares) from NTP, for stations at different locations. You should be able to get single digit

Re: [time-nuts] Need Time Help

From: Hal Murray david-tay...@blueyonder.co.uk said: You can use a GPS puck or equivalent with PPS output to get the sort of accuracy you need. ..: PPS output is only half the battle. You also have to get it into the system that needs it. A modem control signal on an old fashioned serial

Re: [time-nuts] Need Time Help

Hello to the List: 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 activities. We are hoping to achieve less than 5ms deviation, although

[time-nuts] OT: One hundred years since Ireland's own time zone came to an end

David Malone (one of our members, I believe) gave a talk the other day: "It is one hundred years, today, since Ireland own time zone came to an end and moved to use the same time as Great Britain." See: https://twitter.com/dwmal1/status/782156281440264192 The slides:

Re: [time-nuts] Clean 10 MHz ref

True for the first frequency. The second statement may or may not be true, it was not clear in the original description of the device. When I wrote Leo and asked about a specific second frequency he did a manual calculation and sent me the parameters. From another email reply: "Sorry,

Re: [time-nuts] Need 10 MHz for DSN space-probe hunting

Mike already mentioned he has a Thunderbolt. That product you referenced only has phase noise measurements down to 100Hz offset, but comparing to the Thunderbolt phase noise measurements that Tom posted at the link below, a Thunderbolt running on a good quality linear power supply has about 20dB

Re: [time-nuts] Clean 10 MHz ref

It is non-trivial to set other than a few embedded frequencies with the existing software. There has been a veiled promise of improved software that remains unfulfilled. It is a GPSDO, although the internal oscillator is a TCXO, not an OCXO. Mine runs on even a laptop USB port. Wes

Re: [time-nuts] What's the best Windows 10 ntp client?

Well then the ntpd program written into MY Windows CONTROLLED by the program represented in the attached image It says it is a Monitor, but it ALSO controls how NTP works on MY machine... It keeps my computer as accurate as can be expected considering I'm using remote server sources and

Re: [time-nuts] What's the best Windows 10 ntp client?

From: Cube Central I would like to retract my previous statement. If you are only using the Windows system a couple hours a week, that may not be enough time for you to see any benefit from using NTP. NTP needs more time than that to "discuss" the local system time with the other

Re: [time-nuts] What's the best Windows 10 ntp client?

From: STR . https://www.meinbergglobal.com/english/sw/ntp.htm It uses NTP and you can set the servers you like in its (typically) C:\Program Files (x86)\NTP\etc \ntp.conf === As I mention here: http://www.satsignal.eu/ntp/setup.html it is suggested that the program

Re: [time-nuts] What's the best Windows 10 ntp client?

At my amateur radio club we have Internet access via a WiFi dongle with a Pay As You Go card. A Windows 10 PC is only powered up while we are there, so on around 2-4 hours per week. Does anyone have any thoughts on what might be the most suitable software to run on our Windows 10 PC to set

Re: [time-nuts] Sunrise, solar noon, sunset and the Equation of Time

I recently added code to Lady Heather to precisely calculate the sun position, sunrise/solar noon/sunset times and the Equation of Time... Egad, what a deep, dark rabbit hole that leads one down. And woe be unto thee that trusts any of the online calculators. Results can be over 10 minutes

Re: [time-nuts] Optical link connects atomic clocks over 1400 kmof fibre

From: Bruce Griffiths You'd need a rather thick copper jacket to shield effectively against the 50Hz magnetic field. Bruce == Would mu-metal be any use? https://en.wikipedia.org/wiki/Mu-metal http://mumetal.co.uk/ Cheers, David -- SatSignal Software - Quality

Re: [time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

From: STR . Not even ethernet with hardware PTP implementations, admittedly I haven't seen a NIC for sale with it? I've always wondered if something like https://store.uputronics.com/index.php?route=product/product=60_70_id=92 is worth the price over the likes of

Re: [time-nuts] DIY VNA design

[] To 500MHz, lower dynamic range to 1.3GHz: http://sdr-kits.net/VNWA3_Description.html OK, so the latter isn't build it yourself anymore. I have version 2.6 of the latter and it works really well to about 575MHz. Traces can get noisy after about 575MHz. Remember these VNAs are only as good as

Re: [time-nuts] Speaking clock

I would like to find an emulator of the old voice synthesizer used in the Atlanta airport subway. "The next stop is concourse A. The color coded maps in this vehicle match the station colors." "This vehicle is leaving the station, please hold on." They replaced it in 1996 for the Olympics but I

Re: [time-nuts] State of the art of crystal oscillator measurements

Ulrich - This may be a naive question, but, how can you achieve results that are so close to, and sometimes at further out are below kT? Thanks & 73 - Mike Mike B. Feher, EOZ Inc. === .. by reducing T? David -- SatSignal Software - Quality software

Re: [time-nuts] Safely getting the electrical length of a connected antenna feedline

From: Dr. David Kirkby (Kirkby Microwave Ltd) I thought i might be possible to do this with a VNA, and a test antenna located a known distance apart. So I asked in the Keysight forum on 8th Feb 2015 [] Dave ___ Folks, Yes, I've used the DG8SAQ Vector

Re: [time-nuts] Using the HP 58503a to correct your PC clock

The Meinberg page I'm reading has NTP downloads for Windows XP and newer and for older versions of Windows. If you meant a special version of NTP for Windows 7, I didn't see mention of it. Ron === No, it was just that you mentioned Win-7 and the Meinberg

Re: [time-nuts] GPS antenna selection

Dear fellow time-nuts! I'm currently investigating my options regarding GPS antennae (of course for time related purposes) and I'm really confused by the variety they come in ... (my apologies in advance for the long post). [] Many thanks in advance and my apologies again for the rather lengthy

Re: [time-nuts] Using the HP 58503a to correct your PC clock

Doesn't Meinberg have a Win7 version of ntp on their homepage ? Why not use that CFO === Installation guide and Win-7/8/10 notes here: http://www.satsignal.eu/ntp/setup.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web:

Re: [time-nuts] Sure GPS unit

It's available via eBay. SKG16A Bluetooth/RS232/USB UART GPS Module Demo Board http://www.ebay.com/itm/SKG16A-Bluetooth-RS232-USB-UART-GPS-Module-Demo-Board- /230844194302 Excellent! It went unavailable at one stage, so it's good to see it back. I'll have

Re: [time-nuts] Using the HP 58503a to correct your PC clock

This has probably been covered in the past, but is there a way correct or control a PC (Windows 7) clock with the HP 58503A GPS receiver? I just bought one (on the way now) and have a copy of satstats50 on hand. I've been using Dimension 4 and I'm surprised at the size of correction every

Re: [time-nuts] Adafruit Ultimate GPS timing message arrival times

From: Mark Sims Well, the whole point of the exercise is to see how well you can do if you DON'T have an internet connection, a 1PPS signal, or a stratum 1 time server available... only the humble messages coming from a 10 dollar GPS receiver. Try getting a net connection in the middle of

Re: [time-nuts] Adafruit Ultimate GPS timing message arrival times

From: Mark Sims As mentioned in the post the times reported are the time stamp in the receiver packet minus the system clock time when it was received... negative value indicate the message arrives after the PPS. The polarity of the reported value is consistent with how Lady Heather makes

Re: [time-nuts] Adafruit Ultimate GPS timing message arrival times

From: Mark Sims A couple of people have asked about the poor message arrival time performance of the popular Adafruit Ultimate GPS receiver. I modified Lady Heather to analyze the message arrival times using a histogram instead of a simple average. When I looked at the histogram data (.01

Re: [time-nuts] The home time-lab

But then you may find that you can NEVER finish a test. The AC line is typically full of transients. I've never thought UPS were a good idea for anything but a computer that needs to shut down gracefully. For your use you need something that cleans up the AC mains power. The best ones have a

[time-nuts] LeoNTP Networked Time Server now available

You might be interested in the LeoNTP Networked Time Server, which is now available: https://store.uputronics.com/index.php?route=product/product_id=92=ntp "LeoNTP is a Stratum 1 time server with GPS synchronised clock source designed from the ground up with the sole purpose of providing

Re: [time-nuts] 1 second timing error re leap second

Hello, Anyone know if the M12T or Lea Bloc GPS chips have the same problem as the Trimble products Regards Martyn = Do you mean ublox LEA6T? Ublox chips have generally been OK in the past, although I've not checked the LEA 6T. David -- SatSignal

Re: [time-nuts] GPS message jitter (was GPS for Nixie Clock)

From: Scott Stobbe I am happy to hear you issue was resolved. What I meant to say is the problem could also be mitigated using the UART's flow control, this could be done by the original GPS designers or by an end user if the CTS line is pined out. Gating the UART with a conservative delay, say

Re: [time-nuts] GPS message jitter (was GPS for Nixie Clock)

I suppose it is one of those cases where, the GPS designers decided you shouldn't ever use the serial data for sub-second timing, and consequently spent no effort on serial latency and jitter. Most UARTs I have come across have been synthesized with a 16x baud clock and included flow control. It

Re: [time-nuts] GPS message jitter (was GPS for Nixie Clock)

You can also use the QueryPeformanceCounter and related functions for better precision. From: Mark Sims Heather's gotta work with XP (and maybe Win98)... too many people (including me) run it on old trashy laptops, so no fancy pants new fangled Windoze calls allowed... In the past I've

Re: [time-nuts] GPS Antenna

Hi On Jul 17, 2016, at 2:35 AM, David J Taylor <david-tay...@blueyonder.co.uk> wrote: Why is the noise figure so high on these antennas (2.5 dB)? Is that some pre-filtering, perhaps? They are designed as timing antennas. That normally puts them in a “lots of RF” environment. (like

Re: [time-nuts] GPS message jitter (was GPS for Nixie Clock)

From: Mark Sims I just added some code to Lady Heather to record and plot the time that the timing message arrived from the receiver (well, actually the time that the screen update routine was called, maybe a few microseconds difference). I am using my existing GetMsec() routine which on

Re: [time-nuts] GPS Antenna

The GPS Antenna Micropulse Z1001 appears to be what is now designated GPS-TMG-26N Lester B Veenstra MØYCM K1YCM W8YCM les...@veenstras.com __ Why is the noise figure so high on these antennas (2.5 dB)? Is that some pre-filtering, perhaps? David --

Re: [time-nuts] GPS for Nixie Clock

I, for one, will be following your progress... I think it would be cool as heck having an ultra-accurate clock with a Nixie display... It'd be cool to make it flexible enough to output the time sync to other equipment... __ Clay Autery, KY5G

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