Re: [time-nuts] future NTP programs...

From: Poul-Henning Kamp [] My first target is a daemon for clients, that's the most efficient way to eliminate as many KLOC-executions from the world as possible as fast as possible. After that, the intent is to reuse the same components also for S2+ slave servers, and later again S1 servers. Bu

Re: [time-nuts] future NTP programs...

- that there is (eventually) a Windows implementation. I'm writing the code to be as portable as I can make it, but I have neither Windows machines nor clue how to program for their kernel-time-api. - that it responds to "ntpq -pn" and "ntpq -crv" commands so that it can be easily remotely mon

Re: [time-nuts] future NTP programs...

From: Poul-Henning Kamp [] Personally, I feel that the ability to monitor the workings of an NTP implementation remotely is an important feature of the (present) software. So, this is one thing I really don't understand... You can monitor all your clients from your server if you want to, by lo

Re: [time-nuts] LTE-Lite

With the LTE-Lite, are the survey results held in non-volatile memory, or does it need to do a survey each time it is switched on? This is a fixed location. The survey light is still on after a number of hours of operation (but it may have gone off in the meanwhile), and the GPS light sometim

Re: [time-nuts] LTE-Lite

David it always does a survey. Though even while doing that the frequency output is fine after its had a bit to stabilize. I wanted to bring the survey lamp out to a front panel LED however that appeared to be more work and risk then the value. The documentation says that from time to time it will

Re: [time-nuts] LTE-Lite

Have you considered to use a light pipe? Hopefully you could get enough light out. Or is all else fails, use a photodiode to detect the light and drive an LED. Dave. Good suggestion, Dave. Light pipes used to be very popular, but I couldn't find one when I

Re: [time-nuts] FYI: Galileo satellite recovered and transmitting navigation signals

From: Hal Murray I've seen lots of comments about units that will use other than GPS satellites, but I don't think I've seen any actual output from one of them. Is that just a gap in my toy collection or has reality not caught up with the marketing hype? (Or perhaps I just haven't looked in th

Re: [time-nuts] Beaglebone NTP server

From: Chris Albertson Really? The PPS to GPIO interface is handles in user space? It is not interrupt driven? In the implementations I've seen the critical real time work is done inside the PPS interrupt handler and then of course ntpd runs in userland and can take as much time as it needs ===

[time-nuts] 10MHz LTE-Lite - PPS accuracy?

On the 10MHz LTE-Lite, how far out from true UTC would the PPS be expected to be? It seems to be about 200+ ns late on my unit, although it is much more stable than a typical GPS/PPS produces. Thanks, David -- SatSignal Software - Quality software written to your requirements Web: http://www.

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

Hi On *most* GPSDO’s, the simple answer is “there is a cable delay adjustment to align it”. Without some sort of reliable representation of UTC (at the ns level) it’s tough to measure. If you happen to live at USNO or NIST, you can access that sort of timing. For the rest of us - not so easy.

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

From: Bill Dailey Or use 1ns per foot of antenna cable. That will get you closer. == I was using 5ns per metre to allow for velocity factor. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email:

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

From: Dave Martindale What is the source of the 1 PPS you are comparing against? I compared my LTE-Lite to an old Thunderbolt (original model, single 24 V input with internal DC to DC converters, Piezo oscillator). At the time, the Thunderbolt had been running for a few months, while the LTE-Li

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

I work with Said at Jackson Labs. I've been reading the time-nuts discussion for a few years, but rarely chime in. I saw this discussion and wanted to make a couple points. * The LTE Lite time accuracy specification corresponds with the Skytraq GPS receiver's specs page which I have attached.

Re: [time-nuts] Beaglebone NTP server

Thanks for pointing this out David, Compiling an new kernel was holding me back. I followed your instructions and everything works beautiful. The PI that is running the PPS timekeeping with NTP is serving as a VLF receiver as well. Taxing the poor CPU, but with kernel PPS support the NTP daemon

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

From: Dave Martindale In my case, the LTE-Lite had been operating for at least a week before I made my "accumulate mode" measurement, and the Thunderbolt had been operating for at least a month. But both antennas were in poor locations - not bad enough to lose lock any time I was watching, but n

Re: [time-nuts] Beaglebone NTP server

Hi David, Yes, You mean the hourly dips? That is caused by the the VLF receive software that is running on the same PI. It makes hourly recordings of DC to 24 Khz with a USB soundcard. The CPU is running at max capacity most of the time. Perhaps it is now time for a dedicated PI, that only has th

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

Gents- I don’t know if everyone is aware, but the USB PPS out is basically useless on both my units - at least 200us off if not more. Make sure you’re using the PPS OUT and not trying to measure on the DCD of the USB int, as is easy to be drawn to do. NS

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

I'll admit, to my shame, that I have yet to deduce how to use USB provided DCD for PPS. I've looked, really I have but to no avail. I see that the code has been in the driver circa Linux 2.6 but I'm just not making the "connection". Can't comment on Linu

Re: [time-nuts] Beaglebone NTP server

[] So, I am still looking for a straight-forward, "here is a really good way to use a BBB coupled to a GPS 1pps to do NTP," treatise. Better still if someone is using their LTE-lite to do it. It seems like a nice little package for the amateur time-nut for everyday time and frequency keeping. [] B

Re: [time-nuts] Which First GPSDO to buy?

All, As a relative newcomer to this list, I have been reading the posts concerning GPSDOs. I have what I hope is a simple question. For a newcomer to this field, which GPSDO would be better to purchase as a first-time acquisition: - This "LUCENT/SYMMETRICOM Z3810AS, KS24361 L101/L102, HP-KIO OE

Re: [time-nuts] Set time on Solaris computer from HP 58503A

Of *course* you can sync to better than a millisecond on the LAN. There's not a machine worldwide at my employer more than 600 micros off from each other, and the machines at my house are within 50. You wanna start talking the sync-e+1588 test I'm doing? We're speaking in nanos then. My LTE Li

[time-nuts] The future of atomic clock - short video from the NPL (UK)

This short video may be of interest: https://www.youtube.com/watch?feature=player_detailpage&v=r8Y53QOm_3s "E&T reporter Tereza Pultarova has visited the ‘guardians of time’ at the National Physical Laboratory to learn how to make future atomic clocks more precise and fit them into hand held

[time-nuts] Soekris without a GPS receiver.

I have a Soekris 4501 running with NanoBSD and have got as far as adding the PPS/DCD/GPIO modifications to the hardware. NTPns itself is working, and the red LED is flashing as expected. I would now like to get NTPns working with that more precise timing which is available, but as I don't hav

Re: [time-nuts] Soekris without a GPS receiver.

Look at the bottom of this page refclock.htm for a list a clocks that NTP can use. Some of them are GPS receivers. For example "type 30" is the Oncore line of receivers and Type 20 is any generic NMEA GPS receiver, with is by far the most common type. The

Re: [time-nuts] Soekris without a GPS receiver.

From: Paul Did you replace the crystal? I would now like to get NTPns working with that more precise timing which is available, but as I don't have an Oncore or a DCF77 receiver I am stuck. I suspect you'd need to ask PHK. NTPns supports pps-api and it supposrts ntpv4 as a time source so

Re: [time-nuts] Soekris without a GPS receiver.

From: Paul [] I've avoided asking why you're doing this because -- to misquote Yoda -- "Do nor do not, there is only try" But if you're not switching out the system clock it doesn't really seem like either a time-nut or ntp-nut project. ___ Thanks for

Re: [time-nuts] Soekris without a GPS receiver.

From: Chris Albertson Can't you combine a few Internet pool NTP servers with a local 1PPS source? The Internet servers will "name the seconds". Also if you really need a Motorola Oncore you can buy them for $20 on eBay. There is no shortage. I paid $18 with free shipping for a UT+ I run the

Re: [time-nuts] New Years Eve TV countdown

The local ABC network affiliate WJLA in Washington DC was approximately 4 seconds behind WWV in their on-screen countdown clock for New Year's eve. The local NBC affiliate's clock was about 8 seconds late when I checked them at two minutes before midnight. Happy New Year! Dan Schultz N8FGV

Re: [time-nuts] Soekris without a GPS receiver.

Why not run the "normal" ntpd? Seems it would do what you want. I don't see how a PPS source can NOT be supported. I'm talking about just the 1Hz square wave signal, no serial data. Just like ntpd's type 22 clock. See this http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver22.html It

Re: [time-nuts] Soekris without a GPS receiver.

From: Chris Albertson I think if you re-install any normal OS out of the box it will have the standard NTP included. Just get Ubuntu Linux then it will have ntpd already setup. Without PPS there is little point in having a GPS. These questions are best asked in the NTP mailing list. http://lis

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

Hi Tom dividing down wasn't always necessary I have sample from the UK GPO Crystal Factory of NT-cut bars, quartz tuning fork, and Gapped Ring crystals, the latter marked 400cps (pre Hertz :-)) ) I think these are post WWII because they are mounted in IO base GT style tube envelopes. Dividers w

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

Hi David yes I think I have seen similar but not as low as that. If you compare the suspension points the different vibrational mode should obvious.the suspension point is at a node. I think some of these are quite difficult to excite, I have not seen any suggested circuits but I have not look

Re: [time-nuts] Sources for Mission Time Clock

Martin, [] 4) The television monitor ideas are an easy solution. Use a PC or Raspberry Pi. One example here: https://www.youtube.com/watch?v=vBQ3uqMep58 /tvb = .. and a Raspberry Pi clock with source code you could easily modify: http://www.satsignal.eu/ras

Re: [time-nuts] In search of ways to improve Raspberry Pi stratum 1server

Hi all, This is my first post to the list. I have a Raspberry Pi B+ and a HAB Supplies U-Blox Max-M8Q set in stationary mode connected to a Virgin Media Superhub (broadband router) by a 0.5m cat7 ethernet cable. The GPS is attached to the Pi's GPIO and has an external active antenna placed on

[time-nuts] Some history about the Greenwich time signal....

Some history about the Greenwich time signal "At one time, some of the most accurate clocks in the world snuggled in the folds of Surrey beauty spot Leith Hill. Why, because some of the most accurate compasses in the world were already there. Just before World War Two, a duplicate of the

Re: [time-nuts] GPS leap second pending (TBolt/Heather)

my monitor ( see http://www.romahn.info/tbolt2lcd/ ) also shows "leap sec pending". This info is from Thunderbolt. Götz = I see no spurious indications from the NTP servers I happen to be using. I wrote a program to check: http://www.satsignal.eu/software/net.

Re: [time-nuts] TimeLab with Wine: No RS232 interface available

I have seen several issues with Windows programs not releasing (or perhaps not being able to releaase) the serial ports after using them. Once one of these programs accesses the serial port, no other programs can use it until you re-boot. I'm fighting windoze Hypertrm right now over this iss

[time-nuts] MSF Scheduled Maintenance Periods

MSF Scheduled Maintenance Periods The MSF 60 kHz standard-frequency and time signal, broadcast by Babcock on behalf of NPL, is occasionally taken off-air to allow maintenance work on the masts and antennas at Anthorn Radio Station to be carried out in safety. This means that your radio-control

Re: [time-nuts] MSF Scheduled Maintenance Periods

Could it be that they changed something with their setup? A couple of years back I could receive MSF fine (Gouda, the Netherlands) but this year (reconnected the radio in January) no bit comes in at all. The led on the radio also flickers dramatically, not once per second. Folkert van Heusden ==

Re: [time-nuts] hackers] MSF Scheduled Maintenance Periods

From: Roger Broughton MSF transmission moved from RUGBY to somewhere in the lake district a couple of hundred miles further away from the Netherlands. === Yes, but that was in 2007, hardly "a couple of years ago". The new location is at Anthorn (54.91°N 3.28°W).

Re: [time-nuts] Looking for advice to get a submillisecond setup

Hi, My university would like to have a <1ms precise source of time to do some networking experiments (measure one way propagation delays etc...). So I wandered on the internet to find the best choice with a budget of ~1000€ (~1100 American dollars). I've been overwhelmed by the number of possibil

[time-nuts] UK 60 kHz MSF outage

I have received the following: UK 60 kHz MSF outage: Mon 2 - Thurs 19 March, 08:00-18:00 UTC - service off-air each day (will be back on air overnight & at weekends). Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-t

[time-nuts] Comparing the BeagleBone Black & Raspberry Pi as NTP servers

Folks, I've just put up my first draft of a comparison of these two popular devices as NTP servers: http://www.satsignal.eu/ntp/BBB-vs-RPi.html Comments welcomed - I know it's an imperfect test! Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

David: On the BBB, were you running the fully loaded release, or the minimum "console" version of the OS? Which specific version of the OS? Thanks, --- Graham = Graham, The download was: bone-debian-7.8-lxde-4gb-armhf-2015-03-01-4gb.img.xz (547,024,548 bytes)

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

David: On this page: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBW.2FBBB_.28All_Revs.29 they list an alternative console only image: https://rcn-ee.com/rootfs/bb.org/release/2015-03-01/console/bone-debian-7.8-console-armhf-2015-03-01-2gb.img.xz It might be easier starting with that

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi as NTP servers

From: Attila Kinali Something is wrong here. I would expect the BBB to perform at least as well as the rpi (after all, the BBB has an ethernet MAC with IEEE1588 support, while the rpi is basically a glorified USB controller with attached graphics card). You are most likely running services on th

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

David: On this page: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBW.2FBBB_.28All_Revs.29 they list an alternative console only image: https://rcn-ee.com/rootfs/bb.org/release/2015-03-01/console/bone-debian-7.8-console-armhf-2015-03-01-2gb.img.xz It might be easier starting with that

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

Folks, Many thanks for all your comments. I am now undertaking tests with the stripped-down "Console" build of the OS. With both the RPi and the BBB I started with what the typical user might install rather than any special version (indeed, it's built into the BBB). It seems that while many

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

From: Neil Schroeder The other key key key item is make sure you hand build yourself a 3.14 or .16 kernel. NS = Thanks, Neil. I'm afraid I have neither the expertise nor the patience to do that, and to an extent this was intended to be an out-of-the-box compar

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

From: Hal Murray http://www.satsignal.eu/ntp/RaspberryPi-notes.html#EthernetLatency Thanks for the tip. I did that to my R Pi and I see the same improvement in round trip time. What I don't understand is why the time offset as measured by an outside system didn't change. ?? ==

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi asNTP servers

From: Hal Murray david-tay...@blueyonder.co.uk said: Perhaps because NTP sees the offset in both send and receive packets and therefore, like any other network delay, it is subtracted out. The description of the change was to remove a delay on the receive side. There was no mention of a change

Re: [time-nuts] Comparing the BeagleBone Black & Raspberry Pi as NTPservers

Many thanks for all the comments and help with this comparison - I have now updated the page, and the results are more in keeping with what would be expected. The BBB is better if time serving is its only function, although keep it well away from any GPS antennas! http://www.satsignal.eu/ntp

Re: [time-nuts] Striking change in iPhone time accuracy with 8.2

Has anyone else noticed a dramatic improvement in the accuracy of time of day on iPhones and iPads since the release of iOS 8.2? The accuracy used to be only plus or minus 2 or 3 seconds, now it is about 100 times better, usually a few tens of milliseconds. I figure Apple might have finally paid s

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

I think beagle bone black is the answer to this question (because rPi has a USB<->network interface that´s problematic) but i´ll let others that know more than me about this specific subject follow on Daniel == "Problematic" if you are after microsecon

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

From: Didier Juges Is the new RPi2 any different in that regard? The RPi 2 has the same basic configuration (Ethernet over USB), but has a 4-core CPU and 1 GB memory, making it very usable as a stand-alone PC. NTP compiles within a "reasonable" time - about the same a

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

"Problematic" if you are after microsecond-level accuracy, perhaps, but so would the BeagleBone be. If your needs are more in the 100 microsecond range, either would be fine with a reasonably wide PPS pulse. Not really. If you know how to write C, you can use the timer on the BBB and get to sub

Re: [time-nuts] Visual clock comparison

From: Chris Albertson It would be an easy experiment to get two analog clocks and put them side by side. You would not even have to set them to the "true" time, just to each other. Let one run slower and wait until you can see a difference. Clocks on a computer screen are different because the

Re: [time-nuts] Visual clock comparison

From: Chris Albertson I think the question really was "How close must two visual clock displays be to be perceived as being exactly in sync?". Some people (but not me) can see a 1/10 second difference and to me a one second difference is obvious. The answer is likely between 1.0 and 0.1 seconds

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

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 abl

Re: [time-nuts] USB problems and solutions - Some what Off Topic

[] The RPi doesn't seem to have a good reliability record, so that doesn't seem like the solution. Thanks time-nuts, what a resource. Cash Olsen ___ Very few problems with multiple RPi cards here. Most of the problem reports I've seen have been fro

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

Hi all, On Friday I toured the METAS Time & Frequency lab with two others: Patrick, a colleague from work and Atilla, a fellow time-nut. I'd like to report a bit about what we learned today that may be of interest to other time-nuts. [] If anyone has any questions or comments, let me know and I'

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

From: Ed Armstrong [] OK, here is the actual question. Do you think it is OK to consider a pulse which arise 250 ns early to be close enough? And no, I am not forgetting about that 3 ns, there is about 3 ns of delay added by the output circuitry. Hope you didn't mind the long-winded post, and I t

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is "Good Enough"?

Hi Max! Thanks for the information, I was wondering if you had documented what you did to your Raspberry Pi so that it might be reproducible to someone like me (a newcomer time-nut and intermediate Linux user) ... you had said: [] Thanks so much for your assistance! Sorry if these questions h

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is "Good Enough"?

Hi At best, simply because of the way that USB interface works, you can go from the ~1/2 ms range into the ~1/4 ms range. Rewriting the low level drivers may be required. This compares to an equivalent lag on a device with a built in ethernet of < 0.001 ms. The easy thing to do is to simply k

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is "Good Enough"?

Hi Just to be clear, your peer delay numbers for the Pi show and improvement from 0.5 ms down to 0.3 ms with some tweaks. A “non-usb” ethernet setup can get those delays down much further. In the context of the original question “tweaking the USB drivers” this is what was being addressed. Bo

Re: [time-nuts] potential source for cheap copy of labview

From: Jim Lux [] Mathworks still does a variety of low cost licenses, including a $149 for Matlab "home" license + $45 for add on products. (not for academic, commercial, govt, or organizational use) They also have a $49/$99 student license "in conjunction with coursework at a degree granting ins

Re: [time-nuts] windows and leap seconds

From: Jim Lux https://support.microsoft.com/en-us/kb/909614 basically: ignore the leap second, so your computer is "fast" relative to UTC, and next time you resynchronize time it adjusts Windows, these days, runs NTP http://blogs.msdn.com/b/mthree/archive/2015/01/08/leap-seconds-010815.aspx ht

Re: [time-nuts] Greetings from Australia

Hi Guys :) I thought I’d say thanks for the add to the group and introduce myself. [] I have a question… Is the reason most amateur radio people care about accurate frequency mostly about operating at higher radio frequencies? I imagine if a bunch of radio enthusiasts aligned their HF radios wit

Re: [time-nuts] Number of GPS sats in the sky?

Is there a practical limit to the number of GPS sats overhead at any one time? I ask this because I'd like to start parsing this info from my ublox receiver and need to setup an array for the values. Memory is not unlimited on my PIC. Bob - AE6RV == Others have gi

Re: [time-nuts] GPS outage? 19:00-2100 UTC Tue

From: Hal Murray Most/all of my GPS toys stopped working for a few hours late Tue evening. A few where I have good logging ran out of satellites. Did anybody else notice anything similar? Was it local interference, or something at the GPS level? I'm in Menlo Park California. That was mid aft

Re: [time-nuts] monitoring NTP servers?

Hi all, Is there a ready made set of scripts for monitoring a bunch of NTP servers? Preferably for generic unix/linux like ubuntu. I imagine it would look something like: 1. measure data with a test machine, either use output of "ntpq -p" or perhaps python and ntplib. Variable measurement interva

Re: [time-nuts] A new time nut - and a question!

Hi list, I recently got time to build my first stratum-1 GPS timeserver around a raspberry-pi (first model) and one of these [1]. I would ideally like to have it work as a completely standalone time source, only getting timing information from the GPS signal it is receiving (no network peers). As

Re: [time-nuts] "Selective availability" af accurate time for Appleusers?

Has anybody else observed this with their iPhone since “upgrading” to iOS 9? Anyone know of any difference in the reference time ( e.g. GPS vs. network time) that Apple is using to “dumb down’ their smartphones in favor of Apple Watch? Brian Garrett Yes, o

Re: [time-nuts] RG 6 U couplings

Bert, Extending the RG-6U using N-connectors should not be giving you more than 0.20 dB, probably less. Considering that you have have 6.12 dB per 100 feet in RG-6U at 1 GHz (should be about 8 dB @ 1.575 GHz), so it will be more. Using N-connectors to extend the cable-stretch isn't going to be a

Re: [time-nuts] RG 6 U couplings

David, You obviously is not working with 75 Ohm N-connectors on a regular basis. Also, the point was to show that using proper connectors isn't going to be a major issue in the loss process. Cheers, Magnus Magnus, No, I've never seen a 75-ohm N connector, nor an N connect

Re: [time-nuts] beaglebone black, debian, NTP client

Has anyone fooled with using NTP on a beaglebone black running Debian (the beagleboard.org image)? I assume it's just a matter of turning on ntpd (which I'm not sure is even installed) and/or running ntpdate (I'm not looking for super accuracy.. it's for a sprinkler timer) ==

Re: [time-nuts] beaglebone black, debian, NTP client

A couple of people have. If you look at the archives you'll find a few of those. Dan Drown sticks out a bit here, as he is AFAIK the only one who used a GPIO as a PPS input on the BBB: (last mail seen around december 2014) http://blog.dan.drown.org/beaglebone-black-timer-capture-driver/ http://bl

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

I'm receiving pulses on 100 kHz with AirSpy and a SpyVerter, but I have no Windows software to decode the signal and determine just which LORAN it is. Can anyone recommend suitable Windows software? Being located in Edinburgh the signal is reasonable strong. Thanks, David -- SatSignal Software

Re: [time-nuts] beaglebone black, debian, NTP client

On Sat, 2 Jan 2016 11:47:09 - "David J Taylor" wrote: I'm also using PPS with the BBB - you even commented on my Web page! http://www.satsignal.eu/ntp/BBB-vs-RPi.html Yes, I know. But I didn't mention your webpage, because there is something weird going on with you

Re: [time-nuts] beaglebone black, debian, NTP client

That's one thing that annoys me with those graphs. If you average jitter it loses its meaning. What you then get is the mean deviation (aka offset). Without an accompanying standard deviation (and a test that you actually have a gausian distribution) this value is not worth much. What I am talkin

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

FOlks, Whilst it's not e-LORAN, and it may not be of much help, I can at least now look for signals here in Edinburgh give the GRI. I'm using: - e-field vertical mounted in the loft (yes, it would be far better outside) - SpyVerter/Airspy receiver hardware - SDR# receiver software - Virtual A

Re: [time-nuts] GPS jumps of -13.7 us?

Appears to have caused a disruption to the UK digital radio distribution network: http://www.bbc.co.uk/news/technology-35463347 Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk Twitter: @gm8arv

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

I currently operate a stratum 1 NTP server in the NTP pool using a U-Blox Max-7Q GPS module with PPS attached to, variously, a Raspberry Pi via GPIO or a Celeron mini PC via serial DB-9. The machine does nothing but serve time to the pool. Operating systems of choice are Debian or FreeBSD. Wha

Re: [time-nuts] How to run Lady Heather under Windows10

There are multiple possible issues: 1) Most (like 99.99%) new laptops do not have a com port, that gets you to some sort of external port 2) USB is pretty common, but as mentioned in another thread, ethernet and bluetooth are also quite possible. 3) Since it is an external bus, the connection

Re: [time-nuts] How to run Lady Heather under Windows10

NEville Thoughts 1)Get rid of WIN10 ...and instal WIN7 on the new laptop 2) Are you running a USB to COM port adapter? Could be a WIN 10 driver problem 3) as far as I know Windows in any version wont allow SLASH in a file name. I am not familiar with Lady Heather so I do not understand the use

Re: [time-nuts] Spectrum Analyzer Specifications

For non-time-nuts quality, there is fast spectrum analyser software now available for the Airspy receiver. Although based on an RTL tuner, this receiver has a 12-bit ADC, so better dynamic range than the typical dongle. http://airspy.com/download/ http://airspy.com/specifications/ I have no

Re: [time-nuts] Raspberry PI 3 NTP server with GPS time data.

-Original Message- From: jan hugo prins Sent: Sunday, April 24, 2016 7:51 PM To: time-nuts@febo.com Subject: [time-nuts] Raspberry PI 3 NTP server with GPS time data. Hi, To get a more stable NTP source into our production network I have started exprerimenting with a Raspberry PI 3 with

Re: [time-nuts] MSF 60KHz Problems?

Is anyone else seeing anthing unusual with the MSF 60KHz signal from Anthorn? For the past 24 hours or so, at least, all I've been monitoring here, approx 100 miles from Anthorn, is what seems to be a much weaker than usual carrier that's pulsing at significantly faster than once per second. It's

[time-nuts] UK: GPS Jamming Notices

I have received the three following notices: NOTIFICATION OF GPS JAMMING EXERCISES STANFORD TRAINING AREA, EAST ANGLIA, FEBRUARY 2013 Dates: Between 11 and 15 February 2013. Times: 0900 -1600 GMT. Location of MULTIPLE jammers: Land based within

Re: [time-nuts] PPS offset between GPS receivers

Hi Based on a quick look, the SkyNav does not appear to be a timing specific part. A 2 us error in a navigation part would come as a big surprise. Bob == Indeed! The PPS output of various navigation parts I've checked recently have typically been

[time-nuts] ANN: UK MSF 60 KHz shut-down on 13 December 2012 from 10:00 to 14:00 UTC

Folk, I have received the following announcement: + Notice of Interruption MSF 60 kHz Time and Frequency Signal The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio Station will be shut down on Thursday 13 December 2012 f

Re: [time-nuts] PTTI 2012, part 3/3

They did respond back and I am limited to 1. Wanted 2 but such is life. :-) Will order most likely Monday. Regards Paul WB8TSL You were lucky, Paul. I have so far received no response to my query. 73, David GM8ARV -- SatSignal Software - Quality software wri

Re: [time-nuts] PPS offset between GPS receivers

I'm now using the SKG25A1 as a PPS source for an NTP server. Aside from the offset, I noticed a large offset jump in the NTP loopstats (attached) occurring about once a day. This is not the server oscillator drifting since the frequency graph looks good at this point and this behavior can sometime

Re: [time-nuts] PPS offset between GPS receivers

From: Gabs Ricalde [] David, I forgot to thank you for your helpful site and NTP plotter. I have the antenna outside with a 180 degree view of the sky, outages should be rare. Looking at the loopstats, the outage during the 4 us jump is about 12 seconds. This is a test server, I only have the LO

Re: [time-nuts] PPS offset between GPS receivers

I'm not sure about the jammer but I'm running a timing receiver in position hold several floors up, I haven't seen dropouts like this. ntpd is running with a "noselect" NMEA source since I'm having problems with ntpd marking the PPS and NMEA as falsetickers. The startup sequence for the server is

Re: [time-nuts] Synergy SSR-6TR

From: Don Latham Sent: Thursday, December 13, 2012 9:26 PM To: time nuts Subject: [time-nuts] Synergy SSR-6TR The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off basis. Shipping is about $10. The very best way to order is from: Gina Aspeytia [] However, the cheapest shipping

[time-nuts] ANN: UK Ofcom Update: GPS Jamming Notice, 18 and 22 March 2013

Folks, I have received the following: _ NOTIFICATION OF GPS JAMMING EXERCISE STANFORD TRAINING AREA, EAST ANGLIA, March 2013 Dates: Between 18 and 22 March 2013. Times: 0900 -1700 GMT. Location of MULTIPLE jammers: Land based within 5km of N52° 29.0' E000° 45

Re: [time-nuts] Synergy SSR-6TR

David Unfortunately as easy as that is to do that would remove me from the buy 1 list. Sorry. You need a timenut that doesn't want one. :-) Paul WB8TSL == Yes, I appreciate that, Paul. Why I said "almost considered". But if there is someone willing, I would be

Re: [time-nuts] Synergy SSR-6TR

David, Any chance you can buy it in your name and have it shipped somewhere in the States? That person then can forward it without losing their chance to get one as well. I have no experience shipping overseas but will second Bert's suggestion plus volunteer myself to do it, if need be. How can

Re: [time-nuts] RaspberryPi and RADclock

From: paul swed Thanks. I really like the idea that a Rassberry Pi could be a time server. Maybe enough to get me going. Thanks === Paul, I wrote up my experiences with the Raspberry Pi as a standard NTP server here: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.h

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