[time-nuts] Maintenance day for MSF 60 KHz service in UK

2018-06-06 Thread Peter Vince
The UK's National Physical Laboratory have just confirmed that the MSF 60 kHz time and frequency signal broadcast from Anthorn Radio Station will be shut down on Thursday 14 June from 10:00 to 14:00 BST (09:00 to 13:00 UTC) for routine maintenance. The maintenance schedule can be seen at:

Re: [time-nuts] NEO-M8N vs. NEO-M8T

2018-05-21 Thread Peter Vince
On 21 May 2018 at 21:24, Mark Sims wrote: > > One thing to look out for when messing with sawtooth messages is the question of does the message come > out before or after the PPS pulse... good look finding the answer in the receiver documentation... > > "After" seems to be the most common answer.

Re: [time-nuts] ✘NEO-M8N vs. NEO-M8T

2018-05-21 Thread Peter Vince
Hi Gary, It sounds like you need some special hardware that corrects the pulse timing before feeding it out. Richard Hambley's CNS-II did exactly that, using a programmable delay-line - see: https://www.cnssys.com/cnssys.php I seem to remember discussion about that in the Time-Nuts

Re: [time-nuts] Low noise Oscillator

2018-04-25 Thread Peter Vince
Thanks Bert. They seem to have published it online too - see: http://www.microwavejournal.com/articles/30053-ultra-low-phase-noise-oscillators-with-attosecond-jitter Regards, Peter Vince On 25 April 2018 at 14:30, ew via time-nuts <time-nuts@febo.com> wrote: > In the April

Re: [time-nuts] Environmental sensor recommendations

2018-04-05 Thread Peter Vince
Hi Mark, SparkFun have some boards that have multiple sensors. They *used* to do one with a USB connection that had temperature, pressure, humidity, and light! But I see that is now "retired" ( https://www.sparkfun.com/products/retired/8311 ) and has been replaced by an Arduino shield:

Re: [time-nuts] ULN regulator with more current capability than LT3042?

2018-03-19 Thread Peter Vince
Please forgive this naive question, but I am concerned about the idea of simply running two regulators in parallel. Just like you don't put two batteries in parallel, how do you ensure accurate load balancing between the two? I would worry that one of them, with a fractionally higher voltage,

[time-nuts] Downconverter for Quartzlock A8 GPS Freq and Time Standard

2018-01-04 Thread Peter Vince
A friend here in the UK has asked me to ask if anyone has a Downconverter for the Quartzlock A8 GPS Freq and Time Standard. Please contact me off list, and I'll pass on any replies. Thank you, Peter ___ time-nuts mailing list --

Re: [time-nuts] UltrAtomic clock.

2017-11-05 Thread Peter Vince
Hi Dan, I can't answer directly as I am in England, but I have a similar problem with my MSF and DCF clocks here in the autumn (sorry, "Fall" :-) - my clocks only switch on their receivers once a day, at 1 o'clock in the morning, but at the end of summer our time doesn't change until 2

[time-nuts] Fwd: Annual Maintenance Shutdown of the MSF Service 14 - 31 August 2017

2017-07-24 Thread Peter Vince
The 60KHz time signal service "MSF" in the UK is to be closed down during the day for the latter part of August for routine maintenance: Annual Maintenance Shutdown of the MSF Service The annual maintenance shutdown of the MSF service to

Re: [time-nuts] A milestone approaches

2017-07-14 Thread Peter Vince
Good morning all - I hope you enjoyed the Unix 1.5 billion parties? An ex-colleague who used to work on VAX computers has just sent me this related message: OpenVMS also has something to say about time: . OpenVMS represents system time as the 64-bit number of 100ns intervals since midnight

Re: [time-nuts] A milestone approaches

2017-07-13 Thread Peter Vince
2038 could be an "interesting" year - on the 22nd of April, the MJD hits 65535 (2^16-1) ! On 12 July 2017 at 13:19, Tom Van Baak wrote: > Thanks for the notice. Add these to your list: > > 2147483648 0x8000 Tue Jan 19 03:14:08 2038 GMT (you survived) > > While

[time-nuts] Software for Spirent GSS4100 GPS simulator

2017-06-25 Thread Peter Vince
and vice-versa, and if that CD has been lost by the original hardware owner, it seems reasonable for the new owner to ask for a copy of said software, and so my conscience is clear in asking for a copy. Thanks in advance, Peter Vince ___ time-nuts mail

Re: [time-nuts] GPS Antenna on Tower.

2017-06-20 Thread Peter Vince
Hi Mark, This is all new information to me - and fascinating! Have you just "calculated" the offsets (using known values from somewhere), or "measured" it by very long term averaging of the GPS position information? Peter Vince On 20 June 2017 at 17:34, Mark Sims

Re: [time-nuts] uC ADC resolution (was: Poor man's oven)

2017-06-07 Thread Peter Vince
On 7 June 2017 at 21:40, Attila Kinali wrote: > > Additionally: if I would set out to build my own OCXO today, I would > go and buy one of those lunch thermos flasks to house everything. Their > isolation is higher than anything you can easily build yourself, > especially at

Re: [time-nuts] Anthorn eLoran

2017-05-10 Thread Peter Vince
Hi Alan, I get the impression there is a new project under development to make it a commercial operation - see: http://www.taviga.com/ Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Anthorn eLoran

2017-05-10 Thread Peter Vince
I gather there is an intermittent fault that is taking out a fuse, which they are, necessarily, working hard to rectify. Peter On 10 May 2017 at 10:58, Iain Young wrote: > On 09/05/17 20:28, moGandalfG8--- via time-nuts wrote: > >> Iain Young wrote: >> I now have all four with

[time-nuts] MSF maintenance day

2017-03-10 Thread Peter Vince
ew seconds later it bounced back at reduced power for a few seconds. When it was turned on again half an hour later, they slowly ramped up the power over about a minute! (Plots from screen-grabs of Audacity from the recorded CW tone.) Peter Vince (Londo

Re: [time-nuts] Timelab question

2017-02-21 Thread Peter Vince
On 21 February 2017 at 23:35, Mark Sims wrote: > ... > I plan to package up my TICC and a couple of TADD-2 Mini dividers with a > RPI-3 and the 7" touchscreen display and an Osciiloquartz 8663 DOXCO to > make a small ADEV analyzer box. > Wow! If you can persuade John and

Re: [time-nuts] Vintage Frequency Measurement

2017-02-14 Thread Peter Vince
On 14 February 2017 at 04:23, Raj wrote: > I have a Marconi T.F. 643 C, in Megacycles ! > Ah, a sensible, descriptive name for the unit. Some of these modern units really do Hert(z) :-) Peter ___ time-nuts mailing list --

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

2017-02-13 Thread Peter Vince
Surely you just loop it through two counters using a T-piece, with those counters set to high impedance input, then only terminate the final one? Peter On 12 February 2017 at 18:16, gkk gb wrote: > That is an interesting suggestion (thanks), and would indeed work

Re: [time-nuts] Manual for Ashtech Ranger Z-12?

2017-02-08 Thread Peter Vince
Hi Brooke, There is a 16.5 Mbyte manual for the desktop model on: http://ashgps.com/mirror/master/Z12-Type%20Receivers/Manuals/z12.pdf ...don't know how different the portable "Ranger" model is. Peter On 8 February 2017 at 19:00, Brooke Clarke wrote: > Hi: >

Re: [time-nuts] Leap second - MSF time signal

2017-01-01 Thread Peter Vince
January 2017 at 16:06, Peter Vince <petervince1...@gmail.com> wrote: > > > Hi Deirdre, > > > > Well done getting such a clear recording! Yes, the leap-second is > > effectively inserted after the DUT1 code on MSF as you say, even though > > that isn't c

Re: [time-nuts] Leap second - MSF time signal

2017-01-01 Thread Peter Vince
Hi Deirdre, Well done getting such a clear recording! Yes, the leap-second is effectively inserted after the DUT1 code on MSF as you say, even though that isn't crystal clear from the MSF spec document that David linked to. The DUT1 codes refer to the "current" minute, whilst all the rest

Re: [time-nuts] HP53132A Firmware Version 4613

2016-12-28 Thread Peter Vince
On 27 December 2016 at 20:50, Adrian Godwin wrote: > How similar are the 131A and the 132A ? Is it possible to upgrade a 131 > into 132 ? The one big difference I know of (there must be others) is that the 131A "only" has a time resolution of 500ps, whereas on the 132A it

[time-nuts] Could computers represent the timestamp differently?

2016-12-23 Thread Peter Vince
It seems to me that the major problem with the leap-second is the inability of current computer operating systems to represent it, and this is due to their using a second count since 1970 rather than writing it out as we would by hand. While it doubtless made sense in the days of floppy discs to

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

2016-12-12 Thread Peter Vince
Hi David, Yes, I have one you can have - I'll contact you off list. Regards, Peter (Surrey) On 12 December 2016 at 15:29, David J Taylor wrote: > Perhaps this is not too off-topic for the moderators? > > I'm looking for a 4-way

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

2016-11-23 Thread Peter Vince
Fantastic John - well done! Yes, I'll definitely put an order in as soon as possible. Regards, Peter (G8ZZR, London) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] 53132 replacement fan

2016-11-20 Thread Peter Vince
Hi John, I have a copy of the Agilent 53132 components list from 2007, but it seems to only cover the circuit boards :-( Anyway, for what its worth, I have put it in my dropbox as it is a 3.2 megabyte PDF - see:

[time-nuts] Excel logarithmic function (was Thermal impact on OCXO)

2016-11-16 Thread Peter Vince
Hello Lars, Just out of curiosity I yesterday put just the first thirty days (like in > the pdf mentioned below) and let Excel calculate the logarithmic function. > If I extrapolate that to 10 years it seems that the drift would be > 6E-13/day but as can be seen in the aging graph it was more

Re: [time-nuts] quartz drift rates, linear or log

2016-11-13 Thread Peter Vince
Hi Tom, Fascinating when you've done that linear fit - many of the plots now look very similar, suggesting environmental conditions? From that it would now be nice to log temperature, pressure, humidity, (& mains voltage?), and see if there is any correlation there. Wonderful to see

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

2016-11-04 Thread Peter Vince
Sorry Don, I beg to differ. The effects are often not noticeable in these days of digital television, but the noise-floor can definitely be seen to rise dramatically on a spectrum analyser. Regards (ex BBC TV, London) On 4 November 2016 at 21:51, Don Murray via time-nuts

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

2016-11-04 Thread Peter Vince
I don't think so Paul. That happens about the 12th of October in London (51.5° North), a few days later at higher latitudes, and a few days earlier at lower latitudes. Cairo, for instance, on about 30° North, was around the 5th of October. Peter On 4 November 2016 at 20:52, paul swed

Re: [time-nuts] Rare HP clock

2016-10-03 Thread Peter Vince
ebay item no.351861979923 http://www.ebay.com/itm/RARE-HP-H20-115BR-FREQUENCY-DIVIDER-DIGITAL-CLOCK- STANDARD-VINTAGE-TEST-/351861979923?hash=item51ec9bbb13:g:spMAAOSwpLNX8CsA On 3 October 2016 at 17:01, KA2WEU--- via time-nuts wrote: > I can not find the item on EBAY ,

Re: [time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

2016-09-17 Thread Peter Vince
Thanks guys - interesting answers all! Peter On 17 September 2016 at 18:00, Chris Albertson <albertson.ch...@gmail.com> wrote: > On Fri, Sep 16, 2016 at 4:44 PM, Peter Vince <petervince1...@gmail.com> > wrote: > > > Can I ask why PPS pulses are so narrow? It

[time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

2016-09-16 Thread Peter Vince
Can I ask why PPS pulses are so narrow? It makes them difficult to see on a 'scope, and difficult to detect on a PC. And, as Bob said, far less obvious if you trigger off the wrong edge. Peter On 16 September 2016 at 23:55, Bob kb8tq wrote: > > Hi > > Most PPS signals

Re: [time-nuts] Lady Heather's Tbolt oscillator auto-tune function

2016-09-14 Thread Peter Vince
Hi Scott, The x-axis is shown in the dark blue text to the right of the big time display - 60 minutes total, 5 minutes per division. Peter On 14 September 2016 at 03:52, Scott Stobbe wrote: > Pardon my lack of knowledge regarding Lady Heather, what is the

Re: [time-nuts] Z3801A gps week rollover

2016-09-08 Thread Peter Vince
That makes sense - thanks guys! Peter On 8 September 2016 at 22:53, Hal Murray wrote: > > petervince1...@gmail.com said: > > Can I just ask why the Z3801As are having week roll-over problems now - > I > > didn't think it was 2048 weeks since GPS "zero-hour"

Re: [time-nuts] Z3801A gps week rollover

2016-09-08 Thread Peter Vince
Can I just ask why the Z3801As are having week roll-over problems now - I didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th of April 2019? Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Manual for Trimble Placer Gold APU

2016-08-09 Thread Peter Vince
of GPS satellites. I have found a sales specification sheet, and an installation manual on the web, but can't find an ops manual that will describe all the command sequences etc. that can be performed. Thanks, Peter Vince ___ time-nuts mailing list

[time-nuts] BBC Bush House Patek Phillipe clock system on ebay

2013-02-19 Thread Peter Vince
of the group might be interested in giving it a good, loving home :-) TTFN, Peter Vince (London, England) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] [FMT-nuts] LightSquared is Toast!!

2012-02-15 Thread Peter Vince
See: http://www.nytimes.com/2012/02/15/business/media/fcc-bars-airwave-use-for-broadband-plan.html?_r=1scp=3sq=lightsquaredst=cse On 15 February 2012 14:34, David McClain d...@refined-audiometrics.comwrote: Yeaaa! LightSquared GPS-band broadband is gone. Big article on the front page of

[time-nuts] Fwd: [FMT-nuts] LightSquared is Toast!!

2012-02-15 Thread Peter Vince
An article in Inside GNSS expands on the story.. http://www.insidegnss.com/node/2951 Peter ___ 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

[time-nuts] Info request for some FEI modules

2012-02-02 Thread Peter Vince
Standard FE-350A Battery Power Supply Module FE-150A DTF-Module (Can replies be direct to me please, to save annoying everyone on the list.) Thank you, Peter Vince (London, England) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-19 Thread Peter Vince
Hello all, I have just scanned the copy I bought from Amazon the other day (second revised edition, 1999). It makes quite a large file, so uploaded it to Flickr - which seems to insist on resizing it! The largest size is at:

Re: [time-nuts] Averaging Location for Position Hold

2011-09-14 Thread Peter Vince
I hear that there is a hobby where people photograph these and collect the photos.  Seems pointless in the city but many are on mountain peaks and other places with good views.  The hobby is more reasonable if you find them without using GPS.  The USGS maps are good enough o put you within 10

Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues

2011-07-07 Thread Peter Vince
But surely it doesn't matter David? There is nothing critical in there, it's just a display. As long as the voltage is within the processor's operating window, that is surely good enough? Peter On 7 July 2011 15:48, David VanHorn d.vanh...@elec-solutions.com wrote: Vf is highly dependent on

[time-nuts] Fwd: BIPM Annual Report on Time Activities 2010

2011-06-28 Thread Peter Vince
The following report just released by the BIPM may be of interest. It includes a section detailing all standard frequency and time broadcasts. -- Forwarded message -- Dear Colleague, The BIPM Annual Report on Time Activities containing the information for 2010 is now available

Re: [time-nuts] Fluke PM6681 triggering

2011-06-09 Thread Peter Vince
Hi Rex, You could try asking the guys at Pendulum. A couple of them came down a gave a talk at the UK's National Physical Laboratory Time Frequency Club meeting a few years ago and were very interesting and approachable. It looks like they might have been swallowed by Spectracom now -

Re: [time-nuts] Timecode clock for acution in UK

2011-03-10 Thread Peter Vince
Thanks for pointing this out David. I already have a couple, and they are very nice - even keeping good time (domestically speaking - a couple of seconds per month!) without the EBU/SMPTE time code reference. (Locking to mains frequency (50 or 60Hz) is possible from a DIL switch on the back

Re: [time-nuts] Archiving Timing Data

2011-01-10 Thread Peter Vince
Would a TSB (Tab Separated Value) format be preferable? Full-stops and commas are used in numbers as decimal and thousands separators (or vice versa), so using tab character would avoid any problems with commas in the actual data (and make it is a bit easier to quickly eyeball when viewed in a

Re: [time-nuts] Lady Heather Wish-list

2010-12-04 Thread Peter Vince
I echo Bob's thanks to the authors of this invaluable program. I like to have the satellite path display to the right of the graph panel, but haven't managed to set the configure file to do that automatically, and always have to issue the gb and gm commands after running the program - have I

[time-nuts] Info required on Oak OCXO

2010-09-28 Thread Peter Vince
I have acquired on old Oak Frequency Control 10MHx OCXO, but have been unable to find any info on it, and was wondering if anyone was familiar with it? The label on top has the following on it: OFC 2940221-2 10.00 MHz 11628-13147 9952 It is a 2 inch by 2 inch by 1 inch unit. It seems

Re: [time-nuts] [qs1r] Looking for good, cheap, external reference

2010-09-22 Thread Peter Vince
Hello Lester, To expand on Bob's message a little, do you need medium to long-term accuracy (for a frequency counter reference for example), or something that is both accurate AND has low phase noise, suitable for multiplying up to GigaHertz, say, for communications? Particularly if the

Re: [time-nuts] Prologix GPIB controllers

2010-08-02 Thread Peter Vince
...I'm on the right path (I think) with measuring time but it seems to lead to insanity.  Is this correct? 73 Brice KA8MAV You've bought a lab-coat to wear around the house, and you're asking that? I think you're already there. Welcome to the mad house :-)) Peter

Re: [time-nuts] 5350A versus 53131A

2010-08-02 Thread Peter Vince
Bonjour Loïc, I am very happy with the 53131 and 53132 that I have (the latter have 150ps resolution, as opposed to the 500ps resolution of the '131). As well as a GPIB port, they also have a simple D9 serial port, and can very easily be configured to output each reading down the serial

Re: [time-nuts] Basic question regarding comparing two frequencies

2010-07-26 Thread Peter Vince
Sorry Bert, I don't follow the last part about the 100Hz - can you explain further please? (and is that 100.00 or 100.01 Hz?) Peter On 26 July 2010 14:27, ewkeh...@aol.com wrote: Hi,  ten years ago not having a super counter I copied the input circuit  of the Austron 2110 that using

Re: [time-nuts] Pictic II boards are here !

2010-07-21 Thread Peter Vince
me know the final cost, including postage over the big pond, I'll get PayPal to do their thing. Can you please tell me what size the boards are, then I can get some appropriate padded bags for onward despatch. TTFN, Peter Vince (England) On 20 July 2010 23:08, Stanley

Re: [time-nuts] Lab Test Equipment

2010-07-20 Thread Peter Vince
Hello, and welcome to the group, and what I find an endlessly fascinating subject. Said's suggestion of using a 'scope is fine, but is mind-numbingly tedious (I've done it!) I think you need a frequency counter/timer whose readings can be output to a computer for subsequent analysis. There are

Re: [time-nuts] surface mount (was PICTIC II Parts from Mouser)

2010-07-20 Thread Peter Vince
On 20 July 2010 18:51, Chuck Harris cfhar...@erols.com wrote: ...I use the little finger on my tweezers hand as a balance point for my hand.  Just the act of having it touch the stage, or board removes all of the jitter. If only our 1PPS signals had a little finger that could rest somewhere

Re: [time-nuts] PICTIC Backend

2010-07-15 Thread Peter Vince
Hi Stanley, You might also like to consider BBC BASIC for Windows (http://www.rtrussell.co.uk/bbcwin/bbcwin.html), developed from the language written for the Acorn BBC Micro in the early 80's, the author, Richard Russell, is actively maintaining and enhancing it, and supports a Yahoo Group

Re: [time-nuts] Loran-C Anthorn

2010-07-12 Thread Peter Vince
Laboratory (peter.whibberley (at) npl . co . uk) - if he can't tell you, he will certainly know who can! Regards, Peter Vince On 12 July 2010 00:40, asma...@fc.up.pt wrote: Greetings to the group. I would like to have the exact (and trustworthy...) WGS84 coordinates

[time-nuts] 74AC175PC availability

2010-07-12 Thread Peter Vince
Previous commentators have reported a shortage of this part, but a quick Google brought up Quest Components in Industry, California, who supposedly have over 2000 in stock (http://tinyurl.com/2wxk6lh). I've not tried ordering from them as I'm on the other side of the Atlantic, perhaps a member

Re: [time-nuts] GPS Timing Source -- looking at buying

2010-07-09 Thread Peter Vince
Hal (and everyone) In television and radio broadcasting we use a time code that is a Manchester-encoded 2000 bps (50 Hz countries) or 2400 bps (60 Hz countries) signal which has been low-pass filtered (~7.5 KHz) so that it can be directly recorded on an analogue audio track. EBU is the

Re: [time-nuts] Long period variation of GPS PPS timing?

2010-07-04 Thread Peter Vince
On 2 July 2010 09:05, Paul Nicholson vlf0...@abelian.org wrote: ... Well now, this sure looks to me like a GPS effect. I think I'd better order another GPS, a different type, maybe a GlobalSat MR-350P, or something, for comparison. Recommendations? Hello again Paul, I have just

Re: [time-nuts] Yet another GPSDO - locking to 10MHz

2010-07-04 Thread Peter Vince
Hi Murray, Why did you use such a large division factor - or any for that matter? Could you not just have used a PLL with very long time constant running at 10 MHz? Peter On 27 June 2010 20:14, Murray Greenman murray.green...@rakon.com wrote: I have a design which locks a high

Re: [time-nuts] Pic programing for the PICTIC II

2010-07-02 Thread Peter Vince
On 2 July 2010 16:37, Stanley Reynolds stanley_reyno...@yahoo.com wrote: Better ? How many16f688s are we talking here? My thinking is less than 10 as only two people have asked. Don't know how many have not asked. Thanks snip ___ time-nuts

Re: [time-nuts] Pic programing for the PICTIC II

2010-07-02 Thread Peter Vince
-programmed PIC please, if someone can arrange that. Or ideally, a complete kit of parts, but as the previous correspondent has written, I appreciate that is a lot of work. Thanks, Peter Vince (London, England) ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] Long period variation of GPS PPS timing?

2010-07-01 Thread Peter Vince
Hi Paul, Others on this list will reply more authoritatively, but I don't believe that cyclic variability is GPS - I've not noticed such a thing on any of the systems I monitor. Can you carefully monitor temperature and PSU voltage, and maybe find a correlation there? Peter

Re: [time-nuts] Thunderbolt test results

2010-06-12 Thread Peter Vince
Have you played with the damping factor Brian? Peter ___ 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] Thunderbolt test results

2010-06-11 Thread Peter Vince
HI Bob, 10 nanoseconds at the bottom, up to 10 microseconds at the top, in three logarithmic sections. Donal: Is the time-constant at its default of 100 seconds, and was the above plot taken shortly after turning it on? There has been lots of talk on here about tweaking the performance.

Re: [time-nuts] What time is it anyway?

2010-03-28 Thread Peter Vince
I think that is the BIPM (http://www.bipm.org/en/home/) in association with the IERS (http://hpiers.obspm.fr/) Peter On 28 March 2010 10:29, Steve Rooke sar10...@gmail.com wrote: What puzzles me is who is the keeper of legal time for the other 93.4% of land mass and 95.5% of population of the

Re: [time-nuts] Making a HP 10811 better

2010-03-27 Thread Peter Vince
Warren, If you turn over an oscillator, is the frequency change completely reversible (to your under 1e-12 resolution) when it is restored? Thinking aloud, if an hour-glass is turned over twice, the final level will be the same, but the grains will be mixed. A quartz crystal, however, is

Re: [time-nuts] Choke Ring Design for L1

2010-03-14 Thread Peter Vince
As I understand it, the GPS signals are circularly polarised, and so surely reflections will reverse the sense of that polarisation such that the antenna will be insensitive to them? Maybe Warren's simple pie dish is working by shielding the antenna from the true MULTI-path reflections, and any

Re: [time-nuts] Thunderbolt antenna?

2010-03-13 Thread Peter Vince
slightly better executed? Regards, Peter Vince (London, England) On 13 March 2010 02:52, Mark Sims hol...@hotmail.com wrote: Yep,  it's a standard choke ring antenna.  It's optimized for L1 freqs.   Leica also rebranded and sold it. I have tested 6 different choke ring

Re: [time-nuts] 1PPS correction from HP58534A GPS Timing Antenna

2010-02-18 Thread Peter Vince
Hello Don, The sawtooth is caused by the receiver's local oscillator not being locked to the GPS signal, and thus the 1PPS pulse, which is derived from the nearest available edge on that oscillator, cannot be exactly correct. Adjusting the antenna delay just wouldn't work because of that.

Re: [time-nuts] No 1 PPS output on a Tbolt

2010-02-12 Thread Peter Vince
Hi Robert, I put a dual-colour (red-green) LED in a BNC plug for just this sort of purpose. No series resistor - the 50-ohm source impedance limits the current nicely. With dual-colour, I can see both positive and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very dim, but

Re: [time-nuts] lpro schematics

2010-01-13 Thread Peter Vince
Hello Alfredo - see Didier Juges' manuals page: http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05%29_GPS_Timing/Datum/LPRO Regards, Peter 2010/1/13 Dott. Alfredo Rosati alfredoros...@alice.it: I am looking for schematics LPRO-101. I would replace the original  internal  TCXO, low quality

Re: [time-nuts] Lady Heather Software

2010-01-12 Thread Peter Vince
Latest official version (2.0) can be downloaded via http://www.thegleam.com/ke5fx/heather/readme.htm The 3.0 beta version is at http://www.ke5fx.com/heather/beta.exe 2010/1/12 Richard W. Solomon w1...@earthlink.net: Where will I find the latest version ? Thanks, Dick,

Re: [time-nuts] Prologix GPIB Controllers on sale at SparkFun

2010-01-05 Thread Peter Vince
I have recently discovered that SparkFun do a USB Weather Board, which has sensors for temperature, pressure, humidity, and light. see: http://www.sparkfun.com/commerce/product_info.php?products_id=8311 Priced at $124.95, I have ordered one already (pity I didn't know about the discount

Re: [time-nuts] Subject: [OT] short run cable assembly vendor?

2009-12-31 Thread Peter Vince
Mary, the owner of ebay store QualityChinaGoods, had some RF pigtails for sale, but with the wrong connector on one end for my use. She very helpfully made up a small batch to match my needs, and put up a special Buy-It-Now auction for me. Peter Vince (G8ZZR, London, England

Re: [time-nuts] Timenoob - Cheap and simple 10MHz reference

2009-12-29 Thread Peter Vince
Semiconductorstore.com also have the CW25-TIM at a cheaper price ($64 vs $89) and it is more sensitive, so can possibly work indoors. They both, apparently, use the same NavSync chips, so does the '25 have disadvantages I haven't spotted? Peter 2009/12/28 Hal Murray

Re: [time-nuts] Can a quartz crystal go off by 2% ?

2009-12-29 Thread Peter Vince
Hi Rob, Actually they are controlled from a low bit-rate signal phase-modulated onto Radio-4 long-wave (198KHz). If you have an SSB or CW receiver that tunes down to that frequency, switch on the BFO and look at the output on something like Spectrum Lab, and the phase modulation is readily

Re: [time-nuts] chip scale atomic clock

2009-12-29 Thread Peter Vince
2009/12/26 Robert Lutwak lut...@alum.mit.edu: ... CSAC is intended for portable battery-powered operation. Surely your basement has the space and wallplug power to support an LPRO. (p.s. don't cool the damn thing, heat it). ... Hi Robert, Do I understand you are suggesting heating an

Re: [time-nuts] Timenoob - Cheap and simple 10MHz reference

2009-12-29 Thread Peter Vince
a standard deviation of 5 ns with a min-max range of 30 ns.  This is without sawtooth correction because this unit doesn't support it - even with the Motorola software. Ed - Original Message - From: Peter Vince pvi...@theiet.org Date: Tuesday, December 29, 2009 10:21 am Subject: Re: [time

Re: [time-nuts] Timenoob - Cheap and simple 10MHz reference

2009-12-29 Thread Peter Vince
Oh Good Lord - not paying attention to the units! Sorry guys! Peter. 2009/12/29 Bruce Griffiths bruce.griffi...@xtra.co.nz: -185dBW = -155dBm so both sensitivity measures are equivalent. Bruce Peter Vince wrote: Thanks Ed, yes, I hadn't looked closely enough at the pictures

Re: [time-nuts] Tbolt Damping setting

2009-12-16 Thread Peter Vince
should, at least, be valid out to a few thousand seconds. I also plan to try reducing the signal level threshold (from the current 4AMU) as recently suggested, and try to see some quantifiable results. TTFN, Peter Vince (G8ZZR, London, England

Re: [time-nuts] Tbolt Damping setting

2009-12-15 Thread Peter Vince
Thank you for your explanation. Your Lady Heather plot prompts a couple of questions though: 1) Presumably you created the 40ns phase step by changing the output timing offset? 2) Presumably, again, the plotted data is from the self reported data from the Thunderbolt? I have been running a

Re: [time-nuts] LORAN C simulator operational

2009-12-08 Thread Peter Vince
) was likely a more reliable source of information. So, don't throw out all your Austron 2100's yet - all is not yet lost! Regards, Peter Vince (London, England) (Can I just clarify: the opinions above are mine, obtained from the floor of the meeting today, and don't represent

Re: [time-nuts] Jupiter GPS Question

2009-12-02 Thread Peter Vince
Talking of which, I have been wondering if our beloved Thunderbolts could handle WAAS/EGNOS. I can't see any way to configure the current software - doubtless an upgrade would be required, but does the hardware have the capability? Does anybody have any thoughts? TTFN, Peter

Re: [time-nuts] Jupiter GPS Question

2009-12-02 Thread Peter Vince
Thanks Bjorn - I was afraid of that! TTFN, Peter 2009/12/2 b...@lysator.liu.se: SBAS (WAAS/EGNOS/etc) use L1 carrier frequency and compatible PRN codes, but the datamessage goes at a higher rate (200bps (?)) than the normal GPS which uses 50 bits per second. This means that

[time-nuts] Who is the recommended seller of manuals?

2009-11-29 Thread Peter Vince
, Peter Vince (London, England) ___ 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] Who is the recommended seller of manuals?

2009-11-29 Thread Peter Vince
That was it! Magic - thanks Robert. Peter 2009/11/29 Robert Atkinson robert8...@yahoo.co.uk: Artek Media http://www.artekmedia.com/ --- On Sun, 29/11/09, Peter Vince pvi...@theiet.org wrote: From: Peter Vince pvi...@theiet.org Subject: [time-nuts] Who is the recommended seller

[time-nuts] GPS Jamming Interference in London, February next year

2009-11-25 Thread Peter Vince
-interference/?mode=0 Regards, Peter Vince ___ 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.

[time-nuts] LORAN rescued by Congress?

2009-11-25 Thread Peter Vince
If I read it right, Congress in the USA has overturned the President's FY2010 statement to keep LORAN going as a backup to GPS. See: http://pnt.gov/policy/legislation/bills.shtml#loran Regards, Peter Vince ___ time-nuts mailing list -- time-nuts

[time-nuts] Does anyone have an Austron 2055A manual please?

2009-11-04 Thread Peter Vince
Would anyone have a manual for the Austron 2055A Phase Microstepper please? Either a PDF, or a paper manual that they are willing to part with (I don't have scanning facilities). Any costs happily reimbursed. Thank you. Peter Vince (G8ZZR, London, England

Re: [time-nuts] FE-5680 Frequency Settings

2009-11-02 Thread Peter Vince
Hi Rob, Some information in Didier's manuals archive at: http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05%29_GPS_Timing/FEI TTFN, Peter Vince 2009/11/2 Rob Kimberley robinkimber...@btinternet.com: Anyone got info on changing frequency of DDS on FE-5680? Would like

Re: [time-nuts] EU opens up Egnos system for public use

2009-10-18 Thread Peter Vince
Hi Alberto - have you seen the ESA website describing the system: http://www.esa.int/esaNA/egnos.html Regards, Peter On Fri Oct 16 16:49 , Alberto di Bene dib...@usa.net sent: Anybody has some more info about this ? http://tinyurl.com/yjeaodn Alberto I2PHD

Re: [time-nuts] VLF time stations in Europe

2009-09-30 Thread Peter Vince
waterfall display on a spectrum analyser program, you can see a repeating pattern! Peter Vince (G8ZZR, London) On Wed Sep 30 20:43 , Magnus Danielson mag...@rubidium.dyndns.org sent: Fellow time-nuts, I am trying to make an overview of VLF time stations that can reach Sweden and may

Re: [time-nuts] STEL-1173

2009-09-24 Thread Peter Vince
Hi Magnus, I was surprised to read that you had needed help to resolve the problem as, not to over-inflate your ego, you seem to be very experienced and knowledgable. So don't tease us - what was it? TTFN, Peter Vince (G8ZZR, London, England) On Thu Sep 24 1:04 , Magnus

Re: [time-nuts] More Z3801/Tbolt comparisons

2009-09-04 Thread Peter Vince
Hi Mark, If we are being this careful, I wonder if you should use a SIDEREAL day of averaging - 236 seconds short of a solar day ? TTFN, Peter Vince (G8ZZR, London, England) On Thu Sep 3 19:40 , Mark Sims hol...@hotmail.com sent: ... The next version of Lady Heather

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