Re: [time-nuts] WTB: GPS Antenna Splitter

2014-10-06 Thread mike cook
Le 7 oct. 2014 à 03:09, Bob Camp a écrit : Hi Missed the survey question… If a ns in free air is about 1 foot (30 cm), then you probably want a survey that is better than 6” to keep the error down. You do not want to have the antennas on top of each other, so yes, the GPS will need a

Re: [time-nuts] GPS jump

2014-10-09 Thread mike cook
Le 10 oct. 2014 à 03:09, Bob Camp a écrit : Hi GPS is steered by the Air Force last time I checked. A really good place to check is the NIST Time and Frequency pages that show both real time and historical data for each GPS sat compared to NIST time:

Re: [time-nuts] GPS once a day issues ?

2014-10-20 Thread mike cook
The constellation may repeat at 12hr intervals , but at any static position you will only see one per day , no? , the other being 180 degrees way. I only get one regular bump. Le 20 oct. 2014 à 09:43, Magnus Danielson a écrit : Bob, Since the satellite orbit the earth with a period of 11

Re: [time-nuts] 10MHz Rubidium reference source for frequency counter

2014-10-29 Thread mike cook
Le 29 oct. 2014 à 08:32, Karen Tadevosyan a écrit : Thanks again for your explanations and advices. I raised this question as a ADEV measurement result of my GPSDO/NEO-7M is about 1E-9 for tau = 1sec http://www.ra3apw.ru/wp-content/uploads/2014/10/NEO7M_OCXO_MV89A_10M_2h0_ADEV.jpg and it

Re: [time-nuts] ***SPAM*** 53230A input channel fault?

2014-11-19 Thread Mike Cook
Le 19 nov. 2014 à 09:47, Anders Wallin anders.e.e.wal...@gmail.com a écrit : Hi all, I have a 53230A that behaves differently on ch1 and ch2. With ch2 at DC/1Mohm/postive-slope/1V it triggers ok on my PPS signal and shows e.g. a pusle-width measurement etc. The same signal connected

[time-nuts] anyone tried the cheap Lea-6T modules seen on eBay?

2014-11-25 Thread Mike Cook
You may have seen them as in http://www.ebay.fr/itm/Ublox-LEA-6T-GPS-Module-w-Compass-for-APM2-5-APM2-6-Flight-Controller-Multirotor-/271641375221?pt=UK_ToysGames_RadioControlled_JNhash=item3f3f1671f5 There are other sellers with the same. My idea was to see if one was suitable as a 1PPS locking

Re: [time-nuts] 12.8 MHz OCXO

2012-11-24 Thread mike cook
Le 24 nov. 2012 à 09:26, Joseph Gray a écrit : Can anyone recommend an inexpensive 12.8 MHz OCXO that outputs a sine wave? I've looked online, but the only ones I find costs hundreds of dollars. Anything 0.25 ppm or better is fine. A Vcc of 5-13.8 VDC preferred. An uncommon OCXO freq. If

Re: [time-nuts] Strange DCF77 master clock data

2012-12-09 Thread mike cook
Le 09/12/2012 11:28, Tom Harris a écrit : Greetings Time Nuts. Time related, but unusually so: I am examining the DCF77 (see http://en.wikipedia.org/wiki/DCF77 for a refresher) data output from a master clock intended to drive a series of slave clocks operated from 24V DC, interrupted by 100ms

Re: [time-nuts] Strange DCF77 master clock data

2012-12-10 Thread mike cook
2012 23:24, mike cook mc235...@gmail.com wrote: Le 09/12/2012 11:28, Tom Harris a écrit : Greetings Time Nuts. Time related, but unusually so: I am examining the DCF77 (see http://en.wikipedia.org/wiki/**DCF77http://en.wikipedia.org/wiki/DCF77for a refresher) data output from a master clock

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

2012-12-14 Thread mike cook
gmail did the same for me Sahra but it is not systematic. This mail from you was classified ok, but Bert Kehren's got flagged. Le 14 déc. 2012 à 19:38, Sarah White a écrit : Sorry, this is off-topic: Wondering I'm if anyone else had part of this particular conversation / thread (Synergy

Re: [time-nuts] RaspberryPi and RADclock

2012-12-14 Thread mike cook
Le 14 déc. 2012 à 21:12, paul swed a écrit : I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Looking at the doc on the synclab.org site it appears that it can in the sense that you can configure clients with radclock running to send

Re: [time-nuts] Just for Fun - Synergy Systems SSR-6T PPS Comparison

2012-12-19 Thread mike cook
Le 20 déc. 2012 à 07:07, David Martin a écrit : http://youtu.be/kOG9ImT2lvY It wouldn't open for me... private ___ 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] OT: Mayans

2012-12-19 Thread mike cook
Please help. It is not like you have plans for the weekend. Keep calm, carry on.. Coincidence and timely advice from lady heather: Just noted that the last date of the current long date cycle, 19.19.17.19, happens in GPS week 1719. inline: longdate.JPG inline: world-ends-tomorrow.JPG

Re: [time-nuts] What time...

2012-12-20 Thread mike cook
Le 20 déc. 2012 à 18:16, Burt I. Weiner a écrit : Excuse me for asking... Can anyone tell me what time the world is supposed to come to an end tomorrow? We have a lot of shopping to do and thought it would be nice to be home and watch it on happen on TV. I think its nigh. Here in

Re: [time-nuts] NTP server system done -- Thanks!!!

2013-01-27 Thread mike cook
Le 28 janv. 2013 à 00:46, Frank Hughes a écrit : snip The NTP server works great!! The only real difficulty is with the FreeBSD, it deletes the links to the PPS and PALISADE drivers at every reboot of the system, and can only communicate w/ the router if I use DHCP. to make device links

Re: [time-nuts] Smart fiber-optic cable ( a reference to Hp's smart clock )

2013-02-04 Thread mike cook
I think someones on it. check out http://www.ospmag.com/issue/article/Timing-Is-Everything Le 4 févr. 2013 à 23:09, Stanley a écrit : If a fiber-optic cable had temperature sensors either installed with or embedded inside of this could make for better modeling changes in delay making more

Re: [time-nuts] Atomic Watch.

2013-05-01 Thread mike cook
You are not wrong. I noticed the error myself. There no radioactive decay involved. These devices were discussed in detail a while back here. Lots of drooling and wringing of empty wallets. Le 1 mai 2013 à 17:40, Sarah White a écrit : On 5/1/2013 8:43 AM, Stephen Tompsett (G8LYB) wrote:

Re: [time-nuts] Cesium wrist-watch-lite

2013-05-01 Thread mike cook
I inquired with Symmetricom here in France just after their announcement and was quoted 1500euros for the development board. Le 1 mai 2013 à 17:45, Volker Esper a écrit : Cool. Is the Symmetricom CSAC SA.45s available to mere mortals? Which price could we expect? Volker Am

Re: [time-nuts] Precise positions for GPSDOs

2013-05-02 Thread mike cook
I have a worse than optimal antenna location for my t-bolt and that just choked on being fed the google earth location which is 7.5 meters away. Le 2 mai 2013 à 14:22, Poul-Henning Kamp a écrit : In message CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart Cobb

Re: [time-nuts] GPS position survey

2013-05-05 Thread mike cook
Le 5 mai 2013 à 21:18, Chuck Forsberg WA7KGX N2469R a écrit : When doing a position survey, does Lady Heather have to be running? Or does the Thunderbolt do it by itself? Good question. I would have thought that once started, the survey would complete even though LH was stopped/started,

Re: [time-nuts] gpsd 1pps pulse?

2013-05-08 Thread mike cook
Le 7 mai 2013 à 20:00, Sarah White a écrit : On 5/6/2013 9:38 AM, Chuck Forsberg WA7KGX N2469R wrote: I would like to set up a NTP server on a machine running Linux (currently Korora 18). What are the requirements for the 1 PPS signal fed to the carrier detect pin? I presume the 10 us

Re: [time-nuts] Time source for indoor standalone PC

2013-05-17 Thread mike cook
Le 17 mai 2013 à 06:45, Grant Waldram a écrit : This is inside a security-fob protected room. I can't get GPS signals in there, and the Australian radio clock network was shut down about ten years ago. Our CDMA network was turned off in 2008. Right now all I can think of is GSM, and while

Re: [time-nuts] Net4501's cheap...

2013-05-23 Thread mike cook
Le 23 mai 2013 à 03:31, Jim Sanford a écrit : Do you have any documentation on how to use them? I have one that I bought to be an internet access point with a verizon card, failed due to verizon not complying with the RFCs. Love the device, but no information on ports, etc. Might want

Re: [time-nuts] Good (cheap) PIC chip choice for project?

2013-05-25 Thread mike cook
Le 25 mai 2013 à 22:53, Jim Lux a écrit : On 5/25/13 10:55 AM, Chris Albertson wrote: 3) the Pi is almost PC-like and very easy to use. Costs about $40 and requires a HDMI or DVI monitor.. If you don't need graphics it runs fine headless using putty to ssh into.

Re: [time-nuts] TimeKeeper?

2010-02-22 Thread mike cook
Le 22/02/2010 03:02, Alexander Sack a écrit : Has anyone seen this: http://www.drdobbs.com/linux-open-source/223000197;jsessionid=LEYQTVQD4D24TQE1GHPCKH4ATMY32JVN?pgno=1 Excuse if its been talked about but I don't see it in my mail archives. I thought some of the ntpd'ers on this list might

Re: [time-nuts] Wrist Watch for Time Nuts

2010-02-25 Thread mike cook
TI seem to be pushing this platform. I got a publicity mail from Farnell France saying that they are offering 10 development kits in a free draw. Le 25/02/2010 21:45, Ronald Held a écrit : I have that watch but have not had the time to learn how to program it. Instead of a wireless daily

Re: [time-nuts] Azimuth/elevation dependent satellite masking

2010-03-16 Thread mike cook
This issue seems to have been studied before and some tools exist to predict the SV visbility in relation to local obstructions. ref: http://proceedings.esri.com/library/userconf/proc05/papers/pap1615.pdf I can't locate the freeware Leica tool cited in the paper though . ArcGIS looks like a

Re: [time-nuts] Most accurate small crystal

2010-05-28 Thread mike cook
This I think http://www.allanstime.com/Publications/DWA/Science_Timekeeping/TheScienceOfTimekeeping.pdf Le 28/05/2010 08:32, Hal Murray a écrit : Where do you want to start? Isn't that HP/Agilent App-Note with the three wrist-watches the place to start ? 1289 or something ?

Re: [time-nuts] More from the obsolete gps file: oncore nmea

2010-05-30 Thread mike cook
Hi Norm, hmm. doc says that the command willl switch the port to 4800, so you should see no coherent data at all immediately that the command is executed. Were you still getting 9600 data without resetting the device? Would it respond to MBP commands after the @@Ci ? Mike Le 30/05/2010

Re: [time-nuts] More from the obsolete gps file: oncore nmea

2010-05-30 Thread mike cook
Norm, I am not sure about the M12+ as I think that had NMEA support from the start. GT+ also does but there are GT firmware versions that do not support NMEA. Are ou sure it is a GT+ . Motorola give GT plus model numbers R3211G11x, R3111G11xn. Does that fit? If you use the ID command,

Re: [time-nuts] More from the obsolete gps file: oncore nmea

2010-05-30 Thread mike cook
I see high is a relative term. em-406a seems to be spec'd for 18000 meters. where are you going? Le 30/05/2010 22:35, normn3...@stny.rr.com a écrit : Hi all!! Not all oncores are created the same. I THINK (based on inference)that some of the GT+ receivers don't support nmea. Bad luck on my

Re: [time-nuts] DCF77 clock with UTC display

2010-06-05 Thread mike cook
DCF77 is transmitted in CET/CEST and so receivers generally just display the received data with some allowing other TZ offsets as it can be received in the UK for example. I also lucked out when looking for one where daylight savings adjustments could be removed . Le 05/06/2010 23:37,

Re: [time-nuts] crystal oscillators TPLL

2010-06-25 Thread mike cook
Le 25/06/2010 06:40, Steve Rooke a écrit : ...snip... Perhaps more like yourself would express the same sentiment publicly here, that may be the encouragement that Warren needs to take that plunge. So please speak up and add your support to Warren. Thank you. I'll add my vote. If we had

Re: [time-nuts] crystal oscillators TPLL

2010-06-25 Thread mike cook
oops.. thumbs instead of fingers Le 25/06/2010 10:15, Sanjeev Gupta a écrit : On Fri, Jun 25, 2010 at 16:02, mike cookmike.c...@orange.fr wrote: Heaven forbid that I start more mud slinging, but I think that Bruce did not take enough notice of Warrens assertion that his method was good

Re: [time-nuts] Loran-C Anthorn

2010-07-12 Thread mike cook
note that at 54,9 degrees, one least significant decimal digit in the latitude/longditude is approx 11cm/6cm . That might well explain why there are multiple references. Le 12/07/2010 11:46, Peter Vince a écrit : Hello Antonio, Looking at the aerial photographs on Google Maps, the

Re: [time-nuts] A different timenuts interest

2010-07-22 Thread mike cook
As a number of examples have been referenced in the reply to the original post, I will add a note on one of pendulums that Foucault himself constructed. Foucaults original experiments used shortish cables, but Napoleon wanted a more prestigeous affaire. It was originally installed by

Re: [time-nuts] A different timenuts interest

2010-07-22 Thread mike cook
I thought that might have caused some confusion ;) . The bob, of course. I guess it can be replaced, but it is a shame that as a historical instrument, it could not have been better cared for. All is not lost though, as one of his smaller original pendulums is swinging in the Panthéon it

Re: [time-nuts] Z38xx and z3805

2010-08-01 Thread mike cook
Hi Bob, I have a Z3801A and I am not sure whether the SCIP commands are the same as for the Z3805A. There must be some differences related to the channel numbers and serial post configuration at least I would expect. I think the following apply. You need to not only be able to provide a

Re: [time-nuts] Regulating a pendulum clock (Jim Palfreyman)

2010-08-08 Thread mike cook
Check out Bryan Mumfords page. http://www.bmumford.com/clocks/em2/index.html Le 08/08/2010 11:14, Steve Rooke a écrit : I was rather more thinking of the setup that Don was suggesting as not many domestic clocks have a seconds pendulum and it would otherwise take dividing down a referenced

Re: [time-nuts] Regulating a pendulum clock

2010-08-09 Thread mike cook
Le 09/08/2010 18:46, Bob Holmstrom a écrit : Food for thought. I find it interesting that no one has suggested alternatives to improving the performance of a pendulum clock other than controlling it with a higher performance clock. If the goal is a better clock why not attempt to

Re: [time-nuts] What's the lifetime for a HP Z3801a?

2010-08-29 Thread mike cook
Le 29/08/2010 04:26, Hal Murray a écrit : Have a pair of Z3801a receivers and GPSCon. The running time readout for both is greater than 16,000. They were around 5,000 when I got them from somewhere south of here. I assume the units are hours, but my copy of the manual doesn't say what the

Re: [time-nuts] Z3801A version issues - was Re: Substitute GPS in a Z3801A

2010-08-29 Thread mike cook
would that have shown up in a firmware version id change? try *IDN? and see if there is any correlation Matthew. Le 30/08/2010 03:23, paul swed a écrit : I seem to remember a rollover about then that obsoleted older gps units. On Sun, Aug 29, 2010 at 5:40 PM, Matthew

Re: [time-nuts] Does GPS time reception work everywhere all of the time?

2010-08-31 Thread mike cook
Hal's response was quite complete, but he missed one essential and often missed parameter. Redundency. I have been working for years in operating system support for major international computer constructors and it amazes me how often I came across equally large international clients who had no

Re: [time-nuts] Nano Gyroscope

2010-10-06 Thread mike cook
Le 06/10/2010 08:07, Gerald Molenkamp a écrit : Hi All, Time, GPS and movement plays a big part in most discussions. Each day brings something new and fantastic in the world of science, it just makes you think where it will take us. The naivity of scientists amazes me. The guy says If you

Re: [time-nuts] Question about SoundCard stability?

2010-10-13 Thread mike cook
Le 13/10/2010 03:41, David McClain a écrit : Hi, No you aren't missing anything... except that I *DON'T* see the 5 mHz drift that one should expect. Hence my contention that relying on interpolated frequencies from FFT peaks and their adjacent bins is bogus when the FFT bin size is as

Re: [time-nuts] New (refurbished) LPRO-101 GPSDO

2010-10-17 Thread mike cook
Le 17/10/2010 11:55, David McClain a écrit : I just received my LPRO-101 with a GPSDO control on it, from TenMhz.com. After fiddling with getting a good placement for the GPS antenna, so that it doesn't keep losing the satellites, I have been attempting to discipline the oscillator for

Re: [time-nuts] WWVB NIST Radio Time Receiver

2010-10-20 Thread mike cook
horses for courses. All the commercial atomic clocks clocks I have seen only do time corrections every hour to save on the battery consumption. With one of these receivers ( there is even a link to a homebrew clock project on the referenced page comments tab) you get continuous time code

Re: [time-nuts] NTP Clock suggestions?

2013-05-27 Thread mike cook
Le 27 mai 2013 à 16:56, Miguel Barbosa Gonçalves a écrit : I don't understand why a microprocessor with an Ethernet controller and a 7 segment display would cost so much to manufacture... I think I'll build my own. One advantage of having an OS and NTP client on board is that you get

Re: [time-nuts] NTP Clock suggestions?

2013-05-28 Thread mike cook
Yup, Got a similar response from the local distribs here in France. They did propose a similar product at 600euros VAT (19,6%). Le 28 mai 2013 à 12:10, Mark C. Stephens a écrit : I was sucked in and got this reply: _ _ _ _ _ _ _ Dear Mark, Thank you for your interest on

Re: [time-nuts] FE-5860A - R232 working but S type commands don'twork.

2013-06-22 Thread mike cook
Nothing from Win7+latest Bitdefender update. Le 22 juin 2013 à 16:12, Tom Miller a écrit : MSE reports the two .exe files as unsafe and contains a virus. Does anyone else see the same thing? Regards - Original Message - From: Mark C. Stephens ma...@non-stop.com.au To:

Re: [time-nuts] Oncore UT+ Battery Backup

2013-06-26 Thread mike cook
Le 27 juin 2013 à 07:04, Mark C. Stephens a écrit : I do believe the UT+ will try to charge the battery while on, so some sort of rechargeable lithium cell is in order. Yes, you need to connect our battery via Pin1if not using a rechargeable on board. -Original Message-

Re: [time-nuts] BBC Precision: Measure of All Things

2013-06-27 Thread mike cook
For info, the BBC provide an app for iPhone and iPad to read these videos outside UK. Nothing for Android though :( . Le 27 juin 2013 à 12:19, David Kirkby a écrit : On 27 June 2013 06:08, Doug Calvert dfc-l...@douglasfcalvert.net wrote: On Wed, Jun 26, 2013 at 10:07 PM, Dan Rae

Re: [time-nuts] Regulator Choices

2013-06-28 Thread mike cook
Le 29 juin 2013 à 06:12, Perry Sandeen a écrit : Wrote: Consider using a LT1083 7.5 Amp regulator. Well it is $14 each. The LM 1084 5 Amp 1s $2.43 each Hefty premium for an extra 2.5 Amps. If one needs greater than 5 amps, the LM 1084 data sheet shows how to easily parallel

Re: [time-nuts] looking for low-power system for gps ntp timekeeping

2013-07-02 Thread mike cook
Le 2 juil. 2013 à 02:52, Bob Camp a écrit : Hi snip The reference I was making was to a pie in the sky 1.8 GHz clocked timer integrated into a CPU chip. That would let you come up with ~ 600 ps timing directly. Since it would be both unusual and very fast, a driver (potentially

Re: [time-nuts] How dangerous if Rb lamp broken?

2013-07-09 Thread mike cook
Le 9 juil. 2013 à 13:49, Robert Atkinson a écrit : Hi Why are so many people radiophobic? As in ionising radiation. There are far more hazardous things in our hobby, electrocution and falling from a height be two of the big killers. I defy anyone to come up with a confirmed case of death

Re: [time-nuts] UT+ Software for Linux?

2013-07-14 Thread mike cook
I have lost the thread here but if not already mentioned, there is the driver for Oncore receivers in ntp already, or if you are happy with the win apps you could run them in Linux under Wine or VirtualBox. Le 14 juil. 2013 à 02:05, Bob Stewart a écrit : could run them in a linux box OK,

Re: [time-nuts] Lecia L1 GPS chokering antenna voltage,

2013-07-15 Thread mike cook
Check the antenna data on the Leica site http://www.leica-geosystems.com/en/page_catalog.htm?cid=2056. Maybe yours is there. Part Nos don't usually have an easy mapping to product model IDs :-( . If not , I did notice on the ones that I looked at that the supply voltages were all 3,3V-12V.

Re: [time-nuts] NTP to discipline Raspberry Pi

2013-07-26 Thread mike cook
Le 25 juil. 2013 à 05:21, James Peroulas a écrit : I was hoping to measure the ppm error of a Raspberry Pi's crystal using an NTP client running on the Pi itself. The NTP client reports a ppm correction that I find to be consistently (measurements performed over several days) off by about 10

Re: [time-nuts] NTP to discipline Raspberry Pi

2013-07-26 Thread mike cook
Le 26 juil. 2013 à 01:54, Julien Ridoux a écrit : Hi James, We have done some measurements of the stability of the STC clocksource that the kernel relies on to build its system clock. I believe this link could be the answer to your question:

Re: [time-nuts] NTP to discipline Raspberry Pi

2013-07-27 Thread mike cook
Le 27 juil. 2013 à 03:18, Julien Ridoux a écrit : snip Hi Mike, Thanks for the interest in the data. You are quite right for everything regarding data structure, but let me explain what we meant by that comment. Timespec{} is a 64 bit data structure and support nanoseconds. Yes.

Re: [time-nuts] NTP to discipline Raspberry Pi

2013-07-27 Thread mike cook
Thanks for that James. Le 27 juil. 2013 à 04:26, James Peroulas a écrit : Date: Fri, 26 Jul 2013 12:27:50 +0200 From: mike cook mc235...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] NTP to discipline Raspberry Pi

[time-nuts] possible issue with LEA 6T eval board

2014-01-17 Thread mike cook
Just a heads up on an issue I had with a LEA-6T timing receiver advertised on ebay in case any of you have one, or are thinking of investing. The model I got is the one advertised in ebay item 261294820006. It functioned OK for three months and then on powering up one day it seemed to be dead.

Re: [time-nuts] Morion MV89A position

2014-01-24 Thread mike cook
Le 24 janv. 2014 à 05:26, Paul Cianciolo a écrit : Hello all, I have had a MV89A running now for a couple of years now. It is inside of a Dewar along with bypassing capacitors and the adjustment pot. The end is sealed insulation. For a matter of convenience the oscillator is mounted

[time-nuts] What is your SRS PRS10 Rubidium 1PPS OUT rise time?

2014-01-27 Thread mike cook
Hi, I have just brought my PRS10 out of mothballs and am trying to get a good lock to my TBolt 1PPS. The 1PPS OUT signal from my PRS10 has a very slow rise time, in the order of 70ns. I would be grateful, if anyone here has one on their bench, to let me know what theirs is. I can't find

[time-nuts] test after email address change and repost of PRS10 question.

2014-01-28 Thread mike cook
My recent attempts at posting have been all been blocked for some reason so I am switching email address in the hope that that corrects it. Here is my last one, hoping that it is not a repeat for you guys. Hi, I have just brought my PRS10 out of mothballs and am trying to get a good lock to

Re: [time-nuts] test after email address change and repost of PRS10 question.

2014-01-28 Thread mike cook
Jarl Risum gave me some info which could explain that. His PRS10 1PPS rise time , taken at the unit DB connector pin, was about 50ns, which is in the same ballpark as mine, but he noted that if the Breaklout Board is installed , the signal passes through a two Schmitt inverters (74HC14s).

Re: [time-nuts] The pendulum problem...

2014-01-31 Thread mike cook
Le 31 janv. 2014 à 06:06, Brian, WA1ZMS a écrit : snip Modern pendulum clocks have a modified gear drive where the escapement is still being driven while the main wheel is being advanced to wind the weight cable. Not the case for 200+ year old clocks. It is not so much the case

[time-nuts] housing multiple GPS timing receivers in the same box.

2014-02-04 Thread mike cook
Hi, Till now I have been putting receivers in individual boxes. So to limit the growing number of boxes, I want to put two Resolution-T SMT receivers in one box, sharing power and antenna inputs. My question is How best can I share the antenna input, minimizing any interference between the

Re: [time-nuts] housing multiple GPS timing receivers in the same box.

2014-02-04 Thread mike cook
to be less. A Mini Circuits splitter will just about do it , but I would prefer a smaller solution. Am 04.02.2014 14:08, schrieb mike cook: Hi, Till now I have been putting receivers in individual boxes. So to limit the growing number of boxes, I want to put two Resolution-T SMT receivers in one

Re: [time-nuts] clock and cannon at noon story

2014-02-04 Thread mike cook
Le 5 févr. 2014 à 01:22, Michael Blazer a écrit : Wouldn't the watchmaker notice that his clock is always a few seconds fast? If the cannon is a mile away, the watchmaker would be adjusting the clock so that 'noon' would sound around tea time after about 10 years. Gibraltar is very

Re: [time-nuts] housing multiple GPS timing receivers in the same box.

2014-02-05 Thread mike cook
Le 5 févr. 2014 à 01:52, saidj...@aol.com a écrit : Michael, use a simple BNC T-splitter. Works perfectly for me as long as both GPS carry the same antenna voltage. No loss in signal quality evident from the C/No readings, and dirt-cheap. No need to over-complicate this. bye, Said

Re: [time-nuts] BC637PCI and OCXO

2014-02-07 Thread mike cook
Le 7 févr. 2014 à 00:18, d0ct0r a écrit : Hello, Does anybody seen any links to the information how to implement external OCXO to Symmetricom PCI TFP BC635/BC637 ? check the Symmetricom datasheets. You don't mention the version you are needing info for , IRIG/GPS.. Anyway, all

Re: [time-nuts] Maxim DS3232 and I2C

2014-02-15 Thread mike cook
I don't think this is an issue. The datasheet indicates : When reading or writing the time and date registers, secondary (user) buffers are used to prevent errors when the internal registers update. When reading the time and date registers, the user buffers are synchronized to the internal

[time-nuts] strange behavior of 53230A or is the light on, but nobody in?

2014-02-17 Thread mike cook
Something that must be simple to explain, but that I can't get my head round. I got a new 53230A. When first using it, I measured my T-Bolt 10MHz using the internal 10MHz timebase and it came up short of 10MHz, 9.999 998 5xx. I wasn't worried about it as the counter only has a TCXO internal

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

2014-02-17 Thread mike cook
Le 17 févr. 2014 à 13:49, gandal...@aol.com a écrit : Hi Michael Internal reference out is likely to be of the actual reference in use, ie with an external reference connected that's what will be on the output connector and would explain what you're seeing. Your initial test, using

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

2014-02-19 Thread mike cook
cover how those connections work. Otherwise, perhaps someone that owns one could provide further insight. BillWB6BNQ mike cook wrote: Something that must be simple to explain, but that I can't get my head round. I got a new 53230A. When first using it, I measured my T-Bolt 10MHz

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

2014-02-19 Thread mike cook
capitalists? Come on, thats backseat driving. Be happy they invested millions of their own money and put out a more or less affordable new counter in a market flooded with good low-cost used counters. Bye, Said Sent From iPhone On Feb 19, 2014, at 0:33, mike cook michael.c...@sfr.fr

Re: [time-nuts] Sidereal seconds

2012-03-02 Thread mike cook
Le 02/03/2012 05:13, Neville Michie a écrit : A possible solution is to take mean time (from a TBolt 10MHz) and divide it by 9,972,695.7 to give a PPS(sid) signal that can run a digital clock dial and give one second(sid) ticks to phase the pendulum. It may be simpler to divide by 9,972,696

Re: [time-nuts] Possible replacement for FE5680A

2012-03-09 Thread mike cook
Le 09/03/2012 08:29, Roger Costello a écrit : I noticed this which could potentially be a very good thing. https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe Interesting. Thanks for the ref. I am afraid it will be a while before the price drops to $40 shipping

Re: [time-nuts] question about Thunderbolt geo acuracy

2012-05-10 Thread mike cook
A man with only one GPS Surveys from different receivers I have. All taken at the same height from prolonged surveys. WGS84 datum. Oncore UT+ A 207,62m Oncore UT+ B 209,24m Z3801A 180,72m Oncore VP A 229,95m TBolt 207.00m Le 10/05/2012

Re: [time-nuts] question about Thunderbolt geo acuracy

2012-05-10 Thread mike cook
Le 10/05/2012 15:51, Jim Lux a écrit : On 5/10/12 6:42 AM, mike cook wrote: A man with only one GPS Surveys from different receivers I have. All taken at the same height from prolonged surveys. WGS84 datum. Oncore UT+ A 207,62m Oncore UT+ B 209,24m Z3801A 180,72m Oncore VP A 229,95m

Re: [time-nuts] question about Thunderbolt geo accuracy

2012-05-10 Thread mike cook
Le 10/05/2012 21:50, Jim Lux a écrit : On 5/10/12 9:18 AM, Chris Albertson wrote: On Thu, May 10, 2012 at 9:07 AM, Bob Campli...@rtty.us wrote: . Hi all, Hope this isn't too chat roomy, however, I have need of a survey precise geolocation type gps. I was wondering if the precise timing

Re: [time-nuts] Why 9,192,631,770 ??

2012-05-11 Thread mike cook
Le 11/05/2012 07:14, Peter Monta a écrit : Are there better estimates of the ET second nowadays (relative to the SI second)? It would be interesting to know what the cesium frequency should have been if much better estimates of the ephemeris-time second were available at the time. One would

Re: [time-nuts] TU-60 Instruction to set NMEA output

2012-05-11 Thread mike cook
Hi Merv, I found the Navman Jupiter designers guide which has the message formats. What you need is message 1331. Tac32 supports this receiver, so there should be a possibility at setup to specify NMEA protocol. Else stuff it a 1331 . The guide is at

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-14 Thread mike cook
Le 14/05/2012 17:23, Mark Sims a écrit : My first inclination, if I were building a timing receiver, would be to make the PPS output a nice, symmetrical square wave. But pretty much all GPS timing receivers output an anorexic, dinky little heroin addicted supermodel sized pulse (from 1

Re: [time-nuts] Software for Navman jupiter T Tu60 GPS 1pps 10khz GPS Module

2012-05-18 Thread mike cook
Le 18/05/2012 20:14, Ken Kubick a écrit : Hi, Time-Nuts guys anyone know where I can get software for a Navman jupiter T Tu60 GPS Kit 1pps 10khz GPS Module. What you need depends on the protocol it powers up in. If it is Motorola, you can talk to it with TAC32 If in Zodiac binary, then

Re: [time-nuts] Software for Navman jupiter T Tu60 GPS 1pps 10khz GPS Module

2012-05-18 Thread mike cook
Agreed. I made the distinction as someone in a previous thread was indicating that they got a rockwell binary response on power on. Le 19/05/2012 01:42, k4...@aol.com a écrit : Mike, The standard Jupiter-T should never power up in Rockwell binary. You have to command it to go to binary with

Re: [time-nuts] Lady Heather command line?

2012-06-02 Thread mike cook
Le 02/06/2012 09:22, ken johnson a écrit : Hi, can someone please tell me how to get the satellite graphic plot up on lady heather by using command line switches at program start? If I enter s then 3 when the program is running I get some displays up, but when I try to add the commands to the

Re: [time-nuts] ANN: UK MSF 60 kHz interruption, 2012 June 14

2012-06-04 Thread mike cook
Le 4 juin 2012 à 05:43, David I. Emery a écrit : On Sun, Jun 03, 2012 at 09:20:59AM -0700, J. Forster wrote: Is there any indication the carriers of WWVB and MSF are locked together? -John = Given it's only 60 KHz and certainly somewhere north of parts in 10^13

Re: [time-nuts] GPS NTP update on Mac OS-X 10.7.4

2012-06-12 Thread mike cook
Le 12 juin 2012 à 16:37, Ross T61AA a écrit : Hi all, I recently connected up a USB GPS to my Linux box and found it quite easy to get NTP to up from the GPS. I was hoping to get the same GPS to update the Mac running Lion 10.7.4, however, it has been a very frustrating uphill battle.

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 20/06/2012 10:22, John Miles a écrit : Another long-awaited announcement: http://www.ke5fx.com/heather/readme.htm Highlights of V3.10: - No longer a beta! - Added support for Nortel NTGS50A-series receivers - Added support for Resolution-T and Resolution SMT receivers Thanks

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 21/06/2012 00:13, mike cook a écrit : Le 20/06/2012 10:22, John Miles a écrit : Another long-awaited announcement: http://www.ke5fx.com/heather/readme.htm Highlights of V3.10: - No longer a beta! - Added support for Nortel NTGS50A-series receivers - Added support for Resolution-T

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 21/06/2012 00:18, mike cook a écrit : 39.517°N, 76.794°W Recognise it? Flashy place near Baltimor. Oops I just looked at the installed properties and see they point to a LH server. Aargh! All OK now. ___ time-nuts

Re: [time-nuts] NTPns syslog configuration

2012-06-27 Thread mike cook
Le 28/06/2012 00:28, Stijn Nestra a écrit : Hello, I have build a NTP server using the Soekris and M12 concept and I am using a freebsd image that Jason has made. The problem is that I am a total fbsd noob and that I want the oncore_msg logged on a syslog server. I have tried several things

Re: [time-nuts] So, how did you spend your leapsecond?

2012-07-01 Thread mike cook
Quote from an unidentified admin: Posted: Yesterday 10:35:14 PM im rebooting a couple hundred linux servers right now, it caught us by surprise and boofed our production environment tonight. i walk in from a road trip across texas (carbine class) and in my door my phone starts ringing. well

Re: [time-nuts] Trimble Mini-T end of life

2012-07-19 Thread mike cook
Le 19/07/2012 09:15, saidj...@aol.com a écrit : Mini-T is end of life How about onboard DDS with sine/square choice( and own SMA out if space avalable)? Also programmable PPS offsets if not already available. -- Les chiens aboient, et la caravane passe.

Re: [time-nuts] GLONASS receiver

2012-08-05 Thread mike cook
Le 06/08/2012 00:01, Bob Camp a écrit : Hi The part at the link does not appear to have a holdover specification. You probably would do better with a TBolt off of eBay. Agreed. I took a look at the Axtal AXIOM40 data sheet and they are quoting 200 ppb per YEAR aging.. That's not bad; so if

Re: [time-nuts] web presentation of data

2012-08-07 Thread mike cook
Le 07/08/2012 17:56, Chris Albertson a écrit : On Tue, Aug 7, 2012 at 6:45 AM, Jim Lux jim...@earthlink.net wrote: On 8/6/12 10:43 AM, Chris Albertson wrote: On Mon, Aug 6, 2012 at 8:34 AM, Jim Lux jim...@earthlink.net wrote: what would be useful is to have some sort of plotting engine

Re: [time-nuts] What size graphs do people like? (How big is yourscreen?)

2012-08-08 Thread mike cook
Le 08/08/2012 11:00, Rex a écrit : Hal, I If you go to: http://validator.w3.org and enter your link into the address field (http://www.megapathdsl.net/~hmurray/time-nuts/coax/Front-5ns-800x600.svg) then click Check, you will get a message that sort of explains the situation, except I still

Re: [time-nuts] oscillators

2012-08-29 Thread mike cook
nippedLe 30/08/2012 06:12, Neville Michie a écrit : Does anyone know about what technology is used in Swiss watches to get much better performance from their xtals than you might expect? I assumed that they had look up lists to insert extra counts to compensate for ambient variations, but I

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