Check out the NTP clock kit from Tuxgraphics. http://tuxgraphics.org/electronics/200710/avr-ntp-clock.shtml
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 29, 2009 8:00 AM To: [email protected] Subject: time-nuts Digest, Vol 63, Issue 106 Send time-nuts mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: G P S D O (Ray Hudson) 2. Re: Clock Project Help (Brent Gordon) 3. Re: G P S D O (Javier Herrero) 4. Solartron 7150+ filters (David C. Partridge) ---------------------------------------------------------------------- Message: 1 Date: Wed, 28 Oct 2009 21:10:19 -0700 (PDT) From: Ray Hudson <[email protected]> Subject: Re: [time-nuts] G P S D O To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=iso-8859-1 Brian use PDF999 http://www.pdf995.com/ its a printer driver that prints to PDF file. When installing it just untick all the other junk it wants to install. You get a few of ads when using it but its free otherwise. Ray. --- On Thu, 29/10/09, Brian Kirby <[email protected]> wrote: > From: Brian Kirby <[email protected]> > Subject: [time-nuts] G P S D O > To: "precise time" <[email protected]> > Received: Thursday, 29 October, 2009, 2:32 PM > I have attached a plots of various > GPSDO's compared against a HP5065A rubidium. > > The first plot is of a HP Z3801A.? The left scale > spans 36 nanoseconds. > > The second plot is of a Trimble Thunderbolt, its running > default 100 second time constant with a 1.2 damping > factor.? Its from the group purchase.? I changed > the scale to span 36 nanoseconds. > > The third plot is of Efratom FRS-C rubidium that is > controlled by the Shera Controller, and its GPS source is an > older Motorola Oncore VP, ver 10.? The scale > spans???36 nanoseconds.? Bear in mind > this was not his stock PIC, but a PIC that we modified for a > rubidium.? His stock PIC had a update rate of 30 > seconds, we tested units at 60, 120 and 240 seconds and > settled on 120 seconds after the preliminary > data.???The time constant was set up for mode > 7, I believe that works out to? the proportional > controller time constant around 1/3 of a day? (I'll > have to find the paperwork and run the calcs). > > I tried to present some information earlier, but the only > instrumentation I had was a HP 53131A, with TAC32, and a > Efratom FRK-L for reference.? At that time I did not > have the computing horsepower, plotting capability or some > more serious instrumentation. > > The instrumentation used in these plots was a HP 5370B, it > baselines at 2x10-11 at one second and drops a magnitude for > every decade in tau.? The recording was done via a > Prologix GPIB USB adapter and HyperTerminal in > Windows.? The plots were generate in DF6JB/Ulrich's > Plotter program (thanks !). > > After generating the plots, I scanned them into PDF at 200 > DPI to save bandwidth.? I have not been able to > generate PDF's directly inside of Plotter.? I use > version 6 of PDF and it takes an internal error.? AT > the present, I cannot afford to upgrade it. > > I bought a Fury controller a couple of years back and due > to personal issues I could not put it to use.? My next > project it to put the Fury on the FRS-C and see how much we > can smooth it out.... > > Brian KD4FM > > -----Inline Attachment Follows----- > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. __________________________________________________________________________________ Get more done like never before with Yahoo!7 Mail. Learn more: http://au.overview.mail.yahoo.com/ ------------------------------ Message: 2 Date: Wed, 28 Oct 2009 22:27:55 -0600 From: Brent Gordon <[email protected]> Subject: Re: [time-nuts] Clock Project Help To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="ISO-8859-1" There is an article in Circuit Cellar magazine that you need to read. It is Time Server Design: Synchronize with the WWVB Time Code. It is in the Nov 2008 issue (#220). You can buy the article at [1]http://www.circuitcellar.com/magazine/220.html for $1.50. Although it is the opposite of what you want to do (it acts as an NTP server), the article has lots of useful information. I vaguely recall that they also had an article very close to what you want, possibly in 2007. If I remember correctly it was a combination alarm clock/MP3 player that got the time using NTP. If it wasn't in Circuit Cellar then it was in Nuts & Volts magazine [2]http://www.nutsvolts.com/ . Nuts and Volts is more beginner oriented than Circuit Cellar. If you want a microcontroller with an OLED display look at Luminary Micro Stellaris LM3S811 Evaluation Kit [3]http://www.luminarymicro.com/products/stellaris_811_evaluation_kits. html . You can get them from Digi-Key for $49. It doesn't have ethernet but it does have USB. Add one of the internet-on-a-chip boards from Microchip or Wiznet and you're done. I just found out Circuit Cellar is sponsoring a contest with $15000 total prize money for cool designs using the Wiznet W7100. You can get an eval board with LCD display for $49. I think it would be ideal for your project. [4]http://www.circuitcellar.com/newsletter/1009.htm I'm not affiliated with Circuit Cellar in any way other than as a subscriber. Most of what I know about embedded systems I learned from reading the magazine. They even have Time Nuts related articles: Microcontroller Clock-Locking: Frequency Reference Synchronization in the Jan 2009 (#222). Brent References 1. http://www.circuitcellar.com/magazine/220.html 2. http://www.nutsvolts.com/ 3. http://www.luminarymicro.com/products/stellaris_811_evaluation_kits.html 4. http://www.circuitcellar.com/newsletter/1009.htm ------------------------------ Message: 3 Date: Thu, 29 Oct 2009 08:06:20 +0100 From: Javier Herrero <[email protected]> Subject: Re: [time-nuts] G P S D O To: Discussion of precise time and frequency measurement <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed I prefer PDFcreator http://sourceforge.net/projects/pdfcreator/ Free without ads, and as far as I remember, better than PDF995 :) Regards, Javier Ray Hudson escribi?: > Brian use PDF999 http://www.pdf995.com/ its a printer driver that prints > to PDF file. When installing it just untick all the other junk it wants to > install. You get a few of ads when using it but its free otherwise. > > Ray. > -- ------------------------------------------------------------------------ Javier Herrero EMAIL: [email protected] HV Sistemas S.L. PHONE: +34 949 336 806 Los Charcones, 17A FAX: +34 949 336 792 19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com ------------------------------ Message: 4 Date: Thu, 29 Oct 2009 10:47:46 -0000 From: "David C. Partridge" <[email protected]> Subject: [time-nuts] Solartron 7150+ filters To: "'Discussion of precise time and frequency measurement'" <[email protected]> Message-ID: <54b8bb1f521540fd9967c72a7efc5...@apollo> Content-Type: text/plain; charset="us-ascii" Ian, If you have time/inclination, I'd be interested to see pics of your dissassembly/reassembly process. Dave -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of gonzo moto Sent: 28 October 2009 18:11 To: time-nuts Subject: Re: [time-nuts] time-nuts Digest, Vol 63, Issue 101 I hear you David! I thought I'd start on the working filter and the repair the smoked unit when I know what I'm doing. I've burrowed inside the filter and was surprised to find the filter caps (WIMA MP3-E) are only rated for 250V. The MP3-E is a discontinued line (read: I can't find a datasheet). These might be ok for European 220V, but my UPS shows my line voltage to average 243V, with regular excursions over 250V. These caps may be good, but I'd like to see a bit more margin there (it'll be going back together with MP3-X2/275V caps). Robert, while it's not that I don't value my time, my workmanship is up to the task, and I'm reluctant to replace a component (possibly with one no better than the failed part) when I can fix it better than it was in the first place. ian _________________________________________________________________ Take a peek at other people's pay and perks Check out The Great Australian Pay Check http://clk.atdmt.com/NMN/go/157639755/direct/01/ _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ------------------------------ _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 63, Issue 106 ****************************************** _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
