Re: [time-nuts] Low cost GPS module for 100ns timestamping error
On Fri, May 9, 2014 at 10:46 AM, Tony tn...@toneh.demon.co.uk wrote: But isn't that only supported by 'timing' GPS modules that allow you to specify the location? But they are rather more expensive than the common navigation type modules - are there sub $15 modules that support that single-satellite timing feature? With a $15 budget. I think you are limited to the old Motorola Oncore type. The UT+ sells for about $15 on eBay. There are two versions of the UT. Get the timing one. These aren't to bad. The PPS one sigma error is about 50ns and the UT runs on 5 volts. The newer MT+ version is better but at least $30. Does it make sense to place thermal insolation on a TCXO? It does on an OCXO because there is a thermostat inside the device and the thermal insulation will help the OCXO maintain a constant temperature. But a TCXO will just run hotter. I think all you need is a box to keep drafts and direct sunlight off the TCXO. -- Chris Albertson Redondo Beach, California ___ 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] Binaries for the Agilent 53132A
Hi, I have a 53132A frequency counter with bad program memory. Does anyone have binaries for the 53132A? Regards, jgorsk. ___ 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] BeagleBone Black NTP server
On Fri, 9 May 2014 23:49:05 -0400 Paul tic-...@bodosom.net wrote: On Fri, May 9, 2014 at 11:38 PM, nuts n...@lazygranch.com wrote: I can tell you that the BBB is really reliable. You don't hear that about the R. Pi, I find them comparable. My Pi has actually run longer. I don't expect either to be able to run a year without crashing. Note a bug on the BBB is if you use a cape, it blocks the connector to the serial port. I use stacking headers (the wrong way) to lift the cape. I'd rather have the console port than be able to close a case. ___ I think I can visualize what you did. Kind of like how many daughter boards connect to motherboards. I was thinking it might make more sense to move the serial port pins to the bottom, or just make a flexible cable to hook up to the serial port. You have to wonder who made this executive decision to have the cape cover rather important pins. Now in defense of the BBB versus the older Beagle Boards, the ethernet port is native, so to speak, rather than going through a usb port then converted to ethernet. There were real problems with that scheme, most notably the usb hub crashing and bringing down all communications. So you can do a trustworthy SSH into the ethernet port. I have a Beagleboard XM gathering dust due to issues with the usb hub. It didn't turn out to be the most stable arm SBC. However the BBB is very solid except for that odd router issue I mentioned. http://www.inplanesight.org/adsb_bbb_angstrom.html This page has instructions for using the BBB for mode-s decoding, but there are a few useful tips on it. For instance, you will want to change the runlevel if you want to SSH into the device rather than use the HDMI port. ___ 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] BeagleBone Black NTP server
On 10/05/14 03:32, Brian Lloyd wrote: That may be the case for the Angstrom distro but it is not the case for the Debian distro, which seems to be the future direction of BBB. It's an aptitude install away, although you may want to build from source to ensure all ref clocks are enabled (esp the ATOM PPS driver, may not be enabled in the default build. ___ 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] BeagleBone Black NTP server
On 10/05/14 04:49, Paul wrote: I use stacking headers (the wrong way) to lift the cape. I'd rather have the console port than be able to close a case. Add a getty on one of the other serial ports :) Or manage via ssh over the LAN :) [Yes, okay, you don't get access to early boot, but to be honest you shouldn't be needing that very often] Best Regards Iain ___ 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] BeagleBone Black NTP server
On 10/05/14 04:38, nuts wrote: Note a bug on the BBB is if you use a cape, it blocks the connector to the serial port. The serial port ? I assume you mean the UART0, aka the console ? There are 5 others to choose from (UART3 doesn't have all the pins brought out from the but makes a great PPS or MSF/DCF input) Those 5 are brought out to P8 and/or P9. You may have to twiddle some pinmux, and lose access to the HDMI and onboard MMC, depending on which port you choose, but you can stilll use the SD card slot. Why would you want HDMI on an NTP server anyway ? These days, you just load the appropriate Cape firmware (Yes, even if you don't actually haver a serial cape, the firmware essentially twiddles those pinmux's for you. Now, the BBB has a better PPS input. The TIMER4-TIMER7 inputs can be used, *IF* you are willing to run FreeBSD rather than Linux. See: http://lists.freebsd.org/pipermail/freebsd-arm/2013-February/004769.html (Note, no need for patches now, just grab the snapshots from ftp.freebsd.org. the patch is in there) I _think_ it's also in the latest releases, I'd need to check to be sure though. I know there was some work done on a similiar facitility for Linux, but not sure if the Author has had the time to finish the work. I have my BBBs fed from my Austrons via a 5V-3.3V voltage divider. One thing I'd like to try is feeding the BBB the 10MHz clock from the Austrons, as it also has an External Clock Input Pin (TCLKIN), but that will need some kernel work to select the external clock. It may also need further work in uboot. Treat the BBB and Pi just like any other Linux box :) Iain ___ 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] The Problem with Time Timezones - Computerphile
On 9 May 2014 21:01, Hal Murray hmur...@megapathdsl.net wrote: hol...@hotmail.com said: Ahh, but with Lady Heather you can specify the time zone offset (down to the second) and the when the daylight savings time switchovers occur. And from experience, I can tell you that the code to do it is a royal pain in the ass... not all that hard to do, but a pain to test. Part of the problem is that when the daylight savings time switchovers occur changes over time. The problem is a whole lot easier if all you are interested in is converting the current UTC to the current local time. The *nix world uses the time-zone database. I assume it is available on Windows too. https://en.wikipedia.org/wiki/Tz_database That is the Olson Timezone Database, aka tzdata. I wrote a compiler for it once, the format is very fun to parse and there are some great things to be learned. Specifically figuring all edge cases was a fun exercise. ___ 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] PRS10 rubidium on eBay
Corby, It would be nice to have included the eBay item number. BillWB6BNQ cdel...@juno.com wrote: Hi, I'm selling a nice PRS10 on eBay if anyone is interested. With manual and schematics. Works great! Cheers, Corby Dawson ___ 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 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] BeagleBone Black NTP server
n...@lazygranch.com said: You have to wonder who made this executive decision to have the cape cover rather important pins. How often do you need the serial port after you get SSH working? -- These are my opinions. I hate spam. ___ 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] PRS10 rubidium on eBay
Hi Bill, eBay has a search bar. If you type PRS10 Rubidium it will locate Corby's item and possibly other similar items. You can follow this search too, and eBay will send you emails once a day with any hits. I have close to a hundred saved search terms on file. See www.leapsecond.com/time-nuts.htm for a list of TF company names to search for. In addition, you can follow this seller in which case you get notified by email when the seller has new items. Yes, corbymite is one that I follow. To answer your question, the item is http://www.ebay.com/itm/321402060170 /tvb - Original Message - From: wb6bnq wb6...@cox.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, May 09, 2014 11:50 PM Subject: Re: [time-nuts] PRS10 rubidium on eBay Corby, It would be nice to have included the eBay item number. BillWB6BNQ cdel...@juno.com wrote: Hi, I'm selling a nice PRS10 on eBay if anyone is interested. With manual and schematics. Works great! Cheers, Corby Dawson ___ 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] BeagleBone Black NTP server
From: nuts I'm running dump1090 on the BBB, for those familiar with the project. [Probably just satellite Dave.] === FYI, there are also versions of the excellent dump1090 program available for the Raspberry Pi and very recent,y, for Windows: http://www.satsignal.eu/raspberry-pi/dump1090.html http://planeplotter.pbworks.com/Dump1090 It has some useful timing enhancements over RTL1090, and both versions feed Plane Plotter for multi-lateration activities (interesting maths there!). David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] PRS10 rubidium on eBay
On 10 May 2014 11:01, Tom Van Baak t...@leapsecond.com wrote: Hi Bill, eBay has a search bar. If you type PRS10 Rubidium it will locate Corby's item and possibly other similar items. I rarely use eBay's search tool now, since I found http://www.geo-ship.com/ as it is much better at searching eBay than what eBay is! That allows you to search multiple eBay sites, irrespective of whether * The seller has paid to make the listing available on multiple sites * Tell seller posts to your location. Since even if you pick worldwide on eBay, it does not search all sites, and it only searches a site if the seller has paid to have his/her listing on the site. http://www.geo-ship.com/?c_keywords=11644a%20%28hp,agilent%29c_keywordsTranslated=11644a%20%28hp,agilent%29c_priceRange_min=-1c_priceRange_max=-1c_sellerName=c_category=See-All-Categoriesc_priceOrgCurrencyRange_min=-1c_priceOrgCurrencyRange_max=-1a_selectedLocales=EBAY-US,EBAY-GB,EBAY-AU,EBAY-DE,EBAY-FR,EBAY-IT,EBAY-AT,EBAY-ES,EBAY-ENCA,EBAY-IE,EBAY-NL,EBAY-CH,EBAY-PL,EBAY-SGa_searchDesc=falsea_searchPaypalOnly=falsea_bestOfferOnly=falsea_searchCompleted=falsea_searchSoldOnly=falsea_onlyWithShipping=falsea_setPricerangeTotal=falsea_bidsRange_min=-1a_bidsRange_max=-1a_feedbackRange_min=-1a_feedbackRange_max=-1a_positiveFeedbackRange_min=-1a_positiveFeedbackRange_max=-1a_buyingFormat=Alla_itemCondition=Alla_availableTo=WORLDWIDEa_locatedIn=ANYa_resultsPerPage=100a_ebaySortOrder=StartTimeNewest Also Google is a good search tool for eBay. Dave ___ 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] Low cost GPS module for 100ns timestamping error
On Fri, 09 May 2014 18:46:05 +0100 Tony tn...@toneh.demon.co.uk wrote: Quite a remarkable datasheet for a low cost part - I've not found any other low cost oscillator with either of those specifications, and even some (most?) of the OXCO don't specify the freq/temp slope. I'm quite sure the manufacturers have this data, but they do not readily publish it because it is not tested for and thus not guaranteed. Ie the manufacturers want to prevent someone from taking that data, constructing some specs in their mind and blaming the manufacturer when the circuit fails because the part didn't meet the specs. Usually the manufacturers are quite happy to share that data if you ask nicely. Attila Kinali -- I pity people who can't find laughter or at least some bit of amusement in the little doings of the day. I believe I could find something ridiculous even in the saddest moment, if necessary. It has nothing to do with being superficial. It's a matter of joy in life. -- Sophie Scholl ___ 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] BeagleBone Black NTP server
On Sat, May 10, 2014 at 4:00 AM, Iain Young i...@g7iii.net wrote: you may want to build from source to ensure all ref clocks are enabled Yes, you have to buid NTPD if you want PPS. This effects ATOM, NMEA and a couple other refclocks. It can also be unpleasant beause you have to track down timepps.h. I've opened a bug at ntp.org about timepps.h but I don't expect it to be fixed. Likewise the Thunderbolt patch I sent them (to make note something that might be of interest to time-nuts). ___ 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] BeagleBone Black NTP server
On Sat, May 10, 2014 at 4:02 AM, Iain Young i...@g7iii.net wrote: Yes, okay, you don't get access to early boot The system has a serial console and I want access to it without fiddling the firmware. Since I'm still in the prototype phase just elevating the cape is sufficient. The next step would be replacing the header. ___ 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] PRS10 rubidium on eBay
Corby, a friend of mine has a rubidium standard he wants to sell. I can't remember exactly what it is, but I think it's an Austron 504(?) (704?). I sold you one many years ago(like 20 or so). They came from one of the ATT microwave sites. His number is 308-532-3291 and he lives in North Platte, NE. He's 91 years old, pretty sharp but nearly blind from macular degeneration and he's pretty hard of hearing so he's a bit difficult to talk with. He is on Skype and it works better than the landline fone. If you want to try Skype look for William O Wesslund. John -- Original Message -- From: cdel...@juno.com To: time-nuts@febo.com Subject: [time-nuts] PRS10 rubidium on eBay Date: Fri, 9 May 2014 21:22:34 -0700 Hi, I'm selling a nice PRS10 on eBay if anyone is interested. With manual and schematics. Works great! Cheers, Corby Dawson ___ 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. The #1 Worst Carb Ever? Click to Learn #1 Carb that Kills Your Blood Sugar #40;Don#39;t Eat This!#41; http://thirdpartyoffers.juno.com/TGL3131/536e7f29de4da7f2961d0st02duc ___ 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] PRS10 rubidium on eBay
John, I believe that the unit referred to is a Tracor 308A. I no longer look to play with the Tracor units (304 308 600 900) as their performance does not merit putting a lot of work into them. Thanks for the heads up however! The eBay # for the PRS10 is 321402060170 Corby ___ 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] BeagleBone Black NTP server
On Sat, 10 May 2014 02:39:25 -0700 Hal Murray hmur...@megapathdsl.net wrote: n...@lazygranch.com said: You have to wonder who made this executive decision to have the cape cover rather important pins. How often do you need the serial port after you get SSH working? The serial port is handy when things don't work. Diagnostics are dumped to it. If all goes well, you don't need it at all. ___ 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.
