[time-nuts] OT: Galileo starts to tell UTC, the world’s time
Galileo starts to tell UTC, the world’s time Europe’s four Galileo satellites are now working as clocks accurate to a few billionths of a second, disseminating the exact time through their signals expressed as the UTC Universal Coordinated Time global standard. http://www.esa.int/Our_Activities/Navigation/Galileo_starts_to_tell_UTC_the_world_s_time May be of some interest Cheers, 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.
[time-nuts] OT - but of interest?
As many on this list are amateur radio operators the following might be of interest: http://www.phonesat.org/ The project asks amateurs to monitor transmissions from cell phones that have been placed in orbit. From the homepage: PhoneSat satellites are emitting packets on the amateur radio spectrum to report different types of message. The details of these packets can be found on the packets page. If you are an amateur radio operator and you can receive these packets, you have the great opportunity to contribute to the project by submitting them. The dashboard page will give you all the information you need to track the satellites in real time. -- Bob Smither, PhD Circuit Concepts, Inc. = Top 10 reasons why those that love the United States should not support the Republican or Democratic party: First Amendment; Second Amendment; Third Amendment; Fourth Amendment; Fith Amendment; Sixth Amendment; Seventh Amendment; Eighth Amendment; Ninth Amendment; Tenth Amendment = smit...@c-c-i.com http://www.C-C-I.Com 281-331-2744(office) -4616(fax) attachment: smither.vcf___ 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] HP5065B !!!
OK, that was just to get your attention! What do you call a modified HP 5065A that can give you an Allan Deviation of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second? I call it the SUPER HP 5065A. Any of these links will get you to the document describing it. Have a look and see what it's all about! Enjoy, Corby http://leapsecond.com/corby/Super-5065A-Project.pdf or http://leapsecond.com/corby/superproj10.docx or http://www.febo.com/pages/HP5065A_SUPER for ___ 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] OT: Galileo starts to tell UTC, the world’s time
Hi David: Is there a receiver for these time signals? Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html David J Taylor wrote: Galileo starts to tell UTC, the world’s time Europe’s four Galileo satellites are now working as clocks accurate to a few billionths of a second, disseminating the exact time through their signals expressed as the UTC Universal Coordinated Time global standard. http://www.esa.int/Our_Activities/Navigation/Galileo_starts_to_tell_UTC_the_world_s_time May be of some interest Cheers, David ___ 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] OT - but of interest?
On 04/26/2013 06:01 AM, Bob Smither wrote: As many on this list are amateur radio operators the following might be of interest: http://www.phonesat.org/ The project asks amateurs to monitor transmissions from cell phones that have been placed in orbit. From the homepage: PhoneSat satellites are emitting packets on the amateur radio spectrum to report different types of message. The details of these packets can be found on the packets page. If you are an amateur radio operator and you can receive these packets, you have the great opportunity to contribute to the project by submitting them. The dashboard page will give you all the information you need to track the satellites in real time. Will radiation fry the cell phones before thy burn up on re-entry? They are expected to re-enter within weeks so there is a good chance they will not see a radiation event before they burn up. -- Chuck Forsberg WA7KGX c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] ngTADD-1
Thanks to all for the very helpful discussion. Appreciatively, Kevin On Apr 25, 2013, at 9:26 AM, Chris Albertson albertson.ch...@gmail.com wrote: The problem with analog 10MHz is the non-linear parts at each end of the fiber optic. It would be hard to get a nice sine wave at the output. I think if you have a requirement for very clean sine wave at the far end you'd best try to phase lock a local XO. Send a 10 MHz square wave down the fiber and use that to phase lock a local XO.I think almost all fiber systems use a PLL for clock recovery. Problem is the parts built into the jacks. On Thu, Apr 25, 2013 at 12:08 AM, Attila Kinali att...@kinali.ch wrote: Sorry, i was a bit unclear. What i meant with modulation was to use an analog scheme that never saturates the transmitter or receiver both in the max (fully on) or min (fully off) direction. Ie do not send 1's and 0's as it is common in the digital domain of networking, but an analog 10MHz sine. With that you get around of the non-idealities that come with on-off transmissions. -- 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 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] OT - but of interest?
On 4/26/13 6:01 AM, Bob Smither wrote: As many on this list are amateur radio operators the following might be of interest: http://www.phonesat.org/ The project asks amateurs to monitor transmissions from cell phones that have been placed in orbit. Except that the transmissions are from a separate radio. The cellphones are being used only for their sensors. ___ 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] HP5065B !!!
Hi Corby: That's great. Is there a lens system in the 5065 that shapes the light output so that it's all on the photo detector like in the reference paper? Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html cdel...@juno.com wrote: OK, that was just to get your attention! What do you call a modified HP 5065A that can give you an Allan Deviation of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second? I call it the SUPER HP 5065A. Any of these links will get you to the document describing it. Have a look and see what it's all about! Enjoy, Corby http://leapsecond.com/corby/Super-5065A-Project.pdf or http://leapsecond.com/corby/superproj10.docx or http://www.febo.com/pages/HP5065A_SUPER for ___ 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] HP5065B !!!
Pretty cool Corby! I have wondered about the line broadening caused by all that extra light energy being pumped into the filter cells... Looks like you have found the answer. Kind of makes you wonder why nobody else has ever done the experiment? -Chuck Harris cdel...@juno.com wrote: OK, that was just to get your attention! What do you call a modified HP 5065A that can give you an Allan Deviation of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second? I call it the SUPER HP 5065A. Any of these links will get you to the document describing it. Have a look and see what it's all about! Enjoy, Corby http://leapsecond.com/corby/Super-5065A-Project.pdf or http://leapsecond.com/corby/superproj10.docx or http://www.febo.com/pages/HP5065A_SUPER for ___ 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.
[time-nuts] HP 5065B !!!
Brook, It's all done with mirrors! No lenses. A reflector at the lamp end and a tapered mirror at the photocell end. I'll see if I can post an outline drawing. 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] HP5065B !!!
Hi Corby, On 04/26/2013 05:23 PM, cdel...@juno.com wrote: OK, that was just to get your attention! What do you call a modified HP 5065A that can give you an Allan Deviation of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second? I call it the SUPER HP 5065A. Any of these links will get you to the document describing it. Have a look and see what it's all about! Nice to see progress report from you on this project. Would you care to detail a little more of what changes you have done, what filter you used etc. so that fellow time-nuts like me could duplicate the improvement? Cheers, Magnus ___ 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] AN/URQ-10A
To all, I acquired a AN/URQ-10A frequency standard which appears to have received little or no service since its birth. There are no signs of ever being mounted in its mating rack and the unit has virtually no scratches or wear marks on it. Last night I finally managed to plug it in to see how it behaved. Obviously the D NiCads in the battery module were flat and need replacement so I left the battery module out of the unit. As expected, the unit powered up with all normal indications on the meter except for the outer and inner ovens. After about three hours the indication for the outer oven became normal but after four hours I still did not have any indication on the inner oven reading. By that time my pillow was calling me so I unplugged the unit to wait for further investigation fearing that if the heater was stuck full on, internal heat damage may result (if it hasn't already). But I did witness one observation that the inner oven meter indication briefly tweaked as the power supply was shutting down telling me that the heater element itself has continuity. This told me that the heater was probably hot and when the power went down, the control circuitry shut the heater drive transistor off (don't know if anyone has observed the design of the metering circuit in this thing but the meter is connected between the heater and the collector of the drive transistor. When cold, the transistor is fully conducting thereby pulling this point to ground. As the temperature reaches equilibrium, this point then become positive as the drive transistor starts to reduce conduction. The meter then sees a voltage at this point and indicates proper heater operation). Question #1: Does anyone have an idea as to how long one should wait to see an indication of inner oven operation? Given the time it took for the outer oven to come up, do I need more patience? Comment/question #2: I did download the schematics for the URQ-10 (not A version) from the febo website but after a little disassembly and from obvious indication of additional controls on the non-A URQ-10 schematics, this A version is a horse of a different color. A diligent search of the Internet has produced no results of information on the A version except for one original NAVSHIPS OP/SVC manual for it that went on eBay a little while ago (drats!). Comment/question #3: Not investing any additional time last night (sleep required), I simply tapped on the FE-10 oscillator module enclosure and found it to be as solid as a rock. I don't have time to do more peeking at present but assume that this is due to (what I believe) is a Dewar enclosure that is contained inside. Correct? If the inner oven has cratered, is the internal oven control circuitry contained in this enclosure accessible by any means or is it sealed forever? This unit may be old but it is certainly near collector status with regards to its physical condition. Any help, especially schematics, would be appreciated. Regards, Greg Muir This message was sent using IMP, the Internet Messaging Program. ___ 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] HP5065B !!!
Very nice bit of RD work on Corby's part. Mine is certainly working well after the modification, but I'm just blown away at the performance seen with Tom's unit. Another plot of the Super mod that's worth mentioning: http://www.ke5fx.com/5065A_vs_maser_mask.png Below 1000 seconds it has no trouble passing the spec limits for a passive H-maser! For contrast, teeypical LPRO-101 performance is shown in green, and the red trace is from the second-best commercial Rb standard I've seen (Symmetricom XPRO). -- john, KE5FX Miles Design LLC -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of cdel...@juno.com Sent: Friday, April 26, 2013 8:24 AM To: time-nuts@febo.com Subject: [time-nuts] HP5065B !!! OK, that was just to get your attention! What do you call a modified HP 5065A that can give you an Allan Deviation of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second? I call it the SUPER HP 5065A. Any of these links will get you to the document describing it. Have a look and see what it's all about! Enjoy, Corby http://leapsecond.com/corby/Super-5065A-Project.pdf or http://leapsecond.com/corby/superproj10.docx or http://www.febo.com/pages/HP5065A_SUPER for ___ 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] OT - but of interest?
On 4/26/13 9:18 AM, Chuck Forsberg WA7KGX N2469R wrote: On 04/26/2013 06:01 AM, Bob Smither wrote: As many on this list are amateur radio operators the following might be of interest: to track the satellites in real time. Will radiation fry the cell phones before thy burn up on re-entry? They are expected to re-enter within weeks so there is a good chance they will not see a radiation event before they burn up. Total dose will be very small (after all astronauts live in LEO) So you'd worry about cosmic rays and single event effects. A lot of modern parts are pretty latchup immune for a variety of reasons. Things that tend to die are FETs that are switching power.. they don't have much voltage margin on the gates and dumping a bunch of charge from a single event might push it over the threshold and you get a gate rupture (SEGR). SEU and related SEFI are probably pretty unlikely. Feature size is small, and the odds of hitting one that's actually being used are low. There's an external watchdog to reset it as well. The camera will probably show some speckles. They fly a lot of unmodified commercial equipment on ISS (and on Shuttle, when we still flew it) and they typically have MTBF of a month or so for the really soft parts. Most stuff will last a year before it dies. It's unclear whether there has ever been a documented case of a satellite failing due to latchup in space. Surrey is pretty cagey about their on-orbit performance at that level of detail, but they use mostly commercial parts. ___ 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] AN/URQ-10A
To all, I acquired a AN/URQ-10A frequency standard which appears to have received little or no service since its birth. There are no signs of ever being mounted in its mating rack and the unit has virtually no scratches or wear marks on it. Snip Snip Comment/question #2: I did download the schematics for the URQ-10 (not A version) from the febo website but after a little disassembly and from obvious indication of additional controls on the non-A URQ-10 schematics, this A version is a horse of a different color. A diligent search of the Internet has produced no results of information on the A version except for one original NAVSHIPS OP/SVC manual for it that went on eBay a little while ago (drats!). Snip Snip Any help, especially schematics, would be appreciated. Regards, Greg Muir ** Greg, There's a manual for the URQ-10 at http://www.auctiondose.com/detail_product/121069053683/frequency_standard/, which seems to be another auction site. Dave M ___ 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] AN/URQ-10A
OOPsss Never mind. That acution is long gone. Sorry for the false alarm. Dave M Dave M wrote: To all, I acquired a AN/URQ-10A frequency standard which appears to have received little or no service since its birth. There are no signs of ever being mounted in its mating rack and the unit has virtually no scratches or wear marks on it. Snip Snip Comment/question #2: I did download the schematics for the URQ-10 (not A version) from the febo website but after a little disassembly and from obvious indication of additional controls on the non-A URQ-10 schematics, this A version is a horse of a different color. A diligent search of the Internet has produced no results of information on the A version except for one original NAVSHIPS OP/SVC manual for it that went on eBay a little while ago (drats!). Snip Snip Any help, especially schematics, would be appreciated. Regards, Greg Muir ** Greg, There's a manual for the URQ-10 at http://www.auctiondose.com/detail_product/121069053683/frequency_standard/, which seems to be another auction site. Dave M Dave M ___ 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.
