Re: [time-nuts] Lucent OMA and FE-405 DOCXO
Sadly the MetroPCS guy was a vendor at a now defunct ham swap meet. I've bought gear from the guy in the past, but don't know his name. -Original Message- From: Stanley timen...@n4iqt.com Sender: time-nuts-boun...@febo.com Date: Sun, 8 May 2011 22:25:52 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Lucent OMA and FE-405 DOCXO Does your friend have any documentation ? I wasn't even sure of the function of this board , so matching it with a GPS receiver was only a hunch. My plan was to remove the FE-405 and try to use it. Some time back I posted a request for info here on the FE-405 and posted what I found out about the DOCXO. The intent of the post was to share what I had found, I case another member happens on this part. I have seen them on the auction site but not much info. I know other similuar boards have rubidium and 5 Mhz crystals but not sure they are also GPSDOs. Stanley - Original Message - From: li...@lazygranch.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, May 08, 2011 8:03 PM Subject: Re: [time-nuts] Lucent OMA and FE-405 DOCXO http://www.n4iqt.com/lucent-oma-GPSDO/ For correct URL. I'm not sure about the intent of the email. I was talking to a guy who sets up shacks for MetroPCS and their time standards are Lucent. -Original Message- From: Stanley timen...@n4iqt.com Sender: time-nuts-boun...@febo.com Date: Sun, 8 May 2011 19:07:30 To: time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Lucent OMA and FE-405 DOCXO Another Cell phone site disciplined oscillator LUCENT OSCILLATOR MODULE OMA S2:02 408886042 Decoded the card edge connector and connected a Accutime 2000 to have a complete GPSDO. Details at : hxxp://www.n4iqt.com/lucent-oma-GPSDO/ ( cut and paste to browser address box and change xx to tt ) Stanley ___ 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 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] Another incermental improvement in atomic clocks
Timekeeping errors will be further reduced by better accounting for the effect of blackbody radiation on atomic clocks. See http://www.rdmag.com/News/2011/05/General-Science-Physics-Developing-An-Accurate-Means-For-Computing/?et_cid=1511177et_rid=54735850linkid=http%3a%2f%2fwww.rdmag.com%2fNews%2f2011%2f05%2fGeneral-Science-Physics-Developing-An-Accurate-Means-For-Computing%2f Francis Grosz ___ 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] Distribution amp
I know it has come up in the past so I thought I would check here before hunting one down in the outside world. Anyone have a suitable distribution amplifier that they are looking to part with? My consumer device count has exceeded my source capability. :) Please respond offline, save a few electrons. Thanks, Bob KI2L ___ 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] Overheard from NASA
Overheard from a senior NASA research metrologist: The only reason we're doing it is because we *can* (improving clock accuracy, said in the context of the aluminum clock). We can already time so accurately, just as an example, that if we launched a spacecraft today toward Sirius we could predict its location when the craft arrived many thousands of years from now, to within a thousand miles or so. That's not a precise quote but it is a close paraphrase. Heck, I thought that was why time nuts did it, anyway. Because it's there. George Mallory, 1924 ___ 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] Tbolt Temp Sensor
On 05/08/2011 02:29 PM, James Hall wrote: Peter, I have a Thunderbolt with the DS1620E temperature sensor that I would like to upgrade to to a C version. I think you said on Time-Nuts that you might have some of the C version chips. If so, how can I go about getting one or two from you? I’ll be glad to pay what you feel is reasonable. Thanks, Jim Hall W4TVI 7960 W Bayhill Ct. Boise, ID 83704 ___ 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. Hello, Jim. I'm selling them for $1.99 each + shipping. First Class padded envelope to ID should be about $1.50. You can send me a check or PayPal (sa...@standingwave.org). Thanks. -Pete ___ 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] Tbolt Temp Sensor
On 05/09/2011 09:24 AM, Peter Loron wrote: On 05/08/2011 02:29 PM, James Hall wrote: Peter, I have a Thunderbolt with the DS1620E temperature sensor that I would like to upgrade to to a C version. I think you said on Time-Nuts that you might have some of the C version chips. If so, how can I go about getting one or two from you? I’ll be glad to pay what you feel is reasonable. Thanks, Jim Hall W4TVI 7960 W Bayhill Ct. Boise, ID 83704 ___ 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. Hello, Jim. I'm selling them for $1.99 each + shipping. First Class padded envelope to ID should be about $1.50. You can send me a check or PayPal (sa...@standingwave.org). Thanks. -Pete Apologies! I hit reply without checking the addresses...too much blood in my coffee system. -Pete ___ 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] Overheard from NASA
On 5/9/11 8:25 AM, William H. Fite wrote: Overheard from a senior NASA research metrologist: The only reason we're doing it is because we *can* (improving clock accuracy, said in the context of the aluminum clock). We can already time so accurately, just as an example, that if we launched a spacecraft today toward Sirius we could predict its location when the craft arrived many thousands of years from now, to within a thousand miles or so. That's not a precise quote but it is a close paraphrase. Heck, I thought that was why time nuts did it, anyway. When it comes to good clocks on spacecraft, we're a long way away from better than we need, particularly for small power/mass/volume. Having a atomic clock on board would let you do things like one-way ranging, particularly techniques such as delta DOR, which can give you cross range measurements (i.e. azimuth). Knowing the position to 1000s of km may not be particularly useful, even at long distances, but as a practical matter, we want to know distances to cm or mm at Jupiter or Saturn distances. Given that Jupiter is about 600-800E9 meters away (call it a round 1E12 meters), that's a precision of 1 part in, say, 1E14. We use precise measurements of range rate (on the order of mm/s) to determine the gravity field, and from that the internal structure of a planet. The Juno spacecraft has a coherent transponder that contributes Allan deviation of around 1E-15 or 1E-16 over 1000 seconds, with the rest of the measurement system (transmitter on earth, receiver on earth, propagation uncertainty at 32/34 GHz) contributing roughly comparable amounts. The transponder (KaTS) receives a signal at 34 GHz from earth at a fairly low SNR and generates a carrier at 32 GHz with a fixed ratio of phase/frequency to transmit back. The SNR is limited by the power we can transmit on Earth (tens of kW, with BIG antenna gain) and the size of the antenna on Juno. IF we had a good clock on board, we wouldn't need to worry about the transmitter on earth and one way propagation uncertainty for the outbound path. A USO (quartz oscillator in a temperature controlled dewar) isn't in this class of performance (and is big and power hungry to boot). If you had a good onboard oscillator, you can do VLBI type measurements to measure not only range, but angle to a higher precision than is currently possible. ___ 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] JJY40
On Tue, Mar 29, 2011 Murray Greenman wrote:
I've also observed that JJY40 is now off the air. It has been excellent
reception down here in New Zealand for many years, generally better than
the JJY signal on 60kHz, where of course it competes with other signals.
JJY40 was typically strong enough to hear by ear during the day as well
as at night here, and fades considerably for an hour or two at sunrise
and sunset. There is some evidence that Japanese radio-controlled
('Atomic') clocks work in New Zealand using this signal, as there is no
closer source.
Murray, I was delighted this morning (10 May 2011) to see that my
little radio controlled clock that I have in Christchurch, NZ ( 9,518
Km from JJY40 ) indicated that it had synced using the 40KHz JJY
signal.
So after free running for something like 2 months, my radio clock is
once again correct.
The JJY40 station had been closed due to being inside the exclusion
zone of the Fukushima nuclear accident from the Japanese Earthquake
and Tsunami on March 11th 2011.
Regards, Geoff
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Re: [time-nuts] Overheard from NASA
Jim, keep in mind that that was not my statement but one made to a small group of people, including me, over at the Cape. The guy is a PhD (I know, I know, I am too, and what does it get me?) senior research scientist at NASA whose specialty is metrology. Now, you may be convinced that he is a complete idiot but I work with NASA quite often and I can assure you that they don't hire idiots as senior research scientists. I'm a statistician and in no way qualified even to have an opinion on this topic. Just thought it might interest the group. Bill On Mon, May 9, 2011 at 8:21 PM, Jim Lux jim...@earthlink.net wrote: On 5/9/11 8:25 AM, William H. Fite wrote: Overheard from a senior NASA research metrologist: The only reason we're doing it is because we *can* (improving clock accuracy, said in the context of the aluminum clock). We can already time so accurately, just as an example, that if we launched a spacecraft today toward Sirius we could predict its location when the craft arrived many thousands of years from now, to within a thousand miles or so. That's not a precise quote but it is a close paraphrase. Heck, I thought that was why time nuts did it, anyway. When it comes to good clocks on spacecraft, we're a long way away from better than we need, particularly for small power/mass/volume. Having a atomic clock on board would let you do things like one-way ranging, particularly techniques such as delta DOR, which can give you cross range measurements (i.e. azimuth). Knowing the position to 1000s of km may not be particularly useful, even at long distances, but as a practical matter, we want to know distances to cm or mm at Jupiter or Saturn distances. Given that Jupiter is about 600-800E9 meters away (call it a round 1E12 meters), that's a precision of 1 part in, say, 1E14. We use precise measurements of range rate (on the order of mm/s) to determine the gravity field, and from that the internal structure of a planet. The Juno spacecraft has a coherent transponder that contributes Allan deviation of around 1E-15 or 1E-16 over 1000 seconds, with the rest of the measurement system (transmitter on earth, receiver on earth, propagation uncertainty at 32/34 GHz) contributing roughly comparable amounts. The transponder (KaTS) receives a signal at 34 GHz from earth at a fairly low SNR and generates a carrier at 32 GHz with a fixed ratio of phase/frequency to transmit back. The SNR is limited by the power we can transmit on Earth (tens of kW, with BIG antenna gain) and the size of the antenna on Juno. IF we had a good clock on board, we wouldn't need to worry about the transmitter on earth and one way propagation uncertainty for the outbound path. A USO (quartz oscillator in a temperature controlled dewar) isn't in this class of performance (and is big and power hungry to boot). If you had a good onboard oscillator, you can do VLBI type measurements to measure not only range, but angle to a higher precision than is currently possible. ___ 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] Overheard from NASA
I wasn't intending to cast aspersions... I was more giving an example of somewhere that atomic clocks need more work. And, I'm pleased that this group/list exists.. It's pointed me towards some useful stuff to solve some problems with the KaTS, and, as well, the archives are a great resource to which to point colleagues for help on Allan dev, etc. FWIW, for flight, the hot ticket is going to be Hg ion, if they can ever get it qualified...the physics package is pretty well there, but the rest is slogging along. And if someone figures out how to use xray pulsars in a flight qualified way, we'll fall on them with gratitude. On May 9, 2011, at 18:37, William H. Fite omni...@gmail.com wrote: Jim, keep in mind that that was not my statement but one made to a small group of people, including me, over at the Cape. The guy is a PhD (I know, I know, I am too, and what does it get me?) senior research scientist at NASA whose specialty is metrology. Now, you may be convinced that he is a complete idiot but I work with NASA quite often and I can assure you that they don't hire idiots as senior research scientists. I'm a statistician and in no way qualified even to have an opinion on this topic. Just thought it might interest the group. Bill On Mon, May 9, 2011 at 8:21 PM, Jim Lux jim...@earthlink.net wrote: On 5/9/11 8:25 AM, William H. Fite wrote: Overheard from a senior NASA research metrologist: The only reason we're doing it is because we *can* (improving clock accuracy, said in the context of the aluminum clock). We can already time so accurately, just as an example, that if we launched a spacecraft today toward Sirius we could predict its location when the craft arrived many thousands of years from now, to within a thousand miles or so. That's not a precise quote but it is a close paraphrase. Heck, I thought that was why time nuts did it, anyway. When it comes to good clocks on spacecraft, we're a long way away from better than we need, particularly for small power/mass/volume. Having a atomic clock on board would let you do things like one-way ranging, particularly techniques such as delta DOR, which can give you cross range measurements (i.e. azimuth). Knowing the position to 1000s of km may not be particularly useful, even at long distances, but as a practical matter, we want to know distances to cm or mm at Jupiter or Saturn distances. Given that Jupiter is about 600-800E9 meters away (call it a round 1E12 meters), that's a precision of 1 part in, say, 1E14. We use precise measurements of range rate (on the order of mm/s) to determine the gravity field, and from that the internal structure of a planet. The Juno spacecraft has a coherent transponder that contributes Allan deviation of around 1E-15 or 1E-16 over 1000 seconds, with the rest of the measurement system (transmitter on earth, receiver on earth, propagation uncertainty at 32/34 GHz) contributing roughly comparable amounts. The transponder (KaTS) receives a signal at 34 GHz from earth at a fairly low SNR and generates a carrier at 32 GHz with a fixed ratio of phase/frequency to transmit back. The SNR is limited by the power we can transmit on Earth (tens of kW, with BIG antenna gain) and the size of the antenna on Juno. IF we had a good clock on board, we wouldn't need to worry about the transmitter on earth and one way propagation uncertainty for the outbound path. A USO (quartz oscillator in a temperature controlled dewar) isn't in this class of performance (and is big and power hungry to boot). If you had a good onboard oscillator, you can do VLBI type measurements to measure not only range, but angle to a higher precision than is currently possible. ___ 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 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] Lady Heather, VNWA, VE2ZAZ GPS Monitor on OS X
Finally got around to doing a bunch of work tonight. Got my lab Parallels machine all set up. Now have Lady Heather, DG8SAQ VNWA code, and the VE2ZAZ MoniTrol all running effectively in OS X. http://www.lensgarage.com/gallery3/index.php/Electronics-and-Ham-Radio/coolstuff Finally...Next comes the Station Automation code. ___ 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.
