Re: [time-nuts] hammond 77589
Hi Ed, From: Ed Breya e...@telight.com I just noticed one more thing - if the NTC thermistor in the schematic is the actual one that senses the oven temperature, then the oscillator and bridge are one in the same. If this is the case, then the oscillator amplitude could be proportional to bridge imbalance - if the NTC is being balanced by the 1414 ohm resistor. Yes, it is. It works in AC at 315 Hz. Thank you so much. Bye, Jean-Louis ___ 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] hammond 77589
Hi all, Will someone know what it could be? http://www.stben.net/DSC_0338.JPG http://www.stben.net/DSC_0339.JPG Thanks for your help. Bye, Jean-Louis ___ 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] hammond 77589
It's a part of an oven regulator. - Original Message - From: Jean-Louis Noel j...@stben.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, January 15, 2013 11:24 AM Subject: [time-nuts] hammond 77589 Hi all, Will someone know what it could be? http://www.stben.net/DSC_0338.JPG http://www.stben.net/DSC_0339.JPG Thanks for your help. Bye, Jean-Louis ___ 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] hammond 77589
Hi, From: WB6BNQ wb6...@cox.net Is your roughly the same size ? Do you know or have a picture of what it came out of ? It's 23.97mm diameter, 23.60mm height and weight 34.35gr R 1-2 and 2-3 = 13.56 ohms from 1-3 = 27.12 ohms. http://www.stben.net/sch.jpg I hope I don't have to open it! Thanks for your help. Bye, Jean-Louis ___ 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] WWVB PM Receiver
Hi, From: Bob Camp li...@rtty.us A tuned antenna probably is going to provide all the selectivity you'd need. Another possibility is to modify your old circuit like that: http://www.maxmcarter.com/rubidium/2012_mod/index.html Bye, Jean-Louis ___ 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] Leap second? Yay or nay?
Hi, From: Poul-Henning Kamp p...@phk.freebsd.dk Testing software for correct handling of leap-seconds is a major undertaking which very few people have the kit and skill to do. A software that crashes/behaves badly when the time is updated is a bad software. Bye, Jean-Louis ___ 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] Leap second? Yay or nay?
Hi, From: Poul-Henning Kamp p...@phk.freebsd.dk Yes, platitudes like that make for good sound-bites, but it doesn't bring us any closer to a solution. I am not considering timescale. What happens to your system if you set the clock in the past by hand? Mine continues working has it should be. Bye, Jean-Louis ___ 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] So, how did you spend your leapsecond?
Hi, From: Brendan Minish ei6iz.bren...@gmail.com Dealing with servers and this issue Mine worked OK. But, to avoid the next we could make a habit of sneezing toward West! Bye, Jean-Louis ___ 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 GPS navigation is the weakest point,
Hi, From: Azelio Boriani azelio.bori...@screen.it Yes, now wondering if there are L1/L2 simulators out there... better googling around. http://wireless.vt.edu/symposium/2011/posters/GPS%20Signal%20Simulation_Brown.pdf Bye, Jean-Louis ___ 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] looking for data on time code display
Hi, From: Steve Byan steveb...@verizon.net NSN 6625003684180 == NSN: 6625-00-368-4180 INDICATOR, DIGITAL D Part No: 0N194800 Price Range: n/a Delivery Range: n/a Mfr/OEM/Agencies: JOINT ELECTRONICS TYPE DESIGNATION SYSTEM, NATIONAL SECURITY AGENCY == Bye, Jean-Louis ___ 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] Fast than light neutrino
Hi Pablo, From: pablo alvarez pabloalvarezsanc...@gmail.com Here you have the reports on the CERN's timing chain. http://www.ohwr.org/documents/111 Questions are welcome! Singapore, Singapore: Packets lost (100%) 87.106.213.168 Amsterdam2, Netherlands: Packets lost (100%) 87.106.213.168 Florida, U.S.A.: Packets lost (100%) 87.106.213.168 11 ms1 ms1 ms www.on4jln.be [10.149.85.30] 220 ms 7 ms 6 ms 10.158.0.1 381 ms90 ms88 ms 109.88.204.1 410 ms 4 ms19 ms 212.68.211.13 519 ms10 ms14 ms 212.68.211.133 6 8 ms10 ms13 ms 212.3.232.1 712 ms20 ms12 ms ae-6-6.ebr1.London1.Level3.net [4.69.136.246] 817 ms23 ms27 ms ae-47-47.ebr1.Paris1.Level3.net [4.69.143.110] 920 ms19 ms30 ms ae-1-51.edge5.Paris1.Level3.net [4.69.139.203] 10 106 ms 101 ms 110 ms 11-INTERNET.edge5.Paris1.Level3.net [212.73.200.54] 11 *** Request timed out. 12 *** Request timed out. Cool! Bye, Jean-Louis ___ 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] noise of a 5370
Hi, From: Mike S mi...@flatsurface.com Measuring the jitter of the unit's own clock isn't particularly useful or interesting for anything other than checking for proper operation. I agree for the purpose, but the noise mesured is not only the clock noise. It's the sum of all noises. Not only the clock, 200MHz multiplier and input circuits but the whole chain is tested. The first three are surely the most noisiest. Bye, Jean-Louis ___ 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] noise of a 5370
Hi, I have a question for you guys. I am currently fixing a 5370B and when I check the internal noise I got 23.2pS I think it is a bit too much. Could you check yours noise? 1) Connect a cable between the rear panel FREQ STD OUT to front panel START input connector 2) Set the input impedances at 50 ohms 3) Attenuator switches at /1 4) AC/DC switches to DC 5) Input slope switches to positive (high) 6) Level controls to preset 7) START COM 8) display rate fully clockwise 9) SAMPLE SIZE 10K 10) STATISTICS STD DEV I got 23.2ps with 2ps unstability. Is that OK? Thanks for your help. Bye, Jean-Louis ___ 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] noise of a 5370
Hi Mike, From: Mike S mi...@flatsurface.com 23.2pS I think it is a bit too much. Could you check yours? The manual says to expect jitter of 35 ps typical, 100 max. One of mine is ~30, the other ~20. Yes, I saw that! But, where is the logical when your display starts at 100fS? Bye, Jean-Louis ___ 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] noise of a 5370
Hi Everyone, From: Mark Spencer mspencer12...@yahoo.ca Mine shows approx 25 ps. I am currently fixing a 5370B and when I check the internal noise I got 23.2pS I think it is a bit too much. So, it's not too bad for a device saved from trash! Ebay 120681814403. Thanks. Bye, Jean-Louis ___ 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] SR620 calibration
Hi All, From: Jean-Louis Oneto jean-louis.on...@obs-azur.fr I have a scan of the schematics (A3 format), but it is rather heavy (3.6MB); Do you know of a place to store such a beast ? Copy: http://www.on4jln.be/infos/manuals.shtml Bye, Jean-Louis ___ 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] CS reservoir depletion
Hi Magnus, From: Magnus Danielson mag...@rubidium.dyndns.org As you can see on page 28 vials remains untouched till everythings are in place and else broken. No, do read at page 27 first. There is some handling in a glove-box filled with argon and movement from that one before final assembly etc. Yes, but I think you can find a solution to break the vials when everything is in place. Safer! Bye, Jean-Louis ___ 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] CS reservoir depletion
Hi Robert, From: Robert Vassar rvas...@rob-vassar.com You could probably safely handle a small quantity of Rb in a home lab environment for a short period of time. Pure Cesium would be a significant risk. As you can see on page 28 vials remains untouched till everythings are in place and else broken. http://jila01.colorado.edu/pubs/thesis/bennett/ch3.pdf For a vial of cesium check ebay 280612515679 Bye, Jean-Louis ___ 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] optically pumped frequency standards
Hi Chris, From: Chris Caudle ch...@chriscaudle.org How does changing the current change the output wavelength of a solid state diode emitter? Theory, explanations and equations : http://hal.archives-ouvertes.fr/docs/00/20/97/49/PDF/ajp-jphys_1984_45_2_239_0.pdf Bye, Jean-Louis ___ 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] CS reservoir depletion
Hi, From: Robert Lutwak rlut...@gmail.com Before this indelible conversation goes too far, note that cesium beam frequency standards are explicitly included on the U.S. ITAR list under §121.IV.28 and that, under §120.10.a, this prohibits the dissemination of :-) http://hal.archives-ouvertes.fr/docs/00/22/17/25/PDF/ajp-jphyscol198142C830.pdf Bye, Jean-Louis ___ 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] CS reservoir depletion
Hi, From: jimlux jim...@earthlink.net pretty much anything in space is a defense article) I can't imagine they could have done such mistake! http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2doc=GetTRDoc.pdfAD=ADA509345 (second page) http://tycho.usno.navy.mil/ptti/ptti2001/paper2.pdf Bye, Jean-Louis ___ 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] Question on GPS and reference standards
Hi Chris, From: Chris Albertson albertson.ch...@gmail.com What phase noise should be expected if a conventional PPL was used? Phase-locked Loop Circuit Design H. Wolaver: http://www.on4jln.be/pll_wolaver.pdf Bye, Jean-Louis ___ 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] Loran?
Hi, From: Chris Albertson albertson.ch...@gmail.com Also according to them radar never was an acronym. OED says: radar orig. U.S. [f. radio detection and ranging.] Bye, Jean-Louis ___ 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] USB Low Cost GPS Timing Receiver
Hi, From: Brooke Clarke bro...@pacific.net But if the tracking computer had much better time the short run would no be needed. Install a NTP on that computer http://www.ntp.org/ Basically, only the 1pps is needed and will discipline the local oscillator. Bye, Jean-Louis ___ 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] USB Low Cost GPS Timing Receiver
Hi, From: Hal Murray hmur...@megapathdsl.net Install a NTP on that computer http://www.ntp.org/ Basically, only the 1pps is needed and will discipline the local oscillator. Nit pick: You need more than just a PPS to get time. You also need something else to tell you which second a pulse corresponds to. Most GPS units come with a serial port that does that. Sure, but you don't need that information all the time and when it is online it can synchronize with a stratum 1 server to know that information. Bye, Jean-Louis ___ 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] temperature stability basics
Hi Beale, From: beale be...@bealecorner.com I assume dewar flasks are limited to aerospace applications. :-) You keep your coffee hot in it! Bye, Jean-Louis Noel, OO1J ___ 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.
