Re: [time-nuts] Lightsquared questionfor SFO area....
Brian, I have four GPSDO systems running and logging on a hill West of Redwood City with a view of the South Bay. Let me know if I can help. Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Brian, WA1ZMS Sent: Friday, July 27, 2012 6:43 PM To: Time-Nuts Subject: [time-nuts] Lightsquared questionfor SFO area Does anyone know if there is ANY recent active Lightsquared testing taking place in the SFO area of the US? I'm dealing with a day-job issue with GPS clocks in the Bay Area showing GPS unlocked errors from 3rd party equipment. -Brian, WA1ZMS ___ 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] Why a 10MHz sinewave output?
Actually, I do have an earth available for calibration to my lab. It's just outside the window. During the day I can take sun sightings, and during the night star sightings (barring cloudy weather). I cannot measure the length of a second as accurately as other lab equipment can, but the expensive equipment in my lab that measures the second accurately cannot tell me time-of-day or day of year. (with the exception of a WWV or GPS receiver). Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: Wednesday, February 08, 2012 4:51 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Why a 10MHz sinewave output? On 02/08/2012 03:25 PM, Craig S McCartney wrote: We already have one of those that everybody can use. It's called the earth. Yes, but you don't have it hanging in a neat position in your office, living room or lab, now do you? Besides, if you are a time-nut your rock will be more time-accurate than the real thing. :) I haven't special ordered a backup earth for my lab, or at least I won't admit to it, as you all know that I have at least three operational and a few stand-bys to put into operation in case I need to service one of them. 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 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] Why a 10MHz sinewave output?
We already have one of those that everybody can use. It's called the earth. Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: Tuesday, February 07, 2012 12:41 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Why a 10MHz sinewave output? On 02/07/2012 09:02 AM, David J Taylor wrote: For the real analog fans, how about a 1 Hz sinewave output and watch for the zero-crossings! G Precise? No! 11 uHz sine anyone, 24 hours period? 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 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] Power grid experiment may drive Americas clocks cuckoo ?
Yet another challenge to proper time-keeping. I think that I will re-calibrate the sundial in my yard and declare it Montalvo Road Time (MRT) and darn to those who disagree! http://www.sltrib.com/sltrib/utes/52072031-68/clocks-power-grid-electric .html.csp Craig McCartney 160 Montalvo Road Palomar Park, CA 94062 ___ 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] degausing
Magnus, No, we did not think of that at the time. A good idea, but if it worked the customers at the trade show would have had to stand on their heads to see the picture properly. Craig McCartney WA8DRZ -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: Saturday, April 17, 2010 8:27 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] [OT] degausing Craig S McCartney wrote: A bit off topic, but likely interesting to time-nuts: In the early days of HDTV (late 80s - early 90s) we were at a European trade show and had to borrow, at the last minute, a large (~40) CRT-based HD monitor from a Dutch company that was also exhibiting there. We liked it so much that we purchased it for use at other trade shows. The very next show was in Sydney, Australia. The monitor would not converge and had funny rainbow patterns no matter how many times we degaussed it. Thinking it had been damaged in its half-way around the world shipment we called in the local representatives of the Dutch manufacturer and they were as stumped as we were. Finally, after they talked to engineers at the factory, the explanation was: Of course, that is a Northern Hemisphere monitor; the earth's magnetic field is much different in the Southern Hemisphere. It can't work there.. After the show we shipped it back to our headquarters in California and, sure enough, the picture was perfect. So, we had a HDTV monitor that doubled as a earth hemisphere detector, using magnetic flux differential. Needless to say, we only used it in northern hemisphere shows after that. Did you ever tried to run it upside down? 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 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] degausing
A bit off topic, but likely interesting to time-nuts: In the early days of HDTV (late 80s - early 90s) we were at a European trade show and had to borrow, at the last minute, a large (~40) CRT-based HD monitor from a Dutch company that was also exhibiting there. We liked it so much that we purchased it for use at other trade shows. The very next show was in Sydney, Australia. The monitor would not converge and had funny rainbow patterns no matter how many times we degaussed it. Thinking it had been damaged in its half-way around the world shipment we called in the local representatives of the Dutch manufacturer and they were as stumped as we were. Finally, after they talked to engineers at the factory, the explanation was: Of course, that is a Northern Hemisphere monitor; the earth's magnetic field is much different in the Southern Hemisphere. It can't work there.. After the show we shipped it back to our headquarters in California and, sure enough, the picture was perfect. So, we had a HDTV monitor that doubled as a earth hemisphere detector, using magnetic flux differential. Needless to say, we only used it in northern hemisphere shows after that. Craig McCartney WA8DRZ -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Dave Baxter Sent: Thursday, April 15, 2010 1:03 AM To: time-nuts@febo.com Subject: [time-nuts] [OT] degausing The shaker system I used to know of, was used to test early mobile phone network test systems (with CRT monitors in) that were intended for mobile use, and no magnetic field leaked out of that one. It was the size of a small refuse bin, stood about 2' high, (3' dia) verticaly on the floor, bolted down to a huge block of concrete, and liquid cooled! The movement was only a couple of mm at most, but the force it could exert was silly. As for degausing things after the event... Hear at the salt mine, we have a HP 3GHz network analyzer with CRT display we used to cart arround the country when servicing RF power amps. One site, a MRI research facility, the ambient magnetic field is strong enough to screw the display off the screen if you are not careful how you position the analyzer. You can also feel your toolbox being pulled sideways when walking around the outside of the building. Never affected any credit cards though, even when I forgot I had one on it's own in a coat pocket! (The main Tech guy at that site could somehow screw an alloy plate into the field near the MRI scanner, let it go, and it'd sit there in mid air! If you tried to get it out, not knowing how, the harder you tried, the hotter it got. The Miensner effect I believe.) We often had to put the whole analyzer through a large home made delousing coil when back at the office to get the display straight again. OK, that was only a monochrome tube (green) but I personaly have also recovered normal shadow mask colour CRT's in TV's and monitors in the past, but it takes time patience, and a 9 coil that uses so much power it gets too hot to hold if you run it for more than 10 seconds! Remember too, to take the coil WELL away from the CRT before turning it off! I've also seen an old guy at a customers site in the past demag a small colour tube using a small strong permanent U shaped magnet on a stick, spun between his fingers while moving it arround the affected area. Absolute magic to watch him doing that. I guess he's long retired now, if not pushing daisies. Regards. Dave B. ---Original Message-- Message: 6 Date: Wed, 14 Apr 2010 12:12:46 -0400 From: Bob Camp li...@rtty.us Subject: Re: [time-nuts] time-nuts Digest, Vol 69, Issue 31 To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Message-ID: 4d4ef6b7d229491eab69ea5b551da...@vectron.com Content-Type: text/plain; charset=us-ascii Hi I've found that in some cases you need to run multiple passes over multiple days to degauss a badly mag'd monitor. I'm sure that at some point they do indeed become irreversible. So far I haven't found one that a hula hoop sized coil won't eventually fix. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: Wednesday, April 14, 2010 8:15 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] time-nuts Digest, Vol 69, Issue 31 Dave Baxter wrote: I think you'll find that any stray fields from industrial shaker systems, are often from the connecting leads, especialy if not correctly positioned and layed out. The internal static and dynamic magnetic fields are Very well contained. Not necessarily. I did some shaker work at one company, and their shaker magnetized the CRT's on any computer that was within several feet of the shaker table. Sadly, the damage was irreparable. The screens were left with permanent rainbow splotches
Re: [time-nuts] Thunderbolt Group Buy
Me two... Craig McCartney Family History Genealogical Research in Northern California http://www.on-sitetraining.com/Research/ (650) 587-5802 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ian Sheffield Sent: Monday, May 05, 2008 8:47 AM To: time-nuts@febo.com Subject: [time-nuts] Thunderbolt Group Buy I would be interested also. (and thanks to those in time-nuts who negotiated the deal) Ian Sheffield, near Edinburgh, Scotland. ___ 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] PTS 310
Ulrich, This site should help you. http://www.febo.com/time-freq/hardware/PTS/index.html Craig -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ulrich Bangert Sent: Friday, May 11, 2007 4:01 AM To: Time nuts Subject: [time-nuts] PTS 310 Gents, I just managed to buy a second hand PTS 310 synthesizer on eBay in the remote-only version with parallel BCD interface. Has anyone of you a manual available in electronic form or at least some information on the pinning of the 50-pol Amphenol connector for setting the frequency? Best regards and thanks in advance Ulrich Bangert [EMAIL PROTECTED] Ortholzer Weg 1 27243 Gross Ippener ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.6.8/797 - Release Date: 5/10/2007 5:10 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Schematic of 5MHz frequency standard
Didier, Several years ago I obtained a number of those modules intending to build a GPS steered standard. At the URL below you will find a large (24MB) ZIP file that contains much of the data that I put together regarding these R-1051 frequency standards. Some of the files included are my original work and some are from other sources. I never completed adding a varactor and steering one of these modules because I got involved with the then easily available Z-3801A units. http://www.on-sitetraining.com/wa8drz/ Feel free to ask further questions - I may or may not recall all the details. Craig WA8DRZ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Didier Juges Sent: Monday, April 24, 2006 7:15 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Schematic of 5MHz frequency standard I bought one of those 5 MHz OCXO (ebay item 7611240664, http://tinyurl.com/q7lry) and I would like to modify it for use with a GPS receiver (add a varactor, convert to 12V operation for easy battery back-up and remove un-needed circuitry). I would appreciate it if anyone had the schematic. The explanations on eBay would probably be sufficient to do the job, but I would prefer to be sure of what I am doing rather than guess (tall order...) Thanks in advance. Didier KO4BB * * ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.5/322 - Release Date: 4/22/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.6/323 - Release Date: 4/24/2006 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] My leap second observations - NOT
I was all set up to spend Saturday setting up the routines to get the data from my 4 receivers, 2X Z3801A and 2X Z3816 to a log in order to add to the common knowledge of this event. However, Murphy struck in spades. Saturday at ~4:30am (Pacific time) we lost power - restoration happened after 6pm (0200Z in 2006) so I missed the event entirely. (I have a set of big UPS devices on the rack with the HP receivers, but alas, they are good for one hour at most.) So I have been crying in my beer all weekend and enviously reading all of your reports of the great event. :( :( Craig -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.14.10/218 - Release Date: 1/2/2006 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
