Re: [time-nuts] Sidereal timekeeping
Michael wrote: You are right, the right value for the crystal would be about 32859.27, but I thought that such a difference could be compensated in the circuitry, that's why I omitted the decimals. before you get into grinding I have a question on your chosen frequency. It doesn't square for me. 1,002737909350795 solar/sidereal time ratio x 32768 crystal frequency 32857,72 required frequency for sidereal clock with 2^15 divider chain I agree with your calculation. Here I ask Jim Lux for help, as when I wrote the first post I simply took that value from his article without re-checking. http://www.techbriefs.com/component/content/article/2299 Do we miss anything, Jim? Antonio I8IOV ___ 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] Sidereal timekeeping
On 5/18/11 2:18 AM, iov...@inwind.it wrote: Michael wrote: You are right, the right value for the crystal would be about 32859.27, but I thought that such a difference could be compensated in the circuitry, that's why I omitted the decimals. before you get into grinding I have a question on your chosen frequency. It doesn't square for me. 1,002737909350795 solar/sidereal time ratio x 32768 crystal frequency 32857,72 required frequency for sidereal clock with 2^15 divider chain I agree with your calculation. Here I ask Jim Lux for help, as when I wrote the first post I simply took that value from his article without re-checking. http://www.techbriefs.com/component/content/article/2299 I think there was an error in that article (most likely a typo somewhere in the transcription process). I'll go check. But your calculation above is correct. ___ 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] Sidereal timekeeping
Hi Ok, say you randomly pick a PIC 16LF1826 as your target device. It typically pulls 7 to 9 ua running with a 32KHz crystal as it's clock and 1.8 to 3.0 V on the supply. Max supply on the low power part is 3.6V so two cells in series is about right for it. An alkaline AA cell is up around 2700 maH according to the ever useful Wikipedia. 10 ua would drain the cell in 11.4 years. The AA's I buy don't last that long sitting on the shelf un-used. The only obvious issue is to figure out the motor drive side and see what driving it straight rather than with a switcher does to the motor current. That's going to involve hacking up a wall clock. Since the clock is likely a single cell gizmo, the current probably will be a bit high. There's always the LCD or LED version to think about Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Wednesday, May 18, 2011 8:09 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Sidereal timekeeping Hi The question can be easily worked out. A PIC running a 32,768 Hz clock will pull X ua doing this or that. I don't know X as I sit here, but it's a number that comes off a data sheet. That much current off of two or three AA cells will let you run for Y days. My guess is that Y is a pretty big number. If it's not, put in C's or even D cells. At some point the number gets big. The drive for the motor is pretty simple, or it was last time I did all this (1970's). Having the PIC drive the motor is not all that hard. The code likely fits in a pretty small part. Weather you use a PIC or something else is open to study. There probably are parts that pull less current running at low speed than the PIC. I can think of a half dozen parts I'd check out. I'd also look for something that's happy with less voltage than most of the PIC's. It would take more time to lay out the pc board than to write the code once you had a target processor and motor in mind. Bob On May 18, 2011, at 12:01 AM, Hal Murray wrote: li...@rtty.us said: In a full sized wall clock, most of the power is to the motor. On a wrist watch - it depends on how well the watch is built. Thanks. I think that means that it's not silly to generate a PPSS (Pulse per Sidereal Second) signal by counting to 364/365 of 32678 rather than letting a 15 bit counter wrap around. If most means 90% and we use another factor of 10 to implement the compare/reset, that only drops the battery lifetime by a factor of 2. Divide the target count by 2 and toggle one more FF if you need better symmetry on the output. --- Hacking the crystal adds another dimension to the hardware/firmware/software tower. Is there a term for that? -- The party line for something like this is that 1/2 the power goes into the bottom bit. (assuming we are talking about the logic and not the motor) I wonder what the power ratio (battery lifetime ratio) is for custom CMOS vs say, 4000 CMOS, or C, or HC, or low power CPLD or ??? The CPLD might be interesting since you don't have to drive external pins/pads. There is probably some 4000/HC chip that includes a counter but would save power because it doesn't bring the bottom bit or two out to a pin. -- These are my opinions, not necessarily my employer's. 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. ___ 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] Sidereal timekeeping
The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies a short current pulse to the motor. The pulses are alternating positive and negative polarity, so you'll need something like an H-bridge to drive it. Using a 3 volt supply instead of the 1.5 that the motor was designed for would supply more power than the motor needs if you keep the drive pulse the same width, but you should be able to reduce the pulse width until the energy is about the same as with 1.5 V drive and have the motor still operate. Without having actually tried it, I think you should be able to select a suitable tradeoff between reliable motor operation and power consumption just by adjusting the on time of the drive pulse - no voltage regulator or voltage dropping resistor needed. There's only one stator coil to the motor, and one drive signal, so you can't control motor direction. The magnetic structures are apparently deliberately asymmetric to ensure that the motor always rotates in one direction when it receives a pulse of the appropriate polarity. (Get the pulse polarity wrong, and the motor just doesn't rotate). Dave On Wed, May 18, 2011 at 9:20 AM, Bob Camp li...@rtty.us wrote: The only obvious issue is to figure out the motor drive side and see what driving it straight rather than with a switcher does to the motor current. That's going to involve hacking up a wall clock. Since the clock is likely a single cell gizmo, the current probably will be a bit high. ___ 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] Sidereal timekeeping
Hi: Here are some photos of the inside of a quartz clock and some related patent links: http://www.prc68.com/I/QuartzClk.shtml Have Fun, Brooke Clarke http://www.PRC68.com David Martindale wrote: The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies a short current pulse to the motor. The pulses are alternating positive and negative polarity, so you'll need something like an H-bridge to drive it. Using a 3 volt supply instead of the 1.5 that the motor was designed for would supply more power than the motor needs if you keep the drive pulse the same width, but you should be able to reduce the pulse width until the energy is about the same as with 1.5 V drive and have the motor still operate. Without having actually tried it, I think you should be able to select a suitable tradeoff between reliable motor operation and power consumption just by adjusting the on time of the drive pulse - no voltage regulator or voltage dropping resistor needed. There's only one stator coil to the motor, and one drive signal, so you can't control motor direction. The magnetic structures are apparently deliberately asymmetric to ensure that the motor always rotates in one direction when it receives a pulse of the appropriate polarity. (Get the pulse polarity wrong, and the motor just doesn't rotate). Dave On Wed, May 18, 2011 at 9:20 AM, Bob Campli...@rtty.us wrote: The only obvious issue is to figure out the motor drive side and see what driving it straight rather than with a switcher does to the motor current. That's going to involve hacking up a wall clock. Since the clock is likely a single cell gizmo, the current probably will be a bit high. ___ 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] Sidereal timekeeping
It's been a while since I did it, but as I recall, a simple way of driving the typical motor on a dime store clock is: FF-Q-)|-MOTOR+ .| FF-/Q+ The capacitor charges up during the times when the FF's output is level, and produces a spike of alternating polarity when the FF toggles. You need 1 level transition every second, so the FF has to toggle at a 1/2 HZ rate. -Chuck Harris David Martindale wrote: The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies a short current pulse to the motor. The pulses are alternating positive and negative polarity, so you'll need something like an H-bridge to drive it. Using a 3 volt supply instead of the 1.5 that the motor was designed for would supply more power than the motor needs if you keep the drive pulse the same width, but you should be able to reduce the pulse width until the energy is about the same as with 1.5 V drive and have the motor still operate. Without having actually tried it, I think you should be able to select a suitable tradeoff between reliable motor operation and power consumption just by adjusting the on time of the drive pulse - no voltage regulator or voltage dropping resistor needed. There's only one stator coil to the motor, and one drive signal, so you can't control motor direction. The magnetic structures are apparently deliberately asymmetric to ensure that the motor always rotates in one direction when it receives a pulse of the appropriate polarity. (Get the pulse polarity wrong, and the motor just doesn't rotate). 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] Sidereal timekeeping
It would be easy to drive the coil with a push-pull output that can be set to high impedance between pulses and returning the other side of the coil to a high impedance voltage divider across the supply rails with a sizable capacitor between the center. If necessary, a complementary pair/emitter follower can be used to lower the impedance (or reduce the current through the divider) even further. That way, a pulse to ground and a pulse to VDD respectively generate opposite polarity pulses of half the supply voltage across the coil. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: David Martindale dave.martind...@gmail.com Sender: time-nuts-boun...@febo.com Date: Wed, 18 May 2011 09:42:14 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] Sidereal timekeeping The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies a short current pulse to the motor. The pulses are alternating positive and negative polarity, so you'll need something like an H-bridge to drive it. Using a 3 volt supply instead of the 1.5 that the motor was designed for would supply more power than the motor needs if you keep the drive pulse the same width, but you should be able to reduce the pulse width until the energy is about the same as with 1.5 V drive and have the motor still operate. Without having actually tried it, I think you should be able to select a suitable tradeoff between reliable motor operation and power consumption just by adjusting the on time of the drive pulse - no voltage regulator or voltage dropping resistor needed. There's only one stator coil to the motor, and one drive signal, so you can't control motor direction. The magnetic structures are apparently deliberately asymmetric to ensure that the motor always rotates in one direction when it receives a pulse of the appropriate polarity. (Get the pulse polarity wrong, and the motor just doesn't rotate). Dave On Wed, May 18, 2011 at 9:20 AM, Bob Camp li...@rtty.us wrote: The only obvious issue is to figure out the motor drive side and see what driving it straight rather than with a switcher does to the motor current. That's going to involve hacking up a wall clock. Since the clock is likely a single cell gizmo, the current probably will be a bit high. ___ 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] Sidereal timekeeping
That's even simpler! You have to size the capacitor just right, but it's probably not too critical. Thanks Chuck Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Chuck Harris cfhar...@erols.com Sender: time-nuts-boun...@febo.com Date: Wed, 18 May 2011 14:09:39 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] Sidereal timekeeping It's been a while since I did it, but as I recall, a simple way of driving the typical motor on a dime store clock is: FF-Q-)|-MOTOR+ .| FF-/Q+ The capacitor charges up during the times when the FF's output is level, and produces a spike of alternating polarity when the FF toggles. You need 1 level transition every second, so the FF has to toggle at a 1/2 HZ rate. -Chuck Harris David Martindale wrote: The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies a short current pulse to the motor. The pulses are alternating positive and negative polarity, so you'll need something like an H-bridge to drive it. Using a 3 volt supply instead of the 1.5 that the motor was designed for would supply more power than the motor needs if you keep the drive pulse the same width, but you should be able to reduce the pulse width until the energy is about the same as with 1.5 V drive and have the motor still operate. Without having actually tried it, I think you should be able to select a suitable tradeoff between reliable motor operation and power consumption just by adjusting the on time of the drive pulse - no voltage regulator or voltage dropping resistor needed. There's only one stator coil to the motor, and one drive signal, so you can't control motor direction. The magnetic structures are apparently deliberately asymmetric to ensure that the motor always rotates in one direction when it receives a pulse of the appropriate polarity. (Get the pulse polarity wrong, and the motor just doesn't rotate). 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. ___ 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] light squared test
The local NBC news in las vegas reported tonight (5-18-11) that next week, piolets flying at night may find gps unreliable or unuseable do to lightsquared testing broadband internet equipment in a frequency band adjacent to gps frequency. And that las vegas falls within a 350 mile radius of this testing.. Anybody have anymore info on this test. I've been reading posts here on timenuts about likely interference to gps receivers . And the fcc rushing license's for lightsquared. But I wasn't aware of any tests. Does anyone know where lightsquared is testing its transmitters that las vegas would fall within lightsquared's 350 mile radius. ___ 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] light squared test
Try this and also other gpsworld.com articles. John K1AE http://www.gpsworld.com/survey/lightsquared-its-worse-you-think-11646?utm_so urce=GPSutm_medium=emailutm_campaign=Survey-Scene_05_18_2011utm_content=l ightsquared-its-worse-you-think-11646 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of tom jones Sent: Wednesday, May 18, 2011 10:50 PM To: time-nuts@febo.com Subject: [time-nuts] light squared test The local NBC news in las vegas reported tonight (5-18-11) that next week, piolets flying at night may find gps unreliable or unuseable do to lightsquared testing broadband internet equipment in a frequency band adjacent to gps frequency. And that las vegas falls within a 350 mile radius of this testing.. Anybody have anymore info on this test. I've been reading posts here on timenuts about likely interference to gps receivers . And the fcc rushing license's for lightsquared. But I wasn't aware of any tests. Does anyone know where lightsquared is testing its transmitters that las vegas would fall within lightsquared's 350 mile radius. ___ 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] light squared test
https://pilotweb.nas.faa.gov/PilotWeb/noticesAction.do?queryType=ALLGPSformatType=DOMESTIC 05/013 (A1221/11) - AIRSPACE GPS IS UNRELIABLE AND MAY BE UNAVAILABLE WITHIN A RADIUS OF 175NM AND CENTERED AT 360709N/1151140W OR THE LOCATION ALSO KNOWN AS THE LAS VOR 324.8 RADIAL AT 2.9 NM FROM THE SURFACE TO FL400 AND ABOVE. PILOTS WITHIN A 175 MILE RADIUS OF THE LAS VEGAS AREA ARE HIGHLY ENCOURAGED TO REPORT ANOMALIES TO THE GPS SIGNAL DURING THIS TEST. 0700-1300 DLY. 16 MAY 07:00 2011 UNTIL 27 MAY 13:00 2011. CREATED: 12 MAY 18:40 2011 On Wed, May 18, 2011 at 7:50 PM, tom jones epoch_t...@yahoo.com wrote: The local NBC news in las vegas reported tonight (5-18-11) that next week, piolets flying at night may find gps unreliable or unuseable do to lightsquared testing broadband internet equipment in a frequency band adjacent to gps frequency. And that las vegas falls within a 350 mile radius of this testing.. Anybody have anymore info on this test. I've been reading posts here on timenuts about likely interference to gps receivers . And the fcc rushing license's for lightsquared. But I wasn't aware of any tests. Does anyone know where lightsquared is testing its transmitters that las vegas would fall within lightsquared's 350 mile radius. ___ 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] light squared test
A short article about the LightSquared concerns in Nevada... _http://www.gpsworld.com/transportation/aviation/news/faa-warns-gps-could-su ffer-during-lightsquared-tests-in-nevada-11638?utm_source=GPSutm_medium=ema ilutm_campaign=navigate_05_16_2011utm_content=faa-warns-gps-could-suffer-d uring-lightsquared-tests-in-nevada-11638_ (http://www.gpsworld.com/transportation/aviation/news/faa-warns-gps-could-suffer-during-lightsquared-tests-in- nevada-11638?utm_source=GPSutm_medium=emailutm_campaign=navigate_05_16_201 1utm_content=faa-warns-gps-could-suffer-during-lightsquared-tests-in-nevada -11638) 73, Don, W4WJ In a message dated 5/18/2011 9:50:30 P.M. Central Daylight Time, epoch_t...@yahoo.com writes: The local NBC news in las vegas reported tonight (5-18-11) that next week, piolets flying at night may find gps unreliable or unuseable do to lightsquared testing broadband internet equipment in a frequency band adjacent to gps frequency. And that las vegas falls within a 350 mile radius of this testing.. Anybody have anymore info on this test. I've been reading posts here on timenuts about likely interference to gps receivers . And the fcc rushing license's for lightsquared. But I wasn't aware of any tests. Does anyone know where lightsquared is testing its transmitters that las vegas would fall within lightsquared's 350 mile radius. ___ 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] light squared test
Here is another article re: the test: http://www.gpsworld.com/transportation/aviation/news/faa-warns-gps-could-suf fer-during-lightsquared-tests-in-nevada-11638?utm_source=GPSutm_medium=emai lutm_campaign=navigate_05_16_2011utm_content=faa-warns-gps-could-suffer-du ring-lightsquared-tests-in-nevada-11638 or google for FAA Warns that GPS Could Suffer During LightSquared Tests In Nevada John K1AE -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of tom jones Sent: Wednesday, May 18, 2011 10:50 PM To: time-nuts@febo.com Subject: [time-nuts] light squared test The local NBC news in las vegas reported tonight (5-18-11) that next week, piolets flying at night may find gps unreliable or unuseable do to lightsquared testing broadband internet equipment in a frequency band adjacent to gps frequency. And that las vegas falls within a 350 mile radius of this testing.. Anybody have anymore info on this test. I've been reading posts here on timenuts about likely interference to gps receivers . And the fcc rushing license's for lightsquared. But I wasn't aware of any tests. Does anyone know where lightsquared is testing its transmitters that las vegas would fall within lightsquared's 350 mile radius. ___ 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 8508A Vector Voltmeter
Hi, I found an old HP 8508A in the store room at work, and it looks like a useful candidate for Time Nuts activities. It seems to work OK, and while it has GPIB, I don't at present have GPIB on my computer, but I can connect up a chart recorder. Has anybody any comments about using this instrument for comparison of references, for example? 73, Murray ZL1BPU ___ 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] lightsquared test
Thanks for the replies, I'de been searching internet for about an hour not finding much. I finally did find some info same as the replies here. Here are some additional links about the testing . The third link givs lat and long. http://www.avweb.com/avwebflash/news/FAA_Warns_Lightsquared_Tests_204654-1.html?CMP=OTC-RSS http://www.ainonline.com/news/single-news-page/article/rep-raps-lightsquared-faa-to-begin-interference-tests-29631/ https://www.faasafety.gov/files/notices/2011/May/Light_Square_-BVU_Flight_Advisory.pdf I will be monitoring with my gps here in las vegas to check for interferience.. ___ 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] Softpal VLF software?
Does anyone know if the lsoftpal softpal package is available? This is a VLF receiving program that uses a sound card and 1PPS to record signal strength AND phase shift in VLF signals. -- Chuck Forsberg WA7KGX N2469R 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.
[time-nuts] Efratom FRS manual PDF available
One of the posters to the sci.electronics.design newsgroup (remember newsgroups?) posted a PDF scan of the Efratom FRS manual, including schematics. 3mb, if there is interest in it, someone point me to a place to upload it. bob k6rtm ___ 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] Efratom FRS manual PDF available
I can put it on my site if you like Bob. On 2011-05-19 13:46, k6...@comcast.net wrote: One of the posters to the sci.electronics.design newsgroup (remember newsgroups?) posted a PDF scan of the Efratom FRS manual, including schematics. 3mb, if there is interest in it, someone point me to a place to upload it. bob k6rtm -- Cheers, Ken vk7...@users.tasmanet.com.au www.vk7krj.com 'It seems hard to sneak a look at God's cards. But that He plays dice and uses telepathic methods is something that I cannot believe for a single moment.' (Einstein's famous quote on Quantum theory) No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 9.0.901 / Virus Database: 271.1.1/3646 - Release Date: 05/19/11 04:34:00 ___ 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] Efratom FRS Manual now on ko4bb
I've uploaded the Efratom FRS manual to the Recent_Uploads section of ko4bb's site. bob k6rtm ___ 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] Softpal VLF software?
I've never heard of it, but Google quickly turns up this web page, where you can download it. http://www.lfsoftpal.com/ Joe Gray W5JG On Wed, May 18, 2011 at 9:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Does anyone know if the lsoftpal softpal package is available? This is a VLF receiving program that uses a sound card and 1PPS to record signal strength AND phase shift in VLF signals. -- Chuck Forsberg WA7KGX N2469R 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. ___ 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] Softpal VLF software?
Google found this http://www.lfsoftpal.com/ it was everything but the software. I had the idea too that I could monitor some stable LF and HF transmitters and use that to infer what the ionosphere is doing. Plan to use WWV and WWVB and compare the time I get from them to true UTC. I assume any difference and jitter is because of patch length. I've slowly getting the parts together On Wed, May 18, 2011 at 8:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Does anyone know if the lsoftpal softpal package is available? This is a VLF receiving program that uses a sound card and 1PPS to record signal strength AND phase shift in VLF signals. -- Chuck Forsberg WA7KGX N2469R 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. -- = 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.
Re: [time-nuts] Softpal VLF software?
There is a download link at the bottom of the right hand column. Joe Gray W5JG On Wed, May 18, 2011 at 10:47 PM, Chris Albertson albertson.ch...@gmail.com wrote: Google found this http://www.lfsoftpal.com/ it was everything but the software. I had the idea too that I could monitor some stable LF and HF transmitters and use that to infer what the ionosphere is doing. Plan to use WWV and WWVB and compare the time I get from them to true UTC. I assume any difference and jitter is because of patch length. I've slowly getting the parts together On Wed, May 18, 2011 at 8:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Does anyone know if the lsoftpal softpal package is available? This is a VLF receiving program that uses a sound card and 1PPS to record signal strength AND phase shift in VLF signals. -- Chuck Forsberg WA7KGX N2469R 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. -- = 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] Softpal VLF software?
On Wed, May 18, 2011 at 9:52 PM, Joseph Gray jg...@zianet.com wrote: There is a download link at the bottom of the right hand column. Did it work for you? Where you actually able to download it? I got a broken link. -- = 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.
Re: [time-nuts] Softpal VLF software?
Chris, Why not compare against a GPS timing receiver ? That would, presumably, remove path variations and diurnal shifts at the WWVB frequency. Any reasonable house standard (10e-9) would far exceed the variations seen at 5/10/15/20 MHz. BillWB6BNQ Chris Albertson wrote: Google found this http://www.lfsoftpal.com/ it was everything but the software. I had the idea too that I could monitor some stable LF and HF transmitters and use that to infer what the ionosphere is doing. Plan to use WWV and WWVB and compare the time I get from them to true UTC. I assume any difference and jitter is because of patch length. I've slowly getting the parts together On Wed, May 18, 2011 at 8:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Does anyone know if the lsoftpal softpal package is available? This is a VLF receiving program that uses a sound card and 1PPS to record signal strength AND phase shift in VLF signals. -- Chuck Forsberg WA7KGX N2469R 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. -- = 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] Softpal VLF software?
Apparently one needs LabChart which will set you back $360 ... Too bad. No free lunch. I got a broken link as well from download. I think, though, that Spectrum Lab, a lovely program from DL4YHF, http://www.qsl.net/dl4yhf/spectra1.html, will serve as a vlf soundcard rcvr among other things. There is, however, no phase comparator. I've used Spectrum Lab for some years now. Don Latham Chris Albertson On Wed, May 18, 2011 at 9:52 PM, Joseph Gray jg...@zianet.com wrote: There is a download link at the bottom of the right hand column. Did it work for you? Where you actually able to download it? I got a broken link. -- = 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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] Sidereal timekeeping
Analog quartz clocks may be used as slave clocks. You do not even have to disconnect the quartz movement. Just find the coil on the motor and drive it with a square-wave of 0.5 hertz, in series with a capacitor (about 50mfd) and a resistor (about 200 ohms) Each type of clock is different, though they all are driven by something like 1.5 V 20ms alternate polarity pulses. The actual values are not critical but must be determined for each type of clock. If the capacitor resistor combination is wrong it will not work. Too much signal will make motors pole and refuse to rotate. The capacitor charges when the polarity changes and that current operates the clock. The resistor sets the length of the pulse together with the capacitor value, as well as setting the maximum current. Just swap values until the action is quiet, definite and reliable. I have used this method on at least 4 different types of quartz clock, usually from a 5 volt logic signal. Cheers, Neville Michie ___ 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.
