Re: [time-nuts] Need a Watch Recommendation
Even my pre civil war pocket watches should be good enough for your needs. Better than a minute/day. But for some (many) time-nuts it's about wants, not needs. My clocks and watches that can be heard across the room qualify me as old school time nut. (My DOB qualifies me as just plain old.) On Mon, 5 Mar 2018 03:20:40 -0500, Don Murray via time-nuts wrote: >Hi Bill... >- >My Rolex GMT Master was stolen back in '75, >so no luck on that. - Rolex is a bit pricey for >my needs. >- >My Seiko CQ001M, one of the first Seiko Digitals, >was amazing. - Over the time I had it, it varied less >than plus/minus 1 second against WWV. - I carried >a Radio Shack Time Kube with me, when I was >challeneged, as to the accuracy of that watch! - >It died many- years later, and the replacement >innards were- totally "loose!" >- >Yes, I think that Time Kube qualifies me as a >"Old School Time Nut! - ;-) >- >TNX Bill. >- >73 >Don >W4WJ >- >In a message dated 3/5/2018 1:31:04 AM Central Standard Time, wb...@gci.net >writes: >- > My 37 year old Rolex day-date gains less than 2 sec/day compared to GPS clock. >Rolex standard is +6/-2 sec/day. >Regards, NL7F >On Mon, 5 Mar 2018 01:38:06 -0500, Don Murray via time-nuts wrote: >>Hello Time Nuts... >>-n++ >>After 6 years of no troubles, in sync with WWV any >>hour of the day, flawless transfer between >>standard and daylight time my Stauer Titanium >>Atomic wristwatch bite the dust a year ago. >>-n++ >>Since then, Stauer has sent me three replacements, >>each with some type of problem. -n++ >>-n++ >>So it looks as if I am in need of a new wristwatch, >>which will give me some kind of time accuracy. >>-n++ >>So, Time Nuts... -n++any suggestions or recommendations? >>-n++ >>TNX >>-n++ >>73 >>Don >>W4WJ >>___ >>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. >Bill Beam >NL7F >___ >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. Bill Beam NL7F ___ 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] Need a Watch Recommendation
My 37 year old Rolex day-date gains less than 2 sec/day compared to GPS clock. Rolex standard is +6/-2 sec/day. Regards, NL7F On Mon, 5 Mar 2018 01:38:06 -0500, Don Murray via time-nuts wrote: >Hello Time Nuts... >- >After 6 years of no troubles, in sync with WWV any >hour of the day, flawless transfer between >standard and daylight time my Stauer Titanium >Atomic wristwatch bite the dust a year ago. >- >Since then, Stauer has sent me three replacements, >each with some type of problem. - >- >So it looks as if I am in need of a new wristwatch, >which will give me some kind of time accuracy. >- >So, Time Nuts... - any suggestions or recommendations? >- >TNX >- >73 >Don >W4WJ >___ >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. Bill Beam NL7F ___ 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] How well does GPS work in the Arcitic?
On Mon, 14 Aug 2017 18:19:56 -0700, jimlux wrote: >On 8/14/17 5:58 PM, Bill Beam wrote: >> GPS orbit inclination is 50-60deg. >55 degrees Current TLE show I= low of 51.7 to I= high of 56.6. >> At my latitude of 65N satellites are about 15deg above the horizon to the >> north. >That would be for satellites that are "over the pole" with respect to you? yes >___ >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. Bill Beam NL7F ___ 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] How well does GPS work in the Arcitic?
GPS orbit inclination is 50-60deg. At my latitude of 65N satellites are about 15deg above the horizon to the north. Regards. On Mon, 14 Aug 2017 16:45:22 -0700, Hal Murray wrote: >The satellite orbits only go so far north? If you are far enough north for >that to be a problem, can you pick up the satellites across the pole? >I have several days of NMEA log files from 68 N. I think it will be simple >after I have done it, but it may be a while before I get time to plot them. >Does anybody have (non-Windows) code to that? >-- >These are my opinions. 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. Bill Beam NL7F ___ 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] Version 5 wrong leap second
My LH v5.00 showed leap second as 00:00:60 on a Tbolt. Not good Previous June 2015 LH v3.10 correctly showed 23:59:60 If interested, I have screen captures. Bill Beam NL7F ___ 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] Another GPSDO quirk - KS-24361
Hi Hal, All looks normal to me. Something appears to have driven f of both units off. The DAC is typical of recovery and overshoot of an upset in f. Since both LTE-Lite and KS-24361 experienced an upset at the same time, the cause must be external. Maybe a glitch in the GPS data stream. I am running a KS-24361 pair as stand alone units, each with its own GPS reciever and an LTE-Lite. Regards Bill, NL7F On Tue, 16 Feb 2016 01:58:16 -0800, Hal Murray wrote: >http://users.megapathdsl.net/~hmurray/time-nuts/GPSDO/KS-volt-2016-Feb-14.png >The red dots are the DAC voltage. >The green dots are the frequency of the KS24361 as seen by a HP 5334B with >option 010 using its internal crystal. The blue dots are the other channel >connected to a LTE-Lite. >I just noticed that I'm logging the DAC voltage from the REF-1 (the one with >the GPS) and the frequency from the REF-0 (the one with the 10 MHz output and >PPS). >-- >These are my opinions. 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. Bill Beam NL7F ___ 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] LIGO detects gravitational waves
The ring-down is due to the combined BH ringing down from oblate to spherical and rotateing while ringing. The wave contains most of the lost mass/energy. There likely was also EM energy radiated from the surrounding BH disks, but not observed here. Bill\ NL7F On Sat, 13 Feb 2016 17:34:45 -0600, Bill Hawkins wrote: >IMHO, the decay seems backwards because we are watching the growth of >the event as the black holes approach each other, reaching a maximum at >collision. >Don't know why the signal drops off after the collision. May be because >gravity stops changing, or maybe because the resulting object left the >universe - well, not if mass and energy are conserved. Or did the wave >contain all of the radiated energy? >Disclaimer: My field of study was not physics. >Bill Hawkins >-Original Message- >From: Bob Stewart >Sent: Saturday, February 13, 2016 2:35 PM >Hi Tom, >Thanks for posting this. I'm looking at the timelab plot, and the only >thing I can relate that to is a musical note played backward. IOW, the >decay seems backwards to me. >Bob - AE6RV >___ >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. Bill Beam NL7F ___ 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] NPR story on coupled pendulums
Yes. The Q is increased. And for a pair operating out of phase (the desired mode), external common mode disturbances are mitigated. On Thu, 30 Jul 2015 10:14:45 -0700, Eric Garner wrote: Is there any stability benefit to having a bunch of coupled pendulum clocks? On Wed, Jul 29, 2015 at 4:22 PM, Bill Beam wb...@gci.net wrote: These University Of Lisbon Scientists have rediscovered a very old wheel. Old physics: Two coupled nearly identical harmonic oscillators have two stable states. They will operate with relative phase = zero or 180deg. How they are coupled is not an issue; they only need to be able to transfer energy one to the other. Regards On Wed, 29 Jul 2015 13:44:19 -0500, Bill Hawkins wrote: They talk about sound pulses affecting the pendulums. Sounds more likely that the mechanical vibration transmitted through the aluminum bar affects the escapements. Perhaps the 'tock' side generates the strongest pulse, and the 'tick' side is sensitive enough to be affected by that pulse. That would soon have the clocks synchronized out of phase, provided the mounting arrangement did not absorb too much of the pulse energy. The situation is similar to synchronizing a TV vertical oscillator (running a bit slow) with the received sync pulse from the broadcast station, no? Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Tuesday, July 28, 2015 10:55 PM To: time-nuts@febo.com Cc: Hal Murray Subject: [time-nuts] NPR story on coupled pendulums University Of Lisbon Scientists Solve Pendulum Clock Mystery Two professors at the University of Lisbon say they have discovered why the pendulums of clocks set on the same surface will eventually swing together in opposing directions. http://www.npr.org/2015/07/28/427178282/university-of-lisbon-scientists- solve- pendulum-clock-mystery I thought the NPR story was not very interesting. (But it probably wasn't targeted at time-nuts. :) -- Here is the paper: Huygens synchronization of two clocks http://www.nature.com/srep/2015/150723/srep11548/full/srep11548.html -- These are my opinions. 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. Bill Beam NL7F ___ 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. -- --Eric _ Eric Garner ___ 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. Bill Beam NL7F ___ 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] NPR story on coupled pendulums
These University Of Lisbon Scientists have rediscovered a very old wheel. Old physics: Two coupled nearly identical harmonic oscillators have two stable states. They will operate with relative phase = zero or 180deg. How they are coupled is not an issue; they only need to be able to transfer energy one to the other. Regards On Wed, 29 Jul 2015 13:44:19 -0500, Bill Hawkins wrote: They talk about sound pulses affecting the pendulums. Sounds more likely that the mechanical vibration transmitted through the aluminum bar affects the escapements. Perhaps the 'tock' side generates the strongest pulse, and the 'tick' side is sensitive enough to be affected by that pulse. That would soon have the clocks synchronized out of phase, provided the mounting arrangement did not absorb too much of the pulse energy. The situation is similar to synchronizing a TV vertical oscillator (running a bit slow) with the received sync pulse from the broadcast station, no? Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Tuesday, July 28, 2015 10:55 PM To: time-nuts@febo.com Cc: Hal Murray Subject: [time-nuts] NPR story on coupled pendulums University Of Lisbon Scientists Solve Pendulum Clock Mystery Two professors at the University of Lisbon say they have discovered why the pendulums of clocks set on the same surface will eventually swing together in opposing directions. http://www.npr.org/2015/07/28/427178282/university-of-lisbon-scientists- solve- pendulum-clock-mystery I thought the NPR story was not very interesting. (But it probably wasn't targeted at time-nuts. :) -- Here is the paper: Huygens synchronization of two clocks http://www.nature.com/srep/2015/150723/srep11548/full/srep11548.html -- These are my opinions. 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. Bill Beam NL7F ___ 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] Visual clock comparison
On Sun, 19 Apr 2015 23:25:10 -0400, Chuck Harris wrote: 1/5th second is simply the rate at which the balance wheel on a standard stopwatch ticks... 18000BPM. -Chuck Harris You must mean 18000BPH. There are many balance wheel rates in use from 4.5BPS to 10BPS and higher. My Elgin jitterbug stopwatch runs at 40BPS. Bill Beam NL7F ___ 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] Visual clock comparison
Try this: Listen to time ticks thru earphones (zero time delay) and loudspeaker (1ms/ft delay) simultaneously. I am unable to hear a difference out to 15 -20ft away from the speaker. This is consist with http://whirlwindusa.com/support/tech-articles/opening-pandoras-box/ Delays of order 2-4ms between right and left ear will be perceived as sound coming from left or right, and not perceived as a time difference. Bill Beam NL7F ___ 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] LTE Lite time error
Odd indeed. My LTE-lite is one second late, appears to have already added the pending leap second. I can compare with four other GPS timeing receivers using time pulse on DCD line. The NMEA data reports in error. I am awaiting reply from JL. This is not good for an eBay sniper Bill, NL7F On Sun, 25 Jan 2015 12:12:55 -0800, Tom Van Baak wrote: Hi Paul, Odd, my LTE-Lite appears spot on. Let's take this off-list and see what's going on. If anyone else has been logging SkyTraq NMEA or binary from the LTE-Lite let us know. Bill Beam NL7F ___ 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] LTE Lite time error
Be careful with 'eyeball data'. GPS receiver does not generate NMEA time data and the leading edge of PPS at the same time. Programs like Tac32 (totally accurate clock) and Lady Heather increment the time display at the leading edge of PPS with a value 1 second greater than the previous NMEA data time. I am able to run multiple GPS receivers into multiple computers running Tac32. The LTE-lite displays one second earlier than all the others. Prior to the announcement of Leap Second Pending in the GPS data stream the LTE-lite agreed with all other units. Now it does not. On Mon, 26 Jan 2015 22:59:36 +0100, Mike Cook wrote: Yes there is certainly an error here: With my timing module I was just eyeballing the output on a windows platform , comparing GUI data. I have just linked the module up to a BeagleBone Black syncGd with NTP and this is the NMEA msg log: root@bb3:/home/mike/serial-ports# while read GGA; do echo `date` $GGA; done /dev/ttyO4 Mon Jan 26 21:51:07 UTC 2015 $GPGGA,215106.000,4847.3526,N,00216.3005,E,1,04,2.8,192.8,M,47.0,M,,*5C Mon Jan 26 21:51:07 UTC 2015 $GPGLL,4847.3526,N,00216.3005,E,215106.000,A,A*56 Mon Jan 26 21:51:07 UTC 2015 $GPGSA,A,3,25,12,06,31,3.0,2.8,1.0*3A Mon Jan 26 21:51:07 UTC 2015 $GPRMC,215106.000,A,4847.3526,N,00216.3005,E,000.0,173.5,260115,,,A*60 Mon Jan 26 21:51:07 UTC 2015 $GPVTG,173.5,T,,M,000.0,N,000.0,K,A*0D Mon Jan 26 21:51:07 UTC 2015 $GPZDA,215106.000,26,01,2015,00,00*54 Mon Jan 26 21:51:07 UTC 2015 $PSTI,00,2,0,4.6,,*30 snip The time data is all a second late so they appear to have a serious issue. Le 26 janv. 2015 + 02:47, Bill Beam wb...@gci.net a +ªcrit : snip Odd indeed. My LTE-lite is one second late, appears to have already added the pending leap second. I can compare with four other GPS timeing receivers using time pulse on DCD line. The NMEA data reports in error. snip Bill Beam NL7F ___ 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] GPS antenna length correction
On Mon, 28 Apr 2014 13:10:05 -0700, Chris Albertson wrote: On Mon, Apr 28, 2014 at 6:52 AM, Brian Lloyd br...@lloyd.com wrote: ..., additional antenna cable introduces a fixed delay value and hence a fixed constant that gets added to each path regardless of direction. It seems to me that this would produce a much fuzzier solution to position and/or variation in timing. Knowing cable length and propagation velocity, would allow the software to subtract that constant from all ranges and thus provide a more correct position and time solution. Is this not the case? I think you have it exactly correct. The antenna location determines the geometry and the cable length adds only a fixed offset. Many GPS receivers have a command where you can tell them a cable delay.But also you have to think about the other end of this. How long is the cable that is used for the output FROM the GPS receiver. This cable introduces a delay also. You might even have a distribution amplifier of at least a TTL chip acting as a driver or maybe a MAX232 chip doing level conversion. There is a total system delay. But really this only matters if you are keeping absolute time of day. Delay does not mater for frequency measurement or for time interval measurement. As mentioned earlier the position of the receiver is indeterminate unless the vector displacement from the antenna to the receiver is accounted for. Accounting for the cable delay will only correct the absolute time. Imagine a 100m antenna feed line; the receiver could be anywhere within 100m of the antenna (even above it or at it). The algorithm that computes position needs to know this. It is possible the programmer assumes that the receiver is directely below the antenna; but I don't know what programmers assume. It would be safest to display the position of the antenna. This discussion suggests that manufacturers should make it clear that the position is of the antenna or otherwise -- 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. Bill Beam NL7F ___ 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] Crude Survey Technique
On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote: If you need a very tall pole that is 100% vertical then hang a weighted rope from a tall support. Then go to the other end and watch the seconds tick down. Be carefull!... A plumb bob does not hang vertically (point to center of Earth). Since the suspension point is undergoing accelerated motion the bob will be deflected toword the equator. This problem also applies to bubble levels, etc. And there are other perturbations due to Sun, Moon, Jupiter, etc. which are not constant. Which leads to the question: How to make the pole vertical? Newtons laws are NOT valid in a noninertial frame. (That's why the Coriolis force was invented.) Thus the term rocket science. Bill Beam NL7F ___ 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] Crude Survey Technique
That's my point. 'Coriolis force' was invented to make it appear that Newtons laws were valid in an Earth based frame. On Thu, 21 Nov 2013 18:06:54 -0700, Don Latham wrote: Coriolis ain't a force :-) Newtons laws are NOT valid in a noninertial frame. (That's why the Coriolis force was invented.) Bill Beam NL7F ___ 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 Time and Lady Heather.
On Thu, 20 Dec 2012 14:39:21 +1100, Neville Michie wrote: I have just found out how to get sidereal time from Lady Heather. (You put t=GMST in the command line, or alias target line, and the Lady comes up in Sidereal Time, ticking away in Sidereal seconds.) (Also you can get LMST, LAST or GAST.) Now, as a time nut, I have questions. How is a leap second handled? Leap seconds are handled by the GPS receiver, not by Lady Heather. Some receivers add a 60th second for the leap second, others insert an extra 00th second. Sidereal time is time observed by watching stars rather than the sun. In fact it is the source of all knowledge about how fast our planet rotates, and the basis for all our time scales. A sidereal second is shorter than a physical second by about one second in six minutes, so as to fit 366.25 sidereal days into the year of 365.25 solar days. At the Vernal Equinox there is a situation where Solar seconds exactly match the Sidereal second count, as zero, but how can a time nut know if this is in error? How accurate is it? In microseconds, nanoseconds? My interest in Sidereal time is because I have two pendulum clocks mounted on the same brick wall and they interfere with each other. By running one one sidereal time they are independent. The problem is to get a source of sidereal time to measure the performance of the sidereal clock. It is no problem to divide 10 MHz down to sidereal seconds, but how do you synch. the seconds? This is where the Lady helps. But I do not know how I can get really accurate seconds markers as convenient as the PPS from my Thunderbolt. Even though Lady Heather can display LMST, LAST or GAST it runs at solar rate, not siderial rate. Each second still rolls over at the top of the solar second. Thus there is a one second sawtooth error in siderial time with a 365+ second repitation period. I have two Thunderbolts running copies of Lady Heather and two other GPS receivers running Tac32. Tac32 also runs at solar rate, but can display siderial time to nearest 0.01 sec. So I was able to compare Lady Heather with Tac32. cheers, Neville Michie Bill Beam NL7F ___ 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] gravity controlled pendulumn clock?
On 12/12/2011 1:19:31 PM, Magnus Danielson (mag...@rubidium.dyndns.org) wrote: On 12/12/2011 01:37 AM, Jim Lux wrote: On 12/11/11 4:04 PM, Tom Van Baak wrote: GCPC -- gravity controlled pendulum clock (elevation) intriguing. From your parenthetical remark, I'm assuming you move the whole assembly up and down to adjust the speed? I was thinking about a huge mass that moves around? let's see.. period is proportional to sqrt(1/g) g is proportional to 1/r^2, so period is proportional to r. Earth is roughly 7000 km radius, so moving it 1 meter higher or lower changes the period by 1part in 7million... interesting. Hmm... how does the near-field gravitational pull behave? The far-field is surely r^-2, but wonder about the near-field effect. Need to grab some paper and pen and convince myself. For a spherical homogenious mass of radius R; g goes as r^+1 for rR and as r^-2 for rR. (This is a freshman undergraduate Physics problem.) Bill 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. Bill Beam NL7F ___ 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: Basics of voltage calibration?
John, Check this out: www.gellerlabs.com On 3/14/2009 5:33:45 PM, John Ackermann N8UR (j...@febo.com) wrote: I'm interested in learning some basics about precision voltage calibration (as can be realized by the hobbyist, not Josephson Junction systems!). A Google search hasn't turned up anything like a tutorial. Anyone know of any good app notes or other references on things like standard cells, zener references, precision potentiometers, etc? -- and how to use them? Thanks, John ___ 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. Bill Beam NL7F ___ 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] Thunderbolt Leapsecond missing
This behaviour is exactly correct. GPS time never has a leap second. Leap seconds are only added to UTC. Note that the UTC Offset is now 15 seconds, no longer 14 seconds. Maybe it's time to review Time (nut) keeping 101 On 12/31/2008 3:06:09 PM, Mark Sims (hol...@hotmail.com) wrote: My Thunderbolt showed no leap second (set to display GPS time) ... went from 23:59:59 to 00:00:00. 15 seconds after the hour the Leapsecond Pending indicator went off. _ Send e-mail anywhere. No map, no compass. http://windowslive. com/oneline/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_anywhere_122008 ___ 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. Bill Beam NL7F ___ 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] Thunderbolt Lives
In this case the Stored Position will never go green since 1) the Self survey has not been configured to store the surveyed position and 2) you have not manually stored a position. You have two choices: 1) Click on Setup, select Position..., fill in an appropriate position and click Save Segment. or 2) Click on Setup, select Self-Survey..., set the Save Position Flag to Save and click Save Segment. Then click on Control and Restart Self-Survey. The unit was shipped configured not to save position after a self-survey. This assures a Self-Survey after power cycle. Regards, Bill (NL7F) On 7/22/2008 12:49:59 PM, David Ackrill ([EMAIL PROTECTED]) wrote: David C. Partridge wrote: The self survey will go green after it has completed the survey as will the stored position. The Self Survey has gone green as Self-Survey Progress is at 100% now, and the Thunderbolt is seeing 7 out of the 8 satellites at the moment. However, Stored Position is still coloured yellow. I'll leave it monitoring over night to see what happens. Dave (G0DJA) ___ 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. Bill Beam NL7F ___ 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: You know your getting old when...
What is perfectly acceptable can be found here http://physics.nist.gov/cuu/Units/units.html and here http://physics.nist.gov/cuu/Units/prefixes.html I'm old enough to have used ngstrm as a measure of length. But I have never heard of even one kelvin-coulomb (KC) let alone 80 of them. NASA blew a Mars mission because they bungled thier units. Regards (73 only if using CW) On 9/6/2007 9:49:38 PM, James R. Gorr ([EMAIL PROTECTED]) wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY It does seem perfectly acceptable when working HF to *say* KCs (I'll be listening around x MHz, plus or minus 10 KCs). Writing it does sort of date a person though, which simply shows a level of experience. Re: [time-nuts] OT: You know your getting old when... Does OT mean off topic or old timer? :-) --- Jack Hudler [EMAIL PROTECTED] wrote: When you find yourself writing 80 KC instead of 80 KHz. Jack Bill Beam NL7F ___ 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-C Programmatic environmental Impact Statement (PEIS)?
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] On 7/24/2007 5:40:31 PM, Brooke Clarke ([EMAIL PROTECTED]) wrote: Hi: I've received a letter from the navigation office of the USCG that's a notice intent to conduct a PEIS in accordance with: National Environmental Policy Act of 1969 and, Dept of Homeland Security Management Directive 5100.1 and, USCG Commandant's Instruction M1475.1D (related to Environmental Impacts). http://www.navcen.uscg.gov/loran/default.htm What gives? It appears that Coast Guard want's to abandon Port Clarence LORAN station and move the LORAN transmitter to Nome. -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.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. Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.476 / Virus Database: 269.10.11/909 - Release Date: 7/20/2007 4:39 PM ___ 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] HP E1938 oscillator
Hello, Has anyone on list ever received one of these oscillators? Three weeks ago I sent him $ as instructed below. Since then he has stopped responding to e--mail and I have no oscillators. Is he away on vacation, sick in hospital, in jail? Or does HP/Agilant have other ideas about the distribution of thier surplus oscillators? Bill On Sat, 26 May 2007 14:07:12 -0700, Richard (Rick) Karlquist wrote: I still have dozens of surplus E1938A's if anyone wants one. They are in worked the last time it was turned on, but no guarantee of specs condition. I can't accept money for these units. Rick Karlquist N6RK E1938A circuit designer On Fri, 25 May 2007 19:01:47 -0700, Richard (Rick) Karlquist wrote: Just send me your address and $8.95 for a priority mail flat rate box for each oscillator. Rick Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.472 / Virus Database: 269.8.13/840 - Release Date: 6/8/2007 3:15 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Pendulums and Atomic Clocks and Gravity :probably more than you want to know...
On Sat, 02 Jun 2007 11:53:18 +1200, Dr Bruce Griffiths wrote: Bill Beam wrote: Mike, I was afraid someone would say 'Riemann tensor' The problem with the Riemann tensor is that I don't think that anyone here can write in down in detail for this problem (let alone solve it). I surely can not. I also don't think that anyone here is ready for the idea that there is no such thing as gravitational force, and that in the absence of any other force everything is in free fall. World lines and geodesics, oh my! (inside joke). Surely its not necessary to write down the detailed Riemann Tensor for this simple case? Not with Keplers laws available. (As stated.) Surely the Schwarzchild metric is a good approximation to situation of a test mass orbiting the Earth? Keplers second law is good enough. If so, then perhaps the methods espoused by Wheeler can be used to derive the orbits? In every case where I have reinvented the wheel it has come out round with a hole in the center for the axle. I don't do wheels anymore. Bill Bruce Bill Beam NL7F -- Internal Virus Database is out-of-date. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] FW: Pendulums Atomic Clocks Gravity
On Thu, 31 May 2007 01:52:34 +1200, Dr Bruce Griffiths wrote: Bill Beam wrote: Assume satellite in circular orbit. (Not really necessary.) Assume test mass's released at rest wrt satellite center of mass. Inner test mass released closer to Earth and outer released farther from Earth. Also assume no air currents, no relativity, no luminiferous ether, no static, no s- -t. It helps if this problem is solved in a proper (Earth based) inertial frame and to consider the total energy (kinetic plus potential) of the test masses. But there are no strictly inertial frames based on the Earth. The earth rotates around its axis (neglecting precession, nutation etc), it also orbits the sun which in turn ... An actual test of these predictions would be somewhat expensive to carry out. The damping due to the air in the shuttle or ISS (as well as a host of other small effects) would tend to damp out such motion. The question is how quickly? This contradicts the last assumption stated above. Clearly a satellite based frame is non inertial and therefore Newtons laws of motion are not valid. Gentlemen: Those of you who have never taken a university physics course are excused for confusion over centripital/centrifugal/psudo forces. Some of you who did take a university physics class spent too much time asleep in class. Regards, Bill Beam NL7F ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] FW: Pendulums Atomic Clocks Gravity
On Tue, 29 May 2007 16:31:40 +1200, Dr Bruce Griffiths wrote: Ulrich, Didier Talking about forces, gravitational fields etc makes no physical sense if the observer's reference frame isn't specified. For an observer in/on a satellite orbiting about the Earth with their reference frame fixed with respect to the satellite. There is no gravitational field, whatever methods chosen to measure a gravitational field (within the satellite) will always produce a null result. Not true. Very simple experiments will show occupants of the satellite that they are in a non-inertial reference frame. (Release a few test masses about the cabin and you will observe that they move/accelerate for no apparent reason, unless the satellite is in free fall which you'll know soon enough,) The experimenter must conclude that the satellite is undergoing acceleration due to the influence of an attractive (gravitational) field. Just because NASA calls it 'microgravity' doesn't make it true. It means NASA is wrong. Weightlessness is not the same as zero-g. Pendulum clocks fail to work, given an initial push they will just rotate around the pivot, provided the pivot suitably constrains the motion of the pendulum (ie a shaft running in a set of ball or roller bearings or similar and not a knife edge pivot). If, however the satellite acts as a rigid body and has a large enough diameter then it would be possible for an observer on the satellite to detect a gravitational field gradient. Therefore, you must conclude that somewhere inside the satellite g is not zero. If the satellite is large enough and orbits close enough to the Earth, this gravitational field gradient would tear the satellite apart. For an observer located on the Earth however the motion of the satellite can be accurately described by Newtonian mechanics where the centripetal pull of gravity acts on the satellite causing it to have a centripetal (radial) acceleration as it orbits the Earth. Bruce Regards, Bill Beam (PhD, physics 1966, past tenured Associate Professor of Physics) Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] FW: Pendulums Atomic Clocks Gravity
On Tue, 29 May 2007 22:27:42 +1200, Dr Bruce Griffiths wrote: Bill Bill Beam wrote: On Tue, 29 May 2007 16:31:40 +1200, Dr Bruce Griffiths wrote: Ulrich, Didier Talking about forces, gravitational fields etc makes no physical sense if the observer's reference frame isn't specified. For an observer in/on a satellite orbiting about the Earth with their reference frame fixed with respect to the satellite. There is no gravitational field, whatever methods chosen to measure a gravitational field (within the satellite) will always produce a null result. Not true. Very simple experiments will show occupants of the satellite that they are in a non-inertial reference frame. (Release a few test masses about the cabin and you will observe that they move/accelerate for no apparent reason, unless the satellite is in free fall which you'll know soon enough,) The experimenter must conclude that the satellite is undergoing acceleration due to the influence of an attractive (gravitational) field. Just because NASA calls it 'microgravity' doesn't make it true. It means NASA is wrong. Weightlessness is not the same as zero-g. Only, if you insist on sticking to Newtonian physics with all its attendant problems. This discussion began as a classical problem. The relativistic effects are many orders of magnitude smaller than Newtonian (v/c=2.6e-5). For example: A test mass released on the Earth side of the satellite cabin will advance in its own orbit a few mm/sec faster than one released on the far side due to purely classical differences in orbits. Easily observable without even using a timepiece. Once your feet leave the ground, not even Newtonian mechanics is intuitive. Who would have thought that 'putting on the brakes' to leave orbit would cause a satellite to speed up Pendulum clocks fail to work, given an initial push they will just rotate around the pivot, provided the pivot suitably constrains the motion of the pendulum (ie a shaft running in a set of ball or roller bearings or similar and not a knife edge pivot). Run the numbers - depends on how hard the push. Consider sheeparding of material in Saturn rings by small moons. If, however the satellite acts as a rigid body and has a large enough diameter then it would be possible for an observer on the satellite to detect a gravitational field gradient. Therefore, you must conclude that somewhere inside the satellite g is not zero. A finite gradient doesn't imply that the field itself is nonzero, except of course towards the extremeities of the satellite. Of course it does. If g=0 everywhere in the neighborhood of a point then the gradient is zero. Else, what is the meaning of gradient? Grad not zero implies field not uniform implies not(field zero everywhere). Regards, Bill Beam (PhD, physics 1966, past tenured Associate Professor of Physics) Bill Beam NL7F Bruce ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] GPS Watch
Cassio has offered similar for several years. Their battery life was less than a day (rechargable). This one is only about half as chunky as Cassio. On 5/29/2007 5:45:33 AM, Jason Rabel ([EMAIL PROTECTED]) wrote: Before clicking on that link I was half expecting some goofy contraption that included a hard hat with a cone shaped GPS antenna on top... lol. Seriously though, I wonder what the battery life is like? Jason http://www.mainnav.com/ Somewhat chunky offering from China... Rob Kimberley ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] The first time nut?
On Sun, 27 May 2007 18:42:17 +, Poul-Henning Kamp wrote: In message [EMAIL PROTECTED], John Ackermann N8UR writes: [...]and if one was gaining a half second on the other, he would wear it on the outside of his wrist instead of the inside, so that gravity changed the rate of the tuning fork [...] I'd expect that the author got this wrong, it would be the temperature change that did it. Nope, The author got it right. I have an Accutron 214. It runs fast six up and slow twelve up. Regards, Bill, NL7F -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Pendulums Atomic Clocks Gravity
On Sat, 26 May 2007 13:34:24 -0700, Brooke Clarke wrote: Hi Bill: It's my understanding that a satellite is in free fall, hence zero g. 'Free fall' implies that g is not zero! If g=0 was true, then the satellite would not be falling at all. It is beacuse g is not zero, that the satellite is in 'orbit' rather than moving off in a straight line. Jumping off a cliff also is free fall and surely g is not zero. The only difference between the cliff jumper and a satellite in orbit is the satellite never reaches the ground. The rate of a clock does depend on g. Now a pendulum clock in orbit has infinate period, but not because g is zero. This is because the pendulum support point is also in orbit. This is no different than pushing a pendulum off a cliff. A pendulum swings back and forth because two forces act on the bob. One of the forces is mg and the other is the force of the pendulum support rod. Regards, Bill Of course there's a gravitational field at the location of the satellite, the one from Earth being the largest. Orbital mechanics gives me a headache so let's hear from someone more knowledgeable. Have Fun, Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.467 / Virus Database: 269.8.0/818 - Release Date: 5/25/2007 12:32 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Odd request
On 1/25/2007 12:50:46 PM, Mark Amos ([EMAIL PROTECTED]) wrote: Time-nuts I appreciate the comments regarding horological obsession. Mine started with a desire for an accurate master oscillator for my ham shack (built and use a couple Shera GPSDO's) and has blossomed into a much broader interest in time (Ex tempus, sapientia?) This has led me to a silly quest. I'd like to use a traditional clock face and hands as an output device for a 1PPS signal from my GPSDO. I know this is a very broad question, but does anyone have advice on where I might start hacking (or making) a mechanical clock face to accomplish this? Is there a simple clock design that I could start with to build my own? Maybe replacing a pendulum or escapement with a solenoid? Any examples to work from? Mark 1. Obtain a cheap quartz clock movement. Cut the at least one trace to the drive coil. 2. Place a 50-100 microfarad capacitor (electrolytic is ok) in series with the clock drive coil. You may have to fuss with the value to get it right. 3. Drive the clock coil-capacitor with the output of pin 4 of U8 of the Shera circuit. A typical quartz clock movement requires a 10-20 msec long 1-1.5 V pulse on the coil to step the clock one second. But each second is opposite polarity. Pin 4 of U8 is the heartbeat pulse. The capacitor takes the derivative of the heartbeat giving the necessary alternateing sign pulse train. Note that positive pulses will correspond to odd(even) seconds and negative pulses to even(odd) seconds. If the clock is odd number of seconds in error, then reverse the polarity to the clock. I have had a Shera circuit running three quartz wall clocks for months at a time. They only get out of time if I mess with them. This is a brute force, cheap (elegant) physicists solution, not a fancy electrical engineers solution. Bill Beam, NL7F Bill Beam NL7F -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.441 / Virus Database: 268.17.4/643 - Release Date: 1/21/2007 5:12 PM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] no 23:59:60 in TAC32
On Sun, 01 Jan 2006 08:55:19 -0500, John Ackermann N8UR wrote: Bill Beam said the following on 12/31/2005 11:45 PM: I have since compared UT+ raw data with TAC32 display as follows: UT+ raw data TAC32 display 12/31/05 23:59:59 same 12/31/05 23:59:60 1/1/06 00:00:00 12/31/05 23:59:60 1/1/06 00:00:01 1/1/2006 00:00:00 1/1/06 00:00:01 1/1/2006 00:00:01 same Isn't there an extra extra second there? The UT+ is showing two :60s; shouldn't there be only one? No. Each line of data above is not one line per second but is obtained from sequential D70 camera photos of the computer screen. Here the D70 takes about three photos per second. The D70 'phase' and UTC is random. Each line of data is from a snapshot of the computer screen. To draw a conclusion about reality from each snapshot requires knowledge of the UT+, TAC32, computer display and D70 behaviour. Another thing I haven't dug into, but if the GPS is outputting the time at the *next* PPS signal, the sentence will appear to be ahead compared to a display that's attempting to show the *current* time. Not sure if that's the case with TAC32. The UT+ does output a time sentence for each second. It also can (and does) accept comands from TAC32 and respond at other times. I don't know how and exactly when the computer displays occurs. The 1 PPS is also sent on the RS232 port. I can say for certain: During the 12/31/05 23:59:60 and 1/1/2006 00:00:00 seconds the TAC32 was never correct. At all other times (before and after) it was correct. The UT+ appeared to properly transition thru the leap second event. [ snip ] [snip] Bill Beam NL7F [EMAIL PROTECTED] or [EMAIL PROTECTED] -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.371 / Virus Database: 267.14.9/216 - Release Date: 12/29/2005 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] no 23:59:60 in TAC32
TAC32 failed to display 23:59:60. Within a few seconds (possibly/probably one second) the TAC32 time display was correct. The raw data stream from Motorola UT+ correctly showed 23:59:60 as the last second of 2005. TAC32 queries the UT+ for UTC-GPS offset at 20sec after each minute and at 00:00:22 'UTC=GPS+14 seconds' was correctly displayed. I have lots of uninteresting photos of TAC32 display... and one interesting photo of the raw data stream from the UT+. If anyone cares to post it I can send a photo. Regards, Bill Bill Beam NL7F [EMAIL PROTECTED] or [EMAIL PROTECTED] -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.371 / Virus Database: 267.14.9/216 - Release Date: 12/29/2005 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] no 23:59:60 in TAC32
I have since compared UT+ raw data with TAC32 display as follows: UT+ raw data TAC32 display 12/31/05 23:59:59 same 12/31/05 23:59:60 1/1/06 00:00:00 12/31/05 23:59:60 1/1/06 00:00:01 1/1/2006 00:00:00 1/1/06 00:00:01 1/1/2006 00:00:01 same I assume the UT+ raw data is correct UTC. During the 23:59:60 UTC second TAC32 gave two displays. The TAC32 apears to have 'stumbled' for a couple of seconds. The UT+ performed correctly. I obtained my data using a Nikon D70 digital still camera operated in 'burst' mode taking about three frames per second of the computer screen. Both the TAC32 display and UT+ raw data are shown together on the screen. If any one is interested I can send the data. I have 19 images. Each image is about 3MB. On Sat, 31 Dec 2005 22:05:14 -0600, Brian Kirby wrote: I was using a M12+ with TAC32+ - what I observed is it displayed 00:00:01 twice ! - it never indicated 23:59:60. Bill Beam wrote: TAC32 failed to display 23:59:60. Within a few seconds (possibly/probably one second) the TAC32 time display was correct. The raw data stream from Motorola UT+ correctly showed 23:59:60 as the last second of 2005. TAC32 queries the UT+ for UTC-GPS offset at 20sec after each minute and at 00:00:22 'UTC=GPS+14 seconds' was correctly displayed. I have lots of uninteresting photos of TAC32 display... and one interesting photo of the raw data stream from the UT+. If anyone cares to post it I can send a photo. Bill Beam NL7F [EMAIL PROTECTED] or [EMAIL PROTECTED] -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.371 / Virus Database: 267.14.9/216 - Release Date: 12/29/2005 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
