[time-nuts] Re: Subject: Re: Leviton VTP24 Is this Time Accurate enough? - Line Frequency and TXOs
In Southern California Edison's region I know that 60Hz used as a time reference has been unstable in possibly the last 10+ years. I have found that depending on whether in the summer clocks which use this reference tend to run slower, and in the winter they run faster. Have you noticed that in some way it between running fast or slow the gain/loss combination averages out over the course of the year? Don Resor -Original Message- From: Thomas D. Erb Sent: Saturday, August 28, 2021 4:16 AM To: time-nuts@lists.febo.com Subject: [time-nuts] Subject: Re: Leviton VTP24 Is this Time Accurate enough? - Line Frequency and TXOs We have been running long term tests on a TXO chip we use for time keeping vs line frequency vs NIST time. Over 4 years the TXO is within 4 minutes Line Frequency 9 minutes The TXO is well within specification - and the line frequency is off because we lose power in our leafy Boston suburb a lot - and the control fall over to an older time keeping chip. Thomas D. Erb p:508-359-4396 f:508-359-4482 a:97 West Street, Medfield, MA 02052 USA e: t...@electrictime.com w:www.electrictime.com Tower & Street Clocks Since 1928 ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Leviton VTP24 Is this Time Accurate enough?
I inquired with Leviton as to the accuracy of the VTP24 24 Hour Programmable Timer with DST. https://www.leviton.com/en/products/vpt24-1pz Don Resor Here is the reply I received: Hello, Thank you for contacting Leviton technical support. According to the code it meets, it is required to have time keeping accuracy within 5 minutes every year. It also uses a crystal to keep time, as it must maintain the time even during power outages. Regards, Virgilio Dominguez Technical Services Representative II Leviton Manufacturing Co., Inc. 201 North Service Road., Melville, NY 11747 ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] WWVB converter
Here is what seems to be a circuit design to allow WWVB clock receivers work with the current signal format. 2012 WWVB Receiver Modification Modification makes homebrew receiver insensitive to WWVB's new biphase-shifted time code. http://www.maxmcarter.com/rubidium/2012_mod/ Donald Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Talking Clock
I believe this is the glass plate MkII Talking Clock which referred to in AUS. It was retired in 1990. Also shown is the digital replacement system. Progress is great, but in some ways it's also kind of sad. The speaking Clock pt1, Talking Clock https://youtu.be/fp4zlMZVcmM The Speaking Clock pt 2, Talking clock https://youtu.be/9LVzKHOodC4 Donald Resor N6KAW -Original Message- From: time-nuts On Behalf Of vilgot...@gmail.com Sent: Monday, September 30, 2019 9:50 PM To: time-nuts@lists.febo.com Subject: Re: [time-nuts] Talking Clock The electro-mechanical-optical clock was made obsolete years ago and the voice is now generated electronically. I think the reason it's being closed down is that the PSTN is digital and so delays are unpredictable leading to possible errors in the time. According to a news item I saw the company that runs the clock and supplies the audio wants to keep it going but the national network supplier (Telstra) is determined to close it down because of "network incompatibility". I made a talking clock with that format a few years ago. It is based on an AVR processor that uses the mains frequency as a reference. The voice is generated by an ancient speech synthesizer chip that sounds like Stephen Hawking and the time is simultaneously displayed on a VFD. A PIR detector switches off the outputs when there's no human around. It can be seen at https://www.youtube.com/watch?v=lmg0YsHlB3g=3s It wouldn't be hard to use the same platform to translate the time from a GPS receiver into the spoken and visual word. Morris -Original Message- -- Date: Tue, 1 Oct 2019 08:00:25 +1000 From: Neville Michie To: Discussion of precise time and frequency measurement Cc: Neville Michie Subject: [time-nuts] Talking Clock Here in Australia we are suffering the loss of one of the significant developments in accurate time keeping and dissemination. The talking clock, built in England, with sound tracks on rotating glass disks, has been on the Australian telephone system for more than half a century. The system was timed by quartz oscillators, synchronised to the local observatory time. Now in spite of the trivial cost of maintaining the system it has been removed by the money-hungry telco which took over the government run telephone system. Now it occurs to me that the sound tracks occupy a very small digital space, and with modern flash drives and a little logic the talking clock could be driven by any time nut's disciplined time source. So is there a time nut who could design a voice output that we could all use? ?At the third stroke the time will be?? cheers, Neville Michie ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Maas-Rowe DCB1 Circuit Diagrams, Time Regulation (other than 60Hz) revisited
For those who might still be interested in a modification to use another source besides 60Hz pulses to keep the clock "on time", I now have the full set of circuit diagrams for this bell clock-controller. If anyone wants to take a look at them, please email me privately at organli...@sonic.net Thanks Donald Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] WWVB Receiver
Here I found a complete "dead bug" style WWVB receiver project from 2017 on YT. #0001 WWVB Receiver Project - Part 1 https://youtu.be/zD_INHy3BBI Donald Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Clock accuracy
For curiosity sake, this sounds like it is a Master Clock > Slave Clock system. Are the slave clocks DC Impulse driven or do they have AC synchronous gearbox motors which then correct on/near the hour every 12 hours? For instance at 6 O'clock twice a day on let's say the 58th minute? You want something more accurate than a TCXO module which might plug into a slot on the backplane of the master clock? Donald Resor N6KAW -Original Message- From: time-nuts On Behalf Of paul swed Sent: Friday, July 19, 2019 6:34 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Clock accuracy Jim Boy did you actually hit the issues. I have run into all of them. The bearings are a real issue. I have one clock I need to pull down and lube. Pain in the butt. Regards Paul On Fri, Jul 19, 2019 at 9:20 AM Jim Harman wrote: > Somewhat tongue in cheek, from another relative beginner: > > There are also several seconday effects you will need to consider over > the next 100 years: > > -- Do you have a way of changing the battery in the clock without it > stopping? > -- Will the $10 clock's bearings last 100 years? > -- If the 1 pps output from your GPSDO comes directly from the GPS, > and not by dividing down the oscillator, how will you handle holdover > events, when it may skip some pulses? > -- Is the adjustment range of your oscillator sufficient to compensate > for > 100 years of drift? > -- Will the other components in your GPSDO (esp. electrolytic > capacitors) last 100 years? > -- Will the GPS system still be operating 100 years from now, or will > it go the way of LORAN? You might need a provision for seamlessly > switching to a different 1-pps source if the technology changes. > > > On Fri, Jul 19, 2019 at 5:10 AM Hal Murray > wrote: > > > > > > If I live another 100 years [Let`s say I take antioxidants ;-) ] > > > what > > sort > > > of error should I expect in this clock? [I know that it`s better > > > than 1 second per day] > > > > You didn't say anything about skipping leap seconds. > > > > Ignoring that part, and assuming you have a good antenna, and > > assuming > the > > GPS > > operators don't screwup and/or that your GPSDO has good enough > > holdover, it will be right on. > > > > Your system is tracking GPS. So the next question is what do you > > expect your clock to be tracking? If you want to track UTC, then > > you need to > research > > the > > offset between GPS and UTC. (Hint: It's not very big.) > > > > > > -- > > These are my opinions. I hate spam. > > > > > > > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, > > go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > > -- > > --Jim Harman > ___ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go > to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 60Khz received on Wide-band WebSDR
>From another list I was directed to this link for those who do not have a shortwave radio. http://websdr.ewi.utwente.nl:8901/ I entered the frequency of 60Khz and am curious to know if this the WWVB transmission I am hearing or something else? Donald Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Exact Time Mobile Phone Apps
I believe someone mentioned a cell phone "time" app. This is an image of the one I use for my iPhone. It is Emerald Sequoia. It queries correct time requests from four different NTP servers then picks the one with the least amount of response delay I believe. Of course when I'm out setting the clock on a Carillon system it has to be "just" right, doesn't it? I have uploaded a couple screen captures here: http://hammondorganservice.com/downloads/images/Emerald-Sequoia.jpg http://hammondorganservice.com/downloads/images/Emerald-Sequoia2.jpg A description of how it works is here: https://emeraldsequoia.com/et/index.html Don Resor N6KAW ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] WWVB Signal Generator
I thought I would search in a different way for a WWVB signal generator design. I found this item. While the designer explains it isn't as accurate as WWVB it may be another starting point. http://www.tauntek.com/wwvbgen-low-cost-wwvb-time-signal-generator.htm Donald R. Resor Jr. T. W. & T. C. Svc. Co. http://hammondorganservice.com Hammond USA warranty service "Most people don't have a sense of humor. They think they do, but they don't." --Jonathan Winters ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] NIST
I wonder if this will also have any effect on Time Service for Computers, Personal and Commercial. A lot of MS Windows products check for the correct time using time servers access from the internet. I'm sure this will also affect outdoor clock towers which also use this reference. Am I mistaken or is WWV the reference for all things dealing with the "time service"? Don Resor -Original Message- From: time-nuts On Behalf Of Dana Whitlow Sent: Saturday, August 11, 2018 7:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] NIST I fear the worst. The line in the website simply stated something like "shutting down the transmitters in Colorado and Hawaii", which would seem to include the whole enchilada. For the wall clocks, GPS should work well if people are willing to go to battery- backed AC power. But not so good for wristwatches, where the expectation is to run at uW power levels. I for one would be very irritated at having to take my watch off my wrist and put it on a charging stand every night. So if this shutdown comes to pass, I'll be looking for an inexpensive GPS-to-WWVB converter, or at least plans for building one. Dana ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
