[time-nuts] Used ESE ES-911/GPS/NTP Master Time Clock Power Supply
The Triad VPS12-2000 transformer seems to be the best readily available alternative to the original wall-wart power supply so far for the ESE ES-911/GPS/NTP. The two 6 volt windings can be strapped in parallel to provide 4 amps. It won't fit within the 1U case so some sort of external enclosure is necessary. While the ES-911 will operate on a 6 volt 2 amp wall-wart and the internal 5 volt rail is within spec, the other voltages are low. With the Triad unit, the internal battery now floats at 6.8 volts, a more reasonable value. Under load, the Triad puts out 7.1 volts AC, the same as the no-load output of the 2 amp wall-wart previously used. This information may be of some use to others who obtain an ESE ES-911/GPS/NTP or similar unit that is missing the external AC power supply. KE6CD ___ 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] HP5065A on ebay
OK, that makes sense. Maybe they had responsibility for keeping all their state’s radio gear tuned up and on frequency. On Wed, Jan 1, 2020 at 2:42 PM jimlux wrote: > On 1/1/20 1:27 PM, Jeremy Nichols wrote: > > Wonder why a highway department would have a rubidium standard? > > I'm not sure about one like that, but a frequency standard in the radio > shop wouldn't be surprising for checking radio frequencies, calibrating > electronic distance measuring equipment, etc. > > Of course, today, they'd buy a SR725 or some GPSDO. > > > And it might well have been purchased by the ebay vendor as part of a > lot of surplus gear sold essentially by the pound/ton. > > (of course, the seller has only been on ebay for a few months) > > > > > > > > On Wed, Jan 1, 2020 at 8:18 AM ew via time-nuts < > time-nuts@lists.febo.com> > > wrote: > > > >> There is a HP5065A with date code 28 on ebay looks like new 12 hours to > go > >> > >> Bert Kehren > >> ___ > >> 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. > -- Jeremy Nichols Sent from my iPad 6. ___ 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] HP5065A on ebay
Wonder why a highway department would have a rubidium standard? On Wed, Jan 1, 2020 at 8:18 AM ew via time-nuts wrote: > There is a HP5065A with date code 28 on ebay looks like new 12 hours to go > > Bert Kehren > ___ > 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. > -- Jeremy Nichols Sent from my iPad 6. ___ 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] PLL suggestions
Hi Dan, This is possible with the Broadcom BCM54210SE or BCM54220SE. Ethernet PHY with built in jitter cleaner. External loop filter, 10MHz input is possible, 125MHz output locked to 10MHz is possible but not documented. The Ethernet PHYs will also be locked to the 10MHz input and it has HW 1 step 1588 support I was one of the designers of this part email me off list if you need more info. Jay On Tuesday, December 31, 2019, 10:15:26 AM CST, Dan Kemppainen wrote: Hi All, We've got a project going on where we need a 125MHz clock that should be locked to 10MHz. I'm considering an on board 10MHz oscillator and external 10MHz input to utilize an external standard to lock the 125MHz which would PLL a 125MHz source. The 125MHz becomes a reference for 3.125Ghz, as well as logic running at 125Mhz. (Currently this system is running on small 125MHz TCXO.) Basically we need a reasonably clean 125MHz signal, but locked to 10Mhz for frequency reference. We've identified a few VCXO's that seem to be low noise and are small enough. The 10Mhz is easy enough. However my stumbling block is a simple PLL. What I'm looking for is a simple, small PLL chip. Something with external analog loop filter components to allow easy tweaking would be preferred. In my perfect world, this chip would be a COTS part, with pin strappable divider configuration or similarly simple hardware configuration. An OTP device would work as well, as would one with it's own memory and external programmer. If necessary a small PIC or similar could be used to configure the PLL, but that's one chip which would be nice to avoid. Smaller compact package SMT parts are fine. This is going on a board with lots of SMT components, leadless flat pack devices and BGA's, so smaller is better. If any of you have any suggestions, I'd appreciate it. Happy new year! Dan ___ 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.
Re: [time-nuts] PLL suggestions
Hi ... SOIC-8 is an 8 pin rather than a 6 pin package :) Bob > On Jan 1, 2020, at 8:54 AM, Graham / KE9H wrote: > > On Tue, Dec 31, 2019 at 9:38 PM Bob kb8tq wrote: > >> Hi >> >> The gotcha with a 6 pin package is that it is unlikely to have a (4 pin) >> SPI interface. >> Pretty much every PLL chip in the universe is SPI. >> >> Bob >> >> > Bob: > > I think things are more powerful than you think. > > For example, check out a PIC16F18313, 8 pin SOIC-8. > 6 I-O pins, mappable through a pin-mux. > Includes ADC, DAC, 3 Timers, UART, I2C, SPI, 2 blocks of user configurable > logic, and an on board CPU master clock good to 1 % over temp and voltage. > > $0.75 in quantity 1 ! > > So, all of that for less than a 555 timer IC. > > You don't have enough pins to get at everything simultaneously, but no > problem configuring a PLL over a SPI. > > --- Graham > ___ > 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] HP5065A on ebay
There is a HP5065A with date code 28 on ebay looks like new 12 hours to go Bert Kehren ___ 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] Happy New Maser Lock
Fellow time-nuts, On friday I took the delivery of the EFOS10 maser, and this morning it got temperature of cavity up to support masing, which is really for it to be sufficiently in tune frequency wise, and then 2 min later the 5 MHz BVA had achieved lock on the signal. The cavity temperature have stabilized and it outputs a strong and healthy masing signal. A quick and dirty frequency check that was setup with a OSA 3210 cesium and then having the 53132A measure 5 MHz output of the EFOS10, also indicate lock, as it was nicely on 5 MHz sharp, flipping around the mark as expected. I will setup a more serious measurement setup. The EFOS10 has a bit of history and I have a lot of documents and log books to tracks it's history. It's interesting to see how careful it has been maintained, measured, adjusted etc. and this is valuable information now as I compare it to older behavior. As one notice the changes, as it was built in 1990-1991, went through acceptance tests and later got placed at the VLBI station on Pico Veleta (2850 m up in south of Spain) as operated by IRAM. After it had failed its lock on 27 Dec 2018, decision came to decommission it. Ole helped me to locate it through T4Science, and I bought it from IRAM, then had T4Science commissioned to pick it up and transport it to T4Science in Neuchatel. There it was concluded that the palladium valve had failed, so it was replaced. The palladium valve is responsible for being the controlled leak of H2 from the H2 tube, and when it fails it fails in open state, so it emptied the H2 bottle in advance. It also seems like one of the ion pumps failed, and luckily a spare ion pump was included as I bought the maser, so that got into use directly. Hydrogen masers is quite a different beast than cesium beams, it's a much more serviceable system, but it also takes quite a bit of equipment to service it. So, if I where to replace an ion-pump, I would need to have a vacuum pump and a few things to interconnect. Also, to start the new ion-pump one needs a special power-supply, which luckily was included in the buy. Did I say that it has an internal and external vacuum system? The internal is to evacuate from the maser-bulb. Another thing is that these beasts have many temperature control systems. A lot of things to monitor, and thanks to Ole I have logging of all the state every 10s. Anyway, I ended up having T4Science commissioned to transport it up, and Sylvère had his son Laurel and his girlfriend Joana drive it up here. Very good people. We had a nice evening after the quite heavy job of getting it in the door. So, I end up being happy with such a good start to the new year. Good things achieved, many new to work on now that the maser is running. Many thanks goes out to Ole Petter Rønningen and Sylvère Froidevaux at T4Science, as well as to Laurel and Joana naturally. Additional people at T4Science and IRAM to be thanked also! Happy New Year and Happy New Maser Lock! Magnus ___ 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] PLL suggestions
Even with a smaller device it's possible : you can sometimes repurpose crystal and reset pins to be I/O, do a software SPI, and set registers using write-only methods (MOSI but no MISO connection) to get down to 2 or 3 pins used. On Wed, Jan 1, 2020 at 1:54 PM Graham / KE9H wrote: > On Tue, Dec 31, 2019 at 9:38 PM Bob kb8tq wrote: > > > Hi > > > > The gotcha with a 6 pin package is that it is unlikely to have a (4 pin) > > SPI interface. > > Pretty much every PLL chip in the universe is SPI. > > > > Bob > > > > > Bob: > > I think things are more powerful than you think. > > For example, check out a PIC16F18313, 8 pin SOIC-8. > 6 I-O pins, mappable through a pin-mux. > Includes ADC, DAC, 3 Timers, UART, I2C, SPI, 2 blocks of user configurable > logic, and an on board CPU master clock good to 1 % over temp and voltage. > > $0.75 in quantity 1 ! > > So, all of that for less than a 555 timer IC. > > You don't have enough pins to get at everything simultaneously, but no > problem configuring a PLL over a SPI. > > --- Graham > ___ > 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.
Re: [time-nuts] PLL suggestions
On Tue, Dec 31, 2019 at 9:38 PM Bob kb8tq wrote: > Hi > > The gotcha with a 6 pin package is that it is unlikely to have a (4 pin) > SPI interface. > Pretty much every PLL chip in the universe is SPI. > > Bob > > Bob: I think things are more powerful than you think. For example, check out a PIC16F18313, 8 pin SOIC-8. 6 I-O pins, mappable through a pin-mux. Includes ADC, DAC, 3 Timers, UART, I2C, SPI, 2 blocks of user configurable logic, and an on board CPU master clock good to 1 % over temp and voltage. $0.75 in quantity 1 ! So, all of that for less than a 555 timer IC. You don't have enough pins to get at everything simultaneously, but no problem configuring a PLL over a SPI. --- Graham ___ 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 moderation, STATUS, January 2020
List -- Welcome to 2020, the 20th year of time-nuts! A few comments... (1) moderation You may have noticed that we recently turned off time-nuts list 'moderation'. We do this now and then. It means postings now immediately go to the entire group and archives without human review or delay [1]. So be extra careful about what you post, and also to whom, and how often. When the list is 'open' like this you may see an increase in posting mistakes, such as html mix-ups, suspect URLs, private email sent to a public list, off-topic postings, blank postings, duplicate postings, or admin questions. (2) reply-to In recent years we have seen issues with how some email clients handle replies. Before you hit 'send', double check the To: and Cc: lines to make sure there is only one recipient. That recipient should be 'time-nuts@lists.febo.com'. Any other combination of addresses is likely a mistake. If you do intend to reply to just one person in private, make sure their personal email address is in the To: line. Watch out for names like "John Doe via time-nuts". That's a pseudo name that expands to the entire mailing list; it is not actually their personal email address. (3) signal-to-noise-ratio As always on time-nuts, good questions *specifically related to precise time & frequency* are always welcome, especially from newcomers [2]. The list works best when replies are based on one's solid experience or links to technical articles or actual experimentation, rather than guesses or quick off-the-cuff comments. The list breaks down when threads veer off-topic, or when time-nuts acts like social media, or when the sheer volume of postings pushes people away. Please do your part to keep the SNR very high on this list. List administrative questions or comments should go directly to John (j...@febo.com) or Tom (t...@leapsecond.com) rather than to the entire 1800-member list. Thanks, /tvb [1] Some postings are still temporarily held for manual review: attachments over 1 MB (to prevent big mistakes), first-time posters (to detect spam), or members with persistent off-topic or email client issues. [2] An introduction to time-nuts and helpful T links: http://leapsecond.com/time-nuts.htm ___ 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] PC Time Servers
Richard, Faros uses a precise time of day to determine the time it took for the beacon signal to reach your location. It uses this info to determine if the path was the short path, or the long path. The NCDXF beacons use a GPS receiver to determine a very accurate time of day, and to start their transmission at a precise time. Faros looks at the clock time when it hears the signal arriving at the receiver it’s listening with. It knows the exact location of the transmitter and your exact location. Form there, it can calculate the spherical distance, both the “short path” and the “long path”. With the distance known, and the delay in receiving the signal, Faros can then determine if the signal arrived at your location via the short path, or the long path (or both!). Faros gets the correct time of day, by using it’s own built in NTP. It has a list of NTP servers, and it uses the NTP algorithm to determine the “delay” to that server. Faros ranks the quality of the NTP servers by delay. An interesting experiment is to tell Faros a location that’s much different than where it’s receive really is located. KR Kevin, From that I would expect the receiver & PC to have a good sub-millisecond accuracy, and the best way to achieve that would be to run the whole lot on Linux, to be honest! Given that it's Windows software: - ensure you're running Windows-10 as it has more precise time functions. - ask the developer to check for and use the "GetSystemTimePreciseAsFileTime" function to take advantage of the increased precision. - use a GPS with a PPS feed and ideally a PC with a real COM port, or at least a 3rd-party COM port. NOT a COM port over USB! - install the reference version of NTP (which includes PPS support for Windows). It does a lot more than a simple NTP client will do. I have some notes to help configure here: https://www.satsignal.eu/ntp/Sure-GPS.htm That's using a board which is no longer available, but a cheap Chinese GPS board with PPS output will suffice, possible needing a TTL to RS-232 level converter. Search that page for "loopback-ppsapi-provider.dll" as the original method of replacing the serial port driver no longer works under the current Windows-10. - leave the PC 24x7 on at as near constant temperature you can get. Have fun! Cheers, David -- SatSignal Software - Quality software for you Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk Twitter: @gm8arv ___ 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.
