Re: [time-nuts] And another Thunderbolt question

> Le 8 août 2017 à 17:53, Vlad a écrit : > > > Hello Netizens, > > After the power outage, my TB start to shows some strange behavior. Was it a normal power outage , or lightning strike ? Mine just went through a normal power outage without issue. > > As I start LH,

Re: [time-nuts] ***SPAM*** Tsunami detection via GPS

Hi you guys over the pond. Don’t be shy. Did anyone measure their oscillators stability over the eclipse totality? Please share. How about GPS? Did you record the crickets? Did the birds fly south? Did your excess milage increase global warning. Did the lights go out? Did anyone in your

Re: [time-nuts] GNSS Disciplined Clock

> Le 27 mai 2017 à 21:26, Ebrahim Roghanizad a écrit : > > Dear Chris > > As far as I know, atmospheric effect can not be compensated by looking at > satellites from all over the sky and averaging, since it does not have a > random nature, rather it introduces bias to

Re: [time-nuts] Next Aug 21 eclipse and time flow

To my mind there may be some effect due to small variations in gravity. The Chinese paper is very interesting and does propose classical explanations for the observed gravimeter anomalies. Even so , the variations that were detected by them should be detectable with a sufficiently stable clock.

Re: [time-nuts] GPS splitter

> Le 17 juin 2017 à 02:26, Tim Lister a écrit : > > On Fri, Jun 16, 2017 at 4:40 PM, Gregory Beat wrote: >> I have reached the point that I need a 4-port splitter for my GPS antenna >> (outdoor 5 volt). Any recommendations of models

Re: [time-nuts] ***SPAM*** Re: GPS discipline oscillator vs phase lock

> Le 17 juin 2017 à 07:55, Lifespeed via time-nuts a écrit > : > > Not too surprising to read locking two crystal oscillators together without > using a physical cable is difficult to impossible. Essentially what I am > looking for is the phase alignment accuracy (and

Re: [time-nuts] ***SPAM*** Re: GPS splitter

> Le 17 juin 2017 à 01:40, Gregory Beat a écrit : > > I have reached the point that I need a 4-port splitter for my GPS antenna > (outdoor 5 volt). Any recommendations of models (HP/Symmertricom/Microsemi) > to acquire OR to avoid?? > > greg > — I use Mini-Circuits

Re: [time-nuts] What's the magic recipe for setting the date on KS-24361

> Le 21 sept. 2017 à 06:30, Hal Murray a écrit : > > > I removed the antenna, power cycled, set the date, status looked good. > Then I reconnected the antenna. > After a while, if found some satellites and time jumped back to 1998. > > Did I miss a step? > > I used

Re: [time-nuts] ***SPAM*** PRS10 PRBB Shematics

> Le 7 oct. 2017 à 19:58, Mark Sims a écrit : > > SRS sells the connector. You might want to make sure you have a tube of > ass-lube handy when you check the price... It's around three times the > distribution price. SRS really should have used a standard D-sub and a

Re: [time-nuts] current crop of GPS receivers for Rpi/Beaglebone for NTP server/etc

> Le 16 oct. 2017 à 15:45, jimlux a écrit : > > I have beagles, but others have pis. > > There seem to be dozens of GPS receivers out there in a variety of form > factors. > > What's the current "best" inexpensive choice for run of the mill > time-setting/1pps that's

Re: [time-nuts] How do I compare GPS antennas?

> Le 6 sept. 2017 à 04:23, Hal Murray a écrit : > > Was > Subject: Re: [time-nuts] GPS Antenna Feed Line Decision > > kb...@n1k.org said: >> There is pretty much no experiment you could run that would show a >> difference between the two. With a normal GPS, the

Re: [time-nuts] GPS Antenna Feed Line Decision

> Le 5 sept. 2017 à 16:17, Bob kb8tq a écrit : > > Hi > > > >> On Sep 5, 2017, at 6:06 AM, Hal Murray wrote: >> >> >> Clay Autery said: >>> I will use something better than RG-59 or RG-6 (even if it is only "better" >>> in my

Re: [time-nuts] Very large X9.2 solar flare.

When I saw the OP I did a quick check of my GPS receivers status. One of them, a Jackson Labs M2M replacement (actually a U-blox M8T) had just reset and gone to a 111ms offset. Was that due to the CME? Was it one of Murphy’s laws « Looking for problems actually creates them » ? Or a result of

Re: [time-nuts] ***SPAM*** Looking For Z3801A Software

> Le 29 août 2017 à 19:05, Richard Solomon a écrit : > > I came across an HP Z3801A that I had not unpacked, been sitting > > in the box for 11 years !! > > > Plugged it in and in about 30 minutes it showed a GPS Lock !! > > > Now, the software I have so far found was

Re: [time-nuts] PRS10 PRBB Shematics

Hi Jacques, I’ve bought three of these PRBB for my PRS10s and got none of the information that you are interested in supplied by SRS. As you are asking for the Cannon connector used, I presume you don’t have one and maybe want to make one up? I have removed one and confirm that the Cannon

Re: [time-nuts] PRS10 PRBB Shematics

t; I searched Digikey for the canon connector but could not find it... they do > have the coax insert part number you listed. Are you aware of any other > source for the entire connector? > > Jerry, NY2KW > > -Original Message- > From: time-nuts [mailto:time-nuts-boun.

Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time

I have Win7-64 and my LH and system time are the same (with a very short delta of < 0.2s probably due to their respective window update time). I use the Meinberg disturb of NTP. My client’s offset from the paris observatory is less than a millisec. Maybe you should check your NTP status and see

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

On the home brew side there are GPS receivers (Ublox Lea 6T and Lea M8T) that will time tag incoming signals to sub usec resolution . You of course need a PC/micro to configure and read the data. Also, if you are prepared to have a Beaglebone Black in your box you can use one or both of the two

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

> Le 13 nov. 2017 à 01:29, Hal Murray a écrit : > > > apollo...@gmail.com said: >> prior to my senior project most geodetic surveyors used a Wooden boxed, >> marine chronometer, to get sub second UT1 time, or back then, GMT > > How did you get the data out of the

Re: [time-nuts] Deaf Z3801

> Le 15 nov. 2017 à 04:43, Bob Bownes a écrit : > > > I put my 3801 back in service the day before yesterday, or tried to. It’s > been on the shelf for about a year (off). > > I powered it up, and while it sees a few sats, it will not acquire any. > Changing to a known

Re: [time-nuts] H-maser drift

Thanks for that input John. > Le 21 nov. 2017 à 21:26, John Ponsonby a écrit : > . > 7. The RF discharge generates UV. This shines up the beam path and > illuminates the bulb coating in the region where the incoming atoms first > make contact with the bulb coating. This

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

> Le 15 déc. 2017 à 14:06, Attila Kinali a écrit : > > On Fri, 8 Dec 2017 09:40:29 -0800 > Tom McDermott wrote: > >> Researchers at Oxford U. have fabricated an atomic reference based on >> a single nitrogen molecule inside a 60-atom carbon sphere

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

> Le 13 nov. 2017 à 12:12, Hal Murray a écrit : > > > michael.c...@sfr.fr said: prior to my senior project most geodetic surveyors used a Wooden boxed, marine chronometer, to get sub second UT1 time, or back then, GMT > >>> How did you get the data out of

Re: [time-nuts] ***SPAM*** Re: Why discipline Rubidium oscillator?

> Le 20 nov. 2017 à 20:53, Dana Whitlow a écrit : > > > > In my pre-retirement job I rode herd on an active Hydrogen maser system,and > even > that has a clear drift tendency. Generally a couple or three times per > year I had to make a frequency adjustment in the

Re: [time-nuts] ***SPAM*** Re: Designing an embedded precision GPS time server

> Le 29 oct. 2017 à 11:29, Leo Bodnar a écrit : > > > If you are making an open source thing you might want to use Laureline NTP > http://partiallystapled.com/pages/laureline-gps-ntp-server.html as a starting > point or as a performance yardstick. I have never seen one

Re: [time-nuts] Designing an embedded precision GPS time server

> Le 29 oct. 2017 à 11:29, Leo Bodnar a écrit : > > If you are making an open source thing you might want to use Laureline NTP > http://partiallystapled.com/pages/laureline-gps-ntp-server.html as a starting > point or as a performance yardstick. I have never seen one so

Re: [time-nuts] On the IETF leap-seconds.list SHA1

> Le 21 déc. 2017 à 07:01, Anders Wallin a écrit : > >> >>> For the Paris Observatory and USNO files my program agrees with the SHA1s >>> in the files. >>> For the IETF file there seems to be one byte, a "0" at the start of the >>> third group of 8 hex characters

Re: [time-nuts] On the IETF leap-seconds.list SHA1

> Le 20 déc. 2017 à 12:51, Anders Wallin a écrit : > > Hi all, > So I'm doing the typical Wednesday thing you might do, that is writing a > small script for checking the SHA1 checksum in leap-seconds.list files. > I came up with [1] which produces output [2]. > >

Re: [time-nuts] Ultra low power RTC

> Le 7 mars 2018 à 11:10, Attila Kinali a écrit : > > On Tue, 6 Mar 2018 21:57:32 -0500 > Bob kb8tq wrote: > >> Assuming you are going to run it off a battery. What’s the self discharge >> rate on a reasonable battery? > > With supply currents below 100nA

Re: [time-nuts] PRS10 Information and help needed

Hi Arnold, It looks like your oscillator is locked to the rubidium and it is configured to lock to an incoming PPS sig, but the TT value is null, so maybe you have forgotten to connect the GPS? Or maybe to the wrong connector? Check the PPS in to see if you have a good signal. I don’t know

Re: [time-nuts] NEO-7 GPS default 1pps width?

I have 6M and 8M and they are both 100ms 1PPS signals. Interpolate. > Le 8 avr. 2018 à 15:51, jimlux a écrit : > > I've got some NEO-7Ms here, and without an oscilloscope handy - what's the > factory default 1pps pulse width? > > The manual says pulseLenRatio is zero

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

I have a Citizen A660 movement which was spec’d at +/- 5 secs per year. I monitored it from when I bought it in December 2010 until its battery failed on 03/11/2012. It was in spec when both on and off the wrist (off the wrist it was in a drawer at a constant temperature and the accuracy was a

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