Re: [time-nuts] 1PPS for the beginner

Thank you Bert   In a message dated 8/17/2018 7:20:40 AM Eastern Standard Time, azelio.bori...@gmail.com writes:   Direct link to the TOW time 2017: On Fri, Aug 17, 2018 at 12:41 PM ew via time-nuts wrote: > > Tom > go back many times to the

Re: [time-nuts] 1PPS for the beginner

Direct link to the TOW time 2017: On Fri, Aug 17, 2018 at 12:41 PM ew via time-nuts wrote: > > Tom > go back many times to the two editions I have. Very informative. Tried the > link no luck. Are there updated editions? > Thanks again > Bert

Re: [time-nuts] 1PPS for the beginner

Tom go back many times to the two editions I have. Very informative. Tried the link no luck. Are there updated editions? Thanks again Bert Kehren   In a message dated 8/17/2018 5:29:40 AM Eastern Standard Time, tom.k...@gmail.com writes:   Dana (and others) -- Concerning 1PPS, hanging bridges

Re: [time-nuts] 1PPS for the beginner

Dana (and others) -- Concerning 1PPS, hanging bridges & such items, you might want to look at the Timing/VLBI papers that Rick Hambly & I have produced over the years and which we have archived on https://GPSTime.com . The Sawtooth & Hanging Bridges effects are described in excruciating

Re: [time-nuts] 1PPS for the beginner

> On 15 Aug 2018, at 14:46, Poul-Henning Kamp wrote: > > > In message > , Peter > Vince writes: > >> I was astonished to see the pulse-width in the document defined from the >> base of the (sharp-cornered!) edges, and not the mid-point - totally >> impractical! > > Given that the

Re: [time-nuts] 1PPS for the beginner

I was astonished to see the pulse-width in the document defined from the base of the (sharp-cornered!) edges, and not the mid-point - totally impractical! Near the top of the previous page it says: "If required for testing purposes, the pulse width at the 50% level may be determined by

Re: [time-nuts] 1PPS for the beginner

Hi Bernd, One reference to 20us 1PPS pulse length is the ICD-GPS-060, see figure 3-2, page 3-3 (pdf page 19) https://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf Group - Are there other standard documents defining duty-cycle, voltage levels, rise times etc? MfG Björn > On 14 Aug

Re: [time-nuts] 1PPS for the beginner

On Tue, August 14, 2018 3:56 pm, ed breya wrote: > Then I wondered about what would happen if the > GPS receiver's internal clock, instead of > being from a drifty TCXO, was synchronized and "perfect," The Trimble Thunderbolt works that way. A very good GPDSO. You need access to the GPS

Re: [time-nuts] 1PPS for the beginner

- From: "Bernd Neubig" To: "'Discussion of precise time and frequency measurement'" Sent: Tuesday, August 14, 2018 11:52 AM Subject: Re: [time-nuts] 1PPS for the beginner > Another question, a bit off the road of this thread: > Is there any common practice for t

Re: [time-nuts] 1PPS for the beginner

nuts-boun...@lists.febo.com] Im Auftrag von > Bob kb8tq > Gesendet: Dienstag, 14. August 2018 17:05 > An: Discussion of precise time and frequency measurement < > time-nuts@lists.febo.com> > Betreff: Re: [time-nuts] 1PPS for the beginner > > Hi > > > > On Au

Re: [time-nuts] 1PPS for the beginner

> Is there a time-nuts FAQ? Hi Ron, We've considered that several times. There are problems. Also it's hard to beat the already superb NIST Time & Frequency FAQ / A-Z glossary. There's an index, or just start with A and read through several dozen webs pages until you get to Z:

Re: [time-nuts] 1PPS for the beginner

On 8/14/18 8:13 AM, Poul-Henning Kamp wrote: In message <20180814143354.ga29...@panix.com>, Ron Bean writes: Is there a time-nuts FAQ? Every so often somebody proposes a time-nuts wiki, then somebody tries to read the manual page for the mediawiki software and the idea dies again

Re: [time-nuts] 1PPS for the beginner

Thanks Bob and Azello. Now I understand the terminology and also better the mechanism for the sawtooth error. I once read that the LO, at least, in some GPS receivers, was not even crystal controlled but was rather a ring oscillator based on a string of cascaded logic inverters on the chip.

Re: [time-nuts] 1PPS for the beginner

In message , Dana Whitlow writes: > Could someone please define and explain the term 'hanging bridge' in this > context? Look first at this illustrative plot from Toms site: http://www.leapsecond.com/pages/m12/1phase8.gif The situation is the following: The gps receiver

Re: [time-nuts] 1PPS for the beginner

Hi A normal GPS module generates it’s outputs off of a free running internal clock. Generally this is a TCXO in a “timing” GPS ( = one that puts out a rational PPS). This is a bit counter intuitive, since you would *think* they phase lock the local source in the module. They don’t mainly

Re: [time-nuts] 1PPS for the beginner

For a definition of hanging bridge in the GPS receiver's context see: On Tue, Aug 14, 2018 at 2:58 PM jimlux wrote: > > On 8/14/18 12:29 AM, Mike Cook wrote: > > >> Le 14 août 2018 à 04:29, Chris Caudle a écrit : > >> > >> On Mon, August 13,

Re: [time-nuts] 1PPS for the beginner

Could someone please define and explain the term 'hanging bridge' in this context? Thanks, Dana On Tue, Aug 14, 2018 at 7:02 AM, Azelio Boriani wrote: > Hanging bridges out of a GPSDO's PPS? Interesting... time to try to > setup a measurement and see the relation between the GPS's PPS

Re: [time-nuts] 1PPS for the beginner

Hanging bridges out of a GPSDO's PPS? Interesting... time to try to setup a measurement and see the relation between the GPS's PPS hanging bridges and the corresponding DO's ones. On Tue, Aug 14, 2018 at 9:55 AM Mike Cook wrote: > > > > Le 14 août 2018 à 09:29, Mike Cook a écrit : > > > > Sorry

Re: [time-nuts] 1PPS for the beginner

> Le 14 août 2018 à 09:29, Mike Cook a écrit : > > Sorry about the previous blank mail. Finger jitter. > > > >> Le 14 août 2018 à 04:29, Chris Caudle a écrit : >> >> On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: >>> I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+

Re: [time-nuts] 1PPS for the beginner

In message , Mike Cook writes: > I don’t think that you are buying much with disciplining the PRS10 > with a GPSDO 1PPS. Do you have any TIC measurements in this config > to compare with a direct GPS 1PPS feed? There is a large footnote about "hanging bridges" here. If you feed the

Re: [time-nuts] 1PPS for the beginner

Sorry about the previous blank mail. Finger jitter. > Le 14 août 2018 à 04:29, Chris Caudle a écrit : > > On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: >> I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO >> that I am using to steer a PRS10 RFS. I'm a little

Re: [time-nuts] 1PPS for the beginner

> Le 14 août 2018 à 04:29, Chris Caudle a écrit : > > On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: >> I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO >> that I am using to steer a PRS10 RFS. I'm a little confused on where the >> 1PPS is coming from with respect

Re: [time-nuts] 1PPS for the beginner

On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: > I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO > that I am using to steer a PRS10 RFS. I'm a little confused on where the > 1PPS is coming from with respect to the GPSDO. A GPS disciplined oscillator contains a GPS

[time-nuts] 1PPS for the beginner

Hello members, At the risk of personal embarrassment and perhaps a chuckle, or two, I'm going to ask the following questions about 1PPS. I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO that I am using to steer a PRS10 RFS. I'm a little confused on where the 1PPS is