Re: [ntp:questions] Purpose of a leap second file?

2012-03-03 Thread David E. Ross
On 3/3/12 1:13 PM, John Hasler wrote: > David E. Ross writes: >> Why require a UTC adjustment from TAI? If the data represent a >> satellite orbiting the earth and the sub-satellite point on the >> earth's surface is needed, the TAI is converted to UTC, which is then >> converted through UT2 to UT

[ntp:questions] semi OT - interesting page related to timing

2012-03-03 Thread Ron Frazier (NTP)
HI all, Doing some more late night research. While not NTP specific, this page has some cool info related to timing, some neat FAQ's, and lots of neat links. http://www.ko4bb.com/Timing/ Sincerely, Ron -- (PS - If you email me and don't get a quick response, don't be concerned. I get ab

[ntp:questions] earn money

2012-03-03 Thread Mousumi Mondal
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Re: [ntp:questions] Purpose of a leap second file?

2012-03-03 Thread unruh
On 2012-03-03, David E. Ross wrote: > On 2/15/12 10:22 PM, A C wrote: >> Given the recent thread here about the upcoming leap second, I wanted to >> know what additional service/value the leap second file provides that >> isn't handled by ntpd receiving a message to add or remove a second. I >

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread unruh
On 2012-03-03, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote: > unruh wrote: >> On 2012-03-03, Terje Mathisen<"terje.mathisen at tmsw.no"> wrote: >>> The idea is of course to NOT use the USB-RS232 emulation driver, instead >>> (or on top of) you want a private command to poll for the latest P

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread Michael Deutschmann
On Sat, 3 Mar 2012, Terje Mathisen wrote: > ESR was asking for a purpose-built USB GPS unit, it would obviously have > some kind of embedded cpu to handle the USB stack and the differential > timing between the gps chipset sending a PPS and host cpu sending a USB > poll. Actually, no. ESR wants s

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread Terje Mathisen
unruh wrote: On 2012-03-03, Terje Mathisen<"terje.mathisen at tmsw.no"> wrote: The idea is of course to NOT use the USB-RS232 emulation driver, instead (or on top of) you want a private command to poll for the latest PPS timestamp. The PPS does not send a timestamp. The PPS is such that the r

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread A C
On 3/3/2012 14:08, Michael Deutschmann wrote: Although that brings up one other idea -- a wireless GPS clock. That would be basically a relay that listens for long-range-line-of-sight signals, and then synthesizes a short-range-building-piercing signal for its owner to use. Only a simple pulse

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread Michael Deutschmann
On Sat, 3 Mar 2012, Chris Albertson wrote: > On Fri, Mar 2, 2012 at 4:03 PM, Michael Deutschmann > > (Not my dream though.  If I was to go to the trouble of installing a box > > outside my home and routing a cable through the wall to my computers, > > I'd like some weather sensors in the deal as we

Re: [ntp:questions] Purpose of a leap second file?

2012-03-03 Thread John Hasler
David E. Ross writes: > Why require a UTC adjustment from TAI? If the data represent a > satellite orbiting the earth and the sub-satellite point on the > earth's surface is needed, the TAI is converted to UTC, which is then > converted through UT2 to UT1 and possibly to UT0 before obtaining the >

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread unruh
On 2012-03-03, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote: > unruh wrote: >> On 2012-03-03, Terje Mathisen<"terje.mathisen at tmsw.no"> wrote: >>> I.e. even if regular USB is limited to 1 ms resolution, it should be >>> possible to improve this to a sub-us timestamp with such a protocol. >

Re: [ntp:questions] Purpose of a leap second file?

2012-03-03 Thread David E. Ross
On 2/15/12 10:22 PM, A C wrote: > Given the recent thread here about the upcoming leap second, I wanted to > know what additional service/value the leap second file provides that > isn't handled by ntpd receiving a message to add or remove a second. I > understand the generic ntpd documentation

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread Terje Mathisen
unruh wrote: On 2012-03-03, Terje Mathisen<"terje.mathisen at tmsw.no"> wrote: I.e. even if regular USB is limited to 1 ms resolution, it should be possible to improve this to a sub-us timestamp with such a protocol. ?? How does anything know what the offset is between the time the GPS emits

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread unruh
On 2012-03-03, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote: > Michael Deutschmann wrote: >> It's silly of him to ask only on his blog and not here, since many here >> would want the same thing. The only difference between what he wants >> and the NTP hobbyist's dream is that he requires a U

Re: [ntp:questions] ESR looking for good GPS clocks

2012-03-03 Thread Terje Mathisen
Michael Deutschmann wrote: It's silly of him to ask only on his blog and not here, since many here would want the same thing. The only difference between what he wants and the NTP hobbyist's dream is that he requires a USB interface. An NTP hobbyist would prefer raw RS-232 to cut conversion ove

Re: [ntp:questions] semi OT - GPS receiver for BMW automobile on EBay

2012-03-03 Thread Mark C. Stephens
Un-Oh Ron is bored again.. ;) > We could make a chant - TI MING ... TI MING ... TI MING. The box just ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions