Re: [ntp:questions] Slow convergence of NTP with GPS/PPS
On Sat, Oct 25, 2008 at 4:51 AM, David Woolley [EMAIL PROTECTED] wrote: Of course not ( and the GPS18 only gives 1us accuracy anyway) but the OP wanted accuracy to 1ms, which is trivial for both the computer and the gps. I think there have been reports that the 1 microsecond is actually a conservative figure. Wouldn't the serial port itself prevent anything better than ≈104 µs because of the commonly used 9600 baud rate on the serial line? Even at the max possible (according to Garmin) baud rate of 38400, 26 µs would seem to be the best possible. Or does the PPS signal not depend on the serial baud rate? I have just acquired a GPS18LVC and am starting to wade into configuring on FreeBSD, but I am not expecting anything better than 100 µs at 9600 baud. -- RPM ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow convergence of NTP with GPS/PPS
Ryan Malayter wrote: would seem to be the best possible. Or does the PPS signal not depend on the serial baud rate? PPS doesn't depend on the baud rate. Also, asynchronous interfaces generally sample at 16 times the baud rate, so a 9600 baud transmission could be resolved to 6.61 microseconds, even without PPS. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
[ntp:questions] How can it be :05 in one place and :30 in another place?
Hi, I went to http://www.timeanddate.com/worldclock/ I saw that it was 10:35 in New York but in Adelaide it was 1:05 PM and in New Delhi 8:05. How can that be? Gretchen ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] How can it be :05 in one place and :30 in another place?
Gretchen Baxter [EMAIL PROTECTED] wrote: Hi, I went to http://www.timeanddate.com/worldclock/ I saw that it was 10:35 in New York but in Adelaide it was 1:05 PM and in New Delhi 8:05. How can that be? Gretchen While most time zones differ from UTC by an integer number of hours, there are some that do not. See: http://www.worldtimezone.com/time/wtzstandard.php?sorttb=Citylistsw=forma=12h -- Jim Pennino Remove .spam.sux to reply. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] How can it be :05 in one place and :30 in another place?
Gretchen Baxter wrote: Hi, I went to http://www.timeanddate.com/worldclock/ I saw that it was 10:35 in New York but in Adelaide it was 1:05 PM and in New Delhi 8:05. How can that be? Gretchen http://www.timeanddate.com/library/abbreviations/timezones/ There are timezones with non integerhour offsets. uwe ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow convergence of NTP with GPS/PPS
[EMAIL PROTECTED] (Ryan Malayter) writes: On Sat, Oct 25, 2008 at 4:51 AM, David Woolley [EMAIL PROTECTED] wrote: Of course not ( and the GPS18 only gives 1us accuracy anyway) but the OP wanted accuracy to 1ms, which is trivial for both the computer and the gps. I think there have been reports that the 1 microsecond is actually a conservative figure. Wouldn't the serial port itself prevent anything better than b 104 B5s because of the commonly used 9600 baud rate on the serial line? Even at the max possible (according to Garmin) baud rate of 38400, 26 B5s would seem to be the best possible. Or does the PPS signal not depend on the serial baud rate? The PPS is on a separate line. It is NOT on the serial port. I have just acquired a GPS18LVC and am starting to wade into configuring on FreeBSD, but I am not expecting anything better than 100 B5s at 9600 baud. That may be what you expect, but you can get it 1usec (1 micro second). ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] How can it be :05 in one place and :30 in another place?
[EMAIL PROTECTED] (Gretchen Baxter) writes: Hi, I went to http://www.timeanddate.com/worldclock/ I saw that it was 10:35 in New York but in Adelaide it was 1:05 PM and in New Delhi 8:05. How can that be? Easy. There exist half hour time zones in the world. The closest to you is probably Newfoundland in Canada. Gretchen ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Slow convergence of NTP with GPS/PPS
Ryan Malayter [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] [...] Or does the PPS signal not depend on the serial baud rate? It's generally rigged to trigger an interrupt in the receiving machine. Groetjes, Maarten Wiltink ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
[ntp:questions] list posts in UTF-8
On Sun, Oct 26, 2008 at 2:48 PM, Unruh [EMAIL PROTECTED] wrote: That may be what you expect, but you can get it 1usec (1 micro second). Is there something wrong with the mail gateway and Unicode? I posted my message as text/plain with charset=UTF-8, which has been an IETF standard for more than a decade. And my message does, in fact, appear correct with UTF-8 characters such as μ (Greek Small Letter Mu, Unicode 03BC) in the list archives at: https://lists.ntp.org/pipermail/questions/2008-October/020235.html However, all replies to my message were in 7-bit charset=us-ascii, which of course mangles the non-ASCII chasracters. So is it the pipermail gateway that is not Unicode compliant, or is it the MUAs of the respondents that is at fault? If it is the list itself... well, isn't it absurd to restrict content of a mailing list to 7-bit us-ascii? It is 2008, not 1988. Regards, -- RPM ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] list posts in UTF-8
Ryan Malayter [EMAIL PROTECTED] wrote: On Sun, Oct 26, 2008 at 2:48 PM, Unruh [EMAIL PROTECTED] wrote: That may be what you expect, but you can get it 1usec (1 micro second). Is there something wrong with the mail gateway and Unicode? I posted my message as text/plain with charset=UTF-8, which has been an IETF standard for more than a decade. And my message does, in fact, appear correct with UTF-8 characters such as l (Greek Small Letter Mu, Unicode 03BC) in the list archives at: https://lists.ntp.org/pipermail/questions/2008-October/020235.html However, all replies to my message were in 7-bit charset=us-ascii, which of course mangles the non-ASCII chasracters. So is it the pipermail gateway that is not Unicode compliant, or is it the MUAs of the respondents that is at fault? If it is the list itself... well, isn't it absurd to restrict content of a mailing list to 7-bit us-ascii? It is 2008, not 1988. Regards, This is usenet, not a mailing list. -- Jim Pennino Remove .spam.sux to reply. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] list posts in UTF-8
[EMAIL PROTECTED] wrote: Ryan Malayter [EMAIL PROTECTED] wrote: On Sun, Oct 26, 2008 at 2:48 PM, Unruh [EMAIL PROTECTED] wrote: That may be what you expect, but you can get it 1usec (1 micro second). Is there something wrong with the mail gateway and Unicode? I posted my message as text/plain with charset=UTF-8, which has been an IETF standard for more than a decade. And my message does, in fact, appear correct with UTF-8 characters such as l (Greek Small Letter Mu, Unicode 03BC) in the list archives at: https://lists.ntp.org/pipermail/questions/2008-October/020235.html However, all replies to my message were in 7-bit charset=us-ascii, which of course mangles the non-ASCII chasracters. So is it the pipermail gateway that is not Unicode compliant, or is it the MUAs of the respondents that is at fault? If it is the list itself... well, isn't it absurd to restrict content of a mailing list to 7-bit us-ascii? It is 2008, not 1988. Regards, This is usenet, not a mailing list. There IS a mailing list for those who prefer mail to news or for those who don't have access to news. Comcast has announced that it will no longer offer access to net news effective 28 October 2008. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] list posts in UTF-8
Richard B. Gilbert [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Ryan Malayter [EMAIL PROTECTED] wrote: On Sun, Oct 26, 2008 at 2:48 PM, Unruh [EMAIL PROTECTED] wrote: That may be what you expect, but you can get it 1usec (1 micro second). Is there something wrong with the mail gateway and Unicode? I posted my message as text/plain with charset=UTF-8, which has been an IETF standard for more than a decade. And my message does, in fact, appear correct with UTF-8 characters such as l (Greek Small Letter Mu, Unicode 03BC) in the list archives at: https://lists.ntp.org/pipermail/questions/2008-October/020235.html However, all replies to my message were in 7-bit charset=us-ascii, which of course mangles the non-ASCII chasracters. So is it the pipermail gateway that is not Unicode compliant, or is it the MUAs of the respondents that is at fault? If it is the list itself... well, isn't it absurd to restrict content of a mailing list to 7-bit us-ascii? It is 2008, not 1988. Regards, This is usenet, not a mailing list. There IS a mailing list for those who prefer mail to news or for those who don't have access to news. Comcast has announced that it will no longer offer access to net news effective 28 October 2008. Yeah, there are lots of groups with a mail gateway. That doesn't change the fact the base is a usenet news group. -- Jim Pennino Remove .spam.sux to reply. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
