Re: [ntp:questions] A Christmas puzzler - intermittent offset oscillations with a PPS source

2012-12-21 Thread A C
On 12/21/2012 19:38, Mischanko, Edward T wrote: -Original Message- From: questions- bounces+edward.mischanko=arcelormittal@lists.ntp.org [mailto:questions- bounces+edward.mischanko=arcelormittal@lists.ntp.org] On Behalf Of A C Sent: Friday, December 21, 2012 3:56 PM To: question

Re: [ntp:questions] A Christmas puzzler - intermittent offset oscillations with a PPS source

2012-12-21 Thread Mischanko, Edward T
> -Original Message- > From: questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org > [mailto:questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org] On > Behalf Of A C > Sent: Friday, December 21, 2012 3:56 PM > To: questions@lists.ntp.org > Subject: Re: [ntp

Re: [ntp:questions] Clock Offset

2012-12-21 Thread Mischanko, Edward T
> -Original Message- > From: questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org > [mailto:questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org] On > Behalf Of E-Mail Sent to this address will be added to the > BlackLists > Sent: Thursday, December 20, 2

Re: [ntp:questions] Clock Offset

2012-12-21 Thread Mischanko, Edward T
> -Original Message- > From: questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org > [mailto:questions- > bounces+edward.mischanko=arcelormittal@lists.ntp.org] On > Behalf Of David Woolley > Sent: Thursday, December 20, 2012 2:05 AM > To: questions@lists.ntp.org > Subje

Re: [ntp:questions] A Christmas puzzler - intermittent offset oscillations with a PPS source

2012-12-21 Thread A C
On 12/21/2012 11:51, Rick Jones wrote: David Taylor wrote: Although the offset appears to have a 1.25 hour period from the MRTG graphs, examining the loopstats directly shows that the actual period is just over about 5/3 minutes - just over 100 seconds. I don't know what's happening. I would

Re: [ntp:questions] A Christmas puzzler - intermittent offset oscillations with a PPS source

2012-12-21 Thread Rick Jones
David Taylor wrote: > Although the offset appears to have a 1.25 hour period from the MRTG > graphs, examining the loopstats directly shows that the actual > period is just over about 5/3 minutes - just over 100 seconds. I > don't know what's happening. I would have put it down to poor GPS > str

[ntp:questions] A Christmas puzzler - intermittent offset oscillations with a PPS source

2012-12-21 Thread David Taylor
I have two Raspberry Pi card computers both synced to GPS/PPS sources. #1 is using a u-blox 6M "navigation" GPS, and #2 a Trimble resolution SMT "timing" GPS. Every now and then (perhaps one day on ten?), the "navigation" synced device develops spikes in the offset of about 8 microseconds in d