Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-15 Thread SAIDJACK
HI Tom, got it. I was wondering because there is a 10MHz OCXO in the block diagram as well. bye, Said ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread Ulrich Bangert
and frequency measurement Betreff: Re: [time-nuts] Best GPS 1PPS Accuracy Ulrich, +-3 sigma is 99% on a gaussian distribution. If you want to look at other algorithms on this topic, here is one: http://www.control.isy.liu.se/books/adfilt/ br, Björn On Thu, December 14, 2006 12:55

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread bg
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hal Murray Sent: Thursday, December 14, 2006 2:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Best

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread SAIDJACK
In a message dated 12/14/2006 12:00:36 Pacific Standard Time, [EMAIL PROTECTED] writes: Hello Said, from my own experience in detecting and removal of outliers i can asure you that it is a challenging and ambitious task in statistical math. I fear you expect too much from a receiver's

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread Randy Warner
Said, Based on what I have read from the Motorola side of things setting the limits down that low will be problematic due to the constant threat of spurious alarms. My concern would be that the good 1PPS time accuracies might suffer if the receiver is constantly cycling. If the software filters

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread Brian Kirby
I use TAC32 Plus with my Motorola M12+ receiver. You can set TRAIM between 250 to 1000 nanoseconds. Default is 500 nS. I have had mine set at 250 nS for years and have not noticed any problems - but, that is a somewhat wide window. Brian N4FMN Randy Warner wrote: Said, Based on what I

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread Randy Warner
: Re: [time-nuts] Best GPS 1PPS Accuracy I use TAC32 Plus with my Motorola M12+ receiver. You can set TRAIM between 250 to 1000 nanoseconds. Default is 500 nS. I have had mine set at 250 nS for years and have not noticed any problems - but, that is a somewhat wide window. Brian N4FMN Randy Warner

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread SAIDJACK
Hi Randy, I will do a longer-term test with +-50ns setting. That should be interesting :) bye, Said ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread SAIDJACK
In a message dated 12/14/2006 16:46:10 Pacific Standard /tvb writes: The beauty of a GPSDO is that you're only changing the DAC every few minutes so there's plenty of time to look carefully at the quality of your 1 Hz samples before you commit the DAC update. It would be a more

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-14 Thread Tom Van Baak
: Re: [time-nuts] Best GPS 1PPS Accuracy In a message dated 12/14/2006 16:46:10 Pacific Standard /tvb writes: The beauty of a GPSDO is that you're only changing the DAC every few minutes so there's plenty of time to look carefully at the quality of your 1 Hz samples before you

[time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread Jack Hudler
Can someone explain the accuracy numbers that are represented in specs for GPS receivers? I find that Trimble says the Resolution T (http://www.trimble.com/resolutiont.shtml) has 15 ns (1 Sigma) like the M12+. So I guess the real question is; are you comparing apples to apples when the

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread Randy Warner
, 2006 9:39 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Best GPS 1PPS Accuracy One problem is that older GPS receiver spec sheets give numbers with SA on, even though SA has been off for quite some time, so their numbers will be inherently higher. Probably

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread Randy Warner
and frequency measurement' Subject: Re: [time-nuts] Best GPS 1PPS Accuracy Mit freundlichen Grüssen Paul Klöckler Coral links Gmbh Postfach 6955 CH-3001 Bern Schweiz -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Randy Warner Sent: Mittwoch, 13

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread Randy Warner
] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, December 13, 2006 4:56 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Best GPS 1PPS Accuracy Hi guys, slightly off-topic, but has anyone done stability tests with the m12+ or M12M when the antenna goes bad in TRAIM-enabled mode (e.g. less than 4 good

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread SAIDJACK
Hi Randy, as always, great info! yes, please do send out the old VP TRAIM doc :) thanks, Said ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Best GPS 1PPS Accuracy

2006-12-13 Thread Jack Hudler
Many thanks for the long post! You validated many of my concerns about the current state of amateur GPSDO's. Thanks again, Jack ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts