Brian, I would not expect 250ns to cause any problems. The data I was talking about yesterday was pretty old and S/A WAS on at that time which made it much harder to keep the 1PPS accurate. I would hope that the firmware in the receivers has been improved too.
Randy ________________________________________________________________________ ________________________________________ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Kirby Sent: Thursday, December 14, 2006 5:16 PM To: Discussion of precise time and frequency measurement Subject: 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 wrote: > 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 are not allowed to settle out between alarms and > tossing SVs out of the solution you might get all sorts of erroneous > stuff. I guess it would ultimately come down to how the receiver > firmware was written. > > > Randy > > ______________________________________________________________________ > __ > _______________ > > Hi guys, > > "enough RAM" is a keyword here! Doing outlier detection using i.e. > median filters etc seems prudent... > > Part of my question was if anyone had any experience with setting the > TRAIM limits really tight, to say +-20 or +-50ns and let TRAIM do the > work. I rather have no pulses than bad pulses. > > Thanks, > Said > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts