Brooke, While there may be some variations in how manufacturers code their TRAIM algorithms, I have attached an OLD (1998!) Motorola Doc concerning their TRAIM. Basically, you can tell the receiver how to handle TRAIM errors. You can tell the receiver to keep outputting the 1PPS and flag it as suspect, turn it off until the TRAIM alarm condition is rectified, etc.
You guys using the old 8 channel VP and UT+ receivers use the @@En message to control this. On newer receivers such as the M12+, control is broken down into three separate messages (@@Gc, @@Gd, and @@Ge). Randy ________________________________________________________________________ ________________________________ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: Friday, August 11, 2006 11:30 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SiLabs Hi Randy: Would you elaborate on how TRAIM works. I thought that it acted like a switch and either allowed the 1 PPS output or turned it off. But you seem to be saying that it can remove a bad satellite from the solution and maintain the 1 PPS output. Is that the case? Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Randy Warner wrote: >Glenn, > >You're right. I would expect quite a bit of jitter. My comment about >USB-Serial converters probably should not be on a "timing" news list. >However, the 1PPS coming in on the DCD line of a standard serial port >jitters too, but is still plenty accurate for "loose" timing systems >like NTP servers who are only looking for millisecond type resolution. > >I think one of the main reasons we still sell a lot of timing receivers >to these customers is really because of the TRAIM function. They really >don't need ns type accuracy, but they DO want the receiver to alert them >to large anomalies due to sick satellites, and to automatically remove >the satellites from the solution. > >Randy > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
TIMERAIM.PDF
Description: TIMERAIM.PDF
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