Hi The two plots shown appear to be identical. If they are actually two different runs, the problem repeats very closely.
If the GPS is not in position hold *and* the antenna is less than ideal - That’s the sort of thing you may see. Essentially it’s got two locations it “thinks” are correct. Another possibility is a position hold situation with a very low satellite count. As a single observed satellite goes in and out of multi path, the solution goes all over the place. Again, you need a challenged antenna for this to happen. Pretty much all of this would be apparent from the normal messages out of the part. Bob > On Apr 18, 2016, at 10:13 PM, Michael Wouters <[email protected]> > wrote: > > Does anyone have experience with the Trimble SMT 360 ? > > I bought some of these four or five months after they were released. During > testing, the 1 pps output evidenced a problem, as shown in the attached > plot (the 1 pps is being measured against a Cs beam standard), which is > not sawtooth-corrected. While there are longish periods of nominal > operation, the receiver seems to hop between two solutions. This behaviour > is well out of specification. > > When I contacted Trimble support, they said that the firmware in the > receivers was very early, and replaced the receivers. However, the problem > was still evident with the new firmware. Trimble did not respond to further > emails. > > I tried many things to isolate the problem, including restricting the > receiver to GPS-only but I was unable to make an improvement. > > I would like to know if anyone else is operating an SMT 360 and if they > have seen any similar behaviour. > > Cheers[image: Inline image 2] > Michael[image: Inline image 1] > <smt360.png><smt360.png>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
