Hello We recently got in a Symmetricom S250 for calibration. There was an advisory a few months ago about this unit having the usual GPS week number problem with TOD rolling back 1024 weeks. The advisory says that 1 pps, 10 MHz should still be Ok but this is not the case. The receiver appears to be Ok - it goes into ‘position hold’ and comes up with good coordinates and is tracking 8 to 10 satellites. The timing outputs are clearly not GPS locked though. Has anyone else experienced problems? Cheers Michael