Guys, We tested the recent firmware updates for the JLT products, and they correctly output the 23:59:60 time stamp, this firmware even outputs the correct leapsecond timing if GPS signals are totally lost and the GPSDO is in GPS-holdover mode during the actual event. We recorded a video of the leap second event from the LCD screen of our new Low Noise Rubidium GSPDO. You can see it here, showing GPS time, UTC time, and the total number of leapseconds added:
https://vimeo.com/132296287 This LN Rb GPSDO uses the new Ublox M8T with multi-GNSS support. It worked as expected with GPS reception, but with GLONASS-only reception we found an interesting issue where the receiver stopped generating position fixes for about 10 seconds, then recovered by itself. This is similar to the issue posted yesterday by Martin on the NVD8C-CSM unit that reset itself when the leap-second happened, except our unit did not reset itself, it simply recovered by itself. We will be working with Ublox to see that this issue is corrected for future events. Here are some sample outputs: LN-Rb w/GPS: $GPZDA,235958.00,30,06,2015,+00,00*4E $GPZDA,235959.00,30,06,2015,+00,00*4F $GPZDA,235960.00,30,06,2015,+00,00*45 $GPZDA,000000.00,01,07,2015,+00,00*4D $GPZDA,000001.00,01,07,2015,+00,00*4C $GPZDA,000002.00,01,07,2015,+00,00*4F LN-Rb w/GLONASS: $GPZDA,235958.00,30,06,2015,+00,00*4E $GPRMC,235958.00,A,3611.3765,N,11518.1240,W,0.0,0.0,300615,,*29 $GPZDA,235959.00,30,06,2015,+00,00*4F $GPRMC,235959.00,A,3611.3765,N,11518.1240,W,0.0,0.0,300615,,*28 $GPZDA,000000.00,01,07,2015,+00,00*4D $GPRMC,000000.00,A,3611.3765,N,11518.1240,W,0.0,0.0,010715,,*2A $GPZDA,000001.00,01,07,2015,+00,00*4C $GPRMC,000001.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*27 Notice the unit starts indicating invalid fix and no PVT data here $GPZDA,000002.00,01,07,2015,+00,00*4F $GPRMC,000002.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*24 $GPZDA,000003.00,01,07,2015,+00,00*4E $GPRMC,000003.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*25 $GPZDA,000004.00,01,07,2015,+00,00*49 $GPRMC,000004.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*22 $GPZDA,000005.00,01,07,2015,+00,00*48 $GPRMC,000005.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*23 $GPZDA,000006.00,01,07,2015,+00,00*4B $GPRMC,000006.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*20 $GPZDA,000007.00,01,07,2015,+00,00*4A $GPRMC,000007.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*21 $GPZDA,000008.00,01,07,2015,+00,00*45 $GPRMC,000008.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*2E $GPZDA,000009.00,01,07,2015,+00,00*44 $GPRMC,000009.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*2F $GPZDA,000010.00,01,07,2015,+00,00*4C $GPRMC,000010.00,V,0000.0000,N,00000.0000,E,0.0,0.0,010715,,*27 $GPZDA,000011.00,01,07,2015,+00,00*4D $GPRMC,000011.00,A,3611.3784,N,11518.1240,W,0.0,0.0,010715,,*25 Recovers here $GPZDA,000011.00,01,07,2015,+00,00*4E $GPRMC,000011.00,A,3611.3784,N,11518.1240,W,0.0,0.0,010715,,*26 $GPZDA,000012.00,01,07,2015,+00,00*4F $GPRMC,000012.00,A,3611.3784,N,11518.1240,W,0.0,0.0,010715,,*27 $GPZDA,000013.00,01,07,2015,+00,00*48 $GPRMC,000013.00,A,3611.3784,N,11518.1240,W,0.0,0.0,010715,,*20 Keith _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.