Hi there, this could also be caused by a slight error in the Auto Survey position of the Fury GPSDO. The M12 does the auto survey over 3 hours, so you are limited to the accuracy and constellation of the Sats during that time period. You could try the following to improve your position accuracy: 1) Write down your present hold position. 2) Do another auto survey, preferably at night if you did the first one during the day, or during the day if you did it at night etc. 3) Average the two resulting positions, pay particular attention to Antenna height. For example if you get a height of 45 meters and 47 meters from the two measurements, use 46 meters as the averaged result. 4) Enter the averaged position into the unit manually by using the: GPS:POS and: GPS:POS LAST commands. 5) Repeat from 1) as necessary. Additionally you could try: 6) Increase your Mask angle from 10 Degrees with the command GPS:SAT:TRAC:EMAN 20 7) Make sure the M12 TRAIM is turned on with the command: GPS:REF:TRAIM ON Hope that helps, bye, Said In a message dated 12/20/2008 12:40:28 Pacific Standard Time, kc0...@msosborn.com writes:
I've been tracking my Fury GPSDO (ROM version 1.21) equipped with an Isotemp OXCXO134-10 oscillator for a couple of weeks now and have noticed that the Time Interval (TI) spikes around 20 to 40 nsec everyday at 17:45 UTC (11:45 AM CST local time). There are minor spikes (5 nsec) every 2 to 3 hours, but I find the large spikes to be very curious. The oscillator itself has no idea of the time of day (does it?), the Fury generated EFC follows the spike and brings the TI back into line within tow or three minutes. There are no unusual charges to the EFC prior to or after the spike. I've already tracked ambient temperature over several days and have seen nothing unusual. I'm going to monitor line voltage next. Has anyone else ever seen such behavior? -- kc0ukk at msosborn dot com _______________________________________________ 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.