Hi Glenn I'm pretty certain I have a manual for this (will check and get back to you). However, Symmetricom are right about the firmware, this unit was prior the Datum takeover, and they don't have the information available now. If the unit is tracking, then the time should be right, but date wrong. It only affects the date, and should not have any affect on its ability on frequency outputs and disciplining the Rubidium. The engine used would have been a Trimble one, but without checking the manual, I can't tell you which. Other time nuts have reported this problem, and it may be worth checking the archives.
Rob Kimberley -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Glenn Little WB4UIV Sent: 18 April 2008 06:20 To: Time-Nuts list Subject: [time-nuts] week 1024 roll over I recently bought a Datum GPS Time/frequency System 9390-5593. When I enter date, time and location, it fails to indicate GPS lock. It is indicating GPS week 451, when the week is really 1475. It is also indicating that the day is 246. I highly suspect that the receiver has firmware that needs to be updated. I have not disassembled the equipment far enough to verify the type of GPS engine installed. Does anyone know what GPS engine is installed in this equipment? Will the 1024 week rollover cause the receiver not to lock, I suspect that the receiver will not lock as it has incorrect date? Can I change the engine to something that has correct firmware? Does the receiver output NMEA 0183 data or something unique? I contacted Symmetricom as they bought Datum. They say this product was out of support prior to them buying Datum. I requested the price of a manual. They will sell me one, if they have one to copy, for a mere $250.00. I suspect that they do not have a firmware update that they will release for a reasonable cost. This is a hobby, not a business for me. Any help or advice? Possibly just scrap this and use the Rb standard? Thanks 73 Glenn WB4UIV _______________________________________________ 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. _______________________________________________ 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.