Glenn Interesting to hear your problems with the Datum - I have the same problem with an Odetics 325 - my date is the same , currently Sept 02,1988, but I am pleased to tell you that it has no effect on the performance of the equipment. I have the correct time and a GDOP of 1.8 and TFOM=4 . I did have to replace the lithium battery in the Receiver section (it had 0 volts!) and now the system can store its essential data and re-start with little delay. I would like to find a firmware correction to this problem, but as I have been informed - "the date was never a priority with GPS" ! ? Its nice to have this facility as well as the Rubidium Standard - they are now in step, and checked every day.
Good luck Roy P ----- Original Message ----- From: "Glenn Little WB4UIV" <[EMAIL PROTECTED]> To: "Time-Nuts list" <[email protected]> Sent: Friday, April 18, 2008 6:19 AM 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 -- [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.
