On Mon, Dec 15, 2014 at 9:09 AM, Brian Inglis <brian.ing...@systematicsw.ab.ca> wrote: > On 2014-12-14 10:29, Francesco Messineo wrote: > >> The A1029, which is a newer model, has indeed a PPS output and I've >> been able to find a datasheet for it but the pinout isn't anything >> like the A1025. >> I planned to reverse engineer the pinout, but I'd like at least not to >> be forced to try to guess the power pins. Maybe someone still has the >> data for this older module. > > > One article mentions the A1029 as a drop in replacement for the A1025, > as an early auto receiver with gyro and dead reckoning nav "holdover", > but that may refer to the complete module, and you may have just the GPS. > > The GPS could have provided PPS for DR nav, and some TE model specs offer > TCXOs, which may also have been required for DR timing holdover, but may > not have been part of the GPS. > > Those GPS seem to have been standard STMicroelectronics parts with firmware > customization for functions and additions, and offered proprietary $PSTM > NMEA sentences. If you can read off the STM part STA 2... (perhaps under > a patch antenna) you may be able to search for more details.
I've found a couple of articles saying the A1025 indeed has PPS output as I suspected. However, none of them reports any hint about the pinout of this module. The module itself is soldered on a small daughter board, so I can't look on the other side for possible part numbers other than the tyco electronics one. The daughter board has some transistors, passives, a 74HC14 and a small component, probably a power supply regulator that I can't identify. It's a microchip part marked CS05351CK (CS0535 1CK in two rows). Reverse engineering is not progressing much also because of this unknown microchip part. Regards Frank _______________________________________________ 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.