Moin, Some of you might know that the u-blox chips are available in small quantities and for quite cheap too. Just go to aliexpress or taobao and type in "UBX-G7020" or "UBX-M8030" and you will get plenty of results. My guess is, that these chips are leftovers from cellphone production that get sold off close at wholesale price (I've seen that with other chips as well). So it is likely that these are actually genuine chips.
Now, the documentation for those chips is not that readily available. But fret not! Some of it can be found if you look hard enough. At least for the G7020. I think, this information should be enough for anyone who wants to build his own GPSDO with Trimble like oscillator control (ie that the reference oscillator of the GPS module is steered directly). The UBX-M8030-KT, which would be a timing chip and thus for sure support the RAW data commandos, is unfortunately quite google proof. At least I couldn't find any documentation for those but the official public one provided by u-blox. I would guess, that the pin out is very similar if not the same, but without guarante. (I know that least the UBX-M8030-KT datasheet UBX-13001634 is floating around, but So far i was not able to get hold of it, due to insufficient chinese language skills) As for the UBX-G7020, you can find the following documents: UBX-G7020-KT/KA u-blox 7 GPS/GNSS chips Data Sheet GPS.G7-HW-12001 https://raw.githubusercontent.com/ArdentHeavyIndustries/straightedge-gps-firmware/master/Datasheets/UBX-G7020-Kx_DataSheet_(GPS%20G7-HW-12001)_Confidential.pdf.pdf u-blox 7 GPS/GNSS chips Hardware Integration Manual GPS.G7-HW-10003 https://www.olimex.com/Products/Modules/GPS/MOD-GPS/resources/UBX-G7020_HardwareIntegrationManual_-GPS.G7-HW-10003-_Confidential.pdf So, if anyone would want to give those a try, let us know. I'm sure many here would be interested. Attila Kinali -- Malek's Law: Any simple idea will be worded in the most complicated way. _______________________________________________ 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.