Certainly cheap…. BUT On the ublox site there is a table indicating that the KT is a standard precision engine. On the same table, the UBX-M8030-KT-FT is required for timing:
< https://www.u-blox.com/sites/default/files/GNSS-Chips_Linecard_%28UBX-13004716%29.pdf > < https://www.u-blox.com/sites/default/files/products/documents/UBX-M8030-KT-FT_ProductSummary_%28UBX-14001605%29.pdf > So, they may be cheap, very cheap, but are they really what a TN would want? Hope that helps. Mike > Le 15 juin 2016 à 01:38, Attila Kinali <att...@kinali.ch> a écrit : > > 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. "The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw _______________________________________________ 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.