Mike Cook wrote: > It wouldn't surprise me, but you have a reference for this?
I first read about this issue in the official Ublox forum Mike - try this link, http://tinyurl.com/Fake-M8Ns - at time of writing it leads to some of the messages that discuss the issue with photos and examples of M8N's that appear - not to be ! I must say, the two devices I have, appear to be genuine, and do everything they should, and are a wonderful piece of kit. My initial (now erroneous) thought was that maybe I could do a quick overnight run with Lady Heather 5, to show up the M8N oscillator type. Thanks to the excellent feedback on this thread, I now see why this is not so, my overnight graph (seen in OP) is looking at a layer of operation that somewhat hides the actual oscillator behaviour. I still think it is an interesting graph, and shows the M8N can do a good job of being a GNSS timing part. Although as Mark S has said, it requires independent testing against a reference to be done, rather than my graph - which essentially is the M8N "self reporting" its quality. >From my reading so far, the current best way to find out if you have a genuine M8N is to use u-centre , and ask it to poll the UBX-MON-VER command, which should return: ----------------------------------------------------- original firmware (2.01): SWVER 2.01 (75350) HWVER 00080000 EXTENSION 2.01 (75331) PROTVER 15.00 FIS 0xEF4015 (79189) MOD NEO-M8N-0 GPS;SBAS;GLO;BDS;QZSS after firmware update to (3.01): SWVER EXT CORE 3.01 (107900) HWVER 00080000 EXTENSION ROM base 2.01 (75331) FWVER=SPG 3.01 PROTVER=18.00 FIS=0xEF4015 (100111) GPS;GLO;GAL;BDS;SBAS;IMES;QZSS ----------------------------------------------------- Take special note of the "FIS=" (Flash Information Structure) size. Firmware Update to 3.01 can give you the (newly turned on) Galileo system, however some people (like me) may choose to stay with Firmware 2.01 because it allows playing the RTK game thanks to the work of: http://rtkexplorer.com/ Again, thank you for the replies to this thread, I have learned a lot, and especially Bob Camp, who gave a nice explanation of the oscillator in such a GNSS module. Regards, Geoff (Christchurch, New Zealand). _______________________________________________ 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.