Not the previous links as but this/these ones https://www.ebay.co.uk/itm/Neo-6M-NE0-7M-GPS-Mini-Satellite-Positioning-Module-51-SCM-MCU-For-Arduino/142760332765?hash=item213d2dcddd:g:U6oAAOSwXeJawafs
User on EEVBLOG mentions , true or not I don't know, but they did not have any luck. https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/new/?topicseen#new Starting at reply/post 890 -=Bryan=- ________________________________ From: time-nuts <[email protected]> on behalf of Bob kb8tq <[email protected]> Sent: February 20, 2021 1:53 PM To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning Hi What leads you to believe that these: https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649 Are fakes? Bob > On Feb 20, 2021, at 3:40 PM, Bryan _ <[email protected]> wrote: > > Apparently listing are fake Neo's, but perhaps unsoldering the pcb board may > be worth the money for a module swap. Although the not sure if the M8T is pin > compatible with the 7M modules. Don't see any documentation either, but I am > sure there is other similar boards out there on fleabay. > > https://www.ebay.co.uk/itm/Neo-6M-NE0-7M-GPS-Mini-Satellite-Positioning-Module-51-SCM-MCU-For-Arduino/142760332765?hash=item213d2dcddd:g:U6oAAOSwXeJawafs > > > -=Bryan=- > > ________________________________ > From: time-nuts <[email protected]> on behalf of Bob kb8tq > <[email protected]> > Sent: February 4, 2021 7:01 PM > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning > > Hi > > Again, in case anybody else is interested …. > > https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649 > > Turns out to be a bit more than what the listing implies. The parts I got > also came with a cable that goes from the round connector on the assembly > to an HDMI connector. That explains the HDMI connector pinout information > in the listing. > > The big ugly “plate” turns out to be easily removed from the assembly. > That leaves you with a nice die cast box that is roughly 3 x 2.5 x 1”. It > mounts to the plate via 4 small screws. > > Since you have a cable that fits the round connector, wiring it up to this or > that should be pretty easy. > > Yes, the price keeps climbing …. > > Bob > >> On Jan 19, 2021, at 2:43 PM, Bob kb8tq <[email protected]> wrote: >> >> Hi >> >> I don’t know if anybody else bought any of these or not. >> >>> On Jan 9, 2021, at 10:20 PM, Bob kb8tq <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Hi >>> >>> Just for the sake of listing all the variations: >>> >>> https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 >>> >>> <https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timing-Module-Board/333778776570?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649> >>> >>> Is the M8T on what I would *guess* is the original board. Simply from >>> looking at the picture I think >>> you can guess pretty well what’s what on the board. >>> >>> Hint: If you buy quite a few …. errr … 10 … there s a pretty good chance >>> that something more than >>> 20% might get knocked off the price …. I bought a pretty large pile of >>> stuff so it’s not clear if that >>> had some impact on what offers got accepted ….. >>> >>> If that’s not your favorite RF connector on the board, there are SMA’s that >>> likely fit in the same footprint. >>> >>> Bob >> >> If you did, the link now goes to a new auction (at a higher price). >> That auction shows the board in it’s proper enclosure and provides a bit >> more ( but not quite all) information on the module. Since they are now >> free shipping a much heavier gizmo, that might explain some of the >> price increase. >> >> If you look at the box, the connector on that box most certainly is not an >> HDMI connector. However it *does* tell you what signals are running around. >> You have the PPS out on RS-422. You also get the serial out of the module >> on another RS-422 pair. >> >> The clock in / clock out stuff … no idea. The EXT-INT pin on the M8T is >> driven >> by the 8051 CPU on the board. It’s a good bet that’s what those clocks are >> getting to. >> >> The TI switcher chip on the board has it’s input clamped at 20V. It puts out >> 6.2V. No >> idea what the correct input is. It seemed to be very happy with the 15V I >> put on it. >> Pin 1 on J1 is power in. Pin 6 on J2 is ground. Ground also shows up on one >> of >> the mounting holes. The other pins on J2 appear to be 3 RS-422 pairs. >> >> All of the I/O lines are protected with clamp diodes. The antenna has >> multiple >> layers of protection. The debug pins on the C8051F320 come out to a connector >> that may or may not be populated on this or that board. There is a flash >> chip on >> the back side and an EEPROM on the front. If somebody was more ambitious >> than I am, reprogramming the MCU to do fancy stuff might be possible. >> >> Fun !!! >> >> Bob > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
