[time-nuts] Ebay Huawei Ublox M8T Modules Warning

Mon Jan 11 16:25:42 UTC 2021

In the past removed more than 10  5T's with no problems using a Propane Torch, tapping the board and the devices did slide off. No problem.                 Noticed Bluegirls changing her listing based on Nigel's false information. For the record pin 18 of the LEA devices is a very nice feature and can feed power to an active antenna. It is a coil coupling to the RF line and according to spec up to 6 V can be applied. Short protection should be included to protect the coil. This allows user to feed an active antenna or when using a spliter no power feed to the unit saving a capacitor that I always include on telecom devices.                                                                       Bert Kehren                                                                                                                                                                                                                                                                                                                               In a message dated 1/11/2021 10:15:10 AM Eastern Standard Time, paulswedb at gmail.com writes: 
With respect to the cut boards they are about 5 layers and some of the
layers are shorted by the cut. Perhaps sanding them down would allow the
boards to be used directly. My luck at popping the module off the board has
not been very successful so far.
Regards
Paul

On Sun, Jan 10, 2021 at 10:03 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> There appear to be a lot of the cut off boards. The assemblies may well be
> usable “as is”. It’s too bad there aren’t more of them. At the price, they
> are
> (used to be) an attractive alternative.
>
> Bob
>
> > On Jan 10, 2021, at 8:41 PM, Didier Juges <shalimr9 at gmail.com> wrote:
> >
> > ebay seller Queen's Land sent me this picture of the back of the cut off
> > board. Apparently they still have a bunch.
> > https://www.ebay.com/usr/queen*s_land?ul_noapp=true
> >
> > Didier KO4BB
> >
> > On Sun, Jan 10, 2021 at 3:47 PM Bob kb8tq <kb8tq at n1k.org> wrote:
> >
> >> HI
> >>
> >> Looking a bit more closely at the remains of the “chopped up” boards
> with
> >> the M8T’s on them …
> >> This board is *not* the source of those devices. What’s left of the
> >> marking on those boards
> >> does not line up with what’s on these (now sold out) boards.
> >>
> >> There seems to be at least one switching regulator on this board, a CPU
> >> (with JTAG programming
> >> connector ??),  and a fairly elaborate antenna bias / protection
> circuit.
> >> No idea what might be on the
> >> back of the board.
> >>
> >> With any luck, they will get more of these in stock.
> >>
> >> Bob
> >>
> >>> On Jan 9, 2021, at 10:20 PM, Bob kb8tq <kb8tq at n1k.org> 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
> >>>
> >>>> On Jan 9, 2021, at 6:41 PM, Nigel gm8pzr via time-nuts <
> >> time-nuts at lists.febo.com <mailto:time-nuts at lists.febo.com>> wrote:
> >>>>
> >>>> Hmmmm
> >>>>
> >>>>
> >>>>
> >>>> was kinda thinking that might be the case, perhaps time to hope they
> >> weren't tested after all!
> >>>>
> >>>>
> >>>>
> >>>> Late here, will check tomorrow
> >>>>
> >>>>
> >>>>
> >>>> Nigel GM8PZR
> >>>>
> >>>>
> >>>>
> >>>> Hi
> >>>>
> >>>> The “normal chips” that should be inside the module all have something
> >> like a 3.6V max supply rating on them.
> >>>>
> >>>> I would guess that 5V will melt a goodly number of them.
> >>>>
> >>>> Bob
> >>>>
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> > <M8T.jpg>_______________________________________________
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