Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[John Miller via time-nuts]

Hey Bob, (and whoever else has got one of these things)
I'm curious as to what degree of progress has been made using these 
little modules as-is. I know some people are pulling the M8T modules off 
to upgrade other systems but I want to try and use it as it was 
designed, as much as I can anyway.


Mine arrived today and I have been probing and poking at it off and on 
for the past 12 hours, and this is what I have found so far:


- J3 is a standard 3v3 UART running straight into the M8T. Rx (into the 
M8T) is disabled, so you need to add a jumper link to R17. It comes 
right up with NMEA at 9600 baud, but as soon as the MCU on the board 
boots up it (the MCU) sends a message that halts the NMEA. I have 
confirmed with a logic analyzer that *something* is still being sent but 
I'm not sure what, maybe ubx? It isn't much, but it happens about once a 
second.. If you disconnect the main external power and feed 3v3 in 
through this header the M8T does run as a normal standalone ublox 
package would, and I am able to modify settings.


- The M8T (maybe) can't be run off of the 3v3 UART tap alone, because 
the antenna's LNA is powered from the main power, and the antennas I use 
don't seem to like running totally passively, it's probably possible to 
just pump power into this but I haven't gone that far, yet.


- I have captured what the MCU is sending to the M8T (from monitoring 
the Rx pin on the UART header) but I haven't been able to make heads or 
tails of what it means yet.


- The pinout for J2, the main connector, as best I can tell (going off 
of what you have provided):

-- P1 - power, the docs say 15-35v, I fed in 20v and it's doing fine
-- P2 & P3 - RS422 pair for control data into the M8T
-- P4 & P6 - RS422 pair for data out of the M8T (maybe out of the MCU, I 
haven't traced this fully yet)

-- P6 - ground
-- P7 & P8 - RS422 pair for PPS

I have a few RS22/485 transceivers coming next week so hopefully I can 
confirm more of this. The HDMI pinout nokia provides is a little bit 
misleading because it includes a number of pins that are not used here, 
namely "SingleEndedIn: REF2M_IN REF10M_IN" and "GPS_PWR_RET" - this 
confused me for a little bit.


- On the bottom of the board are three chips, a 1Mbyte flash, and two 
UART-RS422/485 transceivers. Both of the transceivers are 8pin SOICs, 
one handles the control/data Tx/Rx, and the other handles the PPS. 
Something a bit curious is that one is a TI SN65HVD1474 (U3) and the 
other is a Maxim MAX3490 (U4). They have identical pinouts and very 
similar specs (20mbit vs 10mbit, respectively). Why not use two of the 
same? Vendor diversification? Manufacturer ran out of one and subbed the 
other? Curious!


- Even more curious is the way the SN65HVD1474 (U3) is configured. I 
have checked this at least two dozen times and keep coming up with the 
same results. Instead of A & B being paired, then Z & Y being paired: A 
& Y are paired, and B & Z are paired, each running the J2P7 and J2P8 
respectively. I cannot wrap my head around this. I have not yet checked 
to see what is feeding into the R & D lines of U3.


- There are three LEDs on the board, a red one which is only visible 
with the lid off that I have only ever seen illuminated, a green one 
that goes through the lightpipe to PWR, and a dual-color red/green one 
which has the following modes: flashing red 2Hz, while acquiring? 
Flashing green 2Hz (not sure, but it outputs PPS?), solid green - after 
about 20 minutes, I'm not certain.


- I have only barely started to look into the MCU, a Silicon Labs 
C8051F340. At the very least I would like to be able to dump the SPI 
flash on the back and the 8kbyte I2C EEPROM on the front. My guess would 
be that they're being used for logging and runtime, maybe calibration 
parameters? I found a C8051F340 evaluation board and it has a 10 pin 
header marked "debug", with a pinout. J7 on this board seems to be very 
close, but not identical. I'll need to dig into this one a bit more. 
Honestly, to get started, it may be as simple as holding RST high to 
just keep the MCU out of our way.


Also, I've been snapping a few pictures as I go along, they may be 
useful to others:

https://photos.millerjs.org/?f=Nokia_FYGM_GNSS

And here's a capture of what is coming out of the M8T's UART once it 
gets a solid lock:

Text: https://files.millerjs.org/Nokia_FYGM.txt
If you have Saleae Logic (free download): 
https://files.millerjs.org/Nokia_FYGM.logicdata


Regards,
John
KK4YWH

On 2021-02-04 10:01 pm, Bob kb8tq wrote:

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 b

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bryan _]

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  on behalf of Bob kb8tq 

Sent: February 20, 2021 1:53 PM
To: Discussion of precise time and frequency measurement 

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 _  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  on behalf of Bob kb8tq 
> 
> Sent: February 4, 2021 7:01 PM
> To: Discussion of precise time and frequency measurement 
> 
> 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  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 >> <mailto:kb...@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
>>
>> 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 bo

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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 _  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  on behalf of Bob kb8tq 
> 
> Sent: February 4, 2021 7:01 PM
> To: Discussion of precise time and frequency measurement 
> 
> 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  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 >> <mailto:kb...@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
>> 
>> 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
>

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bryan _]

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  on behalf of Bob kb8tq 

Sent: February 4, 2021 7:01 PM
To: Discussion of precise time and frequency measurement 

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  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 > <mailto:kb...@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
>
> 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

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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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  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 > > 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
>>  
>> 
>> 
>> 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

___
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To unsubscribe, go to 
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

Hi

I don’t know if anybody else bought any of these or not. 

> On Jan 9, 2021, at 10:20 PM, Bob kb8tq  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
>  
> 
> 
> 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
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Matthias Welwarsky]

Hi,

On Montag, 11. Januar 2021 23:32:24 CET Nigel gm8pzr via time-nuts wrote:
> Noticed Bluegirls changing her listing based on Nigel's false information.

Well, the change to the power supply voltage is certainly correct. The antenna 
supply rating is at least safe now. It might be OK to feed 5V there, but 
that's hard to say without having traced out the circuit. There is no external 
DC block on the PCB (see figure 10 in the LEA-M8 HIM) but that requirement 
seems to be due to V_ANT being connected to GND. That's clearly not the case 
here. There's another variant of active antenna circuit in figure 12, but here 
the supply voltage is fed through V_ANT, which is not what's implemented on 
this breakout board. So it _might_ be OK to feed 5V for antenna bias but not 
sure.

Btw the same PCB shows up in other listings in their shop, with a LEA-5T and a 
LEA-6T. 

> 
> 
> 
> Hm Really?
> 
> 
> 
> Please help me understand what false information I'm supposed to have
> provided?
> 
> 
> 
> I've explained to the seller that the supply voltage should be quoted as a
> nominal 3.3V, with a maximum of 3.6V,
> 
> and that the antenna supply is recommended to be up to 5V with a maximum of
> 6V.
> 
> Ok, so the data sheet actually specifies the Antenna voltage range operating
> range 2.7 to 5.5V, but I was trying
> 
> to keep it simple.
> 
> 
> 
> Unfortunately it seems that the connection data supplied by this and other
> sellers is based on stock images,
> 
> either you get the incorect original showing two 5V supplies, or the current
> alternative showing two 3.3V supplies.
> 
> The current image may not be telling the whole story but, as I commented
> earlier, at least it's playing it safe.
> 
> Beyond that I guess it's back to RTFM as always!
> 
> 
> 
> Nigel, GM8PZR
> 
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com
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> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow
> the instructions there.





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[time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Nigel gm8pzr via time-nuts]

Noticed Bluegirls changing her listing based on Nigel's false information.



Hm Really?



Please help me understand what false information I'm supposed to have provided?



I've explained to the seller that the supply voltage should be quoted as a 
nominal 3.3V, with a maximum of 3.6V,

and that the antenna supply is recommended to be up to 5V with a maximum of 6V.

Ok, so the data sheet actually specifies the Antenna voltage range operating 
range 2.7 to 5.5V, but I was trying

to keep it simple.



Unfortunately it seems that the connection data supplied by this and other 
sellers is based on stock images,

either you get the incorect original showing two 5V supplies, or the current 
alternative showing two 3.3V supplies.

The current image may not be telling the whole story but, as I commented 
earlier, at least it's playing it safe.

Beyond that I guess it's back to RTFM as always!



Nigel, GM8PZR

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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Philip Gladstone]

Are you heating the underside of the board with the hot air or the module
side? I was thinking that I'd try heating the underside of the board with
high temp hot air and then try to gently pry the module off. This probably
only requires three hands, so I should be good!

Philip

On Mon, Jan 11, 2021 at 12:57 PM Clint Jay  wrote:

> Do they have a ground pad on the underneath of them which solders to the
> board?
>
> If not then I'd suggest methodically working your way round them with
> solder wick, removing as much solder as you can before slipping the tip of
> a fine blade under a corner to apply the slightest leverage, you then work
> your way round the 'mousebites' again until you can see them separate from
> the board.
>
> I've recovered other, larger, older U-Blox modules that way.
>
> Alternatively add low melting point solder, wick it away, repeat the
> process until the 'standard' solder is diluted enough that a bit of heat
> from a hot air tool to the underside of the board allows you to lift the
> module off.
>
> On Mon, 11 Jan 2021 at 17:17, Bob kb8tq  wrote:
>
> > Hi
> >
> > Pulling those modules off a multi-layer board is an art. Some seem to be
> > able
> > to do it, others not so much. Applying a *lot* of heat (like with a torch
> > !!!) seems
> > to be one way to do it. Since the module is soldered internally, it is
> > tricky. That’s
> > why the “assemblies” at roughly the same price caught my attention.
> >
> > Bob
> >
> > > On Jan 11, 2021, at 9:53 AM, paul swed  wrote:
> > >
> > > 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  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 
> 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  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  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@lists.febo.com > wrote:
> > >>
> > >> H
> > >>
> > >>
> > >>
> > >> 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
> > >>
>

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Clint Jay]

Do they have a ground pad on the underneath of them which solders to the
board?

If not then I'd suggest methodically working your way round them with
solder wick, removing as much solder as you can before slipping the tip of
a fine blade under a corner to apply the slightest leverage, you then work
your way round the 'mousebites' again until you can see them separate from
the board.

I've recovered other, larger, older U-Blox modules that way.

Alternatively add low melting point solder, wick it away, repeat the
process until the 'standard' solder is diluted enough that a bit of heat
from a hot air tool to the underside of the board allows you to lift the
module off.

On Mon, 11 Jan 2021 at 17:17, Bob kb8tq  wrote:

> Hi
>
> Pulling those modules off a multi-layer board is an art. Some seem to be
> able
> to do it, others not so much. Applying a *lot* of heat (like with a torch
> !!!) seems
> to be one way to do it. Since the module is soldered internally, it is
> tricky. That’s
> why the “assemblies” at roughly the same price caught my attention.
>
> Bob
>
> > On Jan 11, 2021, at 9:53 AM, paul swed  wrote:
> >
> > 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  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  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  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  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@lists.febo.com > wrote:
> >>
> >> H
> >>
> >>
> >>
> >> 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
> >>
> >> ___
> >> time-nuts mailing list -- time-nuts@lists.febo.com   time-nuts@lists.febo.com>
> >> To unsubscribe, go to
>  http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com <
>  http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
> >> and follow the instructions there.
> >
> 
> 

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Matthias Welwarsky]

On Montag, 11. Januar 2021 15:53:30 CET paul swed wrote:
> 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.

I've used a hot-air station set to 350°C and high airflow with good success. 
Not very difficult, what's left of the PCB doesn't have a lot of thermal 
capacity. Just heat it up and slide an Xacto blade under the module. It'll 
come off easily.

Without hot air - one side after the other with a fat iron tip while sliding a 
blade under the pads might work, but the hot-air method is much easier and 
less fiddly.

Another idea - put the modules in a steel pan, heat them on the stove from 
bottom up, prod them from time to time with a knife. Eventually the modules 
will come off.

> Regards
> Paul
> 
> On Sun, Jan 10, 2021 at 10:03 PM Bob kb8tq  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  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  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  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-Timi
> > ng-Module-Board/333778776570?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p205787
> > 2.m2749.l2649> 
> > >> <
> > 
> > https://www.ebay.com/itm/ON-SALE-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-Timi
> > ng-Module-Board/333778776570?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2
> > 749.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@lists.febo.com > wrote:
> >  H
> >  
> >  
> >  
> >  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
> >  
> >  ___
> > >> 
> >  time-nuts mailing list -- time-nuts@lists.febo.com  > >> time-nuts@lists.febo.com>
> > >> 
> >  To unsubscribe, go to
> > >> 
> > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com <
> > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
> > >> 
> >  and follow the instructions there.
> > >> 
> > >> ___
> > >> time-nuts mailing list -- time-nuts@lists.febo.com
> > >> To unsubscribe, go to
> > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > >> and follow the instructions there.
> > > 
> > > ___
> > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > To unsubscribe, go to
> > 
> > http://lists.febo.com/mailma

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

Hi

Pulling those modules off a multi-layer board is an art. Some seem to be able
to do it, others not so much. Applying a *lot* of heat (like with a torch !!!) 
seems
to be one way to do it. Since the module is soldered internally, it is tricky. 
That’s 
why the “assemblies” at roughly the same price caught my attention. 

Bob

> On Jan 11, 2021, at 9:53 AM, paul swed  wrote:
> 
> 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  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  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  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  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@lists.febo.com > wrote:
>> 
>> H
>> 
>> 
>> 
>> 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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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Philip Gladstone]

What approaches have worked to pop these modules off the chopped board?

Philip

On Mon, Jan 11, 2021 at 10:15 AM paul swed  wrote:

> 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  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  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  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  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@lists.febo.com > wrote:
> > 
> >  H
> > 
> > 
> > 
> >  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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> > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
> >  and follow the instructions there.
> > >>>
> > >>
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> > >>
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[ew via time-nuts]

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, 
paulsw...@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  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  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  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  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@lists.febo.com > wrote:
> 
>  H
> 
> 
> 
>  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
> 
>  ___
>  time-nuts mailing list -- time-nuts@lists.febo.com  >> time-nuts@lists.febo.com>
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> >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
>  and follow the instructions there.
> >>>
> >>
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> >>
> > _

Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[paul swed]

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  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  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  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  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@lists.febo.com > wrote:
> 
>  H
> 
> 
> 
>  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
> 
>  ___
>  time-nuts mailing list -- time-nuts@lists.febo.com  >> time-nuts@lists.febo.com>
>  To unsubscribe, go to
> >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com <
> >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
>  and follow the instructions there.
> >>>
> >>
> >> ___
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> >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
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> >>
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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  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  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  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@lists.febo.com > wrote:
 
 H
 
 
 
 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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 time-nuts mailing list -- time-nuts@lists.febo.com > time-nuts@lists.febo.com>
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 and follow the instructions there.
>>> 
>> 
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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  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
>  
> 
> 
> 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 
>> mailto:time-nuts@lists.febo.com>> wrote:
>> 
>> H
>> 
>> 
>> 
>> 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
>> 
>> ___
>> time-nuts mailing list -- time-nuts@lists.febo.com 
>> 
>> To unsubscribe, go to 
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com 
>> 
>> and follow the instructions there.
> 

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[time-nuts] Ebay Huawei Ublox M8T Modules

[Mark Sims]

Can somebody point me  to a connection diagram for the external connections tp 
the carrier boards?
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[ASSI]

Am Samstag, 9. Januar 2021, 23:38:35 CET schrieb gandal...@aol.com:
> Now a question, supposing someone did follow that diagram and applied 5
> Volts to Vcc on the M8T, what is the risk of damage and would it be
> immediately obvious?

The commonly agreed upon definition of an abs max rating is that anything is 
possible if you happen to exceed it even just a tiny bit, including latent or 
immediate permanent damage.  Practically there is always some headroom since 
otherwise nobody would be able to test and guarantee that specification.  How 
much headroom?  You don't know…

Looking at the block diagram that VCC goes into a power management block that 
has a DC/DC converter of unspecified type, but surely some sort of down-
converter, so that VCC terminates into some switching stage and hopefully 
never enters any downstream circuitry directly.  The potential failure modes 
would be direct damage to the switching transistor(s) in the converter due to 
overvoltage or switching loss or (less likely, but possible in certain 
topologies) that the internal supply exceeds whatever voltage it's supposed to 
produce.  Unless the switching stage fails catastrophically (typically 
shorting the supply as a result, which will announce itself immediately) which 
becomes more likely the higher the applied voltage and the longer you apply it 
(both will shorten the lifetime exponentially) I'd suspect that you couldn't 
tell without grinding the chip down and looking at it under an SEM and even 
probing the individual transistors.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

SD adaptation for Waldorf microQ V2.22R2:
http://Synth.Stromeko.net/Downloads.html#WaldorfSDada




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[time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Nigel gm8pzr via time-nuts]

Many thanks for the comments on this, I've since heard from the seller who 
tells me they were listed as tested after being pulled from working kit and 
haven't been tested since at 5 volts, phew:-)
I remember the missing diodes on fluke.l's version of the Tbolt monitor, and 
also seem to remember that some at least recovered and went on to work ok once 
the diodes were fitted, but haven't had any experience of over voltage on Ublox 
kit so didn't know what to expect with these.

The error was in the connection data, the boards themselves aren't faulty, well 
not that I know of yet anyway:-), and that diagram has since been changed, 
unfortunately it now shows both the supply voltage and antenna voltage as 3.3V 
but at least that's playing it safe.
With regards to the origins of this board it's certainly been around for some 
time, and the same board or very similar versions are also available fitted 
with LEA-5T and LEA-6T modules, and all look to be original production, 
presumaby a touch of "if it ain't broke don't fix it"!
I specifically went for this board because of it's simplicity, I will need to 
trace out exactly what goes where but as a pre-assembled carrier with basic 
connections already available, and perhaps enough room for some modification if 
required, it seemed ideal, with some of those more complex modules on offer I 
wouldn't have the faintest idea where to start:-)

Nigel, GM8PZR

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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[ew via time-nuts]

We use the board but my boards are presently in Connecticut so I can not check. 
Pin 18 of the Ublox is used to feed power to an active antenna that is why the 
Rf pin does not have a capacitor. I have fed 5V in to pin 18 on ny Saw Tooth 
boards.  Some one check if pin 8 in question is connected to pin 18, may have a 
resistor in series to prevent to much current. May also measure against the 
center pin of the SMA  Hardwarre  manual limits the Voltage to 6V.              
                                                                                
                                       Bert Kehren                              
                                                                                
                                                                                
                                                                                
              In a message dated 1/10/2021 6:02:50 AM Eastern Standard Time, 
time-n...@welwarsky.de writes: 
On Samstag, 9. Januar 2021 23:38:35 CET Nigel gm8pzr via time-nuts wrote:
> I've dealt with this seller before, always been very happy with the results,
> and agreed a price on three such modules which arrived just before
> Christmas, for reference this particular Ebay ID was 333619130232, and
> finally found time to start checking them today. The modules themselves
> look very nice, but one of the auction photos is a connection diagram that
> shows Pin 2 of the 8 pin interface connector as "Power In 5V DC", and on
> this PCB that pin connects directly to the pin 6 Vcc input on the Ublox
> module, which has an absolute maximum rating of 3.6V ...whoops! This is
> not intended in any way to be a criticism of this seller, who I am more
> than happy to recommend, nor indeed of any other seller, but this is a
> generic diagram that several sellers are using for various Huawei/Ublox
> modules, some of which may have an onboard 3.3V regulator, as presumably
> did the one this diagram originally referenced, but some of which may not.

On a cursory look at the PCB, there are more odd details about it. The antenna 
circuitry and especially the bias-t looks wrong. The connection diagram lists 
a 5V pin for an antenna voltage supply and there seems to be a dedicated 
circuit for short/open circuit detection, but there's no DC blocking cap in 
the antenna feed line.

I'm starting to believe that this board was not originally designed for a LEA-
M8 at all. In fact it was probably made for a LEA-6T, the open/short antenna 
detection looks a bit like the circuit shown in figure 47 in the LEA-6 HIM. 
Also, the LEA-6 modules have an internal DC block in the antenna input so you 
would not need an external one.

Regards,
Matthias



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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Matthias Welwarsky]

On Samstag, 9. Januar 2021 23:38:35 CET Nigel gm8pzr via time-nuts wrote:
> I've dealt with this seller before, always been very happy with the results,
> and agreed a price on three such modules which arrived just before
> Christmas, for reference this particular Ebay ID was 333619130232, and
> finally found time to start checking them today. The modules themselves
> look very nice, but one of the auction photos is a connection diagram that
> shows Pin 2 of the 8 pin interface connector as "Power In 5V DC", and on
> this PCB that pin connects directly to the pin 6 Vcc input on the Ublox
> module, which has an absolute maximum rating of 3.6V ...whoops! This is
> not intended in any way to be a criticism of this seller, who I am more
> than happy to recommend, nor indeed of any other seller, but this is a
> generic diagram that several sellers are using for various Huawei/Ublox
> modules, some of which may have an onboard 3.3V regulator, as presumably
> did the one this diagram originally referenced, but some of which may not.

On a cursory look at the PCB, there are more odd details about it. The antenna 
circuitry and especially the bias-t looks wrong. The connection diagram lists 
a 5V pin for an antenna voltage supply and there seems to be a dedicated 
circuit for short/open circuit detection, but there's no DC blocking cap in 
the antenna feed line.

I'm starting to believe that this board was not originally designed for a LEA-
M8 at all. In fact it was probably made for a LEA-6T, the open/short antenna 
detection looks a bit like the circuit shown in figure 47 in the LEA-6 HIM. 
Also, the LEA-6 modules have an internal DC block in the antenna input so you 
would not need an external one.

Regards,
Matthias



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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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
 


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 
>  wrote:
> 
> H
> 
> 
> 
> 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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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Didier Juges]

For reference, my original Thunderbolt Monitor had a 3.3V CPU (3.6V max)
and a "voltage regulator" from the 5V consisting of two silicon diodes in
series. That worked very well. The original kit still runs, 10 years later.
When Fluke.l (of eBay fame) copied the design, he saved the cost of the two
diodes (under $0.05 in his local money) by replacing them with two 0 Ohm
resistors (under $0.01).  He sold a truck load of them. I know because he
gave my email for customer service (!!!), even though I was not aware that
he was selling those and was certainly not making even $0.01 off the deal.

Well, they worked for a while, at least 20 minutes and a few ran for
several hours.

So, in the case of the M8T GPS module, you might get lucky and not fry the
kit instantly, but as always YMMV.

Didier KO4BB

NB: a few years later, another eBay seller also copied my design but he did
put the diodes, so I did not hear about it for a long while, that is until
someone asked me for the firmware upgrade to take care of the GPS Week
rollover. When I asked where he got the kit, he sent me a link. The vendor
had listed my website for manual and support...

On Sat, Jan 9, 2021 at 5:23 PM Bob kb8tq  wrote:

> 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
>
> > On Jan 9, 2021, at 5:38 PM, Nigel gm8pzr via time-nuts <
> time-nuts@lists.febo.com> wrote:
> >
> > During the December conversation re LEA-M8T modules on scraps of PCB
> from Ebay I commented that the same seller also had complete circuit boards
> available, and suggested this might be a worthwhile alternative.
> >
> > I've dealt with this seller before, always been very happy with the
> results, and agreed a price on three such modules which arrived just before
> Christmas, for reference this particular Ebay ID was 333619130232, and
> finally found time to start checking them today.
> > The modules themselves look very nice, but one of the auction photos is
> a connection diagram that shows Pin 2 of the 8 pin interface connector as
> "Power In 5V DC", and on this PCB that pin connects directly to the pin 6
> Vcc input on the Ublox module, which has an absolute maximum rating of 3.6V
> ...whoops!
> > This is not intended in any way to be a criticism of this seller, who I
> am more than happy to recommend, nor indeed of any other seller, but this
> is a generic diagram that several sellers are using for various
> Huawei/Ublox modules, some of which may have an onboard 3.3V regulator, as
> presumably did the one this diagram originally referenced, but some of
> which may not.
> >
> > So that's the warning folks, don't trust that diagram without checking!
> > Now a question, supposing someone did follow that diagram and applied 5
> Volts to Vcc on the M8T, what is the risk of damage and would it be
> immediately obvious?
> > And no, I didn't:-), but when modules are described as tested concern
> might arise as to the test conditions.
> > Nigel GM8PZR
> > ___
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>
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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bryan _]

Thanks for sharing, I purchased one of the scrap modules, not the PCB mounted 
ones. Good catch, but if I understand your post the error is in the schematic 
but not the actual boards themselves. I see no schematic in the listing (maybe 
removed). If the boards are faulty I would have thought there would be a lot of 
negative feedback.

And correct the seller is very good, fast shipping and items are as described.

-=Bryan=-


From: time-nuts  on behalf of Nigel gm8pzr 
via time-nuts 
Sent: January 9, 2021 2:38 PM
To: time-nuts@lists.febo.com 
Cc: gandal...@aol.com 
Subject: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

During the December conversation re LEA-M8T modules on scraps of PCB from Ebay 
I commented that the same seller also had complete circuit boards available, 
and suggested this might be a worthwhile alternative.

I've dealt with this seller before, always been very happy with the results, 
and agreed a price on three such modules which arrived just before Christmas, 
for reference this particular Ebay ID was 333619130232, and finally found time 
to start checking them today.
The modules themselves look very nice, but one of the auction photos is a 
connection diagram that shows Pin 2 of the 8 pin interface connector as "Power 
In 5V DC", and on this PCB that pin connects directly to the pin 6 Vcc input on 
the Ublox module, which has an absolute maximum rating of 3.6V ...whoops!
This is not intended in any way to be a criticism of this seller, who I am more 
than happy to recommend, nor indeed of any other seller, but this is a generic 
diagram that several sellers are using for various Huawei/Ublox modules, some 
of which may have an onboard 3.3V regulator, as presumably did the one this 
diagram originally referenced, but some of which may not.

So that's the warning folks, don't trust that diagram without checking!
Now a question, supposing someone did follow that diagram and applied 5 Volts 
to Vcc on the M8T, what is the risk of damage and would it be immediately 
obvious?
And no, I didn't:-), but when modules are described as tested concern might 
arise as to the test conditions.
Nigel GM8PZR
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[time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Nigel gm8pzr via time-nuts]

H



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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Re: [time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Bob kb8tq]

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

> On Jan 9, 2021, at 5:38 PM, Nigel gm8pzr via time-nuts 
>  wrote:
> 
> During the December conversation re LEA-M8T modules on scraps of PCB from 
> Ebay I commented that the same seller also had complete circuit boards 
> available, and suggested this might be a worthwhile alternative.
> 
> I've dealt with this seller before, always been very happy with the results, 
> and agreed a price on three such modules which arrived just before Christmas, 
> for reference this particular Ebay ID was 333619130232, and finally found 
> time to start checking them today.
> The modules themselves look very nice, but one of the auction photos is a 
> connection diagram that shows Pin 2 of the 8 pin interface connector as 
> "Power In 5V DC", and on this PCB that pin connects directly to the pin 6 Vcc 
> input on the Ublox module, which has an absolute maximum rating of 3.6V 
> ...whoops!
> This is not intended in any way to be a criticism of this seller, who I am 
> more than happy to recommend, nor indeed of any other seller, but this is a 
> generic diagram that several sellers are using for various Huawei/Ublox 
> modules, some of which may have an onboard 3.3V regulator, as presumably did 
> the one this diagram originally referenced, but some of which may not.
> 
> So that's the warning folks, don't trust that diagram without checking!
> Now a question, supposing someone did follow that diagram and applied 5 Volts 
> to Vcc on the M8T, what is the risk of damage and would it be immediately 
> obvious?
> And no, I didn't:-), but when modules are described as tested concern might 
> arise as to the test conditions.
> Nigel GM8PZR
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[time-nuts] Ebay Huawei Ublox M8T Modules Warning

[Nigel gm8pzr via time-nuts]

During the December conversation re LEA-M8T modules on scraps of PCB from Ebay 
I commented that the same seller also had complete circuit boards available, 
and suggested this might be a worthwhile alternative.

I've dealt with this seller before, always been very happy with the results, 
and agreed a price on three such modules which arrived just before Christmas, 
for reference this particular Ebay ID was 333619130232, and finally found time 
to start checking them today.
The modules themselves look very nice, but one of the auction photos is a 
connection diagram that shows Pin 2 of the 8 pin interface connector as "Power 
In 5V DC", and on this PCB that pin connects directly to the pin 6 Vcc input on 
the Ublox module, which has an absolute maximum rating of 3.6V ...whoops!
This is not intended in any way to be a criticism of this seller, who I am more 
than happy to recommend, nor indeed of any other seller, but this is a generic 
diagram that several sellers are using for various Huawei/Ublox modules, some 
of which may have an onboard 3.3V regulator, as presumably did the one this 
diagram originally referenced, but some of which may not.

So that's the warning folks, don't trust that diagram without checking!
Now a question, supposing someone did follow that diagram and applied 5 Volts 
to Vcc on the M8T, what is the risk of damage and would it be immediately 
obvious?
And no, I didn't:-), but when modules are described as tested concern might 
arise as to the test conditions.
Nigel GM8PZR
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