[time-nuts] Ublox 8T

[Bob kb8tq]

Hi

I’ve used them as well. They are indeed *very* inexpensive and deliver quite
good assembly on the boards. As with any assembly process, avoiding ultra
small caps and resistors ( 0201 … 0402 …) will improve your chances.  I have seen
zero issues with parts in the 0603 and larger range. I have not seen any IC’s or
semiconductors with issues.

Bob

> On Dec 9, 2020, at 3:46 PM, Philip Gladstone <pjsg-timenuts at nospam.gladstonefamily.net> wrote:
> 
> I have used the assembly service from jlcpcb a few times for small runs --
> it is absurdly cheap *if* you are using common surface mount components and
> cheap for the less common ones. I then hand solder the connectors on when I
> get the boards.
> 
> Philip
> 
> On Wed, Dec 9, 2020 at 3:27 PM Matthias Welwarsky <time-nuts at welwarsky.de>
> wrote:
> 
>> On Mittwoch, 9. Dezember 2020 14:57:55 CET Bob kb8tq wrote:
>>> Hi
>>> 
>>> I think the key point is:
>>> 
>>> *IF* somebody wants to do a layout using the M8T, Bert already *has* a
>>> “known good” PCB layout footprint in his inventory of useful stuff. Since
>>> the uBlox is a really odd part, you aren’t going to find that footprint
>>> built into the standard layout programs.
>> 
>> I have a known-good footprint and symbol for KiCAD, if anyone is
>> interested. I
>> also have KiCAD project for a small breakout board. It's not too
>> featureful,
>> no antenna power switching or monitoring, no support for antenna power
>> other
>> than from the built-in LDO. However, it has been successfully used in a
>> GPSDO
>> project. All components are hobbyist-friendly 0805, except for a LDO with
>> SOT-23-5 footprint.
>> 
>>> 
>>> Bob
>>> 
>>>> On Dec 8, 2020, at 6:26 PM, Bill Notfaded <notfaded1 at gmail.com> wrote:
>>>> 
>>>> That's a really old board though.  An 8 series isn't pin compatible
>> with
>>>> say LEA-6T is it?  The picture had a 5 series in it.
>>>> 
>>>> Could you use something like this?
>>>> 
>> https://github.com/PaulZC/NEO-M8T_GNSS_FeatherWing/blob/master/LEARN.md
>>>> 
>>>> Bill
>>>> 
>>>> On Tue, Dec 8, 2020, 10:30 AM Gregory Beat via time-nuts <
>>>> 
>>>> time-nuts at lists.febo.com> wrote:
>>>>> There are various Breakout (bare) Boards for the uBlox modules posted
>> on
>>>>> Internet.
>>>>> SparkFun has carried them, in the past, and sometimes sold the bare
>>>>> boards
>>>>> without the uBlox module.
>>>>> https://www.sparkfun.com/products/15005
>>>>> 
>>>>> StuartsProjects (Stuart Robinson, Cardiff, UK) has a bare board for
>> the
>>>>> Ublox MAX M8Q module.  Sold on Tindie, used in high-altitude balloon
>>>>> projects.
>>>>> 
>>>>> 
>> https://www.tindie.com/products/stuartsprojects/ublox-max-8mq-gps-breakou
>>>>> t-board-x-2/
>>>>> 
>>>>> Contact Limor “Ladyada” Fried at Adafruit, she might have bare boards
>> OR
>>>>> Gerbers for earlier or future products.
>>>>> https://www.adafruit.com/?q=gps+breakout&p=1&sort=BestMatch
>>>>> 
>>>>> Dan Watson designed one, for the 6-series five years ago.
>>>>> He sometimes posted Gerber files.
>>>>> 
>>>>> 
>> http://syncchannel.blogspot.com/2015/09/a-nearly-perfect-u-blox-gps-break
>>>>> out.html
>>>>> 
>>>>> greg
>>>>> w9gb
>>>>> ==
>>>>> Date: Mon, 7 Dec 2020 09:47:55 -0500
>>>>> From: paul swed <paulswedb at gmail.com>
>>>>> To: Discussion of precise time and frequency
>>>>> 
>>>>>  measurement <time-nuts at lists.febo.com>
>>>>> 
>>>>> Subject: Re: [time-nuts] Ublox 8T
>>>>> 
>>>>> Bert Very attractive price. They appear to be on a cut out circuit
>> board.
>>>>> How are you connecting to them please?
>>>>> Regards
>>>>> Paul.
>>>>> WB8TSL
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>> 
>> 
>> 
>> 
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