[time-nuts] Ublox 8T

[Matthias Welwarsky]

On Mittwoch, 9. Dezember 2020 21:46:25 CET Philip Gladstone 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.

That's what I typically do as well. But you don't need a lot of support 
components for a M8T, it's almost not worth it. Effectively, you have

3 parts for the antenna power feed-in
1 decoupling cap for the module itself
1 resistor or ferrite bead for each signal you need to break out
3(4) parts for the power supply (LDO)

USB needs just a few more parts, two resistors, a protection chip and a 
receptacle.


> 
> 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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