[time-nuts] Ublox 8T - breakout board

Sat Dec 12 08:49:55 UTC 2020

On Samstag, 12. Dezember 2020 00:42:11 CET Bryan _ wrote:
> What is the difference between the LEA vs NEO variants other than
> mechanical, electrical specifications. Is one better for using as a GPSDO.

The LEA module has a built-in antenna bias circuit, you get a simple antenna 
supervisor with just two external components. Apart from that they're using 
the same core chipset.

I've attached the schematic for the LEA-M8 breakout board I'm doing for my own 
purposes, the PCB is mostly ready, I'm just touching it up a bit to make it 
look more tidy.

I plan to have it assembled using JLCPCBs SMT service, if any of you want to 
tug along, I'll provide the BOM and part placement file together with the 
gerbers so that it can be easily ordered.

I have some constraints regarding the connectors and some mounting holes and 
overall size, but there's some space on the PCB left for small additions 
should any of you have sensible suggestions.

About the only task left is to find a suitable LDO in their catalog. JLC have 
recently up'd MOQ for many of their parts and they're also charging for 
attrition. The LDO I was using before suddently costs $5 in small quantities. 
I'll have to find a replacement.

BR,
Matthias

> 
> -=Bryan=-
> 
> ________________________________
> From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of Arnold Tibus
> <arnold.tibus at gmx.de> Sent: December 11, 2020 2:08 PM
> To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Ublox 8T
> 
> Many thanks to all the timenuts for these interesting informations
> concerning *M8T* and for all other good ideas.
> 
> My bad, I did not look careful enough to realize that in the ebay
> offer mentioned is not a *NEO* M8T but a *LEA* and I did order 2 units
> ... Fortunately that is not expensive. (Thank you Matthias, I did not
> know the difference before!).
> 
> No I do not want to build my own module, I do have another problem.
> When I bought years ago a professional replacement board from a well
> known US-company equipped with the LEA-M8T I got it delivered with the
> 1st firmware which is not yet capable to work correct with GALILEO
> Satellites which I want to receive as well.
> 
> The next bad point is, here in Germany I cannot get the new firmware to
> update the module (I had asked the representative for M8T). Sending it
> back and forth to the US-Company (insured an then on top the customs
> problem) is far out to be interesting ... so I falled into the trap with
> this offer. I thought to exchange just the receiver on the boards ...
> Perhaps somewhen I will find the correct new firmware to load onto the
> old original *NEO-M8T* ...
> 
> In meantime I will continue working with my good old Thunderbolt.
> 
> Many thanks to everybody
>   and good and healthy Xmas Time
> and good luck for all your projects!
> 
> Arnold, DK2WT
> 
> Am 10.12.2020 um 10:04 schrieb Matthias Welwarsky:
> > Dear all,
> > 
> > If you go shopping for existing breakout boards:
> > 
> > The ebay listing is for the *LEA-M8T*. It is mechanically and electrically
> > different from the *NEO-M8T*.
> > 
> > BR,
> > Matthias
> > 
> > On Montag, 7. Dezember 2020 14:25:35 CET ew via time-nuts wrote:
> >> With not much happening on Ublox 9T I went back looking at 8T in support
> >> for Jim Harnan's next generation GPSDO.. Shopping on ebay I ran across
> >> this super deal. No financial interest but we have bought from him
> >> repeatedly no problem. There is a reason he has 100%.. We have offered $
> >> 15 for three each all accepted.                                         
> >>    Bert Kehren
> >> 
> >> 
> >> https://www.ebay.com/itm/ON-SALE-1-U-BLOX-ublox-LEA-M8T-0-10-HUAWEI-GPS-M
> >> od
> >> ule/333753811808?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l26
> >> 49
> >> 
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