Hi
If you are looking at the “raw” output of the uBlox, it is not designed to drive
a low impedance. Even if there is a buffer, it may or may not like a low
impedance
load.
Bob
> On Dec 31, 2020, at 7:39 PM, Matthias Welwarsky
> wrote:
>
> Happy New Year, Peter.
>
> If you get the chance,
Happy New Year, Peter.
If you get the chance, would you also have a look at the buffered 1PPS signal?
I received my boards meanwhile and after mounting the LEA module I connected
the 1PPS output to a scope to measure the signal rise time. I'm getting around
6ns for the 10%-90% rise and the outp
Quick heads-up for everyone who might have ordered the breakout board based on
design files I uploaded to github before Dec. 28th.
As Peter Bell found out, the voltage divider that provides VDD_USB to the LEA
module is not adequate, the impedance is way too high and since the current
drawn by t
Just a quick note for anyone building these - I got my boards back and
assembled them
and everything works except for the USB port. This is being caused by the
VDD_USB
pin being fairly low-impedance and dragging down the voltage of the R7/R9
potential
divider to about 700mV, at which point the mod
I ordered some too for reduced offer price. BTW the seller is a she not a
he in case you're interested. QUEEN*S_LAND is definitely a girl. I've
seen her picture before. I'm interested in what you all come up with using
these. I've bought a lot of stuff from her and she ships quickly.
Bill
On
Quick vote of confidence in case anyone's still considering buying any of
these (and in case there are any left - I haven't checked): I ordered two
on December 8th; they shipped with a tracking number on the 9th; and they
arrived in excellent condition on the 24th. Won't have a chance to play
with
Yes you did the right thing. I am a drop it in the drawer person.
Hate when those batteries make a bang.
On Tue, Dec 15, 2020 at 5:06 PM Matthias Welwarsky
wrote:
> On Dienstag, 15. Dezember 2020 19:22:14 CET paul swed wrote:
> > Hello to the group Nigel is correct the way the schematic is drawn
On Dienstag, 15. Dezember 2020 19:22:14 CET paul swed wrote:
> Hello to the group Nigel is correct the way the schematic is drawn the
> Regulator will feed the battery and most likely cause it to burst.
> It should be 1 diode in series with the regulator and 1 in series with the
> battery so that t
Hello to the group Nigel is correct the way the schematic is drawn the
Regulator will feed the battery and most likely cause it to burst.
It should be 1 diode in series with the regulator and 1 in series with the
battery so that the regulator can not charge the battery.
Nice design you have created
On Dienstag, 15. Dezember 2020 13:57:48 CET Matthias Welwarsky wrote:
> Time-nuts,
>
> I've updated the repository on github with the latest design files. The
> breakout board is now final as far as I'm concerned.
Common wisdom: nothing is ever "final". After some off-list discussion, I
changed
Should not D5 be connected on the + of the battery?
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Hi Mathias,
I'm assuming you're using a coin cell for back up, so wondering if one of the
diodes shouldn't be in series with the battery, with both cathodes to V_BCKP?
Nigel GM8PZR
I've updated the repository on github with the latest design files. The
breakout board is now final as far as I'm
On Dienstag, 15. Dezember 2020 14:21:07 CET Peter Reilley wrote:
> May I suggest not populating the DIP header. If it is put on top of
> the board then that prevents it from being plugged into another
> board, the SMA connectors get in the way.
No worries, the assembly process, if done by JLCPCB
May I suggest not populating the DIP header. If it is put on top of
the board then that prevents it from being plugged into another
board, the SMA connectors get in the way.
If you want to use the board separately then the DIP can be put on
the top. If you want to plug your board into another
That's excellent, will you by chance be making the printed circuit board design
public?
-=Bryan=-
From: time-nuts on behalf of Matthias
Welwarsky
Sent: December 12, 2020 12:49 AM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] Ublox 8T - breakout
Since the proposed board is not too dense you can provide the pads
for the SMA connector and driver circuitry and don't populate them
if you don't need that feature. But this is the time-nuts group so I
think that a lot of people would be interested in the PPS output.
Why would you get a uBlox "
Hi
The issue with coax becomes:
Do you want to drive a terminated line?
On a board built for a single application, you likely know the answer to that
and can
design appropriately. On a general purpose board, you probably need to allow for
the “worst case” configuration ( = terminated). No, tha
On Samstag, 12. Dezember 2020 14:40:11 CET Bob kb8tq wrote:
> Hi
>
> If you are going to drive much with the timepulse output, you will need to
> buffer it. This is true for just about any practical length of coax. It also
> applies to other cables once they get past the “few inches” range.
>
> I
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
>>
>>&g
in small quantities.
I'll have to find a replacement.
BR,
Matthias
-=Bryan=-
From: time-nuts on behalf of Arnold Tibus
Sent: December 11, 2020 2:08 PM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] Ublox 8T
Many thanks to all the timenuts for these interest
Just a thought re these LEA-M8T modules, but I don't recall seeing any previous
mention that the
same seller also has two other items with them still mounted on an interface
board, these are
Ebay items 33619130232 and 333820728021.
Yes, they're more expensive, but perhaps the extra convenience
Thanks Bob, for what the seller is asking might be worth picking one up to play
with.
-=Bryan=-
From: time-nuts on behalf of Bob kb8tq
Sent: December 11, 2020 5:08 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Ublox 8T
Sorry Bert, sorry for the confusion,
that is a typing error on my side, the replacement-board I have from the
US company is equipped with *NEO-M8T* !
Arnold, DK2WT
Am 12.12.2020 um 00:31 schrieb ew via time-nuts:
First we do not know how old the units are on ebay, second you say your board
h
echanical,
> electrical specifications. Is one better for using as a GPSDO.
>
> -=Bryan=-
>
>
> From: time-nuts on behalf of Arnold Tibus
>
> Sent: December 11, 2020 2:08 PM
> To: time-nuts@lists.febo.com
> Subject: Re: [time-nuts] Ublox 8T
&
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
First we do not know how old the units are on ebay, second you say your board
has LEA and what does NEO have to do with it. If we find out that these units
are old I am sure time nuts will find an answer and you will be able to update
the units you bought.
Arnold,
if you're looking for a Galileo capable firmware for the *NEO*-M8T:
https://www.eevblog.com/forum/metrology/u-blox-m8t-firmware-fw-3-01-tim-1-10/
msg2528250/#msg2528250
BR,
Matthias
On Freitag, 11. Dezember 2020 23:08:38 CET Arnold Tibus wrote:
> Many thanks to all the timenuts for the
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
Hi
If you *do* get some of these:
The uBlox modules are soldered together internally with very normal
solder and processes. The board conducts heat pretty well. Getting the
module off the board without disturbing the internal parts or pads on the
module can be a bit tricky …..
Bob
> On Dec 10,
On Wed, Dec 9, 2020 at 7:47 AM Bill Notfaded 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.
>
Most of the pads are the same - if you aren't using the SPI interface you
should be able to drop the M8T into
a
Bob oh the ole dead bug is absolutely an option. Don't need LNA power so
that makes everything even easier. I think there are numbers of grounds.
But was hoping for a nice little PCB. Was going to buy several of the units
but by the time on the same day I went to order magically they went up $5
eac
HI
In a “typical” use case ( it’s TimeNuts … typical ? ) there are a lot of the
pads on the part that simply hang loose. More or less, power / antenna / serial
and you are good go go. The other 80% or so of the pads can just hang open.
You *could* dead bug the thing ….
Bob
> On Dec 10, 202
Be careful NEO and LEA packages are not even close
As they say never mind. The 8 T has 1 more pin on each group.
Regards
paul
On Thu, Dec 10, 2020 at 5:16 PM paul swed wrote:
> Hello to the group and it sounds like someone could create some empty
> boards.
> But I am curious. I looked at Allibaba and see that ublox NEO6 boards are
> available fo
Hello to the group and it sounds like someone could create some empty
boards.
But I am curious. I looked at Allibaba and see that ublox NEO6 boards are
available for little cost. Have not looked at the pinouts of the 8T to
compare but might it be a case of removing a neo6 and replacing it with a
8T
Hi
I’ve looked at several “you supply the components” outfits. Each time I’ve dug
into it,
the mechanics of supplying an adequate number of parts has been pretty
daunting.
None of the things I do is very “high volume” ( 10 is a lot of boards for me ).
Bob
> On Dec 10, 2020, at 9:21 AM, Mark
If you have some volume, consider Small Batch Assembly:
https://www.smallbatchassembly.com/
They are not as cheap as the Chinese suppliers, but you can provide
your own components, and it is run by a very helpful gentleman in the
Washington DC area. I got the bare boards from OshPark and you can
Hi
If you have a board with many dozens of passive parts on it and
four or five IC’s getting all those passives down on the board *is*
very useful. Their price on typical passive parts is low enough that
the delivered cost is still very close to a bare board.
If you do use odd IC’s you have to m
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 lo
On Mittwoch, 9. Dezember 2020 23:58:51 CET Bob kb8tq wrote:
> One note: JLPCB is the only “fab + assembly” outfit I’ve tried. Their boards
> are no better / no worse than a lot of other board fab outfits. I have no
> idea how they compare to other assembly houses. My selection criteria: “
> are the
on
> >>>
> >>>>>> Internet.
> >>>>>> SparkFun has carried them, in the past, and sometimes sold the bare
> >>>>>> boards
> >>>>>> without the uBlox module.
> >>>>>> https://www.sparkfun.com/
ule.
>>>>>> https://www.sparkfun.com/products/15005
>>>>>>
>>>>>> StuartsProjects (Stuart Robinson, Cardiff, UK) has a bare board for
>>>
>>> the
>>>
>>>>>> Ublox MAX M8Q module. Sold on Tindie,
> >
> > 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
> >
> > >
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 Adafr
>> 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.
> > &g
it, 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.
> >>
>
fruit.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-breakout.html
>>
>> greg
>>
annel.blogspot.com/2015/09/a-nearly-perfect-u-blox-gps-breakout.html
>
> greg
> w9gb
> ==
> Date: Mon, 7 Dec 2020 09:47:55 -0500
> From: paul swed
> To: Discussion of precise time and frequency
>measurement
> Subject: Re: [time-nuts] Ublox 8T
>
> Bert Very attr
scussion of precise time and frequency
measurement
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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Let me clarify I will not make boards. I am willing to work with some one off
list and design a board and make a Gerber file. Since I have done an Ublox
board before {attached} I have the Ublox part on file it is the tricky part.
That board works. Should also be willing to review 8T datasheet so
If some one wants to make a breakout board or Saw tooth get with me off list
Bert Kehren
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Agree
But considering you mentioned it, thats very attractive. Considering a
couple just to play with.
Regards
Paul
On Mon, Dec 7, 2020 at 10:33 AM ew wrote:
> Normally such a price would be suspicious but cut outs from Huawai reduces
> the risk.
>
>
> In a message dated 12/7/2020 10:26:52 AM Ea
Normally such a price would be suspicious but cut outs from Huawai reduces the
risk. In a
message dated 12/7/2020 10:26:52 AM Eastern Standard Time, paulsw...@gmail.com
writes:
OK I was wondering how to handle that.Thank you.R
OK I was wondering how to handle that.
Thank you.
Regards
Paul.
On Mon, Dec 7, 2020 at 10:22 AM ew wrote:
> We will remove them with a heat source and use them on designs we already
> have and tested with 5T and 6T like GPSDO and a Saw tooth correction board
> using the DS 1023- 25 for delay
>
We will remove them with a heat source and use them on designs we already have
and tested with 5T and 6T like GPSDO and a Saw tooth correction board using the
DS 1023- 25 for delay
Bert Kehren
Bert Very attractive price. They appear to be on a cut out circuit board.
How are you connecting to them please?
Regards
Paul.
WB8TSL
On Mon, Dec 7, 2020 at 9:14 AM 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 generati
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
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