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
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
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.
Ideally the coax buffer would be something like 4 or so ‘125 buffers in
May I suggest adding another SMA connector for the timepulse signal.
Perhaps route the timepulse trace to the SMA first then to the DIP
header. This would allow you to cut the trace to the DIP header. This
might improve signal integrity.
Pete.
On 12/12/2020 3:49 AM, Matthias Welwarsky wrote:
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