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:
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 <[email protected]> on behalf of Arnold Tibus
<[email protected]> Sent: December 11, 2020 2:08 PM
To: [email protected] <[email protected]>
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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