The RCB-F9T is definitely something *not* to emulate -- it uses an SMB
connector for the antenna (which no one else does) and it only has a 10
pin header (on 2mm, not 2.54mm spacing) that provides only one TIMEPULSE
output and no EXTINT inputs. Why u-blox decided that was a good form
factor is beyond me.
You might take a look at the Sparkfun carrier boards. They seem well
thought out.
I've also done a ZED-F9T/P carrier board that I'd be happy to share
designs for; it's the opposite of the RCB in that it makes *everything*
accessible. I'll try to get the design files on my github
(github.orb/n8ur) later today.
Note that the ZED-F9 chips have multiple ground pads under the chip and
can't be hand soldered; you'd need to use an oven.
John
----
On 6/3/21 11:09 AM, John Miller via time-nuts wrote:
Hello Everyone!
I am interested in designing a Pi hat PCB to be compatible with a timing GPS
PCB design that I have seen used in a number of places. I have found an “okay”
digram, but if anyone has already made gerbers for this thing, I would greatly
appreciate it.
- Diagram: https://files.millerjs.org/misc/timing_board_PCB.jpg
<https://files.millerjs.org/misc/timing_board_PCB.jpg>
- LEA-M8T using this format: https://files.millerjs.org/misc/LEA_M8T.png
<https://files.millerjs.org/misc/LEA_M8T.png>
- Trimble Resolution T: https://files.millerjs.org/misc/trimble_resolution_t.png
<https://files.millerjs.org/misc/trimble_resolution_t.png>
Even the relatively new uBlox RCB-F9T uses it, calling it an “industry standard form
factor” : https://www.u-blox.com/en/product/rcb-f9t-timing-board
<https://www.u-blox.com/en/product/rcb-f9t-timing-board>
In the RCB-F9T documentation they have a very nice diagram of the module that surely
came out of something like Altium, but I can’t find any files to replicate it -
https://files.millerjs.org/misc/RCB_F9T.png
<https://files.millerjs.org/misc/RCB_F9T.png>
Any help would be greatly appreciated, I think one of the biggest things
holding me back here is that I simply don’t know what this form factor is
called.
Thanks in advance!
John
PS - My plan, once I get a hat design that works, is to make a mess of these
PCBs and mail them out to everyone on this list that wants one for the cost of
shipping.
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