[time-nuts] Re: RCB-F9T Adapter PCB with USB and 50 Ohm Timepulse SMA Connectors -- Update: EDA files on Github

[Carsten Andrich]

Hello everyone,

while I've had the boards manufactured last September, they've been 
sitting on my desk ever since. Finally got to testing them. Except for a 
minor mishap with the RCB-F9T's RST pin (which is actually an NRST), the 
design works as planned.

As promised, I've released the KiCAD files on Github: 
https://github.com/carstenandrich/Adapter_RCB_F9T

Best regards,
Carsten

On 21.08.22 18:49, Carsten Andrich wrote:
> Hi,
>
> I've designed an adapter board for u-blox' RCB-F9T breakout board for 
> the ZED-F9T timing GNSS receiver. Primary design goal was to improve 
> upon the RCB-F9T's interface situation (only 2.0 mm 2x4 pin header for 
> UART and time pulse outputs). My adapter PCB's interfaces are micro 
> USB (connected to the ZED-F9T UART via a SiLabs CP2102 USB-to-UART 
> bridge) and two SMA connectors with 50 Ohm source impedance capable of 
> driving a 50 Ohm load (via a TI BUF602 buffer opamp).
>
> Since quite a few of us seem to be using the RCB-F9T, I wanted to put 
> my adapter PCB up for review before I have it manufactured. While I 
> will not take orders for the board, anyone interested could order it 
> from a fab house of their choice. Therefore, I'm interested in minor 
> changes that could make it usable for more of us. I'll release the 
> design files (KiCad) and gerbers once I've verified the design is 
> functional.
>
> I've attached schematic, layout, and two 3D renderings. The latter 
> hopefully illustrate how the RCB-F9T neatly plugs on top of the 
> adapter board. The adapter PCB is the same width as the RCB-F9T and 
> ~16 mm longer to accommodate the SMA side-mount connectors.
>
> Best regards,
> Carsten