whc2001
commented
3 years ago Nevermind, I measured it myself:
- The distance of the center of the through hole to the short side is 6.25mm
- The distance of the center of the through hole to the long side is 3.85mm
- The diameter of the through hole is 1.1mm
There is another test pad near the antenna pad, but seems like it's connected directly to GND so I didn't measure it.
Firstly thanks for posting the details of the design! Currently I am trying to build myself a version with RS232 port and external antenna based on your "RPi shield" design. However seems like I am not able to find any detail about the testing pad connected to the antenna output under the module. As I am going to make a larger board I am not able to use the "SMA connect directly rides on the PCB antenna trace with solder mask scratched" method. On your design I can see that you made a though hole exactly to that pad and fill it with solder when assembling, in order to break it out to external antenna, and cut the PCB antenna. I have contacted EByte official but they only have the drawing of GPIO pins around the module, but not that test pad. Could you please share the footprint you used for that?