Issue: With my external antenna design, I get lower dbm than PCB antenna (nRF51DK) with same distance.
My external antenna design: -70dbm
nRF51DK: -40dbm
In this answer, you mentioned it's possible to use an external antenna for nRF51422.
I use your hardware design document as reference and an U.FL. socket for external antenna connection.
Here are the links for the cable and antenna I'm currently using: Cable , External Antenna
Here is my design:
I'm a software developer instead of a professional electrical engineer.
Could you provide some guidance? I really appreciate that.