How is it possible the on pcb antenna version (WROOM02) connects better than the external antenna version (WROOM02U)?

[sarpdaltaban]

Hello all,

I have tested both the on antenna version ESP-WROOM-02 and the external antenna version ESP-WROOM-02U.

How is it possible the pcb antenna version (ESP-WROO-02) is more successful than external antenna version(ESP-WROOM-02U) in terms of connectivity?

I have applied AT+RFPOWER=82 for both modules and the same test which consists same access points for the internet and same servers.

I have attached the suggested antenna and realized that the on pcb antenna module has a better connectivity.

Any help is appreciated

Kind Regards

[WiFive]

Did you force calibration with antenna attached by erasing flash or setting always calibrate mode?

[sarpdaltaban]

No, I didn't.

[WiFive]

Wroom-02 uses esp8266 so go here for support https://bbs.espressif.com/