I'm thinking on putting a higher gain antenna (other than the trace antenna). I know I need a Rf Coax Connector and it looks like I have to close SJ2. Is that all that's required? Do I need to lift C5?
Been 5 days, no response from tech support. Lots of views. I guess I just have to experiment.
Did you manage to connect the external antenna? Any component that you had to remove for disabling the PCB one?
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You also need to remove the C5 capacitor. So, in total, you need to close SJ2 jumper and remove C5 capacitor. Soldering SJ2 together - enables the external antenna pads; and removing C5 capacitor disconnects the built-in PCB antenna. Refer to the schematic for better understanding: https://github.com/OLIMEX/ESP8266/blob/master/HARDWARE/MOD-WIFI-ESP8266-DEV/MOD-WiFi-ESP8266-DEV%20revision%20B1/MOD-WiFi-ESP8266-DEV_Rev_B1.pdf
The external antenna should be connected to the "ANT_CON" connector (find the white print on top of the boards).
There are a lot of sources that describe suitable antennas for ESP8266. Make sure to check some of these sources available online.