After installing Raspbian on a new Pi3 I checked wlan0 for existing SSIDs.
A few were visible plus the wifi accesspoint of my LAN.
For several reasdions I reinstalled Raspbian but since then I cannot see my SSID anymore.
Other SSID's are visible, so the wlan works so far, however my SSID is not visible.
Another wifi device placed right next to pi 3 receives my WLAN w/o issues, so a dead spot is not the problem.
I placed Pi3 a few feet next to the access point, but without success, my SSID is not visible.
Changing 'Region' (TP-Link Archer C20i dual band) from 'Austria' to 'United States', my SSID is visible with Link Quality=61/70 Signal level=-49 dBm.
However, the 5Ghz band is not visible.
US Region allows up to 1W, most EU countries up to 100mW.
Is it possible that the pi3 wlan chip (BCM43143) is defect?