How to set different radio channel for _ext wlan ?

Gammaware wrote:

Hi all ! My main router i quite far from my extender and actually I cannot have the network extended. I notice that the _ext wlan is located at the same channel of the main. Wlan. This cause interference if the main wlan it is not enough strong. Notice that i can see the main wlan during the setup but in the final step the wn1000rp Continue to ask to bring the extender closer to the main router. I got how to change the _ext ssid and relative security protocol but the radio channel is set in grey (auto) and no way to change it. Any hint welcome ! Regards Giulio