4 20 2 40 July 8, 2019 16 32 64 128 4 40 or 2 20 license 4 40 to 2 20 conversion 4 hours 20 minutes 2 hours 40 minutes 4 40 to 2 20 conversion course Cortina 4 20 x 2 40 Wlan 2 4 20 oder 40 mhz
