Per Raspberry Pi Zero W 0W 2W 3B+ 4B 4B+ scheda hotspot MMDVM duplex UHF VHF
1 Duplex MMDVM hotspot board (excluding other products). Radio Frequency : in duplex mode,support uhf 430-440MHZ, in simplex mode support both uhf 430-440MHz and vhf 140-150MHz. Then the file “wpa_supplicant.