High performance 32-bit ARM processor Fully tested Supports DMR, P-25,D-Star and System Fusion Onboard LEDs to show status (Tx,Rx,PTT,Mode) Up to 10mW RF power SMA antenna connector,Antenna included Mounts cleanly on all current Raspberry Pi's including the Pi Zero The firmware is pre-loaded and is easily upgraded via software. Open source 3D printable case available UHF 430-450 MHz,433mhz and 900MHz VHF 144 220 Opera FREQ Duplex variant of MMDVM_HS_Hat This PCB uses the MMDVM_HS . It has two ADF7021 onboard and allows for duplex operation with two time slots on DMR. An accidentially deleted 3v3 wire has been added back to the PCB layout. BOM, Mouser cart and stencil stay the same as for rev1.1. The upper part is TX,the lower is RX antenna. UHF+VHF SMA,antenna Modem select: STM32_HS_GPIO Set TX frequency,RX frequency TX,RX frequency had better 10M or more apart. SLOT1,SLOT2 support. Colour: as shown Material:PC+metal