Description: - 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. Features: - 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& 39;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 Note: 1. Hardware version 1.0, software version 1.4.17 2. Without shell 3. Not include the raspberry pi 4. The firmware is pre-loaded.Please do not upgrade the firmware by yourself. Package Included: MMDVM Hotspot Module +OLED +2 Antennas