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.The default bit error rate is less than 5%, and the default 0ffset is 0. If the bit error rate is more than 5%, as long as the signal can be received, it can be corrected by 0ffset.Features:

- 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.- UHF 430-450 MHz,433mhz and 900MHzVHF 144 220 Opera FREQ:The upper part is TX,the lower is RX antenna.UHF+VHFSMA,antennaModem select: STM32_HS_GPIOSet TX frequency,RX frequencyTX,RX frequency had better 10M or more apart.SLOT1,SLOT2 support.Package includes:1 x MMDVM duplex HotSPOT Module2 x Antenna(UHF)2 x SMA socket1 x Aluminum alloy shell