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 900MHz
VHF 144 220 Opera FREQ:
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.
Package includes:
1 x MMDVM duplex HotSPOT Module
2 x Antenna(UHF)
2 x SMA socket
1 x Aluminum alloy shell