MMDVM HS Dual Hat Duplex Hotspot Board kit Support Pistar P25 DMR YSF NXDN For Raspberry pi Selling point : Our simplex and duplex systems all use an offset of 0, which is our duplex system. Regardless of simplex or duplex, the offset is 0. We are using high-precision temperature compensated crystals, so it is 0 We use high cost TCXO crystal with extremely low bit error rate, offset of 0, and frequency error of 0 The default bit error rate is less than 5%, and the default offset is 0. If the bit error rate is more than 5%, as long as the signal can be received, it can be corrected by offset. 1.Latest version V1.3, and the firmware is latest Revision 1.3 An accidentially deleted 3v3 wire has been added back to the PCB layout. BOM, Mouser cart and stencil stay the same as for rev1.2. 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. - Open source 3D printable case available - UHF 430-450 MHz,433mhz and 900MHz VHF 144 220 Opera FREQ The upper partis 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 List: - MMDVM duplex HotSPOT Module x1 - Antenna x 2 - SMA socket x 2pcs _x000D_