MMDVM Duplex Hotspot Development Board STM32-DVM 420-475 MHz Multi-Mode Digital Support Repeater Board with 0.96 Inch OL

Specification Product Name MMDVM DuplexHotspot Development Board Controller STM32 DVM MMDVM HS for Raspberry Pi GPIO interface Supported bands main 420 475 MHz also 144 148 219 225 842 950 MHz depends on radio setup Operating modes DMR D STAR C4FM YSF P25 NXDN multimode digital voice Duplex Simplex configuration via Pi Star MMDVM DUPLEX Typical RX TX example frequencies Duplex RX 438 0000 MHz TX 433 0000 MHz Simple RX 438 0000 MHz TX 438 0000 MHzCompatible hardware Raspberry Pi Zero 1 2 3 4 Pi 4B requires removal of right GPIO socket as shown Power input 5 V via Raspberry Pi GPIO fan output pads provided Onboard reference clock 3225 TCXO low bit error rate default 0ffset in Pi Star is 0 Firmware update pistar mmdvmhshatflash hs dual hat via Pi Star Features 1 Built in 0 96 I2C OLED screen for live display of frequency mode callsign and status 2 Full duplex hotspot board with separate RX TX paths suitable for repeater style operation 3 Multimode digital support works with DMR D STAR C4FM YSF P25 and NXDN networks through Pi Star 4 Standard Raspberry Pi GPIO pinout easy stacking on Pi boards or connection by header wires 5 Fan and TX power pads for external cooling fan and RF module clearly marked TX FAN on PCB 6 Metal enclosure option with window for OLED and ventilation slots giving neat compact installation Package Includes 1 x MMDVM DuplexHotspot Development Board