DESCRIPTION Original cystal : Original ECS-TXO-3225-147.4-TR from USA 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. Setting Tips: Modem select: STM32_HS_GPIO FREQUENCY: UHF 433-900MHz, VHF 144-220 MHz. NOTE: TX =0, RX=0. Modem select: STM32_HS_GPIO ; To leave the screen on all the time In Pi-Star configuration, ensure you have "OLED Type 3" in the display type field at the top of the page, set Port to: modem. Also, in the Expert section, go to MMDVM host, and scroll down to the OLED section. Make sure LogoScreensaver is set to 1. This leaves the screen on all the time. Otherwise, it goes blank when idle Package List: 1x MMDVM duplex HotSPOT Module 2x Antenna 2x SMA socket See moreFREQUENCY: UHF 433-900MHz, VHF144-146. NOTE: TX =0, RX=0. Modem select: STM32_HS_GPIO ; To leave the screen on all the time In Pi-Star configuration, ensure you have "OLED Type 3" in the display type field at the top of the page, set Port to: modem. Also, in the Expert section, go to MMDVM host, and scroll down to the OLED section. Make sure LogoScreensaver is set to 1. This leaves the screen on all the time. Otherwise, it goes blank when idle. EASY OPERATION: The firmware is pre-loaded and is easily upgraded via software. Onboard LEDs showing status (Tx,Rx,PTT,Mode). WORK with RASBERRY Pi: Mounts cleanly on current Raspberry Pi including the Pi Zero , NOT compatible with Rasberry Pi 4. WIDELY COMPATIBLE: Supports DMR, P-25, D-Star and System Fusion. if the board fails to work on duplex mode, please run the upgrade command: sudo pistar-mmdvmhshatflash hs_dual_hat ; HIGH PERFORMACE: 32-bit ARM processor, up to 10mW RF power, fully tested every piece.
