WIDELY COMPATIBLE: Supports DMR, P25, D-Star and System Fusion. High-performance 32-bit ARM processor delivers up to 10mW RF transmit power. Every module undergoes complete quality testing. Compatible with Raspberry Pi 1, 2/2B, 3/3B/3B+, 4/4B, Pi Zero and Pi Zero 2W
Frequency Specifications: Supported frequency bands: 144–148MHz, 219–225MHz, primary bands 420–475MHz, 842–950MHz.
Recommended amateur radio operating band: 430–440 MHz.
NOTE: TX=0, RX=0.
Modem Selection: STM32-DVM/MMDVM_HS-Raspberry Pi Hat (GPIO) or other GPIO-based boards
Important Tips: If the board cannot operate normally under duplex mode, execute this firmware upgrade command:
sudo pistar-mmdvmhshatflash hs_dual_hat
If the command fails, replace Pi-Star with WPSD for MMDVM. Reference: https://www. mmdvm. club/index .php/wpsd.html
Up-to-date Firmware: This MMDVM Duplex Hotspot Board comes preloaded with firmware V1.5.2 and supports upgrading to V1.6.1.
Upgrade Operation Guide:
Access path: Pi-Star → Expert → SSH Access
Username: pi-star | Password: raspberry
Connect JP1 jumper first, then run the upgrade command. Unplug JP1 once the upgrade completes
Package List:
1 × MMDVM Duplex Hotspot Module
2 × Antennas
Should you meet any problems during usage, please get in touch with us for support
After-sales Support: If you run into difficulties during firmware updating, feel free to contact us. We offer professional technical support and after-sales service to help you troubleshoot all issues
