TR-9 is a handheld transceiver (HT) for the M17 standard. Its specification can be found here. This repo contains KiCAD schematics and gerber files.

The source code has been moved to M17-project/TR-9_firmware. The codeplug example has been moved to TR-9_Codeplug

The TR-9 Radio will be capable of the following:

• UHF band (420 MHz - 450 MHz)
• Digital Voice (M17 Codec)
• FM Voice
• APRS via 1200 bps Packet (AX.25)
• Short text messaging (SMS-like)
• Optional Wi-Fi and GPS modules

The heart of TR-9 is STM32F777VI microcontroller. The handheld also contains:

• a DEM 128128A1 TMH-PWN 1.44" 128x128px TFT display
• an ESP8266-12F WiFi module
• an ADF7021 chip for the RF
• an LSM9DS1 9DoF sensor
• a USB-micro connector for firmware update (so-called DFU mode)
• an SD-micro card slot for codeplug and storage
• a connector for a GNSS module
• a Kenwood connector for external MIC/SPK

RF output level can be regulated by the software. The maximum power output is 3 watts. The radio can work with both analog and digital modulation.

M17 standard was designed having Codec2 vocoder in mind. TR-9 takes advantage of STM's internal Advanced Encryption Standard (AES) hardware for optional end-to-end encryption. There is a possibility of using other block ciphers and scrambling.

Mainboard SWD/STLink: [GND, 3v3, CLK, DIO, RST], square pad is Pin 1 and therefore GND.