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