Software for WSPR Tracker based on components from RS41 radiosonde

Check my parts list here

The goal of this project is to show that you can use some components from RS41 radiosonde in your own trackers.

Used components from RS41

1. STM32F100C8
2. 24 MHz crystal
3. 26 MHz TXCO

Unique features

• TX at multiple timeslots: 8 0, 4 6 so you can hit propagation easier and get more spots
• Power GPS and SI5351+TXCO separately from STM32

Power usage

About 3.3V 40mA max. We never power GPS and SI5351+TXCO at the same time to lower the maximum peak

Pinouts

1. GPS TX at PA10, RX at PA9 (GPS TX could be also used as serial debug)
2. I2C SCL at PB10, SDA at PB11 (needs 3.3k/4.7k ohm resistors on the I2C line)
3. GPS VCC at PB4+PB5+PB6+PB7
4. SI5351+TXCO VCC at PA1+PA2+PA3+PA4
5. SWDIO at PA13, CLK at PA14

PCB is currently unavailable to public!

More information should available soon.

Build

via docker docker run --rm -it -v E:\RS41_WSPR:/usr/local/src/RS41ng rs41ng_compiler

(change the directory path)

Flash

via openocd

unlock first time by ./unlock.bat flash ./flash.bat

73, Damian SQ2CPA, Poland