Firmware for RS41 for HAM use
It is possible to recycle RS41-SGP sondes for amateur radio use without any electrical changes! You just have to build a new firmware (this one) and apply it via a cheap adaptor "ST-Linkv2". Modified sonde now transmits on defineable frequenca in 70cm band GPS and telemetry data in FSK RTTY format which is used by HAB projects and additionally it transmits APRS packets on a seperately defineable TX frequency.
Released under GPL v2
Use: https://www.wyzbee.com/download/Utilities/Software/CoIDE-1.7.8.exe
Maybe you have to set correct path to gcc-arm-none-eabi in CMakeLists.txt.
cd into main folder
cmake .
make
All configs in config.h
SEND_RTTY Optionally send RTTY packet every TX_DELAY msSEND_RTTY_<value> Include RTTY_CALLSIGN RTTY callsignRTTY_COMMENT RTTY commentRTTY_WWL Send WWL instead of the RTTY commentPAIR_COUNT World Wide Locator pairs (precision)RTTY_FREQUENCY RTTY frequency in MHzRTTY_DEVIATION RTTY shift configurable in 270Hz stepsRTTY_SPEED RTTY speed in baudsRTTY_7BIT Use 7 bit RTTYRTTY_USE_2_STOP_BITS Use 2 stop bitsSEND_APRS Optionally send APRS packet every TX_DELAY * RTTY_TO_APRS_RATIO msAPRS_CALLSIGN APRS callsign, 6 characters. If your callsign is shorter add spacesAPRS_SSID APRS SSIDAPRS_DISPLAY_TABLE APRS Display TableAPRS_DISPLAY_SYMBOL APRS Display SymbolAPRS_COMMENT APRS commentAPRS_FREQUENCY APRS frequency in MHzRTTY_TO_APRS_RATIO Number of RTTY frames between each APRS frameSEND_MORSE Optionally send Morse message every TX_DELAY * RTTY_TO_MORSE_RATIO msMORSE_PREFIX Start of the Morse message (DE SEND_MORSE_<value> Include MORSE_SUFFIX Optional end of the Morse message (ar^)MORSE_WPM Morse speed in words per minuteRTTY_TO_MORSE_RATIO Number of RTTY frames between each Morse messageTX_POWER Power 0-7, (7 means 42.95 mW@434.150 MHz measured on E4406A)ALLOW_DISABLE_BY_BUTTON Allow disabling device using buttonTX_DELAY Delay between RTTY frames in millisecondsLED_ENABLED Optionally /disable LED blinking (takes effect after approx. 10 minutes)Have a nice day ;)