This is on the Atlas flight computer which was flown on ballasthalo 1 and 2.
It uses the Radiometrix NTX2 module on 434.075Mhz at 10mW and is controlled by the main AVR using 2 pins and a resistor network.
RTTY info - 50 baud, 350 shift, Parity 0, Stop 1.5
With a GPS lock the main downlinks format is:
$$ATLAS,count,HH:MM:SS,latitude,longitude,altitude,number of sats,ascent rate;float status;time at float;internal temperature;external temperature;GPS temperature;pump temperature;photocell;ballast left raw;ballast left percentage;pump status*checksum
$$ATLAS/No GPS Data/HH:MM:SS/last latitude/last longitude/last altitude/number of sats/internal temperature/external temperature/GPS temperature/pump temperature/photocell;ballast left raw;ballast left percentage;pump status*checksum
Received data can be decoded and uploaded to the main server using
dl-fldigi
