Here's the flight computer board connected to the Arduino. The biggest item is the Radiometrix NTX2 module with a small voltage divider below it which is used to set the frequencies for the 0 and 1 values. The antenna is connected to the SMA connector bottom left.
Here's a log of transmitted temperature data received via RTTY:
$$GAGA,24.0,Error: 0, $$GAGA,24.0,Error: 0, $$GAGA,24.0,Error: 0, $$GAGA,24.0,Error: 0, $$GAGA,24.0,Error: 0, $$GAGA,23.9,Error: 0, $$GAGA,23.9,Error::C'fwyZ '/A,23.7,Error: 0, $$GAGA,23.7,Error: 0, $$GAGA,23.7,Error: 0x$$GAGA,23.8,23.3, $$GAGA,23.7,22.9, $$GAGA,23.7,22.6, $$GAGA,23.7,22.6, $$GAGA,23.7,29.8, $$GAGA,23.7,29.7, $$GAGA,23.7,27.6, $$GAGA,23.7,26.1, $$GAGA,23.7,25.0,The first few lines of reports show the internal temperature (24.0C---yes, it's warm in the basement) and an error report (Error: 0) for the external temperature. The error was happening because I didn't have the sensor plugged in. I recently enhanced the code that handles the DS1821 sensor to report errors. Error 0 means that the sensor didn't respond.
The garbled output is because I was fiddling around with my radio. I then plugged the sensor in it started reading temperatures. The temperature peaked at 29.8C because I held the sensor in my hand.
Next steps are: a long distance test of transmission to make sure that's working correctly and install the GPS. With the GPS I'll be at the end of the long GAGA-1 road.
PS One final shot of the Arduino shield showing the painful leg bending required to fit in with the Arduino's silly pin spacing.