We decided to be cruel and do some extreme testing to see how the RFD900 modems behave under extreme cold conditions.
The modem was shut down and allowed to cold soak at -60 degrees C. Then powered up to maximum power and had a look at data transfer and connectivity tests. All works just fine.
The modems are available from Australia from the RFDesign web-store, but we are also making arrangements for a wider distribution network. -- Announcements coming soon!