This shows the 2004/5 probe case open. We used a simple superglue seal on the precision milled join surface.
The 2004/5 verion used a stack of three PCBs, from left to right: radio, digital and analogue.
The 2006-7 design used a single PCB to save space and a Radiometrix radio module to reduce radio frequency to 173MHz and increase their range. The antenna is tuned to ice.
This is the 2008 probe pcb as deployed in Iceland - the new 3d accelerometer is lower left. It also had an improved low noise power supply and 0.6 microamp sleep current.
For more details on the designs see our papers section