At the heart of the system is an enhanced headset using a UK wireless technology called Bluetooth, integrated into a hard hat, worn by staff working on the ground. The device features a 200m range, almost twenty times more than standard Bluetooth systems, allowing it to communicate with the crane operator and other users on the ground via an access point mounted on the crane’s jib. The access point is connected via Ethernet to a ruggedised PC in the operators cab. The cab is fitted with speakers, microphone, and a foot pedal, allowing the operator to use the system without taking his hands away from the crane’s controls. The PC can be used as a blackbox, to maintain records of conversations between staff in case of accidents.
Unlike half-duplex radio systems, where users need to hold a button down to speak, the Bluetooth system allows for full duplex conference-call style communications between the entire crane team. Once the system is turned on, with a single button push, users can talk handsfree – accessories include voice recognition, removing the need even for this single button press. The hardhats worn by crew on the ground feature in-built hearing protection and noise cancelling.
