Among the features that have helped the ST connector supplant FSMA connectors as the industry standard are lower insertion loss, and the quick-release
bayonet coupling in place of the multiturn threaded coupling.
Standard features of the Canbio VS include a quick-barrel-change system using a
bayonet coupling of the screw directly to the screw motor, permitting changeover times on the order of 15 min.
The BNC interface is the most popular because of its easy connect/disconnect
bayonet coupling. The TNC interface offers a threaded coupling that assures excellent performance even in applications where vibration is common, such as in aircraft and automobiles.
After the overburden hole is complete, the pilot bit is turned anticlockwise in the ring bit releasing it from the
bayonet coupling, and is withdrawn from the casing tube.