The electronics of a gondola, which enable users to operate the BMU, are normally connected to the roof car with a separate cable. This results in a major limitation: it limits the maximum height that a gondola can cover to a mere 100 meters (328 ft.).
Covering greater heights means using special conductor cables (E-leiters), which are integrated into the steel cables from which the gondola is suspended. Albeit effective, this solution is about ten times more expensive than using a separate cable. Plus, E-leiters require annual inspection and need to be replaced every four to six years.
Radio frequency control is an innovative and cost-efficient solution to this frequently-encountered problem. It requires a one-time investment that enables a gondola to communicate with a roof car over a distance of max. 500 meters (1640 ft). This solution needs no regular maintenance and precludes the risk of misuse, because no cables need to be connected.