A rigid conduit has a hard plastic exterior surface and electrical metallic tubing as the interior surface. The interface processing unit comprises a serializerdeserializer circuit, an encoderdecoder, a protocol processing unit having at least two kinds of selectable protocol processing functions, and a communicate mode switch circuit for changing reference clock to be supplied to the serializerdeserializer circuit in conjunction with switching of the protocol processing function from one to another. In another form the invention combines chip fiberizing with chemical treatments, for improving the pulp property versus energy relationships. The radar device calculates an azimuth sine value sin \u03b81 from the reception signal in the first measurement phase and also calculates an azimuth sinusoidal value sin \u03b82 from the reception signal in the second measurement phase.