| 摘要 |
Data and speech are transmitted along an elongate member from a transmitter to a receiver. Toroids are used to effect a low frequency coupling between the transceivers and the elongate member. The toroids are segmented and their windings are such as to form part of a resonant circuit as well as being arranged around the segments such that external fields are cancelled. Protective shrouds are arranged around at least part of the toroids. |
