| 摘要 |
458,084. Cables and insulators. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London, and RUST, N. M., 109, London Road, Chelmsford. June 8, 1935, No. 16725. [Class 36] [See also Group XL] In an aerial lead-in arrangement in a wireless system for receiving either short wave or longer wave signals, comprising three conductors insulated from one another and arranged to form a flexible structure, the lead-in may comprise three copper &c. strips 1, 2, 3, held apart by sets of china or like insulators S, Fig. 2a, provided at intervals along the lead-in, the insulators in each set being held together by metal tape. The three-strip lead-in is preferably slightly twisted. Fig. 8 shows an alternative lead-in construction, in which the central conductor 2 consists of a strip having a slight twist, and the two outer conductors 1, 3 are wires which follow the twist of the strip and have small bead insulators 19 threaded thereon. These are held in position by burring the wires and maintain the separation and correct relative positioning of the conductors. An outer tube 20 of lead, or preferably an enclosing rubber tube having an outer screen of copper braid with a weatherproof covering, is provided. The braid is earthed. A further construction of lead-in, Fig. 11, (not shown) comprises three strip conductors passing through slots in mica or like discs having metal rims and arranged at intervals in the length of the lead-in, or through insulators formed in halves clamped together. |
