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As an extension of the usual steel conduit system, certain manufacturers are now producing large bore fibre conduit, which is laid within walls and floors, as the building is constructed, and, by employment of suitable concealed boxes, cables may conveniently negotiate a number of rooms, without difficulty (Fig. 14). F i b r e c o n d u i t ~"' tubes F I G . 1 4 . Typical arrangement of fibre conduit tubes. Surface channels and battens. These are usually confined to small installations, and are of use where the installation is of a temporary nature, or where the equipment is fitted above ground-floor level, where restrictions preclude the employment of any of the alternative systems.
V . H . F . multiplex equipment installation in an equipment room, illustrating use of overhead cable racking. ) PLATE 2. Typical transmitter installation utilizing a plinth. ) PLATE 3. Typical transmitter installation employing large floor ducts. ) 39 BUILDINGS provided with a suitable screwed cover, to prevent damage being sustained by the cables. The batten size will depend upon the number of cables and their size ; the batten often consists of softwood of about l^in. thickness, into which the cable cleats may be screwed.
F. pick-up of extraneous fields would impair the received signal to noise ratio. The coaxial line, in cable form, permits a very high degree of flexibility to be obtained, thus lending itself readily to use in simple, but effective, aerial exchanges. The cable is employed extensively for interconnection of chassis within transmitting and receiving equipment alike. Unlike the open wire transmission line, however, the attenuation is often of some consequence, being appreciably greater, length for length, than the open wire version.
Cunningham radio tubes manual by RCA/Cunningham