Showing papers by "General Cable published in 1959"

Combination power and communication cable

Abstract: 937,851. Cables. GENERAL CABLE CORPORATION. Jan. 25, 1960 [March 5, 1959], No. 2720/60. Class 36. A combined power and communication cable comprises at least three conductor units laid up helically together within a common sheath, two of these units being of insulated power conductors 11 and the third 14 (and Fig. 5) containing a plurality of individually insulated communication conductors 31 cabled together helically and having a continuous surrounding shield 35 formed by a helically lapped metal tape with overlapping convolutions. Bare earthing wires 33 are laid up in the interstices of at least some of the communication conductors such earthing wires being in contact with successive convolutions of the shield. A further earthing conductor 19 may be laid up between the power cores of the completed cable. The shield may be of copper tape and a further covering of steel tape may be provided and held in place by a P.V.C. sheath 36. The power conductors 11 may be insulated with P.V.C. 12, served with wrappings of crumpled paper 13, laid up with the communication unit with crumpled paper fillers 17 and provided with a braided sheath 18 suitably proofed and coloured. Alternatively the assembly may be sheathed with a helically-applied steel strip with interengaging edges (Fig. 2, not shown).

Transmission properties of polyethylene-insulated telephone cables at voice and carrier frequencies

Abstract: In the last few years, amplitudemodulated carrier telephone systems up to about 250 kc have been routed over polyethylene toll cables and frequencymodulated carrier telephone systems up to about 350 kc have been routed over entrance cable for open-wire circuits. Trunk cable carrier systems with top frequencies of 400 kc or more are under development. Study is being given to pulse-code-modulated cable carrier systems with top frequencies of a megacycle or more. The problems of crosstalk control and noise shielding at carrier frequencies have, therefore, become of prime importance.