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Fifty five of reducing or eliminating nterferenceover a wide frequency vary, different means are associated with the cable which are effective in reducing or eliminating interference over different parts of the total frequency range. Wide frequency vary, an auxiliary conductor is wound across the central conductor to type a balanced circuit for decreasing low frequency interference and extra metallic means surrounding the auxiliary conductor for decreasing interference over the higher frequency portion of the full frequency range. An electric transmission system embodying a co-axial cable comprising an internal insulating sheath and a centre conductor, an auxiliary conductor helically wound over mentioned sheath in such a manner as to form a balanced circuit for lowering low frequency interference, a conducting sheath oi' lead surrounding the auxiliary conductor, internal sheath and centre conductor for decreasing or eliminating interference at high frequencies, and tape of delicate iron utilized externally to the sheath of l lead for decreasing interference at frequencies intermediate the said low and high frequencies. Wire wound around said sheath and connected to the centre conductor through an exterior circuit to kind a balanced circuit for lowering low frequency interference, a conducting sheath of lead surrounding the auxiliary conductor and inner sheath for reducing interference at high frequencies, and tape of mushy iron utilized externally to the sheath of lead for lowering interference at frequencies intermediate the stated low and high frequencies.

In the preferred form of the invention the cable is associated with an auxiliary conductor and is so connected as to be effective in decreasing or eliminating interference at frequencies as much as 2,000 cycles per second and is provided with lead sheathing or a sheath of equivalent materials for the purl0 pose of lowering or eliminating interference at frequencies above about 50,000 cycles per second, the lead sheathing having applied to the outer floor thereof tape of smooth iron or different suitable materials to dealwith frequencies between 2,000 and 50,000 cycles'per second. 2,000 cycles per second and is provided with lead sheathing or a sheath of equivalent materials for the purl0 pose of reducing or eliminating interference at frequencies above about 50,000 cycles per second, the lead sheathing having utilized to the outer surface thereof tape of smooth iron or other appropriate materials to dealwith frequencies between 2,000 and 50,000 cycles'per second. In response to the primary feature of the invention an electric transmission system is offered comprising a co-axial cable by which, for the aim 55 of lowering or eliminating nterferenceover a wide frequency range, different means are related to the cable that are effective in lowering or eliminating interference over completely different portions of the overall frequency vary.

Wide frequency vary, the construction of the cable might be practicable and economical. For conducting massive currents between units, a cable bus is used. At high frequencies, if a thick tape is used, its effectiveness turns into relatively o much less, electric cable resulting from eddy currents in the cross-section oi the tape. 6 may be of about one-sixteenth of an inch thick which affords shielding suilicient to scale back or eliminate interference at frequencies above 50,000 cycles per second. It is usually well-known that the addition of iron tape round the lead sheath will enhance the shielding. Wire helically wound around stated paper sheath, copper tape surrounding mentioned wire and paper sheath, a lead sheath spaced from and surrounding stated copper tape, wire and paper sheath, and a tape of comfortable iron surrounding mentioned lead sheath. The bare metallic sheath, at earth potential, was thought of protected to contact. Wide range of frequencies comprising an insulating sheath and a central conductor Within said sheath, a conductor helically Wound around said insulating sheath, an electrically conducting sheath surrounding mentioned final conductor and mentioned insulating sheath, a lead sheath spaced from and surrounding said electrically conducting sheath, and a tape of magnetic permeability surrounding said lead sheath.

Four are related'to the secondary winding of a transformer having a centre faucet which is earthed, as by a connection to the lead sheathing 6, the signals which it's desired to transmit alongside the cable being utilized to the first of the transformer. British Patents Nos. 452,713 or 452,772, the paper sheath 2 being replaced if required by the insulating sheath of rubber described in these specifications. Modes 1, 2 and 3 require NO programming of the Serial Pea with the mode being selected by jumpers, as is the choice of latched, 1 sec, 2 sec or four sec pulse. The host controller will require programming with appropriate strings for the mode of operation. It has four modes of operation. Modern non-metallic sheathed cables, resembling (US and Canadian) Types NMB and NMC, consist of two to 4 wires lined with thermoplastic insulation, plus a wire for Protective Earthing/Grounding (bonding), surrounded by a flexible plastic jacket.