IS 5026 : 1987 General requirements and tests for radio frequency cables

1 Scope

1.1 This standard covers flexible and semi-rigid radio frequencycables with solid and semi-solid dielectric cores, with single,dual and twin inner conductors, primarily intended for use astransmission lines to conduct energy in a simple power transfercontinuously or intermittently.

Note - In general, these cables are designed for low-loss,stable operation from the relatively low frequencies through thehigher frequencies in the microwave and radar regions of thefrequency spectrum. These cables are mainly used as connections toequipment or systems and for their inter-connection cables may alsobe used as circuit elements, delay lines or impedance matchingdevices.

1.1.1 Cable Types

1.1.1.1 Flexible, coaxial single conductor - A flexible coaxialcable is constructed of a single inner conductor covered by aflexible low-loss RF dielectric core material which is thensurrounded by a braided outer conductors, with the whole covered bya protective covering. In some cases, this is covered by an extrabraided armour for use in extremely abusive applications. Eachelement of the cable is designed to contribute to the requirementsof the finished product.

1.1.1.2 Semi-rigid, coaxial single conductor - Semi-rigidcoaxial cables are constructed of a single inner conductor coveredby a flexible low- loss RF dielectric core material, which is thensurrounded by a solid, continuous, metallic outer conductor.

1.1.1.3 Two-conductor - Individual dielectric cores oftwo-conductor cables shall meet the requirements of solid orsemi-solid dielectric cores. One strand of one of the innerconductors shall be coded for identification and shall be visiblewithout disturbing the stranding. That is, if all the strands ofthe inner conductors are coated, then one strand shall be bare; orif all of the strands are bare, then one strand shall be coated.

a) Twin - Twin cables shall be constructed of individual innerconductors within individual dielectric cores, within a commonouter conductor or may have individual inner conductors within acommon outer core that may be filled-to-round.

b) Dual - A dual cable shall be constructed of individualcoaxial cables enclosed within a common outer conductor.

1.1.1.4 Triaxial - Triaxial cables are constructed the same wayas regular coaxial cables except for an additional interlayer ofdielectric material over the outer conductor, over which is laid anextra shield, with the whole covered by a protective covering.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 1885 : Part 32 :1971 Electrotechnical vocabulary: Part 32Cables,conductors and assessories for electricitysupply.

IS 3975 :1979Specification for mild steel wires, strips andtapes for armouring of cables

IS 8080 :1976Specification for silver-coated copper wire

IS 9000 : Part 1 :1977 Basic environmental testingprocedures forelectronic and electrical items: Part 1 General

IS 9000 : Part 3 : 1977 Basic environmentaltesting procedures forelectronic and electrical items: Part 3 Dryheat test

IS 9000 : Part 18 : 1977 Basic environmental testingprocedures forelectronic and electrical items: Part 18Solderability test

IS 9567 :1980Specification for tin or tin-lead coatedcopper-wire

IS 10579 :1983Specification for polyethylene (PE) insulationand sheath of telecommunication cables