Radio-Frequency Cables

Radio-Frequency Cables
Type RG

The mark RG/U is based on USA Military Standard which is the first complete standardization of radio-frequency cables thus being accepted and approved in the world although international standardization (IEC) still exists.
RG/U cables are used in a wide range of commercial electronics and highfrequency technique, i.e. where required as follows:
- long duration period
- permanent working temperatures
- high resistivity to jacket abrasion and chemical influences
- high flexibility
- small attenuation
- high stability of characteristic impendance - application of standardized connectors.
CONSTRUCTION
Inner conductor
The construction, material and tolerances of inner conductor are the elements which determinate mechanical and electrical characteristics of the cable The inner conductor may be tinned or sliver plated. Cables with inner conductor in form of strand have considerably higher flexibility.
In order to increase mechanical strength, the copperweld wires are used.
INSULATION
Temperature conditions, attenuation, dielectrical strenght and flexibility determine the material and construction of cable insulation.
Polyethylene (PE) is mainly used due to its good mechanical and electrical characteristics.
Teflon (F) is the material of a special quality referred to resistivity to high temperatures as well as good electrical characteristics.
OUTER CONDUCTOR
The outer conductor is a braid made of bare, silver-plated or tinned copper wire. The construction, covering and screening are defined by MIL-C-17 standard. Cables where considerably higher screening effect is requested are made with double braid.
CABLE JACKET
Cable jacket is classified according to MILC-C-17 standard into quality groups. Jacketing materials without plastyfiers or with some other additives are highly resistant to aging, i.e. the increase of atenuation due to aging is irrelevant.

TYPE OF CABLE JACKETS ACCORDING TO MIL-C-17
Type 11 a
Temperature range for
- outer dia: <6.35 mm: -55 up to +90°C
- outer dia: > 6.35 mm: -40 up to +90°C
Cable jacket type II a is made of soft black or grey PVC with plastyfiers. Cable may be used for direct burial and has good weathering and abrasion resistant properties.
Type III a
Temperature range -55°C up to 85°C.
This type of cable jacket is made exclusively of black PVC compound. Cable is specially suitable for direct burial. Highly resistant to weather conditions and abrasion.
Type V
Temperature range-55°C up to +250°C.
This type of cable jacket is made of fiberglas braid impregnated with silicone varnish to provide abrasion resistance and a moisture seal.
Type VII
Temperature range -55°C up to +250°C. Cable jacket of this type is made of extruded polytetrafluorethylene or sinterized double wrap made of tetrafluorethylene tapes with 50 % overlap. Distinctive properties are: resistant to high temperatures, chemically inert and insoluble in liquids and gases.
Type IX
Temperature range-55°C up to +250°C. This type of cable jacket is made of extruded transparent teflon (FEP). Highly resistant to weather conditions and chemically inert.
Besides stated constructions of radiofrequency cables according to MIL-C-17, a part of radiofrequency cable production programme according to IEC recommendations is also shown. It is understood that FKS is in position to offer other types of cables in compliance with any world standard or against special buyers' requirements.

6A/U

8/U

11 A/U

58 U

58 C/U

59 B/U

62 A/U

71 B/U

174 B/U

178 B/U

179 B/U

180 B/U

187 A/U

213 U