Electrical transmission line diametrical retainer

A system for mechanically retaining an electrical transmission line in a passageway comprising:

• a coaxial cable, the coaxial cable comprising a conductive tube and a conductive core within it, the conductive tube having a first and a second outer diameter, the second outer diameter being larger than the first outer diameter
• an internal diametrical expansion mandrel or retainer with a central passage, the expansion mandrel having a front and a back end, the back end having an outer diameter that is greater than an outer diameter of the front end;
• the front end outer diameter is less than an inner diameter of the conductive tube, the back end outer diameter is greater than the inner diameter of the conductive tube;
• the expansion mandrel is disposed within the conductive tube so as to maintain the increased outside diameter of the conductive tube;
• the passageway in which the coaxial cable is placed comprises recesses complimentary with the first and second conductive tube outer diameters.

A system for mechanically retaining an electrical transmission line for use in a rotary drill string, the drill string comprising individual drill pipe sections, each pipe section containing the electrical transmission line;

• the system comprising:
• a drill pipe with a uniform internal diameter having a box end tool joint and a pin end tool joint;
• a passageway in each box end and pin end tool joint which is connected to the internal pipe diameter and runs along the longitudinal axis of the pipe;
• a coaxial cable, the coaxial cable comprising a conductive tube and a conductive core within it, the conductive tube having a first and a second outer diameter, the second outer diameter being larger than the first outer diameter;
• a first and second expansion mandrel with the central passage, each expansion mandrel is disposed within the conductive tube,
• a first and second barbed expansion mandrel with a central passage, each barbed expansion mandrel having external circumferential grooves, the barbed expansion mandrel is disposed within the conductive tube and placed adjacent each expansion mandrel, the passageway in which the coaxial cable is placed comprises recesses complimentary with the first and second conductive tube outer diameters.