Abstract: A high frequency shielded data transmission cable and method of making same are disclosed. Optimal transmission and minimal signal loss are achieved when the conductors of such a cable are maintained in fixed positions relative to one another and relative to the metal shielding. These features are provided by a cable of the instant invention wherein a central core having diametrically opposed spiral grooves hold the insulated conductors in fixed relation to one another. At least one inner layer of dielectric material maintains the insulated conductors within the grooves and provides a fixed spacing between the conductors and the metal shielding. Metal shielding, preferably of braided strips of metal, provides additional strength and flexibility to the cable. The interstitial spaces of the braid may optionally be filled with a filling compound. Likewise, the insulated conductors may be coated with a water-blocking compound to fill any spaces between the conductors and the walls of the grooves.