What is GrooveTube® Technology? GrooveTube® is another name for the MegaPhase super-flexible outer conductor used in many of our 50 ohm flexible cable assemblies. This high performance outer conductor is manufactured using the highest quality, pure oxygen-free copper tape. With our custom designed machines, MegaPhase production staff forms this copper tape into flexible copper tubing, or GrooveTube®. Electrical Benefits: Repeatable, reliable performance over time because the outer conductor does not fatigue when flexed like traditional braid/foil outer conductors and stiff corrugated copper types. Superior phase and amplitude stability during flexure because the inner conductor stays in the center of the outer conductor - where it belongs. The insured concentricity maintains impedance and low SWR. Low VSWR and Insertion Loss because each connector screws directly on to GrooveTube®, the outer conductor, and then the seam is 100% soldered versus other cable brands terminating to small strands of braid. Higher power handling when GrooveTube® is combined with MegaSpline™ dielectric in Series 3 cable. Heat is easily transferred from the inner conductor to the outer conductor. The GrooveTube® outer conductor corrugations act as a heat sink when cable assembly is unjacketed. Mechanical Benefits: Smaller bend radii. Built-in crush-resistant armor that withstands over 150 lbs of plane compressive force per inch (66 kg per 2.5 cm). Strong mechanical termination at connectors. Connectors screwed on to outer conductor therefore providing better pull force resistance.