What is provided is a receiver-on-a-chip comprising a monolithic integrated circuit that reduces the receiver to a cigarette-pack-sized assembly mountable directly at an antenna element, with a much-increased operational bandwidth and instantaneous bandwidth, increased dynamic range and with a two-order-of-magnitude decrease in size and weight. The cavity accepts microwave-frequency electromagnetic radiation through input couplers 90 degrees out of phase with each other to excite circular polarization heating modes. In addition to the fastener, between the spindle insert and adapter, a torque transmission establishes a positive connection between the spindle insert and adapter. The cut follows a convoluted path in the convoluted path areas forming the wall of the tubular body into a pair of complementary, mating hook formations of opposed curvature. The driver and the receiver have a phase lock circuit adapted to Fibre Channel and arranged for phasing the both with each other.