[en] A description is presented of the elements which form a transmission and launching system for the 2 MW ECH Inside Launch experiment on the DIII-D tokamak. The design of various system components, such as mode converters, waveguide bends, couplings, split waveguides, and launching mirrors are described. The DIII-D ECH system has ten gyrotrons which each produce 200 kW of power at 60 GHz. Each gyrotron has its own run of waveguide, about 46 m in length, to connect it to a vacuum window at the tokamak. A taper after the window reduces the diameter of the waveguide to the size that meets the requirements of the vacuum vessel port. A split waveguide which is electrostatically biased carries the microwave power across the location of the magnetic field resonance. The launch point is at the centerpost at midplane. The launching mirrors are adjustable to different angles of injection. 3 refs., 3 figs