The NRL precision "Big dish" antenna

The highest gain antenna in the world today is the 50 foot parabolic reflector built for the Naval Research Laboratory for operation at wavelengths as short as 8 mm. A description of this precision antenna, which is used for research in radio astronomy, is presented. The mechanical aspects of the dish are given primary consideration. Fabrication procedures, design considerations and a description of the unique surface machining apparatus are treated -- these techniques yielding a reflector with an over-all surface accuracy of inch. A mention is made of a few of the recent advances in radio astronomy made at NRL through the use of the Big Dish -- testifying to the successful completion of the project.