AJ4CO Observatory, located in High Springs, Florida, is an amateur radio astronomy facility operated by Dave Typinski, call sign AJ4CO. The observatory specializes in the study of radio emissions in the 16 to 32 MHz range, with a keen focus on Jupiter's radio signals. It serves as a hub for exploring various cosmic phenomena, including emissions from the Sun, supernova remnants, and other celestial sources, as well as terrestrial interference from lightning and electronic devices.

The observatory is affiliated with the Radio JOVE project and the Society of Amateur Radio Astronomers, facilitating collaboration within the amateur radio astronomy community. AJ4CO Observatory also provides valuable resources, including an extensive archive of raw and processed data, software tools for data manipulation, and documentation outlining telescope and instrument functionalities. Additionally, users can access live audio from the Radio JOVE telescope and utilize a suite of online calculators specifically designed for radio astronomy applications.