Excalibur Systems, established in 1986, specializes in creating PC-based avionics test equipment and multi-protocol hardware and software. They offer a range of products including board level products, systems like MACC and Dragon, software applications, and couplers. Excalibur Systems focuses on aiding engineers in communication systems for aircraft, ships, rugged vehicles, radars, and missile systems. They prioritize customer relationships, providing in-house engineering support and developing new products while maintaining support for legacy systems. The company's expertise lies in communications technology and they share their vast experience through courses, tutorials, and customized product specifications.