Test radar demonstration of the orbitron maser

Summary form only given. The significance of the orbitron maser is in the FEL (free-electron laser) like frequency tunability, which is not achievable by conventional short-wavelength devices. Unlike the FEL, however, the orbitron can readily emit a continuum of wavelengths without a continuous change in beam energy. Using the appropriate bandpass or frequency disperser, this device has been used to construct a frequency-tunable radar. Preliminary test results using a Cassegrain configuration for the transmitter were very favorable. A clear frequency-tunable signal could be received from a 30-meter-distant target over a frequency range from 70 to 90 GHz. It has also been shown to work well in smoke and dust.