What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?
What characterizes libration fading of an EME signal?
When scheduling EME contacts, which of these conditions will generally result in the least path loss?
What do Hepburn maps predict?
Tropospheric propagation of microwave signals often occurs along what weather related structure?
Which of the following is required for microwave propagation via rain scatter?
Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?
When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
Which of the following frequency range is most suited for meteor scatter communications?
Which type of atmospheric structure can create a path for microwave propagation?
What is a typical range for tropospheric propagation of microwave signals?
What is the cause of auroral activity?
Which emission mode is best for aurora propagation?
From the contiguous 48 states, in which approximate direction should an antenna be pointed to take maximum advantage of aurora propagation?
What is an electromagnetic wave?
Which of the following best describes electromagnetic waves traveling in free space?
What is meant by circularly polarized electromagnetic waves?