What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?
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 in association with what phenomenon?
What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?
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 ranges 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 of these emission modes is best for auroral propagation?
What is meant by circularly polarized electromagnetic waves?