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15 Cards in this Set
- Front
- Back
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What is the term for an exact multiple of the fundamental frequency?
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Harmonic
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What method is used for simultaneous transmission of two or more signals over a common carrier wave?
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Multiplexing
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What is a signal-producing process that uses heterodyning and frequency selection?
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Frequency synthesis
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What is the term for an undesired frequency capable of producing the desired frequency through heterodyning?
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Image frequency
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What is forward AGC?
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When an amplifier is driven toward saturation
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What is the term for when a circuit is closed and current flows in TTY operation?
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Marking
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What is the term for a combined, simultaneous display of the amplitude and phase relationships of two input signals on a CRT?
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Lissajous pattern
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What type of multiplexing transmits and receives the full 360 degrees of each sine wave?
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Frequency-division multiplexing
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What term is used to describe the degradation of a receiver or system by externally produced rf energy?
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Electromagnetic interference (EMI)
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What type of satellite amplifies the received signal and transmits it back to earth?
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Active satellite
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What type of satellite orbit rotates close to, but not exactly at the same speed as the earth?
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Near synchronous orbit
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What is the point in the orbit of a satellite closest to the earth?
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Perigree
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What is the angular difference between the equatorial plane of the earth and the plane of orbit of the satellite?
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Angle of inclination
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What is the elevation range of a medium altitude orbit?
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2,000 to 12,000 miles above earth
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What is the period of time for one earth terminal to yield control to another as a satellite moves out of its area of coverage?
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Hand over
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