EIDWS CROSSWORD

3. The removal of intelligence from a transmission medium.
6. The angle between the horizontal plane and the line of sight is the _____ angle.
8. The ability to impress intelligence upon a transmission medium, such as radio waves.
9. The section of the frequency spectrum that specific signals occupy.
11. Any method of varying the amplitude of an electromagnetic carrier frequency in accordance with the intelligence to be transmitted.
12. Angle modulation in which the modulating signal causes the carrier frequency to vary.
14. Electronic system that uses reflected electromagnetic energy to detect the presence and position of objects invisible to the eye.
18. The vehicle for carrying waves from one point to another.
19. A method for simultaneous transmission of two or more signals over a common carrier wave.
20. When a wave traveling through two different mediums passes through the boundary of the mediums and bends toward or away from the normal.

1. The number of vibrations, or cycles, of a wave train in a unit of time.
2. The number of pulses radiated in one second.
4. The distance from the radar site to the target measured along the line of sight.
5. Has one-way flow of information between terminals. Technical arrangements often permit transmission in either direction, but not simultaneously.
7. The angle measured clockwise from true north in the horizontal plane is the ____ angle.
10. The band of frequencies from 3 kilohertz to 30 kilohertz.
13. All of the sum frequencies above the carrier.
15. The systematic movement of a radar beam while searching for or tracking a target.
16. Uses a single channel or frequency to exchange information between two or more terminals. Communications is in one direction only.
17. The distance in space occupied by one cycle of a radio wave at any given instant.