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A modern high-gain UHF Yagi television antenna with 17 directors, and one reflector (made of four rods) shaped as a corner reflector Drawing of Yagi–Uda VHF television antenna from 1954, used for analog channels 2–4, 54–72 MHz (U.S. channels).
ACR Electronics, Inc. produces search and rescue equipment such as emergency locator beacons, electronic distress flares, communications satellite transceivers, strobe lights, emergency position-indicating radiobeacons, and marine VHF radios. [2] [6] [8] [10] Their equipment is designed for use in aviation, military, outdoor recreation, and ...
High-gain antennas have the advantage of longer range and better signal quality, but must be aimed carefully at the other antenna. An example of a high-gain antenna is a parabolic dish such as a satellite television antenna. Low-gain antennas have shorter range, but the orientation of the antenna is relatively unimportant.
The result is a higher gain, or gain/spillover ratio, at the cost of surfaces that are trickier to fabricate and test. [ 10 ] [ 11 ] Other dish illumination patterns can also be synthesized, such as patterns with high taper at the dish edge for ultra-low spillover sidelobes , and patterns with a central "hole" to reduce feed shadowing.
Aerial survey is a method of collecting geomatics or other imagery data using airplanes, helicopters, UAVs, balloons, or other aerial methods. Typical data collected includes aerial photography , Lidar , remote sensing (using various visible and invisible bands of the electromagnetic spectrum , such as infrared , gamma , or ultraviolet ) and ...
A television antenna, also called a television aerial (in British English), is an antenna specifically designed for use with a television receiver (TV) to receive terrestrial over-the-air (OTA) broadcast television signals from a television station.