Download Antenna Handbook MCRP 3-40.3C by U.S. Marine Corps PDF

By U.S. Marine Corps

Communications and data structures (Cis) help accumulating, processing, and replacing details. Cis automate regimen capabilities, liberating commanders and staffs to target the features of command and keep watch over that require adventure, judgment, and instinct. body of workers who set up, function, and hold Cis play a key position within the command and keep watch over of the Marine airground activity strength (Magtf). it really is an underestimation to assert that the luck of the Magtf within the smooth battlespace is determined by the powerful employment of Cis.

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Extra info for Antenna Handbook MCRP 3-40.3C

Sample text

Avoid locating transmitters and receivers where an airfield is at or near midpoint of the propagation path of frequencies above 20 MHz. Many other things may affect the propagation of a radio wave. Hills, mountains, buildings, water towers, tall fences, aircraft, and even other antennas can have a marked affect on the condition and reliability of a given propagation path. Conductivity of the local ground or body of water can greatly alter the strength of the transmitted or received signal. Energy radiation from the Sun’s surface also greatly affects conditions within the ionosphere and alters the characteristics of long-distance propagation at 2 to 30 MHz.

From about 50 to 100 MHz, there is only a slight improvement over horizontal polarization with antennas at the same height. Above 100 MHz, the difference in signal strength between vertical and horizontal polarization is small. However, when antennas are located near dense forests, horizontally polarized waves suffer lower losses than vertically polarized waves. Vertically polarized radiation is somewhat less affected by reflections from aircraft flying over the transmission path. With horizontal polarization, such reflections cause variations in received signal DIRECTION OF TRAVEL DIRECTION OF ROTATION, RIGHT-HAND Figure 2-5.

One is an induction field, which is associated with the stored energy; the other is a radiation field. At the antenna, the intensities of these fields are large and are proportional to the amount of RF power delivered to the antenna. At a short distance from the antenna and beyond, only the radiation field remains. This field is composed of an electric component and a magnetic component (see fig. 2-1 on page 2-4). The electric and magnetic fields (components) radiated from an antenna form the electromagnetic field.

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