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

By U.S. Marine Corps

Communications and knowledge structures (Cis) aid accumulating, processing, and replacing info. Cis automate regimen services, liberating commanders and staffs to target the facets of command and regulate that require event, judgment, and instinct. team of workers who set up, function, and preserve Cis play a key position within the command and regulate of the Marine airground activity strength (Magtf). it truly is a real understatement to claim that the good fortune of the Magtf within the sleek battlespace is determined by the powerful employment of Cis.

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Additional info for Antenna Handbook MCRP 3-40.3C

Sample text

Small changes in antenna location do not cause large variations in the field intensity of horizontally polarized waves when an antenna is located among trees or buildings. When vertical polarization is used, a change of only a few feet in the antenna location may have a significant effect on the received signal strength. DIRECTIONALITY Vertical receiving antennas accept radio signals equally from all horizontal directions, just as vertical transmitting antennas radiate equally in all horizontal directions.

Scatter propagation is usually limited to path distances of less than about 500 km. NOISE Noise consists of all undesired radio signals, manmade or natural. Noise masks and degrades useful information reception. The radio signal’s strength is of little importance if the signal power is greater than the received noise power. This is why S/N ratio is the most important quantity in a receiving system. Increasing receiver amplification cannot improve the S/N ratio since both signal and noise will be amplified equally and S/N ratio will remain unchanged.

The input impedance of an antenna depends on the conductivity or impedance of the ground. For example, if the ground is a simple stake driven about a meter into earth of average conductivity, the impedance of the monopole may be double or even triple the quoted values. Because this additional resistance occurs at a point on the antenna circuit where the current is high, a large amount of Antenna Handbook ____________________________ 2-15 transmitter power will dissipate as heat into the ground rather than radiated as intended.

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