By U.S. Marine Corps

Communications and knowledge structures (Cis) help accumulating, processing, and changing info. Cis automate regimen features, liberating commanders and staffs to target the facets of command and keep an eye on that require event, judgment, and instinct. body of workers who set up, function, and retain Cis play a key function within the command and keep an eye on of the Marine airground activity strength (Magtf). it truly is a real understatement to assert that the good fortune of the Magtf within the smooth battlespace depends upon the potent employment of Cis.

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Extra info for Antenna Handbook MCRP 3-40.3C

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Because of this characteristic, other stations operating on the same or nearby frequencies may interfere with the desired signal and make reception difficult or Antenna Handbook ____________________________ 2-11 impossible. However, reception of a desired signal can be improved by using directional antennas. Horizontal half-wave antennas accept radio signals from all directions. , broadside, and the weakest reception is received from the direction of the ends of the antenna). Interfering signals can be eliminated or reduced by changing the antenna installation so that either end of the antenna points directly at the interfering station.

Resonance can be achieved in two ways: physically matching the length of the antenna to the wave and electronically matching the length of the antenna to the wave. RECEPTION The radio waves that leave the transmitting antenna will have an influence on and will be influenced by any electrons in their path. For example, as an HF wave enters the ionosphere, it is reflected or refracted back to earth by the action of free electrons in this region of the atmosphere. When the radio wave encounters the wire or metallic conductors of the receiving antenna, the radio wave’s electric field will cause the electrons in the antenna to oscillate back and forth in step with the wave as it passes.

This reduces ground losses and provides the best possible reflecting surface for the down-going radiated energy from the antenna. At low and medium frequencies, the ground acts as a good conductor. The ground connection must be made in such a way as to introduce the least possible amount of resistance to ground. At higher frequencies, artificial grounds constructed of large metal surfaces are common. Antenna Handbook ____________________________ 2-21 The ground connections take many forms, depending on the type of installation and the loss that can be tolerated.

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