Troposcatter is a technique where over-the-horizon distances are bridged by means of radio waves, without much delay and without the use of satellites or relay stations on the ground. Radio waves are bent back to earth by the particles in the troposphere. Only a small part of the energy with which the signal was sent is also collected again. It is predictable where the radio waves return to the earth. Distances up to about 200 km are very normal. The quality of the signal is at least equal to that of a signal sent with a relay or satellite. The troposcatter system is a point-to-point connection with a terminal on both sides of the connection. Each terminal is used for both sending and receiving. A terminal can vary in size from a portable transport box, a vehicle arrangement or a large fixed installation. The antennae of the installation are aimed at a fixed point in the troposphere which is close to horizon.
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