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TM 11-5895-1179-13 * EE132-EA-OMP-010/E106 KY883 * TO 31S1-2GSC-161
Section III. PRINCIPLES OF OPERATION
1-13.
General Theory
a.
Communications Links Overview. Various satellite communications links are shown in figure 1-4. Each surface
vehicle, airplane, ship or ground station has a computer, teletype unit, or other similar device that uses and creates binary
data in the course of talking to other similar devices that could be anywhere in the world. These devices are linked together
by several means, including the satellite links. Normally, the purpose of the encoder-decoder is to provide coding and
decoding functions that improve the reliability of digital data transmissions over the communications link (Mode A). The
encoder-decoder can also protect a communications channel when an enemy is attempting to jam communications (Mode
B) and when signal outages occur while ships in the communications channel switch their antennas (Mode C).
Figure 1-4. Satellite Communications
1-8

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