Advantages and Disadvantages of Shortwave Communication (2)
3) Atmospheric and industrial radio noise interference is serious. With the development of industrial electrification, the average intensity of radio noise interference radiated by industrial electrical appliances in the short-wave band is very high, plus atmospheric radio noise and interference between radio stations. In the past, long-distance short-wave radio communication with a few watts or a dozen watts of transmit power could be achieved, but today, 10 times or dozens of times of such power may not necessarily guarantee reliable communication. Atmospheric and industrial radio noise is mainly concentrated in the lower end of the radio spectrum, with decreasing intensity as the frequency increases. Although this kind of noise interference in the short-wave band is lower than that in the medium and long-wave band, the intensity is still high, which affects the reliability of short-wave communication. In particular, the impulse-type burst noise often causes burst errors in data transmission, which seriously affects the communication quality.
The existence of these problems not only limits the development of short-wave communications, but also cannot well meet people's increasing demands for data communications, especially for high-speed data communications services. When satellite communication emerged in the 1960s, shortwave communication was seriously challenged due to its advantages of stable channel, high reliability, good communication quality and large communication capacity compared with shortwave communication. Many important services that were originally short-wave communications have been replaced by satellite communications. The investment in short-wave communication has decreased sharply, and the status of short-wave communication has been greatly reduced. By the late 1970s, some even doubted the value of shortwave communications.
In fact, from the late 1970s and early 1980s, short-wave communication has received renewed attention. Many countries have accelerated the research and development of short-wave communication technology, and successively launched some new equipment and systems with excellent performance. In the comprehensive tactical communication plan revised by the US military in 1979, the position of short-wave communication was highlighted again, and it was listed as one of the first-line command and control communication means. Beginning in the early 1980s, the U.S. military implemented a series of short-wave communications improvement plans throughout the three militaries. During the Gulf War, the armies of the United States, France and other countries made extensive use of short-wave communications and achieved outstanding results. In recent years, the armies of some other countries have also listed short-wave communication as one of the important means of communication.
In addition, in some areas of civil communication, the application of short-wave communication also has a development trend. Especially in the past ten years, due to the application of various new technologies, short-wave communication technology and equipment have made great progress. Many of the original shortcomings of short-wave communication have been overcome, and the quality of short-wave communication links has been greatly improved. Whether the quality of telephone transmission or data transmission can be compared with satellite communication, shortwave communication has regained its youth.
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