业余无线电各波段的传播规律（The distribution of amateur radio frequencies）.docVIP

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业余无线电各波段的传播规律（The distribution of amateur radio frequencies）.doc

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业余无线电各波段的传播规律（The distribution of amateur radio frequencies）

业余无线电各波段的传播规律（The distribution of amateur radio frequencies） The distribution of amateur radio frequencies Amateur radio band from low frequency to high frequency is divided into many discrete wavelengths, commonly used with HF frequency, VHF band and UHF frequency band, high frequency and microwave frequency band is used only for spare satellite communication and microwave communication experiment. The following is a brief introduction to the regular use of amateur radio waves. 1. 160m band (1.80 ~ 2.00 MHz) This is the lowest frequency range allowed by amateur radio stations. The propagation law of the band with medium wave is similar to the day close range mainly rely on the ground wave communication, night can be reflected by the ionosphere D layer for long-distance communication, the best communication time is communication on both sides at the crossroads of sunrise and sunset time. In winter evenings or at dawn, it is time to communicate over long distances with a 160m band. Because this spectrum frequency is low, need to set up large antenna, the ionosphere to its attenuation is bigger, also needs greater power to achieve remote communication, therefore, there are fewer people operation, to contact and use the CW. 2. 80m frequency band (3.50 ~ 3.90 MHz) The propagation rule of this frequency band is similar to that of the 160m band, mainly based on the mixing of F and E layers. During the summer and daytime, because of the high electron density in the d-layer and E layer, the radio waves below the frequency band can be absorbed and cannot be reflected by the ionosphere, and can only communicate between 100 and 200km during the day. At the same time, lightning often occurs in summer, making the frequency band noisy, the weak signal cannot be heard. On a winter evening or at dawn, the effect of a long-distance communication is better than that of a 160m band, and the opportunity to connect to a long-distance radio station is great. The band of the antenna is re