The construction of rural broadcasting in China originated in 1956. Article 32 of the "National Agricultural Development Program" promulgated by the Central Committee of the Communist Party of China stipulated that the rural broadcasting network should be basically popularized in 7-12 years, and the climax of rural broadcasting construction has been set off since then.
By 1988, the country ’s rural broadcasting rate reached more than 71%, more than 80 million broadcast speakers, and the household registration rate reached 41%. Rural broadcasting reached its peak, and it played a very active role in China ’s rural reforms and restructuring of production to households. Important role, at that time, rural broadcasting can be broadcast from village to village, and there are amplification stations in towns and villages, and there are dedicated people responsible for maintenance.
2. When did the rural broadcasting decline? What caused it?
In the 1990s, with the popularization of television sets and the reform of the township government system, rural broadcasting gradually declined, and within a few years, the original rural broadcasting line was destroyed. By the mid-1990s, rural broadcasting was completely paralyzed. So far, only a few areas in the country have retained the rural broadcasting system. In the late 1990s, with the rise of cable TV networks, broadcast and television departments around the world have set up their own cable TV networks, and quickly extended to the vast rural areas. Because the cable TV system has the characteristics of profitability, the focus of the local radio and television departments is to The transfer of cable TV has gradually reduced the investment in rural cable broadcasting, which ultimately led to a complete paralysis of the rural broadcasting system.
3. What technical methods were used to construct the rural broadcasting built in the last century? What are the advantages and disadvantages?
In the last century, the rural broadcasting network built in China was a fixed-voltage broadcasting system that used a constant-voltage 240V transmission. Each township has an amplification station (later changed to a radio and television station), which is equipped with a high-power tube amplifier. There are independent pole roads and their own lines built in the villages, using a single wire overhead, and another grounding mode to form a loop, sending broadcast signals to thousands of households, and farmers using high-sensitivity and high-impedance reed speakers to listen .
4. At this stage, is it necessary to build rural broadcasting again? After 30 years of reform and opening up, the rural economy has undergone considerable development, and the countryside in the new period is no longer the farming countryside of the last century. The rural economy and township enterprises have developed rapidly. 1. Agricultural income is no longer the main income of farmers, and the proportion of non-agricultural income has gradually increased.
5. What are the new technologies for building rural broadcasting at this stage? Whether to use the cable TV network to build rural broadcasting?
After more than 20 years of development in China's radio and television and cable TV industry, a set of radio and television networks with large coverage and mature technology have been established. Wired and wireless FM broadcasting technology has been developed for nearly 20 years, and products and technologies have also achieved very long-term development.
At this stage of development of rural broadcasting, it is entirely possible to use the cable TV HFC network to carry out broadcast signal transmission in cities, counties, and villages, and realize the "integration of the two networks" of broadcast and television. The specific method is to use the 87-108MHZ broadcast dedicated frequency band in the cable TV system to transmit rural broadcast signals. The transmission network does not require any transformation or additional investment.
6. What equipment are needed to use the cable TV HCF network to transmit rural broadcasts?
To transmit FM broadcast signals using cable TV, you only need to add an FM modulator in the front-end computer room to modulate the audio signal into an FM carrier signal and mix it with the cable TV signal for transmission. At the receiving end, FM receiver equipment, FM speaker, FM receiver, etc. are used to demodulate the FM carrier signal into an audio signal, and the vibrating horn is broadcast after amplification.
7. How many sets of FM broadcast signals can be added to the cable TV system? Will it cause interference to the cable TV system after joining FM broadcasting?
No, according to China's TV channel division standards, 87 ~ 108MHz is a dedicated FM radio transmission frequency band, and each FM radio station occupies a bandwidth of 0.25MHz, and dozens of sets of FM radio programs can be transmitted in this 20MHz frequency band.
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