Sanmenxia where selling campus radio system equipment monopoly wholesale common campus radio transmission mode constant pressure (constant resistance) transmission, wireless FM transmission, wired FM transmission in three ways: Audio Cable. ① The most common is the the cable constant pressure audio twisted pair transmission: The advantage is terminal cheap, simple structure; drawback is that each classroom are required wiring, the system is configured in strict accordance with the principle of power matching and impedance matching, scalability, can not stereo broadcast program capacity is small (only a set of programs) that can be transmitted, broadcast different content at the same time can not be done by grade. Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Milan sun, Zheng * City Market Building 5, Unit 2, 208 the ② wireless FM transmission: The advantage is the simple construction, no wiring, inexpensive, can be realized multi-channel broadcasting; disadvantage is the need to take up space frequency resources, frequency need to be approved by the radio management departments principle susceptible to outside interference, relatively poor reliability. The ③ cable coaxial FM transmission mode of cable: cable FM frequency division multiplexing transmission work of cable based on the cable TV coaxial advantage can achieve multiple simultaneous transmission (W Series 100 channel receiver) can strong expansion, the terminal speaker as long as the receiving level can be unlimited number, the power limit. Cable technology in China has gone through nearly 20 years of development history, has fully matured, inexpensive accessory products, stable performance. The the wired FM radio and closed-circuit VOD, dual control, CCTV Total cable transmission, no wiring, construction is simple, scalable transport number of programs can achieve the intelligent broadcast addressable control functions; drawback is wired FM transmission mode is based on the weak signal transmission work, FM Speaker with external 220V AC power, but the schools in the classroom can provide a stable 220V AC power. Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Unit 2, Building 208, Cheng * City Market Milan sun above several technical and general schools should be optional wired FM transmission, cable FM radio scalability high performance and low cost, and may with closed double control, VOD, teaching, and campus Multimedia "multi-play". The general characteristics of the campus radio system: Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Milan sun, Zheng * City Market Building 5, Unit 2, 208