1. Radio broadcasting: the classic application of the first generation passive system is radio broadcasting. Through the passive system, the radio station can convert the sound signal into electromagnetic waves, sent out through the antenna, so that listeners can listen to the radio program on the receiving equipment. This application can cover a wide area, providing the public with a convenient channel for information dissemination.
2. Wireless TV transmission: The first generation passive system is also used for wireless TV transmission. Similar to radio broadcasting, television signals are converted into electromagnetic waves transmitted through the antenna, allowing users to watch television programs on the receiving device. Wireless TV transmission has important applications in some areas or specific occasions, such as outdoor activities and mobile communications.
3. Short-wave communication: short-wave communication in the first generation passive system is also an important application. Short-wave communication mainly utilizes electromagnetic waves in the short-wave frequency band for long-distance communication. Due to the characteristics of short-wave, it can realize long-distance communication between different regions on the earth under the effect of reflection and refraction in the atmosphere. This is very useful in some scenarios where long-distance communication is required and wired networks cannot be used, such as sea voyages and mountainous wilderness.
Expansion: Although the first generation passive systems are widely used, there are some limitations in their technology and performance compared to modern wireless communications. Due to technical constraints, the transmission distance of the first-generation passive system is relatively limited, the signal is prone to interference, and the transmission quality is not stable enough. With the continuous development of science and technology, wireless communication technology has rapidly progressed, and more advanced passive systems have appeared, such as the second and third generation of wireless communication systems, which have significantly improved the transmission distance, signal stability, spectrum utilization efficiency and other aspects.