(1) The transmission delay is large. In the geosynchronous satellite communication system, the distance from the communication station to the synchronous satellite is up to 40,000 km , and the electromagnetic wave is transmitted at the speed of light (3 × 108 m /s) . Thus, the earth station is a satellite-earth station (called a single hop). The propagation time is about 0. 27s . (2) Echo effect. In satellite communication, the "echo effect" after speech is generated because the radio wave needs 0.54 s to rotate . In order to eliminate this interference, some devices have been added to the satellite telephone communication system to specifically eliminate or suppress echo interference. (3) There is a communication dead zone. When geosynchronous satellites are used as communication satellites, because the satellites in the vicinity of the Earth's poles are "invisible", it is impossible to use geosynchronous satellites to communicate with the two poles of the Earth. (4) There are daily interruptions, star erosion and rain attenuation. 5.1 Home Theater Speaker,Home Theatre 5.1,Wireless Surround Sound Speakers,Bluetooth Surround Sound System GUANGZHOU SOWANGNY ELECTRONIC CO.,LTD , https://www.jerry-power.com