A brief explanation of some satellite terms

1. Satellite communication:
Communication between two or more earth stations using artificial earth satellites as relay stations to forward radio waves.

2. Synchronous satellite communication A communication satellite that orbits the earth in a circular orbit around 36,000 kilometers above the earth's equator. Its satellite orbital period around the earth is a "stellar day", which is synchronized with the earth's rotation and is therefore It is relatively stationary, so it is also called a stationary satellite, fixed satellite or geostationary satellite, and its orbit is geosynchronous orbit (GEO).

3. TV broadcasting:
The use of radio waves or wired circuit networks to transmit live visual images in real time or broadcast after storage and editing, and broadcast them in the form of programs for the audience to watch. Dissemination of sound to the audience is broadcasting, and dissemination of images and sound is television.
The use of geostationary satellites to forward broadcast and television signals to a wide area allows users to use simple and inexpensive receivers to watch TV and listen to the radio system, which can be received by individuals or collectively.

4. Cable TV:
That is, the TV program is transmitted to the TV broadcasting system in the audience's home through the cable. It is generally composed of three parts: front end (in-station equipment), transmission system and user network.

5. Communication satellite:
Artificial earth satellites as radio communication relay stations. It relays radio signals to achieve satellite communication between satellite communication earth stations or between earth stations and spacecraft. Its space segment is satellite and measurement and control station, which can transmit telephone, telegraph, fax, data and TV information. According to its running track, it is divided into low track, medium track and static track.

6. Mobile communication:
Communicate the communication method between mobile users and fixed-point users or between mobile users. A new communication method for personal mobile users to communicate with anyone at any time and any place.

7. Satellite mobile communication:
Communication between mobile users or between mobile users and fixed users using communication satellites as relay stations. The system is generally composed of communication satellites, gateway earth stations, control centers, and mobile terminals.

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Earth Leakage Breaker ELCB

ELCB is an acronym for Earth leakage circuit breaker, which is a device placed inside a water heater, commonly referred to as ELCB electric leakage breaker. This circuit breaker has the function of disconnecting the device from the circuit whenever an electrical leak occurs through the human body when touching the electrical parts of the device.

ELCB is to limit the incident of electric shock inside the machine, disconnecting the power when there is a problem, ensuring safety for human life as well as fire and explosion prevention.

How many types of ELCB?

ELCB is often used in both civil and industrial applications.

For the domestic electricity system, the installation problem is not difficult, but in industry, the anti-shock for workers and the prevention of electrical leakage for electrical equipment with large capacity requires a bridge. Automatic anti-shock, high-power leakage protection, and often has a much higher price.

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