3.7M VSAT antenna will be used as an example in this article. Typical VSAT antenna is mainly composed of hub, Satellite and remote VSAT.
1)Hub
Main station is also called center station or hub, which is main part of VSAT network. The same to normal earth station, big antennas will be used in the hub, and the diameter is often Ku-band 3.7m to 4.5m or C-band 7m to 13m with HPA, LNA, Up/Down Converter, Modem, data interface equipment...etc. Often hub and main computers are placed together, or hub is connected with the main computer by other ways, like earth or satellite. Take Antesky 3.7m VSAT antenna as an example, more information please click 3.7m VSAT antenna
In order to monitor, manage, control and maintain the full network, generally a network control center is set in the hub or other places, which is used to monitor and manage the operational status of the full network, such as real-time monitoring, diagnosis the working status, testing channel quality, responsible channel assignment, statistics and billing for each small station and hub. As the main station involves the whole VSAT operation, its failure will affect the normal work of the whole network, so the backup is set for all the devices. In order to be easy to re-organization, hub often adopt modular structure, and devices adopt the way of high-speed interconnect.
2)(VSAT)Small Station
VSAT small station is composed of small diameter antennas, outdoor unit and indoor unit. There are two types of VSAT antennas, which are prime focus antenna and off-set antenna. Prime focus antenna has the features of big diameter, but off-set antenna has the features of small diameter, good performance (high gain, low sidelobe), for its structure it's not easy to collect snow, so off-set antennas are often be adopted. Outdoor unit mainly consists of CaAsFET solid amplifier, Low-noise FET amplifier, Upper/Down converter and corresponding monitoring circuit...etc. The whole unit can be placed in a metal box and hang on the back of the reflector. Indoor unit mainly consists of modem, encoder and data interface equipment. Indoor and Outdoor unit are connected by coaxial cable, send low-IF signal and power supply. The whole equipment has the features of compact structure, low-cost, full solid, easy installation, low environment requirements, which can be connected with data terminals(computer, data communication equipment, fax, Telex...etc), and no need ground relay lines.
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