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V SAT Communication

When a communication satellite system is to service a large number of users it is desirable to reduce the cost of the earth stations to be located in each user’s site. This can be done provided the transponders in the satellite are improved and provide high output. In otherwords, a new development of low-cost microstations, sometimes called VSATs ( very small Aperture Terminals). These tiny terminals have 1 meter antenna and can put out about 1 watt of power. The uplink is generally good for 19.2 kbps, but the down link is more often 512 kbps.

In many VSAT systems, the microstations do not have enough power to communicate directly with one another. Instead, a special ground station, the hub with a large high gain antenna is needed to relay traffic between VSAT.

In this mode of operation, either the sender or the receiver has a large antenna and powerful amplifier. The trade off is a longer delay in return for having cheaper end-use stations.

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