DISADVANTAGES | LIMITATIONS | PROS | SATELLITE COMMUNICATION

Limitations of a satellite e-mails system are determined by the technical features ofthe satellite and its orbital factors. Effective e-mails satellite methods are limited by two things. Satellite transmitter energy on the down links and recipient understanding on the up links. Some early communications satellite  have been limited by low-gain antennas.

Power
The quantity of energy available in a powerful satellite is limited by the body weight limitations required on
the satellite . Beginning e-mails satellite  were limited to a few hundred body weight because of launch vehicle
payload restrictions. The only possible vehicles is the worthless screen. (Total power generation in the earlier satellite  was less than 50 h.) As you can see, the RF energy result is severely limited; therefore, a relatively inadequate sign is approved on by the satellite  on the down web link.

The weak transmitted sign is often reduced by duplication problems. This results in a very inadequate sign being available at the globe gadgets. The stage of signals acquired from a satellite  is much like the combination of exterior ecological interference and internal interference of standard gadgets. Unique techniques must be used to extract the preferred information from the acquired sign. Huge, high-gain antennas and special types of pre amplifiers fix this problem but add complex-ness and size to the globe terminal. (The smallest terminal in the protection interaction methods network has effectively an 18-foot antenna and weighs 19,500 body weight.) Development of more efficient types of and pleasure of weight restrictions have allowed improved satellite  performance and increased capacity.
Receiver Sensitivity
Powerful transmitters with incredibly online antennas are used at globe programs. Even with these large transmitters, a lot of sign loss occurs at the satellite. The satellite  antenna gets only a small amount of the approved on sign energy. A relatively inadequate sign is acquired at the satellite  recipient. This presents little problem as the strength of the sign acquired on the up web link is not as essential as that received on the down weblink. The down-link sign is essential because the sign approved on from the satellite is very low in energy. Development of high-gain antennas and incredibly delicate gadgets have helped to fix the down-link problem.
Availability
The availability to a satellite  to act as a connect place between two globe gadgets depends on the locations around the globe gadgets and the orbit of the satellite . All satellite, except those in a synchronous orbit, will be in view of any given pair of globe programs only part of plenty of your energy and effort. A lot of period of your energy and effort that a non synchronous satellite in a round orbit will be in the ZONE OF MUTUAL VISIBILITY (the satellite can be seen from both terminals) depends on the size at which the satellite  is circling. Elliptical exerciser orbits cause the satellite zone of mutual visibility between any two globe gadgets to differ from orbit to orbit. These times of mutual visibility are foreseen.