Satellite Phone

The satellite phone or the Satphone directly communicates with the LEOS or the low earth orbit satellites. These are researched to be not only much faster, but offer the user a better range of coverage too. These satellite- cellular phones are wireless devices and the functions are executed with the help of cells. This is why they are also referred to as cell phones. The operation of these phones is carried out via the division of the whole network area into smaller areas, with individual antennas installed in each segment or area. These segments or towers connect the range between each movement of the cellular phone.

Understanding the 'Ground' Work

The coverage is offered as the cellular phone user keeps moving and enters from one cell range to another. When the instrument crosses over the borders, it actually transmits a signal to the Mobile Telephone Switching Office. The control channel the database of the Mobile Telephone Switching Office (MTSO) helps the satellite phone or the Satphone to relocate within the new cell area or coverage range. These phones use the Low Earth Orbiting (LEO) satellites that are registered for usage of a particular company. Whenever a Satphone is switched on, the instrument transmits a signal to the satellites of the designated or registered group that the phone company is affiliated to.

The 'Satellite Angle'

While using a satellite phone when a person uses the handset, he or she unknowingly sends up a signal to the nearest orbiting satellite and this satellite in turn, connects to the ground station or 'gateway'. The ground station then connects the call to the destination number. It is basically a mobile handset that enables the user to communicate via direct connectivity with the communication satellites orbiting the earth. The range or coverage offered by each of the Satphone companies largely depends on the infrastructure and architecture of the particular system. The coverage may hence, be applicable anywhere around the globe or restricted to use within specific regions.

The Equipment

The Satphone mobile equipment is also referred to as the connecting terminal or ground station. It varies widely and the existent range of phone handsets come in a size and weight not very different from the earlier ones, but today they flaunt a retractable antenna. It is very popular on expeditions and journeys that take one to some remote area. The users enjoy a connectivity with the outside world even in regions or areas where regular terrestrial cellular service is not available. The equipment also includes a fixed installation. The ship-board usually includes rack-mounted electronics and a steerable antenna. The purpose is to automatically track the overhead satellites.

The Reception

The satellite phones are not very popular with users for their indoor connectivity. The possibility of a consistent signal near a window exists only if the roof is sufficiently thin. They come with 'connectors' for external antennae. These are installed in vehicles and buildings tops. These phones are connected via special 'country calling codes'. Some satellite phones enjoy connectivity via the satellites in the geo-synchronous orbit of the earth and thus, a global coverage! The disadvantage of Geo-stationary satellite system is that the required 'sight' between the phone and the satellite is obstructed in the presence of hills and forest cover and the user has to locate higher ground to be able to effectively use the phone. In the Low Earth Orbit service, the obstacle ceases to remain one as soon as another satellite passes overhead.

The Satphone is built under license and contract and the OEM operators influence the selling price. The cost of calls is usually quite high.