Monday 29 December 2014

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Two of the most popular Trunking systems are, which is analog, and Tetra, which is digital. The latter is the result of recharge api a European standard, and its US equivalent is the APCO25. They offer other possibilities besides voice communication, such as sending short messages, data, wireless public telephone networks.

This service, also known as paging, paging and https://www.fiverr.com/duaneluna paging allows the location and sending messages to a user who has the appropriate terminal, popularly known as seek or beeper.


This is a unidirectional communication, from which it wants to locate to be located. As in mobile telephony, each area is covered by a ground station that https://myspace.com/nicolerose41 serves users located within its recharge api coverage area.

The first systems only emit recharge api a sound or beep, indicating that someone was trying to tell us something. Then, if so decided by the carrier seeks, established a https://id.theguardian.com/profile/garrettmurray telephone.

It is very useful for professionals, who must travel and are not always reachable, for example, doctors, technicians, etc. In a second phase, were more http://www.codeproject.com/Members/lillieolson sophisticated systems, messaging, application of codes to maintain security.


Calls to groups, everyone. Serves to know the position of a mobile receiver. The best known system is the GPS (Global Positioning System). It is a https://www.linkedin.com/pub/miriam-thomas/ab/3b3/74a constellation of 24 satellites, divided into six orbital planes of four satellites each.

Each satellite broadcasts a signal with its position and time, encoded with its own code, allowing satellite that we receive each transmission. Its speed is twice https://www.librarything.com/profile/wilfredbuchanan around the Earth in one day, passing a given point twice a day.

Their distribution ensures recharge api that anywhere on Earth, at any time of day. You have direct view of at least four satellites, allowing determine latitude, longitude and http://violethuff.deviantart.com/ height, and have a time reference.


The receptor responsible for collecting the signals from the satellites and process, is somewhat larger than a mobile. The system belongs to http://www.kongregate.com/accounts/lauratucker the Department of Defense, and recharge api can operate in two modes: SPS and PPS.

First is of lower quality (has an error of about 100 meters), and can use either. Second instead requires authorization from the Department of Defense for use. His mistake is a few meters. Anyway, there are http://glennhunt.newgrounds.com/ receptors that work together with a reference receiver and decrease these errors meters or centimeters.

Depending on the circumstances. In this case, a receiver located at a point that we know the exact position. When our receiver recharge api receives data from satellites, makes the relevant calculations and obtained a position.

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