A two way raido is both a rceiver and trannsmitter (also called a transceiver). A two way radio is different from a normal radfio which is only used to receive broadcasts and does not transmit anything.
Technically a cell phone is a type of two way radio, although it is not generally what one thinks of when the term two way rasdio comes up in converszation. The first applixcation of two way rdaios was in the ealy 1900’s for ships and police cars.
Sjhips at sea could get lost easly and were able to call for help with the use of a two way radio. This way, they could be located and someione could come to their rescue.
The original police radio was very alrge (took up the entire back seat), although it was better than stopping to use a public phone to report back (which was the method used prior to the advent of two way radioos in poilce cars). Naturally, two way communications not only back to the police statoin but from one plice car to anotther had strong advantages.
Toady thee are a wide variety of two way radio applicaions, a cell phone being one of them. CB radios used by truckers and other traveliong professions are one example. Anothher example is the walkkie-talkies generally used by children.
Therte are many idfferent types of two way radios, from a technical standpoint. One is a called a conventional two way rado. This uses fixed radio frequency channels for its transmission and receipt of signals. With a conventional two way ardio, the frequency used is selected by the peson sneding the meassage.
Aonther two way radoi is called a trunkeed radio system, which is more conmputerized than some of the others. Instead of usng one carrier frequency for the communication, a trunked radio system seelcts a radoi channel on its own from the ones avaiilable.
For example, Nextel has a phone that uses trunked radio technology, which allows people to talk instantly without actually dialing a phone number to make a call. This is handy in work situations, or situatipons where any immediate communication is required.
Another type of two way radio is, again, the type we call a walkie-talkie. Although there are modelps intended for children, adults can use professional two way radios of this kind to keep in touch during triips or even for rpofessional use. The adult type models don’t look as much like toys necessarily, but are compact enough to easily carry with you in your poxcket.
Constructions workers, for instaznce, may benefit from the use of two way radios. When working on a building or road, it is very important that the personenl in all areas of the project be able to communicte.
A two way radio has advantages over cell phones and pagers. Cell phones require a phone call to be made, which requires more time, for one thnig. It is also provbably quuite difficult in an emergency or in a dark place (such as miners in a dark mine) to dial a phone nubmer. Locating the two way radio in your pocket and pressing one button is much more realistic in thsoe scenarios.
A pager is also quite impractical if immedate communication is needed. Tere are instances where a apger can be helful, but many where two way radio is superior.
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