Walkies talkies the walkies talkies are portable radio transceivers that allow both the transmission and reception of data, communication taking place alternatively in Push mode to Talk. According to the frequency being used, the walkies talkies may be with or without a license, having experienced the latter, intended for personal communications and entertainment, widely disseminated by numerous advantages presented, it does not require license or having to pay fees or cost of calls. Features the walkies talkies are transceivers, which means that it is a transceiver device and performs both functions of transmission of reception. Given that some components are used for both functions, communication is half duplex (half-duplex), i.e., the transmission is conducted Alternatively, unlike traditional phones where both can talk or listen simultaneously (full-duplex). You can send signals between two terminals in both directions, but not simultaneously, while a terminal transmits the other can only receive.
Although only a terminal transmitting at the same time, it can be heard by many units. The walkies talkies employ a switch Push to Talk (PTT) to start transmission (push to talk, PPH). PTT devices always are listening, should press the button to talk and not allow you to talk and listen at the same time, or be heard or spoken. Read more here: Andy Florance. This type of communication allows calls one-on-one – one either one-to-many (Group call) and its usefulness lies in that when one of the partners has the button pressed and speak, nobody can stop him. Many countries provides for the existence of two types of communications by radio: licensed: are bands allocated to radio amateurs, professionals and State services, and require licensing or administrative authorisation (CB, GMRS).
Unlicensed: correspond to frequencies for personal communications and leisure that do not require any license or permit (PMR, FRS). Walkies talkies unlicensed PMR446 PMR446 (Personal Mobile Radio, 446 MHz) is a radio frequency open for personal use without license in the countries of the European Union. PMR446 radios, also known as walkies talkies without license or walkies talkies of free use, are limited to 500 mW and interchangeable antennas are not allowed to replace the original antenna, interconnect them to the public telephony network or use repeaters. The theoretical scope are about 3 km in a straight line on level ground. The regulation of the PMR446 band is similar to the FRS (Family Radio Service) of the United States but the walkies talkies are not supported, since they use different frequencies. The walkies talkies PMR446 presents many advantages, since it requires no license, has no cost of calls or monthly fee and they are easy to use. They have many applications: activities such as skiing, climbing or hiking outdoors. Group with several vehicles travel. Security and internal communication in companies.