Walkie Talkies

The walkie talkies are portable radio transceivers that allow both the transmission and reception of data, carrying out communication mode alternatively Push to Talk. Depending on the frequency used, walkie talkies can be with or without a license, having experienced the latter, for personal communications and entertainment, a large spread for the many advantages offered by not requiring or having to pay license fees or the cost of calls.

Features

The walkie talkies are transceivers, meaning that it is a transceiver device performs both functions and transmission and reception. Because some components are used for both functions, communication is half duplex (half-duplex), ie, the transmission takes place alternatively, unlike traditional phones where both can talk or listen at a time (full-duplex). Signals can be sent between two terminals in both directions but not simultaneously, while a terminal transmits the other can only receive. Although only one terminal transmits at a time, can be heard by many units.

The walkie talkies used a switch Push to Talk (PTT) to start transmission (Push to Talk, PTT). PTT devices are always listening, speaking there to press the button and not allowed to talk and listen at the same time, or hear or speak. This type of communication allows a call-to-one or one-to-many (group calls) and its use is that when one party has the button and talk, no one can interrupt you.

Many countries consider the existence of two types of radio communications:

Licensed: are bands allocated to amateur, professional and government services, and require license or administrative authorization (CB, GMRS). No license: correspond to frequencies for personal communications and entertainment that does not require any license or permit (PMR, FRS). PMR446 walkie talkies unlicensed

PMR446 (Personal Mobile Radio, 446 MHz) is an open radio frequency for use unlicensed personnel in the countries of the European Union. PMR446 radios, walkie talkies also known as walkie talkies unlicensed or free to use, are limited to 500 mW and interchangeable antennas are not allowed, replacing the original antenna, using repeaters or interconnect to the public telephone network. The theoretical range is about 3 km in a straight line on level ground.

The regulation of PMR446 band is similar to the FRS (Family Radio Service) of the United States but walkie talkies are not compatible because they use different frequencies.

PMR446 walkie talkies have many advantages, since it requires no license, no call costs or monthly fees and are easy to use. They have many applications:

Outdoor activities such as skiing, climbing or hiking. Group tours with several vehicles. Security and internal communications companies. Watch babies. Toys for children. Source: Walkie talkies