Two Way Radios

A two way radio is a radio that can transmit and receive signals. They are commonly referred to as transceivers. Two way radios differ from the broadcast receivers since the latter can only receive content, but cannot send. The most important feature of a transceiver is that it allows radios to communicate in a conversational form with other radios that are within the same channel. The technology of transceivers has been used over the years to enable people to communicate information across geographical locations. This has brought an apt solution to the need for mail sending through post office boxes or the need to go somewhere physically in order to send and receive information. 


Different radio equipment manufacturers have availed diverse types of equipment to aid in the execution of such communication. The equipment comes in the form of mobile gadgets, stationery transceivers and other diverse transportable configurations. An example of these mobile radio devices is a walkie-talkie.


A notable feature of the two way radios is the fact that they carry out one action at a time. It is either sending or receiving, but not both. This is referred to as half-duplex mode. Such devices are normally fitted with buttons that enable the user to switch between receiving and sending. Holding the button down would generally activate the transmitter so that the user can send the information while releasing the button means the device is receiving content. 


Interestingly, advancements in technology have brought in two way radios that can transmit and receive at the same time. Examples are mobile phones and telephones. That is why it is possible to speak on the phone and have the user’s sound transmitted to the user on the other end while at the same time hearing what the other user is saying. This technology is referred to as full-duplex mode. Such devices are equipped with two channels at the same time, thus enabling one channel to send while the other receives.


The two way radios include the famous digital and DPMR radios. These technologies have been refined to offer high fidelity content transfer services across the globe. The use of these technologies has also enabled the transmission of large amounts of data, securely and quickly. 


Digital radio, commonly referred to as Digital Radio Broadcasting was brought in by experts to replace analogue ways of radio communication. Deducible from its name, this technology enables the digitization of information ahead of transmission through specific frequencies. Digital radio allows for massive compression of signals to diverse formats that offer enhanced clarity. The compressed signals are then transmitted using digital modulation method. The main objectives of utilizing the digital modulation method are to enable sending of more information within a particular channel, reduce fluctuations in the transmission of the signals, provide greater efficiency and to open room for extra datacasting solutions to be implemented.


The implementation of digital radio is fast picking pace in recent years and has been able to fill in a number of deficiencies hitherto experienced with the analogue transmission services. In terms of usage, the analogue radio transmission is still used in a wider scope than the digital radio, but this trend is slowly changing with the increasing growth of digital radio, particularly with the online radio.  The digital wireless radio systems are not so many either. According to ITU certifications, in 2012 there were only four systems that had been issued with full recognition. One of these companies, Digital Audio Broadcasting (DAB), has worked over the years in an effort to provide a fully featured digital radio transmission system. The four systems had two from Europe, one from Asia and one from America. 


On the other hand, digital Private Mobile Radio (dPMR) is a standard that was developed by ETSI. This radio protocol targets incredibly effective solutions while at the same time bringing in lower costs and reduced technological intricacy. The technology used is purely digital and enables the users to send large signals. The dPMR is also equipped with full-duplex communication thereby enabling the user to transmit and receive data. While some other protocols utilize wideband technology to transmit and receive data applications, dPMR uses narrowband of 6.25kHz. In fact, this has come out to be the most notable capability of this protocol.


The dPMR comes in a number of levels namely, dPMR446, dPMR Mode 1, dPMR Mode 2 and dPMR Mode 3. The use of dPMR446 is basically in peer-to-peer operations and comes license-free. The Mode 1 dPRM is the general use peer-to-peer, Mode 2 is the protocol standard while Mode 3 is the full featured dPRM. Mode 3 offers all the functionalities offered by Mode 2 and allows boasts many other features that make it quite a robust protocol.  


Considering the numerous advantages derived from the use of two way radio technology, a lot has been achieved in terms of real time communications over the years. Even though digital and dPMR technologies have not overtaken analogue in terms of worldwide use, the more the technology is embraced, the more it becomes easier to communicate and share information. 


There are many more companies working on further advancement of two way radio technology to improve communication and transfer of data. Moreover, many government institutions are also setting up platforms to allow for two way digital communications, resulting in a high speed growth of the digital radio as well.