In spite of technology growth in the entire world, there are still many places which are lacking in technology aspect. In rural areas, the population is less, so companies do not like to invest more in cell site. Generally, only one cell site is located which serves two or three small towns together. Because of this large distance, individuals do not get coverage in their cell phones and radio Repeaters are the device which can boost the coverage of the radios and cell phones. Repeater functions by getting one signal on one RF (radio frequency) and sending this same signal on other RF (radio frequency) concurrently. This improves both the coverage and voice quality.
Recall the old times, when people use to make trunk calls. These were the times when mobile phones, web based calling, and other sources were not so developed for communication to get happening. Even having a landline phone in that era was a matter of pride. During that time, Trunking systems were used. These systems were based on the concept wherein at one frequency channel lot many people can communicate. This is commonly seen in big commercial and army offices.
You must have seen generally militants having one phone like device through which they send and receive messages. These devices are popularly known as Walkie talkies. These two way radios enable users to send and receive messages. This can happen alternately. Users will have to first push the button to transmit the message and release the button to listen to the received messages. This alternate system of sending and receiving is known as semi duplex system.
Communication is required everywhere beet medical, paramedical, defence, politics, education, and many more. This emerging need of communication gave rise to digital mobile radio (DMR). It is a device proposed by the institute ETSI (European Telecommunications Standards Institute). This increases the speed of both data and voice transfer. It is flexible, efficient, economical, and easy to handle.
Another system coined by the institute ETSI is TETRA (Terrestrial trunked radio). It is the latest public and private mobile radio. It is based on a two slot technology known as TDMA (Time Division Multiple Access). This tool divides the channel to increase the speed of the data and voice transfer. It is seen in many service providers like transport, mining, ambulance, fire, security motives, governing bodies, and personal big family.
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