2 Way Radios

In the 21st century with immense development of Indian mobile industry, people are still unaware of a common technology behind it, which is a 2 way radio. A 2 way radio is very different from a broadcast receiver that can only receive content, it both receives and transmits content called as a transceiver.

The best example of a 2 way radio is a mobile phone or cellular telephone. It transmits and receives conversation at the same time, using two different radio frequencies to carry the two directions of the conversation simultaneously. Installation of receivers and transmitters at the same fixed location allowed exchange of messages wirelessly.

In the early 1907, the 2 way radio traffic was commercially available across the Atlantic Ocean. It was by 1912 when commercial and military ships carried both transmitters and receivers for the 2 way communication to real-time with a ship that was out of sight of land.

The Victoria Police were the first in the world to use wireless communication in cars, finally ending the inefficient status reports via public telephone boxes which were being used by that time. In 1923 in Australia, the first truly mobile 2 way radio was developed by Senior Constable Frederick William Downie of the Victorian Police.

Only for the reason that  these radio equipment were powerful, compact, and easier to use, even the scouts in the aircraft use the 2 way radio equipment to report back observations to troops on the ground below, to land and also make a personal report.

The 2 way radio was also expansively used by air and ground troops, both by the Allies and the Nazis during World War II.

In early years 2 way radio schemes required training operators to learn and the radio operating officer typically had no other duties than handling radio messages. But with time when voice transmission became possible, operators were not required. Now the 2 way radio equipment is simple as a household telephone to use.

The frequency used in 2 way radio is categorized as VHF (Very high frequency) and UHF (Ultra high frequency).

VHF is the radio frequency ranging from 30 MHz to 300 MHz . The frequencies instantaneously below VHF are denoted High frequency (HF), and the next higher frequencies are known as UHF. The distribution of frequency is done by ITU.

VHF radio has been used since a number of years. It is mostly used for broadcast radio functions, along with military and private business applications, nowadays they are very common. In early 950’sin the United States, VHF radios came into proper demand. As the decade passed, the VHF radios designed to pick up the signals broadcast by fledgling FM stations became very popular.

In the mid of 1960, VHF radios were popular proponents of the youth movement, with reason that many FM stations using them. By the early 1970s, most of popular radio was dominated by the presence of FM stations keeping the same status today.

After that is the UHF, the electromagnetic waves between 300 MHz and 3 GHz (3,000 MHz). These signal transmission is affected by the atmospheric moisture; solar wind; physical obstructions, such as mountains and buildings; and the depriving the signal reception. This reduces the strength of radio signals over long distances. UHF TV signals are generally more degraded by moisture than lower bands.

Along with time, UHF broadcasts on the two lower bands were discontinued. The most recent use of Internet and introduction of mass cable television made it possible for broadcast television to continue without depending on explanation to the traditional UHF band.

However, UHF radio technology is not completely old-fashioned. These waves are still active and have a place in today’s world.

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