The earthquake disaster in our country and subsequent connection problems in GSM networks reminds us how to communicate with our loved ones in case of disaster. How to use a radio instead of a telephone?
In the early stages of the disaster, at a point where all communication lines are cut, you can communicate with your loved ones over the radio! You can also transmit your help voice over the radio to other frequencies.
Is radio used instead of telephone?
The telephone communicates over the GSM network, while the radio communicates over radio frequencies. When the GSM network works, we can say that it is incomparable technologies. But in case of a disaster and in environments where GSM networks do not work, radios are a very serious alternative. Of course, you have to foresee the reality of the range.
After an earthquake, especially when GSM networks are not working, you can communicate by radio instead of telephone. We told you how to do it in our video. You can also continue reading the written text below the video. Enjoy watching…
shiftdelete.netWhat is wireless?
A radio is a transceiver used in communication.
They are devices that allow communication with radio signals without the need for cables.
Each radio operates in a specific frequency range. You must be on the same frequency as the person you want to connect with. The supported frequencies and ranges of the radios may differ. Ranges of unlicensed radios can vary between 2 and 20 km.
PMR446 radios have 500 mW RF output power and have the capacity to meet the needs of medium-sized facilities in closed areas, the building structure and metal density in closed areas affect the communication distance, in open areas, the talking distances can theoretically go up to 3-20 Km depending on the terrain conditions, 20 Km. There must be no obstacles for communication and the frequency must not be exposed to interference in any way.
What is PMR?
The word PMR 446 represents the initials of the words “Private Mobile Radio” as an acronym. In a sense, we can also call it a special portable handheld radio.
The number 446, which is usually used next to the word PMR, is because these handheld radios use a certain and limited frequency range (446.000 – 446.100 MHz.).
These radios are capable of transmitting at the permitted frequencies and powers in the country they are in, have relatively short range range compared to the handheld radios used by amateur radio operators and are voice only.
are low-power radio devices for communication.
Is a License Required for PMR Radio?
No, no license is required to use PMR in Turkey. PMRs are freely used in many European countries and are produced in accordance with the specifications of the European Telecommunication Standards Institute (ETSI 300 296) and are “True Telecommunications Authority Approved” in our country.
PMR Call Distance
It is not possible to limit the range of a radio to antenna output power, antenna or other features. Many factors such as obstacles, magnetic fields, buildings, hills, horizon view angle or height change the interview parameters. Even the best 0.5W radio, the range of a radio varies depending on geographical conditions, the best is 3-5 km in the city. 20 -30 Km on flat roads outside the city. You can also talk to your other distant friend at a distance. In the city, the distance varies according to the building, frequency pollution and the density of the obstacles.
What are Transmitter Systems? (Relay, Repeater)
In VHF, UHF bands, terrain and/or distance between stations are factors that make communication difficult, sometimes impossible. In such cases, some devices called relays or relay stations are used. Basically, a relay device consists of a high-gain antenna, a low-loss antenna cable, a filter unit (duplexer), receiver and transmitter parts, and their control unit. With the help of the filter unit, relay devices that have a difference between the receiver and transmitter frequencies broadcast the signals heard by the receiver simultaneously from the transmitter as amplified. Especially for handsets with limited communication range, this is the only way to make calls over long distances. Because relay stations are usually located on as high hills as possible. In this way, it is possible for devices that cannot see each other directly to communicate.