Why use a repeater in radio solutions?
What is the maximum call distance of the handheld walkie-talkie?
Commonly used hand-held walkie-talkie frequency is UHF: 400Mhz-520Mhz.The UHF radio wave transmission method is straight line propagation. The maximum theoretical talk distance of the walkie-talkie, approximately equal to the direct viewing distance of people on Earth. This is determined by the Earth’s surface and the height of the antenna. For two 6 feet people talking on the handheld walkie-talkie. the maximum communication distance is about 6.0km.
Human eye visible distance on Earth
Transmitter and receiver theoretical maximum distance
In urban areas, buildings are often the biggest obstacle to communication signal transmission. With the rapid urban development, high-rise buildings and urban modernization, the buildings are becoming denser and denser. Interphones usually cannot propagate in a straight line through diffraction and reflection. At the same time, as the buildings become denser, the communication distance of the radio will increase as the buildings are denser, the closer the communication distance. If you want to expand the distance, the most sensible way is to add a repeater to the radio solution.
Rapid urban development
The increase of buildings has a great effect on the reduction of radio. Furthermore, there is an increase in living appliances, urban infrastructure, automobiles, and various mechanical and electronic equipment. Both generate a lot of radiation. Both generate a lot of radiation. These ubiquitous radiated waves also have a serious impact on radio communications. UHF is widely used because of its excellent anti-interference and penetration capabilities. However, the propagation distance of UHF is relatively short. Therefore, adding a repeater to a radio solution is obviously the most effective and safest method.
Radio transmission received various obstacles
In addition to the times, lightning, rain, sand and dust have also reduced the radio talking distance. These make the actual communication distance much smaller than the theoretical communication distance. The way to increase the power of the hand set can also increase the communication distance.
Why use a repeater in radio solutions?
Increasing the transmission power of the radio is an easy way to increase the communication distance. But the walkie-talkie is very close to the human body. Very close, there has been direct contact. High-powered handheld walkie-talkies have a certain impact on the body. The way to increase power to increase communication distance is not the right direction.
What is radio relay station?
A radio relay station is a device that increases the radio propagation distance. Generally, the relay station of a traditional walkie-talkie is composed of a host, a duplexer, an antenna tower and an antenna. The relay station works on two frequencies, one receiving frequency and one transmitting frequency. Generally, there is a difference frequency function. The principle is to transmit one frequency and receive one frequency.
For example, if you set the receive frequency to 438.500Mhz and the transmit frequency to 431.500Mhz, when you press the talk button, the transmit frequency is 431.5500Mhz. When you stop speaking and release the transmit button, it will automatically go to 438.500Mhz On the receiving frequency, if the relay is used, the receiving frequency of the relay is 431.500Mhz. When the relay receives the signal, it is transmitted at the same frequency of 438.500Mhz. The remote intercom receives your voice on the frequency of 438.500Mhz. That is to say, the relay is to repeat the signal of the walkie-talkie once, because the high-frequency radio waves propagate in a straight line, the higher the position, the farther the propagation, generally the relay needs a certain height, the higher the TV antenna pole at home, the The reason is that the farther away Taiwan is, it is not difficult to understand. Relays are common in small and medium-sized cities. Common users include amateur radio enthusiasts, taxis, etc.
Ultra-high-height antenna increases communication distance
The relay signal doubles the communication distance
What is the role of the repeater?
The role of the repeater is to relay and amplify the signal. Used to increase communication distance and extend signal coverage.
Why choose Retevis RT97 repeater for radio solutions relay?
Large repeaters have many functions and power. However, the location is troublesome, the installation is difficult, the equipment is complicated, the cost is high, and the maintenance is difficult.
Large relay system equipment is complicated
Geographical location rental and maintenance difficulties
Equipment installation and maintenance difficulties
In some places where high power and many functions are required, RT97 is more suitable.
1.Small size and light weight of retevis RT97 repeater:
2.Easy to build system
Retevis RT97 mini repeater appliucation:
For example: farms, playgrounds, interiors, underground and underground communication, concerts, car races, go-karting competitions, outdoor gatherings, outdoor walking, cycling, and emergency use in emergencies.
Blind area coverage
Radio relay can solve many problems in communication. retevis solutions has a professional radio technology development team. If you have any ideas or needs, please contact us, we will provide you with the most professional radio solutions.
