Views: 67 Author: Site Editor Publish Time: 2019-12-04 Origin: Site
As a wireless communication tool, walkie-talkies have their own characteristics. In one-to-one and one-to-many directional special communication, it can quickly establish communication. In the past, walkie-talkies were widely used in government departments such as the army, public security, safety, ambulance, and public utilities. With the development of the economy and the increase in people's requirements for mobile communications, walkie-talkies gradually began to be used in taxi dispatching, security, property management, construction sites, and hotels. For civil occasions. In this article, you can learn about the precautions when buying a walkie-talkie / radio equipment.
Any communication distance within 2-3 kilometers can be regarded as short-distance communication. For individual users, you can purchase civilian walkie-talkies; for unit users, you can choose low-power walkie-talkies through application; if you want to ensure the communication effect, you can choose professional routine Walkie-talkie; need to communicate in the city, and the communication distance is within 3-10 kilometers, you can consider buying a professional walkie-talkie; if the user needs a longer distance and better communication quality, you can consider using Trunking intercom, because the trunking intercom has radio network support, so the communication distance is relatively long, the effective distance can reach 1530KM.
For radio equipment, the amount of transmit power is critical. For the same wireless device, the price difference between products with high transmit power and products with low transmit power is also large. Not only that, the difference in transmission power also affects the stability of wireless network data transmission. Therefore, paying attention to the transmission power of the selected device is also an important link in the process of selecting the wireless device. Under normal circumstances, the transmission power of wireless devices should be between 25mW and 50mW, or the transmission distance between 50m and 200m. If you can't find the transmit power value on the device nameplate or manual, don't buy it at will.
Professional walkie-talkies are those with a transmission power of 4-5W and a frequency range of 136-174MHz or 400-480MHz. The talk distance of this type of intercom is relatively long, usually between 3 and 8 kilometers. It is relatively easy to operate, because most professional walkie-talkies do not have a numeric keypad, only two knobs to control the number of channels and power and volume switches. The shortcomings of professional walkie-talkies are that they are relatively large and relatively heavy, but they are water-proof, vibration-proof, anti-drop, anti-aging, and stable in performance. The price of professional walkie-talkies is higher, and it is generally used in construction engineering, property management, and factory workshops.
Commercial two-way radio refers to a two-way radio with a transmission power of 0.5-4W and a frequency range of 400-480MHz. The talk distance of this type of intercom is between 800 meters and 8 kilometers. Commercial walkie-talkies have a light and beautiful appearance. The walkie-talkie is tied to the waist through the belt clip of the walkie-talkie. Wearing headphones can free your hands and improve work efficiency. The price of commercial walkie-talkies is the same as that of professional walkie-talkies, which are generally used in shopping malls, supermarkets, retail, factories, and manufacturing.
Civilian walkie-talkies refer to walkie-talkies with a transmission power of 0.5W but not more than 1W and a frequency range between 409MHz. Civil intercom has a short communication distance and is a wireless communication device approved by the state to be used without a license. It is small in size, colorful in color and low in price. It is suitable for personal business trips, tourism and restaurants.
Amateur walkie-talkies are designed and produced for amateur radio enthusiasts. This type of walkie-talkie can also be called "playing machine". In response to this amateur personal radio service, various countries have opened up dedicated frequency bands for amateur radio sports enthusiasts. The frequency bands developed by China are 144—146MHZ and 430—440MHZ, and this band is generally used by countries around the world. Amateurs just need to buy their favorite model, apply for a local radio access license, and you can use it.
There are not many brands of explosion-proof walkie-talkies in many wireless walkie-talkie brands. Explosion-proof walkie-talkies refer to walkie-talkies that can work in flammable and explosive environments, such as in coal mines, liquefied gas filling companies, oil depots, oil fields, petroleum, Gas station chemical, petrochemical, coal mine, mine, natural gas, chemical plant, flour processing plant, flax processing plant, coal processing plant, fire fighting and other places.
Railway interphones are undoubtedly special purpose-built intercom equipments tailored by the manufacturers of walkie-talkies according to the actual work needs of the railway and railway departments. The transmission power is 4-5W, and the frequency range is selectable within 440470MHz. Due to the high noise of the train, the audio output requirements of the two-way radio are very high. The two-way radios are compressed by voice, which makes the voice quality clearer and more crisp.
The police radio is a special equipment for public security system. The frequency range of police radio is 350-370MHz, 370-390MHz. No one shall in any way steal or misappropriate the frequency resources of the dedicated radio of the public security system. Police walkie-talkies have more functions. When we buy wireless walkie-talkies, we should pay attention to the radio frequency range of the walkie-talkies. Most of them should be 400-420MHz, 450-470MHz.
The working voltage of the car radio is 12.5V. The current car voltage is divided into 12V and 24V. When the car radio is to work on a car with a voltage of 24V, a transformer is required between the car and the radio. The transmission power of the car radio is 25-50W, the power is large, and the signal is transmitted far. Car radio can only be fixed in one place, it is not as convenient to use as handheld radio. Car radios are generally used in convoys.
The specific function of the repeater and base station is to process the received wireless signal internally and then transmit it with greater power, so that the wireless communication distance is extended. In short, the repeater and base station are a wireless communication signal amplifier. As your company's business grows and grows, the demand for two-way communications is also expanding. Using a repeater and base station can enhance your communication capabilities. And through our powerful dispatcher and repeater, we can promote the coordination of system resources and expand the communication range of the two-way radio.