Walkie-talkie basic knowledge and equipment recommended, in outdoor activities, the role of walkie-talkie in some cases than the mobile phone, it does not need external base station support, can be free to communicate with teammates in most harsh environments, part also has three defense and GPS functions. In Times of disaster, ICOM can not only send a distress signal, but also can be used to listen to the outside information, as PSK, know some knowledge of walkie-talkies, and reserve a pair of walkie-talkies back-up is still necessary. Yes, I do. For frequent travelers, walkie-talkies (mobile phones) this thing will not be unfamiliar. The friend of general appointment partner can have more than one, come to maintain the group cohesive. But what exactly is a good handstand for a frequent traveler like us? Two-way radio is a two-way mobile communication tool that allows calls to be made without any network support, suitable for the relatively fixed and frequent occasions of communication. How to identify civilian walkie talkies: A: Any liquid crystal display, digital display tubes, walkie-talkies on the number of keys are civilian walkie-talkies. Its frequency range is between 100 and 500 MHZ and can be shielded by the new type of shield. FREQUENCY RANGE OF INTERPHONE: In the daily use of interphone, according to the Regulations of China Radio Regulatory Commission, interphone frequency is divided as follows: Professional Interphone: v Section 136-174MHZ; U Section 400-470MHZ; Armed Police: 350-390MHZ; Coast Section: 220MHZ; Traffic Signal Lamp Monitoring, air defense alarm: 223.025-235Mhz amateur: 433MHZ; Cluster: 800MHZ; mobile phone: 900MHZ / 180MHZ; Civil: 409-410MHZ according to electromagnetic theory, the lower the frequency, the longer the wavelength, the weaker the ability of the electric wave to penetrate the building, but the stronger the diffraction ability; the higher the frequency, the shorter the wavelength, the stronger the ability of radio waves to penetrate buildings, but the weaker the diffraction ability. Therefore, in cities, because of the high density of buildings and the need for strong penetration of radio waves, the higher the frequency, the more suitable; and in open areas such as open fields or the sea, the use of walkie-talkies requires radio waves with strong diffraction ability, so v Segment (136-174 Mhz) is a good choice. The USE OF WALKIE-TALKIES: 1, when the walkie-talkie is launched, keep the walkie-talkie in a vertical position, and keep the microphone and mouth 2.5-5 cm distance. When launched, the walkie-talkie should be at least 2.5 cm from the head or body. If a hand-held walkie-talkie is carried on the body, the antenna should be at least 2.5 cm away from the body at the time of launch. 2. Don't turn it on and off more than once while using it, and adjust the volume to suit your hearing. The factors that affect the communication distance and effect of interphone are as follows: 1. System parameters (1) the stronger the output power of the transmitter, the larger the coverage area of the transmitted signal, the farther the communication distance. However, the transmitting power can not be too large, the transmitting power is too large, which not only consumes electricity, affects the life of the power amplifier components, but also has strong interference, affects the effect of other people's communication, and produces radiation pollution. The radio regulatory agencies of all countries have clear provisions on the transmission power of communication equipment. (2) the higher the receiving sensitivity of the communicator, the farther the communication distance is. (3) the gain of the antenna, when the antenna is matched to the machine, usually the antenna height is increased and the receiving or transmitting capability is enhanced. The antenna used in hand-held walkie-talkies is usually a spiral antenna, and its bandwidth and gain are smaller than those of other types of antennas, which are more easily affected by the human body. 2. Environmental factors environmental factors are path, density of trees, environmental electromagnetic interference, buildings, weather conditions and terrain differences. These factors and other parameters directly affect the signal field strength and coverage. 3. Other factors (1) insufficient battery power. When the battery is low, the quality of the call deteriorates. Serious, there will be noise, affect the normal conversation. (2) antenna matching. The antenna frequency band and the machine frequency band are inconsistent, the antenna impedance does not match, will seriously affect the communication distance. For the users, the antenna must be tightened when changing the radio antenna, and the non-manufacturer antenna or the non-machine frequency antenna should not be used. 4, the quality of the sound, mainly depends on the pre-weighted and weighted circuit, there are more advanced speech processing circuit "voice expansion circuit and low-level expansion of the application of the circuit" , which has a good effect on fidelity speech. Zhongchen Technology (Shenzhen) Co. , Ltd. is a high-tech enterprise specializing in the development, design and production of high-tech products. The company mainly produces small walkie-talkie, mini walkie-talkie, Watch walkie-talkie, small walkie-talkie. The company's harmonious, refined corporate culture, and people-oriented internal enterprise mechanism, has attracted a large number of outstanding senior technical personnel. With the preciseness style of "details decide success or failure" and the high standard design idea of "technology decides destiny" , the company has become the national leader in product technology and performance. Some products are unique to the country. For the overall strength of China's national enterprises to make an example. In the production line of Zhongchen Company, there is a group of high-quality staff who follow the enterprise values and have been trained many times. In the company's "production of a high-quality products is to create a happy for customers, " the concept of guidance, the production of a variety of models of high-quality products. Our products sell well in Europe, America and Southeast Asia. Has won wide acclaim from users. The company has passed the IS09001, IS02000 international quality management system certification. The company now has more than 100 employees, more than 30 middle-and senior-level technicians, the registered capital of the company is 3.5 million Hong Kong dollars, and the fixed assets are 2.8 million Renminbi. The company mainly produces high-tech and sophisticated products, the company has successfully launched a series of high-performance Professional walkie-talkies, Bluetooth earphones, integrated building monitoring systems and other products. In line with the "to do must be fine" concept, dedicated to the community of users to produce more, better products. With the rapid development of science and technology, the application of science and technology is changing with each passing day. All the staff of Zhongchen Science and technology uphold the spirit of "innovation, preciseness, diligence and high efficiency" and the marketing system of "honesty and win-win" . The company is willing to work with the community to seek common development!