First, public security/fire/forestry In the face of public safety practitioners scattered across a wide range of work surfaces, with irregular working hours, you have undertaken the most challenging and responsible task? How do you ensure that the contact between team members and command center and between team members is maintained at all times? The answer is to equip everyone with reliable radios. They are durable and easy to communicate, enough to ensure smooth teamwork and collaboration, as you want to improve combat effectiveness. Second, the construction industry Emphasizing the quality of the two way radio for you to bring higher efficiency and more secure security. Whether directing the crane or dispatching the pipeline handling, pressing a button will immediately connect you with the project supervisor, ensuring effective communication and coordination. If necessary, it can even go directly to the hospital to ensure that the accident on the scene is handled efficiently. Third, the hotel Convenient communication is the basic guarantee for the smooth development of the daily business of hotel service and management personnel. According to the needs of customers, the "indoor distribution and coverage system" is designed to realize the clear voice communication without blind areas, interference and can be carried out at any time in any place within the hotel, improving the work efficiency of hotel staff. Fourth, property Aiming at the communication needs of large property (community) for wireless communication and security scheduling, reasonable solutions should be formulated to provide the community with a set of cost-effective wireless coverage communication solutions with reliable communication, simple construction and convenient expansion. Meet the needs of property management, security, fire protection and emergency communication in the community, and ensure the smooth, safe and efficient daily work of management, operation, maintenance and other departments. Fifth, security Security is very important, tailored for the event to design a complete set of operational support and on-site service solutions, the solution uses high-performance commercial digital products, the use of efficient spectrum data, for the event organizers of high-density command and dispatch, communication to provide a strong communication guarantee, so that the walkie-talkie play an irreplaceable role in each event. Sixth. Supermarkets According to the large shopping mall/property covers a large area, the structure is complex, and the underground parking lot makes the communication and cooperation of the shopping mall/property staff extremely inconvenient, a set of wireless communication system which is convenient for communication, smooth communication and convenient management is developed to assist the improvement of work efficiency and management level, so that the supermarket can provide customers with quality service. Seventh. Transportation No matter the freq...

Two way radio, we are not unfamiliar, hotel and KTV waiters, parking lot security, site workers and other manpower, such a scene description may appear to be not regal; The policeman on duty, the director of the production, the director of the studio and the soldier in the field wear a two way radio with great swagger. Being a radio enthusiast, and walkie-talkies are just one of the most commonly used portable radio stations. Unlike the previous scenarios, some people mostly used it to study radio technology, road trips and the outdoors. Rather than use in the course of work. Walking on the street with a two way radio, people around with eyes after a look, in the heart to think: this is thesafeguard? Is this parking control or an undercover cop? In fact, I'm just a HAM, and I'm studying the communication test with other enthusiasts like me. Not only that, my car is also equipped with a mobile radio. While driving, or on a road trip, you can also enjoy the pleasure of communicating, of course, compared to radio amateurs. And self-driving tour enthusiasts, through the radio to communicate, to ensure driving safety and efficiency. Moreover, the power of mobile radio is generally higher than that of handheld two way radio, after all, there is sufficient power supply guarantee in the car, the power demand is large. Many of his fellow radio operators are often treated as security guards, parking wardens and waiters. Many people have asked me, what is the use of this radio? Who are you talking to with this? What do you often use it for? ... It's easy to see how isolated radio amateurs are from the people around them. There is also a view that the purpose of this thing is not to flaunt, to be cool? A radio amateur once in the park field set up DX (short wave long-distance communication), the result is attracted to a myriad of pedestrains, and the police received the alarm reason is "spy in secret send information!" . Fortunately, that dude carried the radio operating certificate and radio license at that day, after careful examination by the police, to ensure that nothing was wrong before closing the case. From this point of view, it is really difficult for ordinary people to understand the group of daily tinkering with the radio station is doing: talking to who? What is it about? Were they talking about Bravo Golf and QXX in secret service language? Indeed, the behaviour of radio enthusiasts is not as easily understood by those around them as that of fishing, photography or painting music lovers. In fact, although the number of radio amateurs in China has grown very fast in recent years, it still accounts for a very low proportion compared with some European and American countries. As of 2015, there were only over 60,000 radio amateurs legally registered in China, including grade A, B and C. According to the data, the top three countries in the number of radio enthusiasts are Japan, the United States and Germany. Among them, the largest number of radio ...

Two way radio is the main tool for amateur radio communication. HAM hopes to have a high-performance radio system to send out strong radio waves and receive 59+ complimentary signal reports from the other side. Different products have different properties. Today I'll take you together to comb a variety of walkie-talkie comparison: Amateur radios VS Professional radios Many new HAM envied professional radios at first, believing that professional intercoms used by the military and police had high performance and long communication distance, while amateur radios, since they were used by amateur individuals, naturally had poor performance. In fact, the professional and amateur in the two way radio does not mean the professional degree of manufacturing technology but the user group is different, amateur radio is not a toy. Different user groups have different application characteristics and needs. The same function may be essential for one type of users and cumbersome for another. For example, amateur radios generally provide the function of direct input of the frequency keyboard. For HAM, this is a very necessary and convenient function. You can directly input the frequency just like making a phone call. Professional users use a handful of fixed frequency points, and the call is also in the inner circle, the preset channel can completely do not need to enter the frequency temporarily, the keyboard to change the frequency function may also cause misoperation to change the current communication frequency, resulting in the failure of communication. Many industry users who use professional radios don't even have a concept of frequency. Two way radios are just a communication tool like mobile phones. Setting the frequency was a pleasure for HAM, a hobbyist, but for business users it was a tedious technical task that required a professional to do, so most professional radios were designed to be computer programming dummies as easy to use as possible, but also easy to manage. In terms of function, amateur radios are definitely more powerful than professional radios. Amateur radios generally have functions such as frequency display, manual panel frequency adjustment, frequency scanning, received signal strength display, multi-gear output power switching, etc., which are lacking in professional walkie-talkies, not to mention advanced functions of amateur models such as dual-band operation, broadband expansion reception, dual-receive channel waiting, etc. Some brand enthusiasts say that some foreign new high-end professional radios can increase panel frequency setting function FPP. There is still a big difference between FPP and amateur radio's VFO mode, which freely uses the frequency. FPP is just equivalent to providing manual channel programming without computer programming. Moreover, even professional radios with FPP function still cannot carry out continuous frequency scanning. The scanning function of professional machines is limited to preprogrammed fix...

Today, I will mainly talk about some advanced skills and precautions for the use of two way radio, as well as the introduction of key knowledge points such as the skills and steps of the two way radio function setting. Advanced techniques for using two way radios 1, receive/send different frequencies: Receiving and transmitting can be at the same or different frequencies. In general, receiving/transmitting at different frequencies has higher communication quality than receiving/transmitting at the same frequency. Setting method: First, switch the operation mode of the intercom to the frequency mode, and first program frequency; Then use the "function key + number key" to call up the setting function of receiving/sending different frequencies, generally there are two or three options: +, -, same frequency. "+", the transmitting frequency is higher than the receiving frequency based on the current receiving frequency; The so-called "-" means that the transmitting frequency is lower than the receiving frequency. Select "+" or "-" according to whether the transmitting frequency is higher or lower than the receiving frequency. Then adjust the function of frequency setting by "function key + digital key", and set this value as the difference between the required receiving and transmitting frequencies (e.g. The receiving frequency is 145.35, and the transmitting frequency is 144.35. The transmitting frequency is 1M lower than the receiving frequency, so it should be set as "-" and the difference frequency value should be 1M). Then, the above data is stored according to the channel storage method, that is to realize the receiving/sending of different frequencies. Some machines have two storage keys for the receiving frequency and the transmitting frequency. At this time, first switch to the frequency mode, input the receiving frequency and store with the receiving storage key, and then input the transmitting frequency and store with the transmitting storage key. 2.CTCSS: In the field of walkie-talkies whic used by our normal people, simple communication encryption can be achieved by the following methods: (1) Analog encryption: In the normal transmission of the signal attached to another human ear can not hear the audio signal, said the audio signal isCTCSS, sending and receiver set CTCSS frequency should be the same. When the sender attached a CTCSS, only after receiving the same signal, the receiver can open the front stage of the noise circuit, so that the signal is transmitted to the backward stage circuit, demodulation of the normal audio signal, the user can hear the normal audio; Otherwise, if the receiver does not set the CTCSS or does not match the frequency of the sender's CTCSS, it can not open the noise circuit, of course, it can not hear the normal audio signal. Setting method: First set the communication frequency; Then press the "function key + digital key" to call out the CTCSS setting operation; Then adjust the CTCSS as needed; Store to ...

With the improvement of living standard, mobile phone has become a very important communication tool in people's life. But as a special communication tool, two way radio brings convenience to people's work and life, and is understood by more and more people. The main function of two way radios and mobile phones is voice call, but they still have many differences, mainly reflected in the following aspects. 1. Different call modes. two way radios can be used for point-to-point communication and point-to-multipoint communication. Mobile phones can only be used for point-to-point communication. 2. The different user groups. Two way radio users are mainly industrial, commercial, military, government certain systems and outdoor enthusiasts. Mobile phones are used by ordinary consumers. 3. Communication ability is different. Two way radio can not only rely on the base station to carry out ultra-long distance communication like a mobile phone, but also carry out long distance communication in a certain range apart from the base station. Mobile phones rely on base stations to communicate. 4. Different use environments. In addition to use in the daily environment, two way radios can also be used in some special environment, because the two way radios have certain anti-fall, dust-proof, waterproof functions, can also be separated from the base station in the case of long-distance communication, so that it can be used in the constructure plant, mine, outdoor, earthquake disaster areas and other environments. In order to make the mobile phone more portable design will make it smaller, it is difficult to take into account its anti-fall, dust-proof, waterproof performance, people should take certain protective measures in the process of use, such as by sticking toughened film, into the mobile phone case to protect the mobile phone is not easy to be broken. Put in a waterproof sleeve in rainy days to prevent the phone from flooding.

DMR radios differ from common radios in working principle, communication mode, coverage, communication quality, and application scenarios. First of all, DMR radios use digital signal transmission technology, while ordinary radios use analog signal transmission technology. Digital signal transmission can avoid the noise and distortion in analog signal transmission, and achieve higher speech quality. In addition, digital signal transmission supports various communication modes, including point-to-point communication, group call, and broadcast, meeting communication requirements in different application scenarios. Secondly, DMR radio (GT-10D) adopts time division multiple access technology, which can realize multiple users using the same frequency at the same time, greatly improving the communication capacity. Ordinary two way  radios use analog signal transmission technology, only one user can occupy one frequency, the communication capacity is relatively small. Thirdly, DMR radio (GT-10D) has a wider coverage. Since digital signal transmission can achieve a wider coverage area with the same transmission power, DMR radios (GT-10D) can cover a wider area with the same frequency band and power. Finally, the application scenarios of DMR radios are more extensive. Because of its higher communication quality, larger communication capacity and wider coverage, DMR radio has been widely used and promoted in public safety, transportation, electric power, petrochemical and other industries. The common two way radio is more used in the field of personal consumption, such as outdoor sports, tourism, commercial use. To sum up, there are great differences between DMR radios and common radios in working principle, communication mode, coverage, communication quality and application scenarios. Because of its higher communication quality, larger communication capacity and wider coverage, DMR radio has been widely used and promoted in public safety, transportation, electric power, petrochemical and other industries.

Usually a new HAM will ask how far can a certain type of two way radio call? To be honest, it's hard to explain every time I'm asked this question. At the same time, it also reflects the problem that HAM does not understand the walkie-talkie. So haow far is the communication range of a two way radio, and what should we say? Today we will briefly talk about the wireless intercom call distance. Why can't we answer the question of how far a device can be called? That's because in the field of wireless communication, there is no "distance", because there are so many factors that can affect how far a wireless signal can travel. Commonly used radio walkie-talkies generally use 130-170; Two frequency bands, 403-470, are also allowed to be used by individuals or units by national law. Under normal circumstances, the two frequencies are spread in a straight line, the sea is the marine radio ideal communication environment, generally there will be no obstacles and very little interference, but in fact, in the sea handheld can only pass about 20 nautical miles, that is because the earth is round, too far away from the middle will be blocked by the sea water. (So the higher the antenna, the farther the call will be.) Usually in urban use, obstacles are the biggest factor affecting the distance of the signal. The actual communication distance of the walkie-talkie with the power of 5W in the city is generally only within the range of 2 ~ 5km. In the high ground, more buildings or more sealed indoor, the call distance will be shorter. However, when there is a system base station support, the radio can reach more than ten kilometers or even dozens of kilometers, (if two intercom are in the height, can also reach more than ten kilometers). At the same time, due to the different frequency band characteristics of VHF and UHF, the communication effect is different. UHF is more suitable for urban use because of its higher frequency, better penetration and worse diffraction compared with VHF. On the contrary, VHF is more suitable for plain area because of its lower frequency, better diffraction and worse penetration.

Online bought walkie-talkies, as long as the purchase channels are regular, there is no problem, are legal.The problem is usually in usage, as if you can buy a car without a license, but you need one to drive on the road. After the two way radio is bought back, if you want to use it must occupy the frequency, then the frequency spectrum resources belong to the state, use the frequency according to the national laws and regulations, such as application or lease frequency, some frequency need the corresponding license can be used, some only specific units can use, arbitrary use of frequency will be punished by the relevant national supervision and law enforcement agencies,there may even be criminal liability. In addition, our country also has clear requirements for the transmission power of the two way radio, can not be arbitrarily increased transmission power. However, as two way radios are widely used in the private sector, 409MHz is regarded as the public frequency by the state. There is no need to apply for or lease the frequency. Only the transmission power of the two way radios is ≤ 0.5W and the spurious transmitter is ≤50uW, such as Senhaix 1420. Or consider getting an amateur radio license, which is universal, so you can talk to other hams on amateur frequencies and enjoy the thrill of surfing the world on the airwaves. Finally, not all of the 409M was used on the public frequency. To be precise, it started at 409.750 and was a channel every 12.5KHz. The last channel was 409.9875.

Nowadays, more and more novice hobbiests prefer digital radios when they choose two way radios. Of course, they do not even know what digital radios are. They will say that digital radio is dual-purpose,  and isbetter than analogue radios. Digital radios have long been popular, and enthusiasts often argue about which two way radio to choose. If you are a new Ham, you must have considered your choice, and this article can help you. Analog radio and digital radio Analog radio is traditional. It has been around for decades and made great contributions to human society. It entered commercial use in 1933, and of course it had been used in national defense for more than two decades before that. At that time, radio greatly improved the efficiency of information transmission, communications equipment business processes were rapidly evolving trends, radio was the most superior mode of communication, all fields depended on it. After decades of development in analog radio, it had already reached a point where the trend was reaching its peak, so experts created and invented more advanced digital radio systems. Analogue radio is no longer scalable. digital radio is completely different. It uses better encoders, improves sound quality at a certain level, and transmits data while talking, so it is relatively expensive. The emergence of digital radio makes the wireless communication field have a development trend of leaps and bounds compared with simulation, there are mainly the following kinds: 1, larger coverage area; 2, video and voice communication quality improvement; 3, a variety of colorful background management functions.  But analogue radio also has some distinct benefits. Analog radio has been the primary and only method of communication networks for a long time. Although the current digital technology is becoming more and more popular, most amateur radio enthusiasts still use analogue radio technology to communicate. However, with the continuous development trend of digital technology, more and more technical professional radios have already begun to transform into digital radios. Digital radios provide many new functions for business service customers. Data encryption, one-to-one communication. Originally, mobile phones used analogue radio, but as more and more people began to use mobile phones, communications operators were forced to move to data, which offered greater capacity and new uses. What you can get depends on how much you can pay, which means you can buy a well-known brand and model specifications of wireless walkie-talkies. For example, DMR digital radios have at least 30 percent better battery life than analogue radios, which is very useful. The standard analogue radios, when you get close to the edge of the data signal, will start to abate, and at this point you can hear a lot of noise, even intermittent data signals, whereas the digital radios, no matter how far you get away as long as the data signal coverage area, the quali...

In China, almost all sports use commercial walkie-talkies or amateur radios as the main machine, and there are few professional SPORT RADIO. Professional sports radios are usually more demanding than home unlicensed public walkie-talkies, with better fall resistance, waterproof, and longer communication distances. Fujian Senhaix Electronic Technology Co., Ltd. has launched a Senhaix 8800 professional sports radio for the sports intercom market, and provides powerful features and hardware configuration beyond the general sports intercom and commercial machines. This product not only has the transmission power performance of commercial professional radio, but also supports VHF/UHF dual-band operation and even includes FM radio and aviation band reception function, which is even as good as amateur radio in function. Shape and design Senhaix 8800 has an impressive appearance, from color to structural design and additional features that are markedly different from common commercial professional and amateur radios. It is designed specifically for sports applications and the outdoors. SenhaiX-8800 has a bold, orange-red palette with black lines and keyboard accents. Foreign fire intercom specially used yellow and fluorescent green shell is the same reason. At the same time, its keyboard has a backlight, regardless of light and dark environment can be easily operated. The shell of the Senhaix-8800 is made of a high-strength material, and the bottom of the shell is specially designed with a soft TPU material wrap, which can play a certain role in cushioning the fall and improve the anti-fall ability of the product. At the headphone jack and battery contact plate, the Senhaix-8800 is designed with a rubber plug and apron to provide some waterproof function, enhancing the waterproof performance of the product. The Senhaix 8800 also has a distinctive battery system design. First, the combination of the battery block and the walkie-talkie is not the common pressing bayonet structure, but the use of a screw directly locked. This type of bonding is more secure, and the tightening of the screws increases the closeness between the battery and the body, which also improves the waterproof performance. Second, the battery block itself comes with a separate Mirco USB charging port (complete with charging status indicator) that can be charged using phone in vogue chargers or even power banks. The Senhaix-8800 has a simple top layout and only one volume/switch knob for operation. Knob around the larger space, on the one hand is convenient for the user easily use, another is convenient for the user to operate with gloves. Two way radio static Settings and power Settings are completed through the menu, and channel/frequency selection is performed through panel buttons, which can prevent users from misoperation and communication loss to a certain extent. The Senhaix-8800 has an optimized, very distinctive and creative flashlight design on the bottom, and a dedicated flash...