Digital Mobile Radio
  • How far is the communication range of a two way radio?
    How far is the communication range of a two way radio? on April 12,2023.
    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.
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  • Is it legal for me to buy a two way radio online and use it?
    Is it legal for me to buy a two way radio online and use it? on 2023-03-18
    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.
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  • Analog radio or digital radio, which one is better?
    Analog radio or digital radio, which one is better? on 2023-03-09
    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...
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  • Senhaix 8800,  a professional sports radio
    Senhaix 8800, a professional sports radio on April 10,2023.
    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...
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  • How to choose a handheld two way radio? Can one use two way radio without a license? SenhaiX 8800, a popular two way radio.
    How to choose a handheld two way radio? Can one use two way radio without a license? SenhaiX 8800, a popular two way radio. on April 8,2023.
    There are a lot of friends for their own use of the two way radio this topic is very interested. Some people will ask, said that their children bought as a toy when the two way radio also need a license? Of course, if the use of public two way radios, use of public frequency, transmission power is less than or equal to 0.5 watts, is not required to operate the certificate and license, this can be assured. But in the case of amateur spectrum, regardless of the power of the transmission, the equipment needs to be licensed, and the operator needs to obtain a certificate of competency, just like a driving licence and a license for a vehicle. Today, let's talk about the purchase of two way radio, see what kind of two way radio you are suitable for. First of all, handheld two way radios on the market are mainly divided into analogue radios, digital radios (compatible with analog mode), network radios and so on. Some of these two way radios are compatible with each other, or they are combined into one. This SenhaiX 8800 has been launched for two or three years, this machine at that time, the cost performance is very high, support UV dual transceiver, but also support aviation frequency reception, as well as one button frequency (decoding each other's radio transmission frequency and CTCSS), the function is very comprehensive at that time, and the cost performance is good. The SenhaiX 8800 comes in orange, black, green and red. At the same time, it has a TFT color LCD screen and support English menu, channel name display, even novice is very convenient. In addition, this type of two way radio also supports USB charging function, the machine is equipped with 2000mAh or 3200mAh (optional) battery, it is easy to go out to charge the two way radio, plug in a data cable can be done, unlike many traditional two way radio also use a large charging base, it is cumbersome. The 8800 is a pure analog radio, which supports both UHF and VHF. The peak transmitting power is 5 watts. The integrated circuit has obvious cost advantage, higher cost performance, stable transmission and high receiving sensitivity. The bottom is also equipped with red, blue and white LED lights, with a variety of lighting, flashing modes. It can play the role of lighting or help at night or outdoor environment, very practical, is also a survival tool in the field. Overall, SenhaiX 8800 is well suited to the average amateur radio operator.
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  • How do two way radios play a role in road trip activities?
    How do two way radios play a role in road trip activities? on April 6,2023.
    As the weather gets warmer, outdoor activities become more and more popular. If you want to travel light, you must give up some heavy equipment and tools, but there is one thing you must not lose, that is the two way radio. The SenhaiX 81-(30)PLUS is a great two way radio for travel. It is dustproof and waterproof, making it ideal for outdoor activities. Take the most common road trip, for example, the two way radio can help the car behind to know the road conditions ahead, and help the car in front of the rear team, to ensure the overall pace and safety. So what should we pay attention to when using two way radios? How to effectively play the role of the two way radio? ● Basic operation of the two way radio: 1. Put on the battery and confirm the lock of the two way radio 2. Check the antenna and confirm that the contact is good 3, Power on 4. Setting or checking frequency (channel), this machine and other two way radios should be on one frequency (channel) 5. Press the PTT key, try to connect with the two way radio in the same channel, adjust the volume at the same time, and confirm the normal transmission and reception can be put into use. ● Precautions for the use of two way radio: 1. When the two way radio is in a call state, keep the two way radio at a vertical position and keep the MIC (microphone) from 3-4 cm at the mouth. When the two way radio is launched, at least 2.5 cm from the head or body. 2. In the process of use, do not randomly turn on and off for many times, do not randomly move the channel selector, do not randomly press the PTT switch, at any time to pay attention to the volume can be accurately heard signal range, put the frequency in the specified frequency, found that the power is insufficient to charge in time. 3. The two way radio should be handled lightly, avoid portable antenna to move the two way radio, do not arbitrarily remove the antenna, battery, talk to leave the computer, charger. 4. If an abnormal odor and smoke occur in the two way radio, the power should be turned off immediately and the battery should be taken out. It should be reported to the supervisor to repair or replace it in time, so as not to affect the normal work. 5. When using the two way radio, you should speak a standard polite language. It is strictly forbidden to use the two way radio or have nothing to do with work. 6. When using two way radio, the language should be concise, not complicated, simply do not drag, the organization should be clear, the tone of speech should be soft and peaceful, and the tone of impatience and boredom should not appear. 7. Generally outdoor activities, more than a dozen people with 2-3 two way radios are enough. One for captain, one for explorer, one for defender, more messy. 8. There are generally 10-20 channels in the two way radio. As long as you are on the same channel, you can talk to each other, no matter how many stations. If a channel is unclear or disturbing, you can discuss it to other channels. Do not di...
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  • Is the power of the two way radio, the higher the better?
    Is the power of the two way radio, the higher the better? on 2023-04-04
    Do you know? The radiation value of the 10W wireless two way radio(GT-10) is 20 times that of the mobile phone. However, there are many online and offline shops such high -power two way radio. They still sell 8W, 10W, 12W, and 15W to customers, and the sales volume is good. If you just buy this kind of walkie -talkie, please read it carefully. The harm of using radiation exceeding the standard two way radio. The radiation value of the 10W two way radio is 20 times that of the mobile phone. The radiation of the mobile phone is still within the normal radiation range. But when the radiation of the phone increases by 20 times, do you dare to use it every day? The rest can be done in the same manner, the radiation of 12W and 15W will be higher. The long -term use of radiation over -the -standard two way radio allows the body to be exposed to high -radiation for a long time, and the healthy body will deteriorate. Many facts prove that radiation can cause pituitary dysfunction and many other nerve stimulation. These changes eventually affect the entire body and cause a series of symptoms. How to buy regular brand walkie -talkie? 1. State regulations, the maximum value of wireless handheld two way radio is not allowed to exceed 5 watts. Remember this, regular two way radio manufacturers cannot produce more than 5W two way radio. 2. Check the code on the approval certificate of the intercom correctly. The approval code of the two way radio is issued by the Ministry of Industry and Information Technology. Only radio stations that meet the national standards will be available. The approved code when leaving the factory will be hit on the backplane of the machine. Radio with approved code can pass the non -committee's inspection aircraft. The dealers and agents of the European standards correspond to the approval certificate of the two way radio. The approval certificate of different models has the only approval code that can be queried online.
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  • Step into the magical world of radio
    Step into the magical world of radio on 2023-02-14
    On February 13, 2023, the world ushered in the twelfth "World Radio Day". When it comes to radio, many people will feel mysterious and unfamiliar, but human life is increasingly inseparable from radio. From radio, television to military radar, from vehicle wireless communication, satellite communication to cellular mobile communication, new radio technologies are constantly emerging ... more and more radio applications are quietly changing our lives. Radio technology is also playing an increasingly important role in radio and television, communications, railways, transportation, aviation, aerospace, meteorology, fishery, scientific research, emergency rescue, news media, public security, armed police, military and other departments and industries. Role, let us walk into the magical wireless world together today! 1. What is radio? The earth we live in is surrounded by electromagnetic waves, and the ubiquitous electromagnetic waves spread from small centers to all directions like water ripples. Radio waves refer to electromagnetic waves with a frequency below 3000 GHz, and use the propagation of radio waves in space to realize information. The technology of interactive transmission is called radio because it gets rid of the shackles of wires. 2. Radio Spectrum Resources The so-called radio spectrum refers to the pedigree formed by the arrangement of various radio waves according to the frequency. The development of any radio service needs radio spectrum resources as a carrier. Although radio spectrum resources are invisible and intangible, like natural resources such as land, minerals, forests, and water resources, they are important and scarce strategic resources owned by the country, and contain huge economic, social, and military values. Over the years, the workers of my country's radio management agencies at all levels have been aggressive, pioneering and innovative, scientifically managing radio frequencies, effectively maintaining the order of air waves, and ensuring the smooth development and operation of rich and colorful radio services. 3. New Radio Technologies, New Applications New radio technologies and applications are constantly emerging: mobile communications are rapidly updated, and 5G is gradually deployed; radio broadcasting services are moving towards broadband, digitization, and networking; the integration of radio and the Internet has opened up a vast new world, such as mobile Internet, Internet of Things, smart Radio technology and application innovations such as cities, Internet of Vehicles, mobile payment, wireless charging, and smart wearable devices are incubating a large number of strategic emerging industries, and huge economic and social values are emerging.
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  • How to pair the channel on the two way radio?
    How to pair the channel on the two way radio? on 2023-01-09
    Many users do not know how to "pair" channels when using two way radios. This article combines the types of two way radios to talk about their related knowledge.   The answer is "turn the FM knob". Strictly speaking, there is no so-called "pairing" for two way radios. The frequency used for calls on two way radios, whether it is analog signals in the early years or digital signals later, as well as the current base station and IP intercom technology, although the technology has changed , but the frequency used remains unchanged. As long as one or more two way radios are set to the same frequency, then the two way radios under this frequency can directly make calls, and the calls are one-to-one or one-to-many. "Pairing" said, just turn the adjustment button, you can tune the frequency.   What is a two way radio frequency?   The so-called "frequency" can be understood as TV channels and call channels. Based on different application industries, the frequency of two way radio is strictly limited. For example, the frequency of U-segment for civil use is between 400-470MHz, and the frequency of V-segment is between 136-174MHz. Take the 420MHz frequency, A radio and B radio as an example, as long as the frequencies of these two radios are all set to 420MHz, as long as the communication distance does not exceed the range, and there are no super interference sources and obstacles within the communication range, then Two two way radios can make a call, and the signal transmission during the call is limited to this frequency, which will not affect the call of equipment in other frequency bands, such as the 350MHz frequency used by public security and the 220MHz frequency used by the coast; the 433MHz frequency used by amateurs; the frequency used by mobile phones 900MHz frequency; the 85-120MHz frequency used by the radio, etc., do not interfere with each other, and do not need to be paired. As long as the device has a frequency search function, you can receive or transmit signals by adjusting the frequency, and you can also communicate.   What is the difference between the new number of two way radio communication?    The analog signal two way radios in the early years used analog signal technology, through a special sound wave oscillation device, converted it into an electromagnetic signal and emitted it, and then restored it at the receiving end to generate electronic sound; while the communication method of the digital signal two way radio is different from the analog The signal two way radio is the same, but it is no longer a signal simulation, but directly encodes the audio signal, and then decodes and restores it through the corresponding decoder. The communication distance and communication quality are much stronger than the analog signal; as for the base station communication technology, IP walkie-talkie is just a personal definition. It is essentially a digital signal communication, but it is combi...
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  • Why hasn't the walkie-talkie been replaced by the mobile phone?
    Why hasn't the walkie-talkie been replaced by the mobile phone? on 2023-01-07
    1. The walkie-talkie is not restricted by the network. In places where the network does not cover, the walkie-talkie allows users to communicate easily.    2. The walkie-talkie provides one-to-one and one-to-many communication methods, one-click to talk, simple operation, and freer communication, especially in the case of emergency dispatch and collective work, these features are very important.   3. Call costs are low. For mobile phones, communication is more based on SIM cards, and each time you need to dial a number, or call through a Whatsapp ID to make a call! He has strict signal and network requirements, otherwise the call cannot be realized!   In the case of calls on fixed occasions, sometimes faster and more stable communication is required, which will not be restricted by the operator's network! Then the importance of the walkie-talkie is self-evident! For example, in construction, it is generally communicated with tower crane drivers, high-rise buildings and underground floors. The walkie-talkie is a very good way to transmit information. You only need to press and hold to talk! In some coal mines, some people went down the mine, and the commander above also talked through the walkie-talkie!   In some live broadcasts,the director communicates with the host and actors through walkie-talkies, but sometimes it is a one-way communication, and sometimes it is a dialogue form of communication!   For many special operations such as public security and police, it is also through the walkie-talkie! In some scenarios, it is necessary to communicate without a network signal, and the people who use the walkie-talkie are relatively fixed, and there will not be too many changes, so the walkie-talkie is more convenient. It can also establish a connection for communication faster! This is not available on mobile phones!   Then maybe some mobile phone manufacturers can consider adding a walkie-talkie function to the mobile phone, but this does not mean that the mobile phone can still replace the walkie-talkie!   Because there are walkie-talkies that need to be held, and there are also those that are connected to a headset and are portable! The mobile phone is not portable in some scenarios, especially when the hands are occupied and you need to make a call. Perhaps many manufacturers of Bluetooth headsets can consider creating Bluetooth headsets with walkie-talkie functions for special operations!   But having said that, walkie-talkies are required in professional scenarios. Many enterprises and institutions have frequent communication needs in fixed places, such as issuing instructions, such as reporting the situation in a timely manner, for example, in special scenarios, the network signal is relatively weak, such as communication needs. Especially timely, without a few seconds of delay. Then the walkie-talkie is definitely the best choice.   For example, the observers of the ...
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