Digital Mobile Radio
  • What is Waterproof radio
    What is Waterproof radio on July 25,2023.
        Waterproof two-way radios are specifically designed to withstand exposure to water, making them an essential communication tool in environments where moisture, rain, or water-based activities are prevalent. These rugged devices provide reliable and uninterrupted communication even in wet and challenging conditions.     The key feature of waterproof two-way radios lies in their robust construction. They are engineered with durable materials and sealed enclosures that offer protection against water intrusion. The level of water resistance is usually specified by an IP (Ingress Protection) rating, indicating the device's resistance to water and solid particles.     The waterproofing measures implemented in these radios include tight seals, reinforced casings, and gaskets that prevent water from entering and damaging the internal components. The buttons, ports, and connectors are also designed to be water-resistant, ensuring that no moisture seeps into critical areas of the device. With these protective features, waterproof two-way radios can withstand exposure to rain, splashes, and even temporary submersion in water.     The applications of waterproof two-way radios are diverse. They are widely used by outdoor enthusiasts, hikers, campers, and other adventurers who need reliable communication in wet or unpredictable weather conditions. These radios are also indispensable for professionals working in industries such as construction, maritime operations, search and rescue, and water-based sports, where water resistance is a crucial requirement.     The benefits of waterproof two-way radios extend beyond their ability to withstand moisture. They typically possess the same functionality and features as their non-waterproof counterparts, including long-range communication, multiple channels, voice activation, and secure channels. This makes them a versatile and valuable tool in various scenarios where effective communication is essential.     Moreover, waterproof two-way radios are often designed with user-friendly interfaces and ergonomic designs that enable easy operation even in wet conditions. They may have larger buttons or textured grips that allow for better handling, even with gloved hands or wet fingers. Some models also feature additional elements like built-in flashlights or emergency alert functions, adding to their usefulness in critical situations.     It is important to note that while these radios are labeled as waterproof, their level of water resistance may vary depending on the IP rating specified by the manufacturer. It is crucial to understand the specific capabilities and limitations of a particular model and ensure that it aligns with the intended application and environment. And SenHaiX 81-(30) PLUS is a professional waterproof radio with IP67.     In summary, waterproof two-way radios are valuable tools that combine the reliability of communicati...
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  • How Does a Walkie-Talkie Work?
    How Does a Walkie-Talkie Work? on July 21,2023.
        Walkie-talkies, also known as two-way radios, are fascinating devices that have revolutionized communication in various fields, from public safety to outdoor adventures. Understanding how they work not only satisfies curiosity but also sheds light on their practical applications.       At their core, walkie-talkies are radio transceivers that allow users to transmit and receive voice signals over short distances. They operate on specific radio frequencies within the electromagnetic spectrum, typically under the umbrella of the Family Radio Service (FRS) or General Mobile Radio Service (GMRS) bands. These frequencies are allocated by regulatory bodies to ensure efficient and interference-free communication.       The functioning of a walkie-talkie can be simplified into three main components: a microphone, a transmitter, and a receiver. When a user speaks into the microphone, the sound waves are converted into electrical signals through a process called modulation. Through modulation, the audio information gets combined with a radio frequency carrier wave.       The transmitter then takes these modulated signals and amplifies them to a sufficient power level for transmission. It converts the electrical signals into radio waves and emits them through an antenna. The antenna radiates the waves into the surrounding space, forming an electromagnetic field that carries the encoded audio information.       On the receiving end, another walkie-talkie or radio device within range picks up these transmitted radio waves through its antenna. The receiver within the device then captures the waves and converts them back into electrical signals. It separates the audio information from the carrier wave through a process called demodulation. The demodulated signals are then amplified and passed through a speaker or an earpiece, allowing the user to hear the received audio.       To maintain clear and uninterrupted communication, walkie-talkies employ a half-duplex communication method. This means that only one party can transmit at a time, while the other party listens. Users typically press a push-to-talk (PTT) button on the two way radio to initiate transmission and release it to switch to the receiving mode. This simple but effective mechanism ensures that conversations are well-coordinated and avoid interference.       The range of a walkie-talkie depends on several factors such as the output power of the transmitter, the sensitivity of the receiver, terrain and obstacles, and the surrounding electromagnetic environment. In open spaces with minimal obstructions, walkie-talkies can achieve ranges of several miles. However, in urban environments or areas with dense foliage, buildings, or electromagnetic interference, the effective range may be significantly reduced.       In conclusion, walkie-talkies function by modulating and transmitting aud...
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  • What kinds of two way radios are different the role and scope of use of two way radios
    What kinds of two way radios are different the role and scope of use of two way radios on July 18,2023.
    Eight types of two way radio function and scope of use 1, professional radio Professional radio refers to the transmission power of 4-5W, frequency range of 136-174MHZ or 400-480MHZ. For this kind of walkie talkie,the talk distance is between 3 to 8 kilometers (depending on the specific environment). The operation is relatively simple 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 shortcoming of the professional radio is that the volume is larger and relatively heavy, but it is more prominent in the waterproof, anti-quake, anti-fall, anti-aging, and the performance of the walkie-talkie is much more stable. The price of the professional radio is higher, and it is generally used in construction engineering, property management, and factory workshops 2, commercial radio Commercial radio refers to the transmitter power of 0.5-4W, frequency range of 400-480MH, this kind of transmitter talking distance between 800 meters to 8 kilometers (depending on the transmitter power size and the specific environment varies). Commercial radio appearance is light and beautiful, through the belt clip of the matching machine will be tied to the waist, wearing headphones can free hands to improve work efficiency. The price of commercial radio is relatively high as that of professional matching machine, which is generally used in shopping malls, supermarkets, retail, factories and manufacturing industries. 3, walkie talkie Civil walkie-talkie refers to the transmission power of 0.5W is not greater than 1W, the frequency range between 409MHz walkie-talkie, civil to the general talk distance is short, (3 kilometers in the open) is approved by the state without a license can be used wireless communication equipment. The civilian walkie ralkie is small in size, diverse in color and low in price, which is more suitable for personal business trips, tourism and restaurant use. 4, amateur radio Amateur radio designed to meet the use of amateur radio enthusiasts, the production of radio access machine. In response to this amateur radio for everyone service, each country has opened up a special frequency band allocated to amateur radio sports enthusiasts. So many countries opened up the frequency band of 144~146MHZ and 430~440MHZ, the world is generally also this frequency band, amateurs only need to buy their favorite models, apply for a local radio network permit, you can talk to others. Countries around the world generally use this frequency band. 5, explosion-proof radio In many wireless radio brands with explosion-proof walkie-talkie brands are not many, mainly used in coal mines, liquefied gas filling companies, oil depots, oil fields, petroleum, gas stations chemical, petrochemical, coal, mining, natural gas, chemical plants, flour processing plants, flax processing plants, coal processing plants, fire. 6. Railway radio There is no doubt that the railway railway rad...
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  • What is the effective range of the two way radio?
    What is the effective range of the two way radio? on July 17,2023.
    Different types of two way radios, its effective range is different. 1, handheld radio Radio of transmission power 5 W /4 W : urban 200-800 meters, urban 1-3 km, urban 500-2 km, in the open unshielded area 3-5 km. 1-3 km in an open and unsheltered area. SenHaiX N301 is a good example of this type. Radio transmission power of 1 watt /0.5 watt: 500 meters -1.5 kilometers in an open area without shelter. 2, mobile radio Mobile radio of transmission power 50W / 40W: 5-15km in urban areas, 10-25km in open areas. Mobile radio of transmission power 50W / 40W: 3-10km in urban areas, 5-15km in open areas. Mobile radio of transmission power 50W / 40W: 1-5 km in the urban area, 3-8 km in the open area. 3, short-wave radio The communication distance is very far, if the external environment allows, this radio can be national or even global communication. But the users of this type of radio need to have a professional license. 4. Two way radio used with the base station Two way radio with the base station can effectively increase the communication distance. After adding the base station, the communication distance can reach 30 kilometers.
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  • What's the point of police using two way radios
    What's the point of police using two way radios on July 13,2023.
    In an era dominated by advanced communication technologies, one may wonder why the police continue to rely on two-way radios as a pivotal tool in their day-to-day operations. In truth, these devices offer crucial benefits that make them indispensable for law enforcement agencies. From enhancing officer safety and coordination to ensuring effective communication during critical incidents, two-way radios remain an integral part of modern policing. This article explores the importance of two-way radios and their continued relevance in the ever-evolving landscape of law enforcement. Immediate and Reliable Communication: Two-way radios provide police officers with immediate and reliable communication channels, enabling real-time updates and coordination. Unlike cell phones, which require dialing and are susceptible to network congestion or signal loss, radios offer direct push-to-talk communication with fellow officers. This instantaneous mode of communication proves invaluable in dynamic situations where every second counts, ensuring officers can relay crucial information swiftly. Officer Safety and Situational Awareness: One of the primary purposes of two-way radios is to enhance officer safety. By allowing officers to stay connected to their colleagues and dispatchers at all times, radios provide a lifeline back to the police network—a vital tool in emergency situations. Officers can quickly request backup, relay suspect descriptions, share information regarding dangerous locations, or report injuries, all while keeping their hands free for other critical tasks. This ability to enhance situational awareness significantly contributes to the safety and effectiveness of law enforcement personnel. Effective Coordination and Tactical Operations: Police work often requires coordinated efforts among multiple units, whether addressing a crime scene, conducting a search operation, or responding to large-scale incidents. Two-way radios facilitate seamless coordination between officers, allowing them to strategize, synchronize movements, and effectively allocate resources. Timely and precise coordination can make a substantial difference in apprehending suspects, protecting civilians, and resolving crises swiftly and safely. Radio Encryption and Security: Two-way radios used by law enforcement agencies are equipped with encryption and security features that ensure confidential information remains protected. This level of security is particularly crucial when discussing sensitive information, operational details, or executing covert operations. By preventing unauthorized individuals from eavesdropping or intercepting sensitive communication, radios offer a level of confidentiality that cannot be guaranteed with other communication methods. Durability and Independence: Policing can take officers into various challenging environments, including extreme weather conditions, accident scenes, or natural disaster sites. Two-way radios are built to be durable, rugged,...
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  • What is CTCSS?
    What is CTCSS? on July 12,2023.
    In the walkie-talkie product introduction function information bar, you can always see CTCSS, CdcsS, DCS, DTCS, QT, DQT, PL, TPL and DPL and other English nouns,  although the names are different, But all are to mark the equipment has the function of sub-audio signaling system, but the manufacturers have different names. What kind of function can CTCSS achieve? Today, I will talk with you about the relevant knowledge of sub-audio signaling of two way radios. Types of CTCSS Subaudio signaling can be divided into two types, one is called CTCSS, the other is called DCS. The English name of subaudio signaling is Continuous Tone Controlled Squelch System. It is a coding identification signaling technology that attaches a single tone frequency (67-250.3HZ) lower than the voice frequency to the audio signal and transmits it together, because its single tone frequency is lower than the voice frequency of 300HZ. PL(Private LineCodes). PL signaling is actually CTCSS subaudio signaling, and some radios simply refers to this technology in terms of the functionality of a private security line. The English name of the Digital subaudio (Coutinus Digital Controlled Squelech System) referred to as DCS or DTCS.DQT also shows that the digital audio, and you can also call DPL (digital private line). Differences between CTCSS and DCS CTCSS and DCS function the same, the difference is that it is digitally encoded and the audio signal is transmitted together. Both CTCSS and DCS belong to international common signaling standards. The frequency range of CTCSS is 67.0HZ-250.3Hz, there are 38 standard codes, each code of 01-38 has a corresponding frequency, such as code 01 corresponding frequency is 67.0HZ. The code of PL private line is indicated in English and numbers, such as the frequency of 67HZ its English code is "XZ". Non-standard CTCSS Each manufacturer selects the audio frequency below 300HZ according to different circumstances. The purpose of two way radio using CTCSS The purpose of using sub-audio technology in the design of two way radios is to avoid the influence of different users on each other, to avoid listening to unrelated calls and interference signals. Because it can stop voice and signaling interference from other users in the common channel, it is also called ToneLock. When the transmitter of the walkie-talkie sends a voice signal at the same time, accompanied by the transmitter constantly sends out a sub-audio sustained signal, which is transmitted in the same channel after modulation. When the receiver receives the carrier signal and the CTCSS, it mediates. The subaudio signal is decoded in the input CPU through the filter shaping, and compared with the local preset CTCSS(DCS) code to determine whether to open the silencing circuit. Only when the same subaudio code is used, the audio output of the silencing circuit can be opened to emit sound through the speaker. Therefore, it can suppress unwanted voice and other signaling effects from other ...
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  • What is the important role of outdoor radios
    What is the important role of outdoor radios on July 10,2023.
    Have you considered the role of outdoor radios? It can be summarized as follows: 1. Two way radios are not used for entertainment in outdoor activities, and properly used, they can bring us great convenience and also guarantee your safety. For example, the organization of the team, the transmission of the situation, the contact with the base station and the external call for help in the event of an emergency. 2. The two way radios in the team should be properly equipped. This is especially important in complex situations, if there are only two walkie-talkies it is natural to have them at both ends of the line. If there are three, of course that one should be in the center of the line. This ensures that each team member can get in touch with the team through a nearby mobile station in case of a situation. The best way is everyone have one! 3. Get familiar with your two way radio and put it to good use. If you have a two way radio, you should know its performance and operating instructions. Instead of just tuning in to the same frequency as your teammates. If you encounter special situations, you can quickly switch to or use the frequency search function to get in touch with the outside world in time. This is very important to know when there is no cell phone signal! There is no signal at the critical time is very troublesome! 4. Wireless terminal equipment (including: two way radios, mobile radios, etc.) are portable and can be carried everywhere to communicate. 5. Make sure your two way radio has enough power. Do not use or chat for a long time, and try to use low power transmission if the distance is not far.This will save power. Remember! Always have a spare battery that you don't use as a last resort.
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  • What are the benefits of choosing a police walkie-talkie
    What are the benefits of choosing a police walkie-talkie on July 7,2023.
    The police is sacred, and the quality of the tools used by the police is also guaranteed, so it is necessary to use the police walkie-talkie for security and other work of the same nature as the police, and the police walkie-talkie with a reputation is not only recognized in quality but also the corresponding price is good. So what are the benefits of choosing police walkie-talkies for users? First, be able to contact and communicate in a timely manner at the first time Because ordinary mobile phones need to dial and then wait for a long time to be connected, and the choice of police walkie-talkie can achieve the effect of first time communication without waiting, when the use of this type of walkie-talkie in an emergency can be faster to contact the object that needs to be contacted. No more time is lost in dialing and waiting to prevent irreversible hazards during this time. Second, can connect the alarm line in case of emergencies can be timely alarm Since the walkie-talkie was originally provided to the police, there is a special alarm on the radio, the police walkie-talkie has a special channel to directly dial the alarm hotline to give the holder help, and the alarm can not be dialed back once it is pressed, so it needs to be extra careful in the process of use, to ensure that the first time in time to press the alarm and then the cycle after the emergency. Third, can have more professional mechanical equipment Since the brand of the wlkie-talkie was originally provided to the police, it is more professional, and the police walkie-talkie is originally belonging to the police, so the quality and production process do not have to worry, the general production process provided to the police is superior and there will be no quality problems, and the general use of professional mechanical equipment needs to be understood in advance against the manual. The sale of good police interphone is due to the price and quality are loved by users so the sales increase. The choice of police walkie-talkie can not only contact users on another walkie-talkie in the first time, but also connect the police to prevent  emergencies from being contacted in time, and also have more professional mechanical equipment to prevent subsequent quality problems.
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  • How do two way radio work
    How do two way radio work on July 5,2023.
    Cell phone technology has developed at an astonishing speed. But cell phones are still just very fancy radios, and they have an Achilles heel - they're completely powerless without a network of nearby cell towers. A walkie talkie? These old radios made short-range wireless communications possible in places where cell phones could not be used. A two way radio is a wireless handheld radio small enough to be carried around with you. They look a lot like cordless phones, and the body includes a microphone and speaker, as well as an antenna. Unlike a phone, though, two way radios have speakers and microphones right next to each other, and the speakers are much louder so that anyone who can hear can follow the conversation. Two way radios are battery-powered transceivers, which means they can both send and receive radio information. They have a half-duplex channel, which means that only one two way radio on a channel can send a signal at the same time, although many radios can receive the same signal. In other words, unlike cell phones, two way radios use a push-to-talk (PTT) system - you have to press a button to speak, and then you have to release the button to hear the sounds made by other devices. Both parties to a phone conversation can interrupt or join the conversation through constant voice. Since you don't need to dial every time, two way radios are fast and easy to use. Best of all, they don't rely on fussy cellphone signals. The two phones can communicate directly with each other, so they will still work during natural disasters or power outages when the cell phone network goes down. They are primarily designed for short-range communication, where groups of people are within a few miles of each other. Businesses use two way radios so employees can chat effectively in or around their indoor and outdoor buildings. Wilderness enthusiasts carry radios with them so they can stay connected when out hiking or hunting, where there is no cell phone coverage age. Even baby monitors use one-way walkie talkie technology so you know if junior is sleeping quietly or trying to escape.
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  • How to choose two way radio for outdoor activities?
    How to choose two way radio for outdoor activities? on July 4,2023.
    Professional radio refers to the transmission power of the two way radio greater than 4W, the most common professional radio on the market at present has the transmission power of 4W and 5W. The actual call distance of this kind of two way radio is generally about 7 kilometers, which mainly meets the application that requires a longer call distance, such as public security, security and large community management. The price of such radios is higher, generally around 1500 to 2000. Civil radio refers to the transmission power is not greater than 0.5W of the radio, the actual communication distance of this kind of walkie-talkie is generally about 1.5 kilometers, mainly to meet the requirements of the communication distance is not strict applications, such as restaurants, small parties, exhibitions, travel and so on. The price of such radios is low, generally between 240 and 500. There is also a class of two way radios between professional and civil radio, their transmission power is about 2W to 3W, the actual call distance is about 4 kilometers. This kind of two way radio mainly meets the users who have certain requirements for the communication distance, but the price of the radio is not too high. Because in actual use, many travel enthusiasts finally feel that the call distance of 0.5W radio is relatively close, which cannot meet the slightly distant application, if you buy a professional radio, although it can be used, it has to bear a higher cost, and it is rarely used so far. Or the best choice is a 2W radio. After having a basic understanding of the outdoor radio, it will be more convenient for everyone to buy and operate in the later period. Then about the specific purchase of outdoor two way radios need to pay attention to things, we will continue to explain in the next chapter. 1. Two way radio power supply Currently commonly used two way radio power supply are: lithium rechargeable battery, nickel metal hydride rechargeable battery, AA alkali battery. Generally can not be charged in the field, so the standby time and talking time of the two way radio is a more important parameter, otherwise it is often a problem due to the lack of power of the two way radio when it is most needed for communication. In general, lithium, nickel-metal hydride for the power of the two way radio is relatively large, but the backup battery is a big problem; The power of a two way radio powered by an alkali battery is generally less than 2W. 2. Communication frequency, Communication Frequency and radio communication are as closely related as roads and cars. There are two main sources of common radios: those brought back from abroad; Civil radios purchased by regular domestic shops. Although they are all in the UHF for communication, but because of the domestic radio band management regulations and international standards are different, the communication frequency of these two types of two way radios are also very different. Maybe now you're thinking about buying ...
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