Digital Mobile Radio
  • 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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  • Introduction of general function parameters of radio
    Introduction of general function parameters of radio on July 3,2023.
    Radios are ubiquitous devices in our modern world, powering communication across various industries and sectors. Whether used in emergency services, transportation, or everyday life, radios play a vital role in keeping us connected. To fully understand and utilize these devices, it is crucial to grasp the general function parameters that govern their operation. This article aims to introduce and explore the fundamental parameters that characterize radios, providing an overview of their essential functionalities. Frequency Range: The frequency range is a fundamental parameter that determines the operational capabilities of a radio. It refers to the range of frequencies over which the radio can transmit and receive signals. Radios operate within different frequency bands, such as UHF (Ultra High Frequency) or VHF (Very High Frequency). Each frequency band has its advantages and disadvantages, and the choice depends on factors like transmission distance, signal penetration, and interference considerations. Transmitter Power Output: The transmitter power output, typically measured in watts (W), indicates the strength of the radio signal being transmitted. Higher power output generally allows for longer transmission distances and better signal penetration through obstacles. However, it is important to adhere to regulatory requirements and ensure that the power output of radios complies with legal limits to avoid interference with other users and systems. Modulation: Modulation refers to the process of encoding information onto a radio signal. It allows for the transmission of audio, data, or other forms of information. Common modulation techniques include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). Each modulation method has its advantages and is chosen based on factors such as signal quality, bandwidth efficiency, and interference resistance. Channel Spacing and Bandwidth: Channel spacing refers to the separation between adjacent channels in a radio frequency band. It ensures that different radio transmissions do not interfere with each other. Proper channel spacing is essential for efficient spectrum utilization and effective communication. Bandwidth, on the other hand, refers to the range of frequencies occupied by a particular transmission. It determines the amount of information that can be transmitted within a given time. Squelch: Squelch is a feature that eliminates or mutes background noise when there is no ongoing transmission. It ensures that the radio only produces audio when a signal is received, improving clarity and reducing distractions. Squelch is adjustable, allowing users to set the threshold at which background noise is suppressed. Signal Encryption: Signal encryption is an important feature for ensuring secure communication by encoding transmitted information. It prevents unauthorized individuals from intercepting and understanding sensitive or confidential messages. Encryption algorithms and ke...
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  • Application of walkie-talkies in some occasions
    Application of walkie-talkies in some occasions on July 1,2023.
    Generally speaking, there are many industries that benefit from the use of walkie-talkies to make work more convenient. 1. Business radio Meetings are attended by many people, and sometimes it can be crowded because of too many people. Key attendees or VIPs or staff may need to be found when needed. In an emergency, you can also quickly contact security personnel. A large conference, with two way radio, so as to be unified and effective organization success. 2. Farm radio No matter how big the farm, the use of two way radio will greatly increase the convenience. Agricultural activities sometimes in more remote areas, the signal may not be very good. In this way, if they all use walkie-talkies, staff scattered in different places can quickly ask for help at any time or tell them where and what to do. If driving, you can also use the car radio, you can also carry out GPS positioning, more accurate to find the place. If there is an emergency such as animal injury, it can also notify rescue quickly. Many agricultural facilities are relatively large, prone to accidents, if there is no walkie-talkie, in remote places, even if the call is difficult to be known by others to rescue. More intelligent radio, in the place of signal, you can not limit the distance radio, in the place of no signal, you can also short-distance radio. 3. Hotel radio Hotels need a lot of staff to clean rooms and serve guests. Walkie-talkies can be used for all staff, including scheduling from the front desk to the guest rooms, to the deployment of security work, emergency prevention.With headphones and other accessories, it can not only keep the space quiet, but also grasp the information of the room at any time, which can make the service more perfect. 4. Construction industry radios When it comes to the construction industry, there is a sense of staff holding two way radio. The construction industry tends to have more dispersed workers and special work locations. Often need to cooperate with each other, whether it is for safe production or rapid equipment feedback, is very important. 5. Security radio Security work is generally distributed in different areas, whether separated or in the crowd, from all directions or different areas to ensure the overall work. Therefore, real-time communication and cooperation are needed. In fact, walkie-talkies are ubiquitous, economical and practical, and are an essential communication tool in our daily lives.
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  • Advantages of marine radios compared to mobile phones
    Advantages of marine radios compared to mobile phones on 2023-06-30
    Nowadays, network coverage area is getting larger and larger, mobile phones can receive signals even in the near sea.But after asking a lot of customers, it was learned that the most used communication tool on the ship was the marine radio, not the mobile phone. Mobile phones are used more as an entertainment tool, and of course as a secondary communication tool. To cite SenHaiX 5700 as example. So what exactly leads customers to make this choice?When it comes to communication at sea, mariners rely on reliable and dedicated devices to ensure safety and efficiency. While mobile phones have revolutionized communication on land, marine radios remain an essential tool for seafarers. These radios offer distinct advantages over mobile phones in maritime environments, providing reliable coverage, safety features, ease of use, and compliance with international regulations. In this article, we will explore the unique advantages of marine radios and explain why they are crucial for effective communication on the water. Dedicated Marine Frequencies and Coverage: Marine radios operate on dedicated frequency bands specifically allocated for maritime communication. The most common bands include Very High Frequency (VHF) and Single Sideband (SSB). These dedicated frequencies are monitored by coast guard stations, maritime authorities, and other vessels, ensuring reliable, interference-free communication. In contrast, mobile phones rely on terrestrial cellular networks and may have limited coverage offshore or in remote areas, leaving mariners without reliable connectivity. Safety Features and Distress Calls: Marine radios are equipped with safety features designed to enhance the overall safety of mariners. One of the most critical features is the ability to make distress calls. By using the Digital Selective Calling (DSC) feature, mariners can transmit an emergency signal with their precise position to nearby vessels and Coast Guard stations. This immediate and widespread alert can significantly expedite rescue operations during emergencies. Mobile phones, on the other hand, lack these dedicated features for maritime distress calling. Battery Life and Durability: Operating in a marine environment can be physically demanding, and equipment must be able to withstand harsh conditions. Marine radios are built to be rugged and durable, providing resistance to water, shock, and vibrations. They also have long battery life, allowing continuous communication throughout extended trips at sea. Mobile phones, while capable of handling everyday tasks, are generally not designed to withstand the rigors of the marine environment and may have limited battery life, especially when used for extended periods. Ease of Use and Simplicity: Marine radios are designed with simplicity and ease of use in mind. They feature large buttons and intuitive controls, enabling quick operation, even in challenging conditions or during emergencies. The user interface is purpose-built for marine ...
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  • What are the advantages of high-power two way radios?
    What are the advantages of high-power two way radios? on June 29,2023.
    Nowadays, with the rapid development of the communication market, all walks of life have begun to use two way radios, and different types of series two way radios are produced due to various important requirements. Such as: high quality radio, high power radio, explosion-proof radio, waterproof radio and so on. Today we mainly discuss high-power radios, for you to introduce the advantages of high-power radios: First, strong diffraction ability. If there is a special obstacle blocking the radio waves of the radios, then the radios cannot communicate with each other. The signal transmission of the two way radio uses radio waves, and when special obstacles are encountered in the transmission process of the radio waves, they will be bypassing, we call it diffraction. The stronger the diffraction, the better the communication. Like in a mountainous city, you need a two way radio with strong diffraction ability. There are more mountain city intended to choose high-power radios when purchasing. Second, the communication distance is far. The communication between two way radios, in the case of a long distance to ensure that communication is unimpeded, is of great help to the work. If you want to talk to people at the top of the mountain, but it doesn't work, it will affect your work efficiency. Third, strong penetration ability. The signal from a high-powered radio can travel through obstacles. Although high-power radios are good, but there are also places that must be noted, the current law stipulates that ordinary citizens in the purchase of two way radios (power of more than 0.5W), you must go to the local wireless communication management agency for the establishment of the station procedures, if you do not go through the procedures to directly use high-power radios are illegal use. Therefore, pay attention to whether the frequency of the two way radio meets the requirements of the country. Now some people like to travel when equipped with high-power radios, when climbing, can communicate with each other. Some of them in the purchase of high-power radios, and do not pay attention to the scope of civilian radios, and did not think to go to the relevant departments to register the station, it is easy to illegal use. It is not difficult to see the advantages of high-power radios are very obvious, in the use and purchase need to heed that do not use illegally.
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