Digital Mobile Radio
  • How to choose two way radio between UHF and VHF?
    How to choose two way radio between UHF and VHF? on June 9,2023.
        The communication distance of the two way radio is related to the environment of use. The electromagnetic wave length of the UHF or VHF section machine is not the same, the loss of transmission is not the same, there are more buildings in the town, and the use of two way radio of UHF is relatively better in this environment; If the environment is relatively empty, such as the sea, the wilderness, etc., the two way radio ofVHF is relatively good. What is the difference between UHF snd VHF?     UHF and VHF of the radio, and the frequency range of the UHF is usually 400-470MHz; The frequency range of the VHF is usually 136-174 MHZ.     2, in the atmospheric environment or occasion of potential explosion, you must turn off the two way radio.     Because in a potentially explosive atmospheric environment, electrical sparks can cause the two way radio to explode or fire.     3. Do not replace and remove batteries or charge two way radios in potentially explosive atmospheric environments     Because when installing and removing the battery or charging the two way radio, it may cause contact sparks and cause an explosion.
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  • How to use the two way radio correctly?
    How to use the two way radio correctly? on June 7,2023.
    (1) matching. First in the use of two way radio, by long press the PTT key on the side of the radio boot, and then  set  radio you need  to use into the same number, when the frequency  at the same chennel two walkie-talkies can be used. In the case of not shutting down, with any two way radio transmission signal, can be heard in another radio, thus achieving the first step of the call; (2)  single call. When using the  two way radio to talk to each other, you need to hold down the call button on the two way radio to achieve the call. After the message is delivered, you can release the button and wait for the other person to answer. At this time, if the other party answers, we will hear the other party's reply from the two way radio.  In addition, pay attention to adjust the volume during the call to ensure that the conversation is clear and accurate; (3) group call. Two way radios not only can two people talk to each other, but also can achieve group call. The use of group call is also the same as the use of two people. First of all, the two way radio will be turned on, and then the frequency of each two way radio involved will be adjusted to the same.
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  • What is CTCSS?
    What is CTCSS? on June 5,2023.
        CTCSS is generally divided into CTCSS and DCS. So what is CTCSS? In radio communication, CTCSS is used to reduce the interference of oneself to receive calls from other customers.     What is CTCSS? The full name of analog subtone CTCSS is Continuous Tone-Coded Squelch System, a technique for attached frequencies below the audio frequency (67Hz-257Hz) that are transmitted together in an audio signal. When CTCSS is enabled, the station will attach the CTCSS signal to the normal audio signal and transmit it together. The frequency of the CTCSS is not recognized by the human ear, but the repeater can recognize it. This allows the repeater to accept only the audio signal with a CTCSS signal and not the signal without a CTCSS, thus preventing interference. In addition to the fact that the transmitting subtone of the two way radio must be the same as the receiving CTCSS of the trunk when connecting to the trunk, the subtone has other functions. In fact, when it comes to relaying, it may not be easy for beginners to understand, but let's go straight to direct mode here. In direct mode, two interphones are directly connected without trunks. At the same time, CTCSS (DCS) has the function of selecting calls, using continuous single audio encoding (digital encoding) to select calls, and always simultaneously with the transmission of voice signals is the most effective way to select calls. As long as the main call press PTT, it can make a group call or a all call. When the intercom call is over, there is no need to press a button to hang up. It is much simpler, more convenient and faster than DTMF.      CTCSS in repeater stations Subaudio is commonly used in relay communication and subaudio packet communication. As the main equipment of long-distance communication - base station, its receiving frequency is easily subject to some interference, such as harmonic interference, illegal users outside the network interference and so on. In order to ensure the normal operation of radio communication, it is necessary to set a threshold for the receiving frequency of the base station to intercept useless signals, such as the above mentioned subaudio threshold.  What is   DCS? CTCSS is an analog system.A supplier developed what became the digital coded squelch (DCS) system, also known as the digital Private Line (DPL). The generic name is CDCSS (Continuous Numerically coded Squelch System). CTCSS and DCS are also known by other names, including CDCSS, P, and DPL, but the formal terms are CTCSS and DCS. They both have the same function and work in a similar way.     Despite the CTCSS, it can actually be heard, especially if the subtone is set at the high limit (around 250Hz), or if the low frequency response of the receiver is better. Therefore, when we set the CTCSS, we try to set it as low as possible to avoid unnecessary interference. Another subtone is DCS(Digital Coded Squelch), which is a CDCSS. It ha...
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  • The three main applicable groups of two way radio
    The three main applicable groups of two way radio on June 3,2023.
        Two way radios have been invented for nearly a century. According to the order of debut, two way radio is almost half a century earlier than mobile phone, but when it comes to the changes of two way radio in this century, I am afraid it is not obvious, apart from calling function, and today's mobile phone, but almost omnipotent, taking photos, listening to music, playing games and watching movies, even master the function of two way radio to some extent. So the question is, who uses two way radios now that cell phones are so good? The following informations for you to introduce in detail:   1. outdoor lovers: travelers and car lovers       They say there are three treasures in the outdoors: a tent, a compass and a two way radio. It is a testament to the popularity of two way radios in outdoor circles that more and more travelers choose to equip themselves with a two way radio, especially for those who wants to travel alone, who would rather not carry a mobile phone than carry a two way radio.      And the car friends are even crazier, handheld radio, mobile radio, all available, the team of advance and response, at any time to report the position, to ensure that never left behind. Maybe some peoples will have some questions, mobile phones can also contact each other ah, why to take two way radio without mobile phone? Cell phones and two way radios work differently. Cell phones rely on a network of base stations to function. In areas where the signal is erratic, the phone will be your dumb teammate, ready to strike and turn into a brick. In contrast, the two way radio as long as ensure sufficient power is basically worry-free, is not more reliable.   2.employees engaged in production and service       The big difference between a two way radio and a mobile phone is that a mobile phone is a tool of life, while a two way radio is a tool of production. Most commercial or government users buy a push-to-talk system and use it as a tool of production, just as they buy computers, vehicles and uniforms for their employees. Especially in factories, construction sites, sea transportation and other frequently need to conduct scheduling, communication in the work scene, two way radio is essential. 3. military, police and public security personnel       Two way radios were born in the era of war, so it is inevitable that they were first put into the battlefield use, and in the war many remarkable achievements of the two way radios are not few, so that friendly forces to make early preparedness or targeted strikes .        Until now, two way radios have remained standard in the military and are required to be military-grade compared to other two way radios. And in the real life scene, the security of the building, the police patrol, seems to be inseparable from the two way radio.
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  • What is a two way radio?
    What is a two way radio? on June 2,2023.
        Two way radio is a wireless motor consisting of a transmitter and a receiver. Like a mobile phone, it can talk to distant objects through it. Because the complex terminal of the same channel can receive signals at the same time, it is widely used in the construction site where one-to-many communication is needed. Maybe some people think that since they are talking on the phone, they can use the mobile phone; But there are other advantages, such as instantaneous operation without the need to enter a phone number, which simplifies the communication process and improves efficiency.      In addition, except for some models, two way radios can also communicate outside the cell phone's service area. It can be used even in desolate mountains, where radio waves cannot reach, or in areas where lines are congested during disasters, and it is not necessary to pay for mobile phones because it does not use telephone lines. The key points of two way radio purchase will first explain one by one the key points of two way radio purchase. The types of two way radios can be divided into several types. The communication distance and license requirements vary. You are advised to make a preliminary selection based on the purpose of use. Low power type: License free, suitable for general simple use     Amateur low power two way radios have an effective radiated power of less than 1W. They can be used without a license and are usually relatively affordable and easy to use. However, its communication distance is short, up to 500 meters, and when it is used in the house, it may cause unstable communication through the wall, so it is only recommended for simple situations such as ordinary activities. Amateur model: can be used in large-scale activities     The transmitting power of this kind of two way radio is about 5W at most, and the distance can reach about 5km, which is much more than the low-power radio mentioned above. It can be used in a wide range of stable communication, so it is very convenient to use both indoors and outdoors. On the other hand, such products usually have larger body sizes and consume power faster, and they also require a license to use.      Network radio: Just like a mobile phone, it is not limited by distance If you don't want to be limited by the distance of communication, the network radio may be a good choice, as long as the phone service area, anywhere.      Moreover, the machines, which use lines from various telecoms companies, are generally cheap, have relatively long battery life, and are light and do not require a license, making them easy for anyone to use. However, when the phone is outside the service area, it cannot be used due to lack of signal. If the line is clogged due to disasters, it will be affected as well as mobile phones. And like 3G radios, when the company stopped the service will also be unable to use, compared with the other two types, d...
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  • Benefits of two way radio
    Benefits of two way radio on May 31,2023.
    Two-way radios have several benefits in various settings, including (to cite Senhaix 8800 as example):   Instant communication: Two-way radios allow for immediate communication between individuals or groups without the need for dialing phone numbers or waiting for calls to connect. This makes it perfect for emergency situations where every second counts.   Cost-effectiveness: Two-way radios are typically more cost-effective than cell phones, landlines, and other communication devices, making them a preferred choice in businesses such as construction, security, and hospitality.   Durability: Two-way radios are built to withstand harsh weather conditions, water, and impact making them a reliable communication tool in outdoor environments.   Enhanced safety: Two-way radios can be used to alert team members of potential hazards and emergencies in real-time, allowing for coordinated responses that can reduce risks and increase safety.   Privacy: Two-way radio conversations are private and cannot be monitored by third parties, making it an ideal solution for businesses or organizations that require confidential communications.   Improved productivity: Two-way radios enable quick and easy coordination among teams, which can significantly improve efficiency and productivity in industries such as logistics, transportation, and manufacturing.
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  • How to choose mobile radio?
    How to choose mobile radio? on May 29,2023.
        Two way radio can be divided into handheld, mobile radio, base station and short wave station, at the same time, two way radio should be used very carefully, many of them are also involved in national security laws and regulations, some distraction can cause illegal events.  Some peple might have some doubts, because it just a radio.     Several functions of two way radio can not be replaced by telephone. First, it does not require a network base station, can still be used in the middle of nowhere, immediacy and free of charge. Secondly, two way radios can be one-to-many, similar to group conversation, telephones seem to be more one-to-one at present. Mobile radio     The station needs to be installed in the car, directly from the car battery power, so it is best to use the radio to keep the vehicle in a state of fire, otherwise desolate, battery will lost power.     The power of the mobile radio can be maintained at about 25-50W. With high-frequency antenna, the communication distance can usually be about 30km. This is no match for the handheld, which also needs to buy batteries. So what are the factors that affect the signal?     Usually in accordance with the height > position > power, signal influence is the biggest height, higher signal farther, no height you need to find a good position without interference, no good position, can only dry split high power. The necessity of buying a mobille radio.     If you're traveling in a convoy or need to keep in touch, you don't want to spend too much on phone calls or rely on a cell signal. In this case you can use the mobile radio or walkie-talkie. He doesn't need an Internet signal. In the middle of the desert, he can use electricity.     How far can a mobile radio receive range depends on buildings or trees. If it is in an urban area, the receiving range can be 7~20 kilometers. In a suburban or rural area , it can reach 10-30 kilometers. If you're in the open Gobi or the desert. Can reach about 50 kilometers. In addition, the receiving distance can be improved by connecting to the local non-committee relay station or installing a small relay station in the car. In this way, the receiving distance can be more than doubled.      In addition, the height of my location will greatly affect the signal reception. The higher the geographical location, the less interference, the easier the signal will be received. It is also commonly used in civil aviation, transportation, water conservancy, railway, manufacturing, construction services and other industries, such as long-distance scheduling in factories, as well as wireless calls on giant cargo ships, to improve the efficiency of communication and improve the rapid response ability to deal with emergencies. How to install it? You can also install it without going to the 4s shop.Only need to find the instrument panel for fixed host. Then lead the line to the a...
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  • What is CTCSS of a walkie talkie What is its purpose
    What is CTCSS of a walkie talkie What is its purpose on May 27,2023.
        If you are a fan of radios or walkie talkies, you may have heard of CTCSS or Continuous Tone-Coded Squelch System. But what exactly is CTCSS, and what is its purpose?     CTCSS is a technology used in two-way radios, including walkie talkies, to ensure private communication. It is a technique that filters out unwanted signals and allows only a specific transmission to be heard within a group. CTCSS works by assigning a unique sub-audible tone to each group of users, making it possible for them to communicate privately without being disturbed by other radio signals in the area.     The CTCSS tones range from 67Hz to 254.1Hz. Each radio station has a specific tone, and any radio receivers using this tone will receive the transmission. It means that only users with matching codes can communicate, allowing a private conversation. It is a crucial technology in industries like security, transportation, and emergency services, where clear communication is vital.     The primary purpose of CTCSS is to prevent cross-talk. Cross-talk is the phenomenon where one radio broadcast interrupts another radio station's communication. A CTCSS code stops this by blocking any transmission that does not match the assigned code. The receiver only opens when receiving a transmission with the matching tone, ensuring that each group can communicate without interference.     CTCSS can also improve the clarity of the transmission. Without the use of CTCSS, a user may hear background noise and static, making it difficult to understand the message. However, using CTCSS reduces the background noise, providing a clearer and more reliable transmission.     Another advantage of CTCSS is that it is very user-friendly. It is easy to set up and can be used by anyone, even those who are not tech-savvy. You only need to ensure that your walkie talkie has CTCSS capabilities and to match your radio station with the correct tone. There are preset codes available on most walkie talkies, making it easy to find the appropriate tone for your group.     In conclusion, CTCSS is an essential technology in two-way radios that helps ensure private communication. It is a crucial technology for industries like security, transportation, and emergency services, where clear communication is vital. Using CTCSS can prevent cross-talk, improve the clarity of the transmission, and is easy to use. Whether you are going camping, working outdoors, or part of an emergency response team, CTCSS can help ensure reliable communication.
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  • UHF vs VHF: How Are They Different?
    UHF vs VHF: How Are They Different? on May 25,2023.
        UHF and VHF, two popular frequency bands used in communication systems, are quite different from each other in several aspects. These frequency bands are used for various purposes like television broadcasting, radio communication, and public safety communications. But what distinguishes UHF from VHF, and why is it important to understand their differences? Let us dive into the details to understand their dissimilarities. And Senhaix can provide all sorts of two way radios. Frequency Range     One of the key differences between UHF and VHF is their frequency range. VHF frequency ranges from 30 MHz to 300 MHz while UHF frequency ranges from 300 MHz to 3 GHz. This means that UHF has a higher frequency range than VHF. Due to its higher frequency, UHF is used for shorter range communication, while VHF is used for long-range communication. For example, VHF is commonly used in radio broadcasting, while UHF is used for wireless microphone systems. Wavelength     Frequency and wavelength are inversely proportional to each other. So, a higher frequency has a shorter wavelength. Thus, UHF has a shorter wavelength than VHF. Due to its shorter wavelength, UHF has a stronger and more focused signal, making it suitable for line-of-sight communication. On the other hand, VHF has a longer wavelength, which allows it to penetrate obstacles better. This makes it ideal for long-distance communication. Propagation     Propagation is a term used to describe how a signal travels in a particular frequency band. UHF signals are generally line-of-sight and do not pass through obstructions well, which means that they cannot travel through walls or other obstacles. This also makes UHF ideal for communication in crowded areas like cities. VHF signals, on the other hand, have a longer wavelength that can easily pass through various obstacles and can even travel over the horizon. This makes them apt for long-range communication in rural areas. Applications     Both UHF and VHF have unique applications. VHF is commonly used for radio broadcasting, amateur radio, and military communication. It is also used by emergency services, including police and firefighters. UHF, on the other hand, is used for wireless communication systems, such as cell phone towers, and for broadcast television systems, such as satellite TV.     In conclusion, UHF and VHF are different in their frequency range, wavelength, propagation, and applications. While both have advantages and disadvantages, they are both essential to different types of communication systems. Understanding these differences can help in making informed decisions while selecting a communication system that suits a specific need. So, it all comes down to the specific use case and application requirement.
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  • Two Way Radios vs. Cell phones 13 Benefits of Two Way Radios for Your Business
    Two Way Radios vs. Cell phones 13 Benefits of Two Way Radios for Your Business on May 23,2023.
        In today's world of instant communication, businesses need to stay connected to their teams to stay competitive. Two-way radios and cell phones are both essential tools that can keep you connected with your team members, but they have different benefits and limitations.     While cell phones are useful in many situations, they are not always the best option for businesses that need instant, reliable communication. Two-way radios, on the other hand, offer numerous benefits that make them an attractive choice for many businesses. Below are 13 benefits that two-way radios offer over cell phones: 1. Clear Communication: Two-way radios provide clear, high-quality sound that isn't affected by the location or building interference. 2. Cost-effective: There are no recurring monthly fees or contracts to buy two-way radios, making them a cost-effective solution for businesses. 3. Durability: Two-way radios are designed to withstand harsh conditions and are more durable than cell phones. 4. Hands-free: Many two-way radios are equipped with Bluetooth, which allows you to communicate hands-free, improving worker safety. 5. Long battery life: Two-way radios have longer battery life than most cell phones, meaning less downtime for charging. 6. No network dependence: Two-way radios operate independently, making them ideal for remote work and locations where cellular service may not be available. 7. One-to-many communication: Two-way radios can transmit to multiple people simultaneously, making it easier to communicate with your team members. 8. Push-to-talk: The push-to-talk feature eliminates missed calls and makes instant communication possible, without having to wait for someone to answer the phone. 9. Quicker response: Two-way radios allow for faster response times, resulting in fewer delays and better decision-making. 10. Reliable: Two-way radios are incredibly reliable and work in almost any situation, from inclement weather to crowded areas. 11. Security: Two-way radios offer an additional layer of security, as they are not subject to hacking, cyber-attacks, or interception. 12. Simple to use: Two-way radios are easy to use and require little training, meaning your team can start using them quickly. 13. Work-specific features: Two-way radios are designed with specific industries in mind and come with unique features that cater to each industry's needs.     Overall, two-way radios offer excellent benefits that make them a valuable tool in many environments. If you're looking to improve communication between your team members, two-way radios may offer the solution you need.
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