Digital Mobile Radio
  • How do amateurs choose the right radio
    How do amateurs choose the right radio on April 20,2023.
    Two way radio is the main tool for amateur radio communication. HAM hopes to have a high-performance radio system to send out strong radio waves and receive 59+ complimentary signal reports from the other side. Different products have different properties. Today I'll take you together to comb a variety of walkie-talkie comparison: Amateur radios VS Professional radios Many new HAM envied professional radios at first, believing that professional intercoms used by the military and police had high performance and long communication distance, while amateur radios, since they were used by amateur individuals, naturally had poor performance. In fact, the professional and amateur in the two way radio does not mean the professional degree of manufacturing technology but the user group is different, amateur radio is not a toy. Different user groups have different application characteristics and needs. The same function may be essential for one type of users and cumbersome for another. For example, amateur radios generally provide the function of direct input of the frequency keyboard. For HAM, this is a very necessary and convenient function. You can directly input the frequency just like making a phone call. Professional users use a handful of fixed frequency points, and the call is also in the inner circle, the preset channel can completely do not need to enter the frequency temporarily, the keyboard to change the frequency function may also cause misoperation to change the current communication frequency, resulting in the failure of communication. Many industry users who use professional radios don't even have a concept of frequency. Two way radios are just a communication tool like mobile phones. Setting the frequency was a pleasure for HAM, a hobbyist, but for business users it was a tedious technical task that required a professional to do, so most professional radios were designed to be computer programming dummies as easy to use as possible, but also easy to manage. In terms of function, amateur radios are definitely more powerful than professional radios. Amateur radios generally have functions such as frequency display, manual panel frequency adjustment, frequency scanning, received signal strength display, multi-gear output power switching, etc., which are lacking in professional walkie-talkies, not to mention advanced functions of amateur models such as dual-band operation, broadband expansion reception, dual-receive channel waiting, etc. Some brand enthusiasts say that some foreign new high-end professional radios can increase panel frequency setting function FPP. There is still a big difference between FPP and amateur radio's VFO mode, which freely uses the frequency. FPP is just equivalent to providing manual channel programming without computer programming. Moreover, even professional radios with FPP function still cannot carry out continuous frequency scanning. The scanning function of professional machines is limited to preprogrammed fix...
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  • Advanced techniques for using two way radios
    Advanced techniques for using two way radios on April 18,2023.
    Today, I will mainly talk about some advanced skills and precautions for the use of two way radio, as well as the introduction of key knowledge points such as the skills and steps of the two way radio function setting. Advanced techniques for using two way radios 1, receive/send different frequencies: Receiving and transmitting can be at the same or different frequencies. In general, receiving/transmitting at different frequencies has higher communication quality than receiving/transmitting at the same frequency. Setting method: First, switch the operation mode of the intercom to the frequency mode, and first program frequency; Then use the "function key + number key" to call up the setting function of receiving/sending different frequencies, generally there are two or three options: +, -, same frequency. "+", the transmitting frequency is higher than the receiving frequency based on the current receiving frequency; The so-called "-" means that the transmitting frequency is lower than the receiving frequency. Select "+" or "-" according to whether the transmitting frequency is higher or lower than the receiving frequency. Then adjust the function of frequency setting by "function key + digital key", and set this value as the difference between the required receiving and transmitting frequencies (e.g. The receiving frequency is 145.35, and the transmitting frequency is 144.35. The transmitting frequency is 1M lower than the receiving frequency, so it should be set as "-" and the difference frequency value should be 1M). Then, the above data is stored according to the channel storage method, that is to realize the receiving/sending of different frequencies. Some machines have two storage keys for the receiving frequency and the transmitting frequency. At this time, first switch to the frequency mode, input the receiving frequency and store with the receiving storage key, and then input the transmitting frequency and store with the transmitting storage key. 2.CTCSS: In the field of walkie-talkies whic used by our normal people, simple communication encryption can be achieved by the following methods: (1) Analog encryption: In the normal transmission of the signal attached to another human ear can not hear the audio signal, said the audio signal isCTCSS, sending and receiver set CTCSS frequency should be the same. When the sender attached a CTCSS, only after receiving the same signal, the receiver can open the front stage of the noise circuit, so that the signal is transmitted to the backward stage circuit, demodulation of the normal audio signal, the user can hear the normal audio; Otherwise, if the receiver does not set the CTCSS or does not match the frequency of the sender's CTCSS, it can not open the noise circuit, of course, it can not hear the normal audio signal. Setting method: First set the communication frequency; Then press the "function key + digital key" to call out the CTCSS setting operation; Then adjust the CTCSS as needed; Store to ...
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  • The differences between  mobile phones and two way radios
    The differences between mobile phones and two way radios on April 15,2023.
    With the improvement of living standard, mobile phone has become a very important communication tool in people's life. But as a special communication tool, two way radio brings convenience to people's work and life, and is understood by more and more people. The main function of two way radios and mobile phones is voice call, but they still have many differences, mainly reflected in the following aspects. 1. Different call modes. two way radios can be used for point-to-point communication and point-to-multipoint communication. Mobile phones can only be used for point-to-point communication. 2. The different user groups. Two way radio users are mainly industrial, commercial, military, government certain systems and outdoor enthusiasts. Mobile phones are used by ordinary consumers. 3. Communication ability is different. Two way radio can not only rely on the base station to carry out ultra-long distance communication like a mobile phone, but also carry out long distance communication in a certain range apart from the base station. Mobile phones rely on base stations to communicate. 4. Different use environments. In addition to use in the daily environment, two way radios can also be used in some special environment, because the two way radios have certain anti-fall, dust-proof, waterproof functions, can also be separated from the base station in the case of long-distance communication, so that it can be used in the constructure plant, mine, outdoor, earthquake disaster areas and other environments. In order to make the mobile phone more portable design will make it smaller, it is difficult to take into account its anti-fall, dust-proof, waterproof performance, people should take certain protective measures in the process of use, such as by sticking toughened film, into the mobile phone case to protect the mobile phone is not easy to be broken. Put in a waterproof sleeve in rainy days to prevent the phone from flooding.
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  • The differences between DMR radios and normal radios
    The differences between DMR radios and normal radios on April 14,2023.
    DMR radios differ from common radios in working principle, communication mode, coverage, communication quality, and application scenarios. First of all, DMR radios use digital signal transmission technology, while ordinary radios use analog signal transmission technology. Digital signal transmission can avoid the noise and distortion in analog signal transmission, and achieve higher speech quality. In addition, digital signal transmission supports various communication modes, including point-to-point communication, group call, and broadcast, meeting communication requirements in different application scenarios. Secondly, DMR radio (GT-10D) adopts time division multiple access technology, which can realize multiple users using the same frequency at the same time, greatly improving the communication capacity. Ordinary two way  radios use analog signal transmission technology, only one user can occupy one frequency, the communication capacity is relatively small. Thirdly, DMR radio (GT-10D) has a wider coverage. Since digital signal transmission can achieve a wider coverage area with the same transmission power, DMR radios (GT-10D) can cover a wider area with the same frequency band and power. Finally, the application scenarios of DMR radios are more extensive. Because of its higher communication quality, larger communication capacity and wider coverage, DMR radio has been widely used and promoted in public safety, transportation, electric power, petrochemical and other industries. The common two way radio is more used in the field of personal consumption, such as outdoor sports, tourism, commercial use. To sum up, there are great differences between DMR radios and common radios in working principle, communication mode, coverage, communication quality and application scenarios. Because of its higher communication quality, larger communication capacity and wider coverage, DMR radio has been widely used and promoted in public safety, transportation, electric power, petrochemical and other industries.
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  • 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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