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The typical power level of the walkie-talkie is about 1 to 5W. In contrast, the mobile phone power is generally 0.6W. Therefore, in the design of intercoms, high-power, large-size amplifiers must be used, and the corresponding heat sink size is also correspondingly larger. Also, the intercom operates at ultra-high frequencies, which also leads to larger internal devices and hybrid circuits than mobile phones. In addition, due to the industrial application of the walkie-talkie, it must have a strong shell, industrial-grade seal, long battery life, and even industrial encryption to meet some special working environment, which will increase the size of the walkie-talkie.
But in the digital age, the walkie-talkie began its own change of face.
Inside and outside must be repaired
Digital intercom has many advantages, such as improving spectrum utilization, improving voice call quality, and supporting richer data applications. These features also determine that digitalization will inevitably become the future direction of walkie-talkie technology. In the era of digital intercom, the function of the walkie-talkie will be extremely rich, and many industry applications will be introduced into it. It can be said that intercom communication is not the only use of the walkie-talkie. The rich application scenarios require intercom “internal and external repairsâ€. At the same time, semiconductors, batteries, and metallurgy and other industrial technologies are also constantly evolving. This makes it possible for walkie-talkies manufacturers to design and produce products that are smaller, lighter, and more robust. product.
The change of appearance and the richness of functions make the radio have the opportunity to integrate into a broader industry information market in the digital era. In addition to intercom communication, it can also become a management terminal. Moreover, with the development of radio communication technology, people's requirements for improving the quality of wireless communication and the increasing frequency of spectrum resources, digital walkie-talkies will surely have a huge demand market.
"Simulation" curtain call?
From January 1, 2011, the Chinese government will stop issuing model approval certificates for analog walkie-talkies, and extend the effective time of one year for the type approval certificate obtained, that is, "5 1", that is, on January 1, 2011. The previous certification was valid for 6 years. According to Xie Feibo, Director of the Bureau of Radio Management of the Ministry of Industry and Information Technology, although the market for digital wireless walkie-talkies is much smaller than 3G/4G, its social benefits and status are very important.
So, does this mean that China's professional wireless intercom will achieve full digitization after 2016? the answer is negative.
Although early in the 1970s, Motorola led the introduction of digital technology to the system design of walkie-talkies. In 2007, it introduced digital walkie-talkie products based on the DMR standard, while Japan’s Kenwood and Ai’i Kemu also launched digital walkie-talkie products based on DPMR in 2008 and began to sell it worldwide. However, even in developed countries such as Europe and the United States, digital wireless intercom is still in its infancy, regardless of the market area or industry scale. One of the main reasons is that the prices of digital wireless walkie-talkies are too expensive and the prices are often in the thousands.
We know that most of the word walkie-talkie solutions are based on general-purpose chip platforms, and there are no mature digital walkie-talkie-specific chip platforms, so the solution cost is too high. The key to breaking the digital walkie-talkie industry's scale is whether it can reduce the sales price of digital walkie-talkies, but it will take time. In addition, there is another reason, that is, in the era of traditional walkie-talkies, its functions are relatively single and its application occasions are relatively small. In the long-term use process, the market has formed an inertial understanding that the walkie-talkie is used for intercom calls. The traditional analog walkie-talkie can well meet this application requirement. Even in the digital era, this inertial understanding still exists, which has affected the popularity of digital walkie-talkies. Therefore, for a long time to come, traditional analog walkie-talkies will still take the initiative.
Chasing Motorola
At present, the number of analog walkie-talkies produced by China's walkie-talkie companies has reached 80% of the global market share, and it is already the world's largest analog walkie-talkie industrial base. However, foreign manufacturers represented by the Motorola system account for only 20% of the global analog walkie-talkie sales, but they account for 80% of the total sales of the global analog walkie-talkie. In the field of core technologies and independent innovation, China’s walkie-talkie companies and the entire industry are still lagging behind.
In the digital age, with the abundance of appearances and functions of walkie-talkies, the application range of walkie-talkies will be amplified. Beyond performance, users will pay more attention to applications and services. Therefore, localized development and localization services will become more important. The advantages of our walkie-talkie companies. At present, the global walkie-talkie industry is in a critical period of “modulation transferâ€. China's walkie-talkie companies should strive to seize this opportunity to shorten the gap with foreign manufacturers, and the breakthrough is the standards and chips.
At the standard level, due to the fact that DMR and DPMR foreign standards have already formed de facto international standards, in this case, independent technical standards and technical specifications that are suitable for the development of China’s industries are formulated. The actual benefits are not significant, but more symbolic. significance. Moreover, due to the small average size of Chinese walkie-talkie companies and relatively weak corporate R&D capabilities, the development of standards with independent intellectual property rights faces real challenges.
The chip field is a good breakthrough. The chip is at the top of the industrial chain, masters the chip, and stands at the vantage point of the industry. It can break the monopoly of foreign manufacturers represented by the Motorola system in the digital walkie-talkie industry. It is reported that the Fujian province where the walkie-talkie industry ranks first in the country has successfully researched and developed special chip for digital walkie-talkies, which fills the gap in domestic research and development of the core technology of the industry and has a significant impact.
However, as Wang Haiming said, the Motorola system has patents in the field of wireless intercom, with technology, experience, and reputation, and has established a sound industrial ecosystem. “The key is that we have continuous investment and innovation.†Therefore, it is difficult for domestic walkie-talkie companies to challenge the supremacy of Motorola's achievements for decades. To achieve a breakthrough, there must be government guidance and support at the policy and funding levels. TD-SCDMA is a good example.
Walkie-talkies have been regarded as part of production investment and the value chain of enterprises. Therefore, one of the concerns of industrial companies and government agencies when purchasing walkie-talkies is to minimize the cost of wireless intercom systems (note that the cost of the entire system is not Walkie-talkie cost). One of the most effective ways to reduce the cost of the intercom system is to increase the coverage by high power and reduce the number of wireless transmitting base stations. Due to the high power of a radio transmitter, the radio must also operate at a higher power level to communicate with the base station.