What is a Portable Radio?

A radio is a machine constructed by mechanical devices, electronic devices, magnets, etc., which converts electric wave signals with electrical energy and can listen to radio stations to emit audio signals. Also known as radio, radio, etc.

Radio abroad development

Ore Radio

We are used to referring to those radios that do not use a power supply and only have a semiconductor element in the circuit. Ore radio refers to a passive radio without an amplification circuit composed of an antenna, a ground wire, and a basic tuning circuit and ore as a detector. It is the simplest radio receiving device and is mainly used for receiving medium-wave public radio broadcasts.

In 1910, American scientists Dunwoody and Picard used ore as a geophone, hence the name. Ore radios do not require power and have a simple structure. They are loved by radio enthusiasts. Many enthusiasts still like DIY and research. But it can only be listened by one person, and the reception performance is also relatively poor. At the time, it also objectively restricted the popularity and development of radio broadcasting.

Tube radio

In 1904, the world's first electron tube was born under the hands of British physicist Fleming. The birth of human first electron tube marked that the world has entered the electronic age ever since.

An electron tube is an electronic device that generates current conduction in an air-tight closed container (usually a glass tube) and uses the effect of an electric field on the electron flow in a vacuum to obtain signal amplification or oscillation. The electronic tube is the originator of the electronic age. After the invention of the electronic tube, the circuit and receiving performance of the radio revolutionized and improved.

Before 1930, almost all tube radios were powered by two sets of DC power supplies, one as a filament power supply and one as an anode power supply, and the power consumption was relatively large. It would take a long time to replace the battery, so the use of the radio higher cost. Around 1930, the use of AC power radios was successfully developed, and tube radios came into people's homes to a large extent. However, due to the disadvantages of large volume, large power consumption, severe heating, short life, low power utilization efficiency, fragile structure and high voltage power supply, most of its applications have been basically replaced by solid-state transistors.

Transistor radio

A transistor is a solid semiconductor device that can be used for detection, rectification, amplification, switching, voltage stabilization, signal modulation, and many other functions (metals such as gold, silver, copper, and iron, which have good electrical conductivity and are called conductors. Wood, glass, ceramics, Mica and other materials are not easily conductive and are called insulators. The substance whose conductivity is between the conductor and the insulator is called a semiconductor. Transistors are made of semiconductor materials. The most common materials of this type are germanium and silicon.)

On December 23, 1947, the first transistor was born at Bell Labs in the United States. This was a major invention of the 20th century and the forerunner of the microelectronics revolution. Since then, humans have entered the rapidly developing electronic age.

Transistor radio is a small transistor-based radio receiver. On October 18, 1954, the world's first transistor radio was put on the market, containing only four germanium transistors. It was only after the advent of transistors that radios really began to spread. China also began to develop transistor radios in the late 1950s, and a production climax in the 1970s. In 1958, China's first domestic semiconductor radio was successfully developed.

Transistor radios have won the people's favorite because of their low power consumption, no need for AC power, small and exquisite, easy to use, and gradually dominated the market, and became the most popular and cheap electronic products.

The transistor is one of the greatest inventions in modern history. Since the invention of the transistor, electronics have made rapid progress. In particular, the appearance of PN junction transistors has opened a new era of electronic devices and caused a revolution in electronic technology.

IC Radio

On September 12, 1958, American Jack Kilby developed the world's first integrated circuit. Since then, integrated circuits have gradually replaced transistors, made the emergence of microprocessors possible, laid the foundation for modern microelectronics technology, and also laid the foundation for modern information technology. It has created a new era in the history of electronic technology, and we are used to everything. The emergence of products becomes possible.

On an extremely tiny semiconductor wafer of a few square millimeters, thousands of transistors, resistors, capacitors, and connecting wires are combined together, and an electronic component used as a device with a certain circuit function is called an "integrated circuit" . The integrated circuit has the advantages of small size, light weight, fewer lead wires and solder joints, long life, high reliability, good performance, etc. At the same time, the low cost facilitates mass production. Essentially, integrated circuits are state-of-the-art transistors. Integrated circuits have made electronic components a major step toward miniaturization, low power consumption, and high reliability. The use of integrated circuits to assemble electronic equipment can increase assembly density by several tens to thousands of times over transistors, and the stable working time of the equipment can be greatly improved.

In 1982, integrated circuit radios appeared in China.

DSP radio

The DSP technology radio is a new type of radio that the radio analog signal is received by the antenna induction, amplified in the same chip, then converted into a digital signal, the digital signal is processed, and then the analog audio signal is output. The essence of DSP technology is to replace "hardware radio" with "software radio", which greatly reduces the threshold of radio manufacturing.

Radio China Development

January 23, 1923

The American Osborn and the Chinese Zeng Jun founded the China Radio Company, which broadcasted radio programs in Shanghai for the first time through a self-built radio station and sold radios at the same time. There are more than 500 radios in the city receiving the radio broadcasts. This is the earliest radio in Shanghai. Since then, with the continuous establishment of radio stations, radios have gradually risen in the Shanghai area. They are all imported products. They are the most produced in the United States. The first type is ore radio, and the second is tube radio.

August 1924

The Ministry of Communications of the Beiyang Government announced the provisional regulations for the installation of broadcast radio receivers, allowing citizens to install radios. There is a growing number of citizens who install radios, and their methods are mostly regenerative line connections. In August of the same year, Yan Jingyan of the Shanghai Jiande Savings Association successfully installed a radio using a super-heterodyne line connection method. In October of the following year, Amei Radio Co., Ltd. successfully tested the assembled ore radio and tube radio in the Songjiang Library. It received not only radio waves from Shanghai Radio, but also music programs broadcast by Japanese Radio.

October 1933

Yamei Radio Co., Ltd. has produced No. 1001 ore radio, which has a small and beautiful appearance, low price, and good radio reception, and is welcomed by the public. In October 1935, the company produced the first 1651 superheterodyne five-lamp radio. In addition to the tube and carbon resistance, the high- and middle-cycle transformers, power transformers and coils used in this machine are designed and manufactured by themselves. Since then, a number of radio manufacturers have successively produced radios. Among them, Zhongyong Radio Factory is larger in scale, second only to Yamei Radio Co., Ltd. In 1936, it produced standard three-loop one-light radios and three-light radios. In addition, there are still Huachang Radio Factory and Yaer Electric Co., Ltd., which have produced one-light to five-light radios. Although the production methods are relatively backward and the number of products is not large, these products occupy a certain position in the domestic radio manufacturing industry.

1936

With the development of the broadcasting station business, the radio has gradually spread throughout the city, with a total of about 100,000 or more, but almost all of them are foreign products, making the domestic national radio manufacturing industry develop slowly. In July 1937, the anti-Japanese war broke out in all directions, and Shanghai's radio manufacturing industry was further hit. In 1942, the Japanese invading Shanghai banned citizens from using radios with more than seven lights, and forced citizens to dismantle the short-wave coils of radios. Under the rule of Japanese and pseudo-pseudo-government, production of radio manufacturers was stalled.

1945

After the victory of the War of Resistance Against Japanese Aggression, the national radio manufacturing industry in Shanghai was restored and a number of new radio manufacturers were developed. By the end of 1947, there were a total of 590 industrial and commercial enterprises in Shanghai, of which 235 were radio and commercial industries. In the same year, the National Resources Commission established an institute in Shanghai, making a resource-brand desktop and floor-standing eight-lamp high-end radio. However, because bureaucratic enterprises imported a large number of complete radio parts from abroad and sold assembled radios at low prices, it brought a new blow to the national radio manufacturing industry. By the eve of Shanghai's liberation, more than 30% of the Shanghai Telecom Industry's factories were in a state of stoppages and semi-stoppages. Only 7 factories and workshops were engaged in the manufacture of radios and parts, with a total of 113 employees. By the way, Yamei and Zhongyong were the leaders of the radio industry in Shanghai and even in the country at that time, and Yaer's electric bulbs were absolute brand names at the time. ^[3]