Liberate yourself Chapter 22

1

Life is always changing, but the environment is always unpredictable. We don't have to wait until life is flawless, and we don't have to wait for what is called the timing. As long as you think about what you want to do, any time will be a good time.

In my boyhood, there were often extracurricular activities in school, such as amateur radio activities. In order to support my family, my eldest brother was working and earning money when he was only 14 years old. He lost the same learning opportunities as his peers, but he was hooked on this technology activity at that time.

Big Brother is a carpenter in a house management office, and he often has to go to each house to repair a house. When Big Brother once went to a family to repair the house, he was very surprised to see the children of the host playing with the ore machine. Since then, Big Brother decided to assemble the ore machine by himself.

What is an ore machine? In fact, the simplest radio is the ore radio. A pair of headphones, an active ore detector, a variable capacitor, a few enameled wires can be done. At that time, people were not wealthy. Headphones were the most expensive parts. I remember it was 4.98 yuan each. The 5 yuan at that time was the tuition for one semester.

The copper oxide detector on the ore machine is made directly by the copper sheet. The method is actually very simple. Big Brother found a piece of copper of a suitable size. The surface of the copper was very smooth. The elder brother used toothpaste to polish the surface, and the surface of the copper sheet was already pure enough. The elder brother used a delicate fire to heat one end of the copper sheet. It can be seen that the copper oxide gradually spreads in the air, and a colorful copper oxide film appears. The copper oxide detector is now ready. Big Brother also used a 2B pencil carbon core, after sharpening, he slowly touched the copper sheet, adjusted the pressure, and made another pole.

I have seen the cross-shaped coil frame made by Big Brother before. He made a hexagon. It is calculated that the receiving area can be increased. The two white support rods are used by Big Brother for house decoration. The wire scraps are made by sawing from the middle. In order to catch the coil, he sawed the slot again.

The coil, usually a common wire that my brother went to the electrical store, has a total length of about 22 meters. He made a total of 9 turns, and welded the lead wires at the 6th, 7th, and 8th turns, so as to test which one is the loudest.

Radio tuning uses a group of 360P dual-connectors. The detector uses a 2AP9, the filter capacitor is 3300P, and the output transformer is a 220V to 6V common power transformer. These equipments are all scrap materials, and my brother will often take me to Niuzhuang Road to Taobao. The transformer was originally broken, the primary connector was blown out, and Big Brother would weld it carefully.

Because he couldn't afford high-impedance headphones, Big Brother had to make use of a transformer plus a speaker. He connected two 8Ω speakers in series to 16Ω, and bent a shelf with iron wire anyway, so that the speaker could be used as a headset.

To save money, those old appliances became his brother's treasure. He removed the enameled wire from the burnt-out bell coil. Big Brother wound the enameled wire on a cardboard tube to make a coil. The coil is connected in parallel with the variable capacitor, and then one end of the ore is connected to the variable capacitor, the other end of the ore is connected to the earphone, the other end of the earphone is then connected to the variable capacitor, and the two ends of the variable capacitor are respectively connected to the antenna And the ground line, an ore radio is installed.

The ore radio, so a simple combination of a few components that do not use batteries, can make such a clear and pleasant sound, it is really amazing!

A person can never predict the future, and life is only momentary. Everyone's life has an end. Many people often find that there are still many things they haven't done until the end of their lives. There are too many words to say. This is really the greatest regret in life.

2

I don’t know when the human race has entered the high-tech information age. WIFI entered the lives of ordinary people. When it comes to WIFI, many people’s first impression is that the signal sent by the router at home can be used to connect to a mobile phone or a laptop for wireless Internet access. With the advancement of technology, more and more smart devices have entered the homes of ordinary people. These are all kinds of Smart devices are connected to the Internet through WIFI signals, which is often referred to as the Internet of Things, and we are about to enter the era of Internet of Everything. However, all this depends on WIFI to realize the interconnection of all things. With the popularization of 5G, the world has witnessed a 5G war. Will WIFI be replaced? Whether it will be replaced in the future is hard to say, but what is certain is that most of the smart devices at this stage still rely on WIFI signals for connection.

For ordinary netizens, maybe they can check the Internet or play mobile phones, but they will not care about the origin and development of WIFI and 5G. Ordinary netizens hardly pay attention to who first invented WIFI?

Out of curiosity, I sneaked into this mysterious field and wanted to understand the development of WIFI. It turned out that WIFI was originally created by a team led by Dr. John Sullivan. Dr. John Sullivan is an Australian. This team belongs to one of Australia's largest scientific research institutions and is called the Commonwealth Scientific and Industrial Research Organization. It can be said that the WIFI technology we use all the time belongs to the country of Australia. The Australian government only because of this invention, until today, their country can obtain up to billions of dollars through WIFI patent fees every year. They successfully applied for a wireless network technology patent in the United States in 1996.

The IEEE (Institute of Electrical and Electronics Engineers) defined the 8021.11 standard in 1999. At that time, the wireless network technology of the Australian research team was selected because this was the best in the world until it became the core WIFI technology standard in 2010. IEEE once asked the Australian government to give up this patent and let it be shared free of charge worldwide, but it was rejected by the Australian government. Later, major equipment manufacturing companies all over the world have to pay royalties. These companies include: Apple, Intel, Lenovo, Dell, Sony, Toshiba, Microsoft, Acer, Asus, etc. With so many patent fees, the Australian government is definitely not willing to share them for free. Wireless network technology was once hailed by the Australian media as the greatest technological invention in their country's history.

There are four famous inventions in ancient China. Why is there no new four inventions that shock the world in contemporary China? Even if there is a new invention, it is worth the pride of the Chinese people!

I don’t know WIFI and 5G, but I also explored the secrets of radio when I was a kid, and I had to start with my big brother, who led me through the original wireless world.

3

In my childhood, when my elder brother was resting at home, my mother wanted him to control me. He was worried that I would run around. He would let me sit at the table and wear a pair of headphones to listen to music. At that time, what was amazing to me was how could such beautiful music suddenly disappear?

I carefully adjusted the ore detector and the variable capacitor, and the sound of the children’s song "Long Live the Three Red Flags" will be heard in the headphones.

Big Brother's own ore broadcast was successful! Can you imagine how happy I am? I jumped around and jumped up happily, telling everyone around me the news: "My brother's ore radio will sing!"

I especially think that "Big Brother" is great.

More than half a century ago, I was deeply moved to relive the boyish dream of ore broadcasting.

Radio communication is a communication method that uses electromagnetic waves to radiate and propagate information through space. In 1831, Faraday found that electric current can generate a magnetic field. In 1865, Maxwell in the United Kingdom theoretically predicted that any power fluctuation may induce the presence of electromagnetic waves at a certain distance, and the electromagnetic waves may be radiated from the location where the electromagnetic field is generated at the speed of light, but he himself failed to conduct experiments on his own. verification. In 1887, the German physicist Hertz proved the existence of electromagnetic waves through an electrostatic spark discharge experiment, and inspired the idea of ​​using electromagnetic waves. However, Hertz died young and failed to conduct scientific research on the application of electromagnetic waves. Sensitive inventors have realized that electromagnetic waves can be used for radio communication.

Scientists and inventors represented by Marconi of Italy and Popov of Russia, based on the knowledge of electromagnetic waves and electromagnetic waves mastered by predecessors, boldly explored and practiced, opened the door to the application of electromagnetic waves, and created radio New technology communications. It was they who successfully carried out the earliest radio communication activities in the world, and ushered in a new era of human communication.

In 1894, Marconi, who was only 20 years old, accidentally read Hertz's article on electromagnetic wave experiments. This article deeply moved Marconi, so he transferred all his interest to experiments using electromagnetic waves for communication, and was determined to realize radio communication. He said: "When I started the first experiments with Hertz waves, I couldn't imagine that some famous scientists would ignore the application of these theories."

Marconi said he could do it. He set up a radio transmission and reception experiment equipment on the top floor of his parents' villa. Initially, the communication distance was only 140 meters. He connected a very long wire to the copper ball of the oscillating dipole of the transmitter to increase the strength of the electromagnetic wave. This is an early radio antenna. He also used a powder detector as a receiver. In the summer of 1896, between the laboratory on the third floor of the villa and the hill 1.7 km away, he successfully achieved radiotelegraph communication. In the same year, Marconi, 22, arrived in the United Kingdom. With the support and sponsorship of the Director of the Price Bureau and the UK Department of Posts and Telecommunications, he continued to conduct experiments to expand the radio communication distance. In public, Marconi performed a radio telegraph communication performance of 10 to 20 kilometers. On June 2, 1896, Marconi submitted a telegram patent application to the British government, numbered 12039. In 1897, he established the Radiotelegraph and Signal Company (later Marconi Radio Company). At this time, he began to commercialize his invention. In 1899, a radio communication test spanning 51 kilometers across the English Channel was successful. In 1900, Marconi obtained the 7777 patent from the British government. In 1901, Marconi went to the United States. He successfully tested transoceanic radio communications between Newfoundland, Canada and Cornwall, England, and across the Atlantic Ocean for 3,000 kilometers.

Because of Marconi's contribution to radio communications, he won the Nobel Prize in Physics in 1909.

  Big Brother told me: At the same time as Marconi, Russian physicist Popov independently invented radio communication. As early as early 1889, he began to repeat Hertz's experiment. On May 7, 1895, Popov demonstrated the "thunderstorm indicator" he created at the Russian Physical Chemistry Society in Petersburg-this is actually a simple radio receiver because it discharges lightning strikes at high altitudes. The radiated electromagnetic wave is received and recorded through the electric bell or typewriter. At the end of the performance, Popov made it clear that it can be pre-asserted that after further improvement of my instrument, it can use fast electrical oscillations to send signals to distant locations. At this time and here, Popov has clearly foreseen the possibility and reality of using electromagnetic waves for communication. After gradual improvement, with the support of the Russian government, Popov gradually put the radio communication technology he invented into practical use.

Popov successfully carried out a 250-meter radiotelegraph communication on March 24, 1896. In the spring of 1897, at the dock of the Russian military port Kronstadt, Popov’s radio communication distance was extended to 640 meters; in the same summer, his radio communication distance reached 5 kilometers-in this experiment, Popov The influence of metal obstacles on electromagnetic wave propagation was also observed.

In 1906, the American physicist Feisenden invented radio broadcasting, which allowed radio waves to enter thousands of households, heralding the beginning of an information age.

4

In the era of the Great Leap Forward, the old lady Qiao Qi who lived in the three-story loft died. The small loft has been closed. My family does not believe in ghosts and gods, nor does it taboo the dead. The big brother opened the door of the small loft, and since then, the big brother and I have lived in this small loft.

This small loft has a sloping roof and the lowest entrance is less than one meter high. Only one bed and a small desk can be placed in the entire loft.

In order to debug the ore machine, the eldest brother installed an antenna on the roof. Later, he just opened the tiger's skylight in the small attic. Unexpectedly, this little loft actually witnessed the marriage history of three siblings in my family.

Remember, my brother and I used to catch sparrows in front of the skylight in the attic. In the national anti-sparrow movement, I live on Gaolan Road. The eldest brother drilled two small holes in a new biscuit box and struck the biscuit box with a rope to make a noise and drive out the sparrow. For this reason, the big brother was severely beaten by his father.

I asked my brother: "Father has been beating you, do you hate him?"

Big Brother shook his head: "Now, our mother often beats you too. You should not hate her. You must love your mother, your mother must work, this is working in our unit, it is very hard and tiring Work, you must know how to take care of your mother."

The eldest brother said to me: "Since our father was taken away, I miss him very much. A child without a father is a disaster."

The eldest brother told me that after his father was beaten by the government as a rightist, he was sent to Baimaoling Farm for labor reform. Later, he went to Anhui to work in a kiln factory on the outskirts of Hefei. The father wrote that he was injured at work, and his mother agreed to let him go to Hefei to visit the injured father.

I don’t remember what I said to my eldest brother, it seems difficult to understand, but I know my father is still alive.

The eldest brother said to me: "Looking at the stars outside the window, each star has its own position. Maybe I should be, my father is not here. As an older brother, I must be responsible to you and my sister. I want to provoke the economy of this family Heavy burden, if your mother is ill, don’t blame her temper, she is very bitter. You will understand your mother’s heart when you grow up. Don’t bully your sister, you should learn, be a kind person, can’t become A rude man. My dream is no longer to fly to the blue sky, I must be down to earth, I need to feed this family."

I will always remember that night, the stars that night. The eldest brother told me: "If you want to study hard, the whole family will depend on you. Mom and I have no education. You must be an educated person. If you want to change this family, hope is on you. "No wonder that day In the evening, my brother asked me to write a letter to my father, and he would give me my letter. This is also my first time writing to my father.

I still remember that from that day on, my brother stopped making model airplanes, and his ore radio never turned on again.

5

With the passage of time, today's children don't understand the ore radio. They follow the hobbies of adults, and they are obsessed with mobile phones. Mobile phones have become human partners.

Speaking of the world’s first mobile phone, many enthusiasts will remember the DynaTAC8000X that Motorola designed and produced in 1984. That's more than 2 pounds, charging time is 10 hours, but the talk time is only half an hour, and the sale price of 3,995 US dollars of mobile phones, is the veritable most expensive brick.

Although this is a mobile phone more than thirty years ago, it looks bulky and has a single function today. But its rigorous styling and exquisite processing technology are also worthy of everyone's careful work today. It is just old, but it does not mean that it is outdated, its significance will always be engraved in the history of the development of mobile phones. In the late 1980s, Motorola launched the world’s first clamshell mobile phone, the Motorola 8900. Moto8900 and other mobile phones are called "Big Brother", and once became synonymous with Chinese mobile phones.

Today, when the mobile phone market battle has reached a fierce stage, the popular mobile phone company Nokia has occupied the No. 1 market share for 14 consecutive years. The 7650 released by Nokia is the first Symbian S60 smartphone and created three world firsts in the world: the first camera phone with built-in camera, the first slider phone, and the first five-dimensional rocker phone. Super classic. Nokia launched another flagship model, the N95, with a unique two-way slide design, top luxury configuration, and powerful expansion functions. Whether it is entertainment or business needs, it can meet all aspects. From the perspective of its market sales, it says It is not an exaggeration to be a generation of machine emperors.

Looking back at the thirty-year history of mobile phones, the wheel of history is rolling, and a smartphone era has emerged. The most brilliant in this era are Microsoft Windows Mobile, Apple iPhone, Google Android, Android T-Mobile G1, and Huawei 5G in China has gradually become a strong competitor.

The mobile phone is not just a cold machine, it has temperature, it carries too many beautiful emotions of human beings. But what I get from the history of mobile phones in the past is more of my own thinking.

In the past, people with big brothers and big phones could look up proudly, but now people with smarter and more powerful phones have become bowing parties. What is the real meaning of mobile phones? I do not know. But I can’t forget the childhood radio radio era, when the dream of naive flying has been lost. Wireless communication has become the master of this world. In order to compete for the dominant position, this world is full of filth and depravity.

Don't let yourself be left empty and hate too late. The deceased cannot be chased, the comer is still unclear, the person is alive, the most precious and the most in need of real-time control is the present.