119 years ago today, on January 13, 1906 (December 19, 1905 lunar calendar), the Russian physicist and inventor of the radio Bobov died. Bobov (§¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â§³§ä§Ö§á§Ñ§ß§à§Ó§Ú§é¦°§à§á§à§Ó)£¬ Russian physicist and one of the founders of radio communication. Born in Urals on March 16, 1859, died in Petersburg on January 13, 1906. Graduated from Petersburg University in 1882, he was then hired to teach at the Langstadt Mine School. In 1888, the experiments of H.R. Hertz, the French E.E. Branley and the British O.J. Lodge on metal powder detectors inspired Bobov to establish the belief that electromagnetic waves could transmit signals, and in 1894 he made a radio receiver. The receiver used his improved metal powder detector and for the first time used an antenna on the receiver, which improved the sensitivity of the machine. This machine was mainly used to detect lightning, so it was called a lightning recorder. On May 7, 1895, Bobo published a paper "The Relationship between Metal Powder and Electrical Oscillation". Soon Bobo replaced the bell with a telegraph as the end point of the receiver, forming a relatively complete radio transceiver system. On March 24, 1896, Bobo and his assistants transmitted a short telegram between buildings 250 meters apart. A radio station was established in Langstadt in 1897, and communication was achieved between two warships Africa and Europe, which were 5 kilometers apart in the summer of the same year. In early 1900, Bobov increased the communication distance of the radio station to 45 kilometers. In order to commemorate Bobov's outstanding contributions to radio, the Soviet government designated May 7 as the Soviet Radio Festival in 1945. In 1877, at the age of 18, Bobov was admitted to the Department of Mathematics and Physics of Petersburg University, and later transferred to the Forestry Institute. There, he developed the remote-controlled explosion of explosives with wires. After his research was successful, his classmates called him "explosives expert". When Bobov was 29 years old, the news of Hertz's discovery of electromagnetic waves reached Russia, and he was strongly attracted. He said excitedly: "I spent my life installing electric lamps, which only illuminated a small corner of the vastness of Russia; if I could direct electromagnetic waves, I could fly across the whole world!" The next year, Bobov successfully repeated Hertz's experiment. In a public lecture, he proposed the idea of radio communication using electromagnetic waves. In 1894, Bobov made a radio receiver, and he used an antenna for the first time on the receiver. This was also the first antenna in the world. On May 7, 1895, at the physics branch of the Russian Society of Physical Chemistry in Petersburg, Bobov read the paper "The Relationship between Metal Shavings and Electrical Oscillation" and performed his invention of the radio receiver. After the performance, Bobo said confidently: "Finally, I dare to express the hope that my instrument, with further improvement, will be able to communicate over long distances by means of rapid electrical oscillations." Decades later, this day was designated "Radio Tomorrow". After Bobo's paper and performance were published in relevant journals, it immediately attracted the attention of the global academic community. Later, Bobo replaced the bell with a telegraph as the end point of the receiver, and the device became a radio transmitter. On March 24, 1896, Bobov and his assistant Rebkin officially performed a radio transmission of Morse's telegram code at the annual meeting of the Russian Physical and Chemical Society. There were more than a thousand people present. During the performance, the receiver was installed in the conference hall of the Physical Society, and the transmitter was placed in the chemistry museum of the nearby Forest College. Rebkin sent a signal, and Bobov received the signal. The communication distance was 250 meters. Professor Petroshevsky, president of the branch of the Physical Society, wrote the received telegram letters one by one on the blackboard, and the final message was: "Heinrich Hertz". It expressed Bobov's admiration for the inventor of electromagnetic waves. Although this telegram is very short and only has a few words, it is the world's first wireless telegram with definite content. Comment: The invention of radio contributed a lot