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Chapter 1732 Fairy Stone Sound Transmission

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    As for receiving radio, it is much easier. A mineral radio that does not require a power supply can do it.

    It is much more sensitive than the mineral powder detector used by Popov and Marconi, but the manufacturing process is simpler and it is made directly from natural ore.  The most preferred among them is the pyrite crystals that are abundant on Xishan Island.  This metal oxide is a natural semiconductor.

    Of course, in the Taoist Research Institute, this beautiful pyrite crystal is called the Immortal Stone of Sound Transmission.

    When used, the ore is contacted through a metal probe.  By adjusting the position of the probe's contact point on the ore, you can find the contact point with semiconductor effect.  Using the semiconductor effect at this point, radio waves in the air can be picked up.

    In addition to the ore detector, the antennas, ground wires, coils, and capacitors required to manufacture the ore radio are all technologies that the research team already possesses.

    The only thing that needs to be solved is how to observe the received radio signals.  The team's initial design was to use the principle of electromagnetism, which attracts the swing of a small metal needle, and the telegraph operator would record the telegram by observing the swing of the watch needle.

    But in the experiment, it was found that it was not easy to ensure the accuracy of the recording, and it could not be used on a bumpy ship.  Wang Zheng made a simple electric bell to solve the problem.

    When receiving the signal, the electromagnet becomes magnetic and attracts an iron piece.  After being disconnected, the iron piece rebounded by its own power and struck a bell, turning the electrical signal into an acoustic signal.

    Nowadays, the receiver improved by Wang Zheng can not only ring the bell, but also record different code signals on the paper tape, which greatly improves the accuracy of reception.

    ??~~

    "The 762nd experiment of Qianli Sound Transmission has begun!" Zhang Jian announced loudly in the laboratory.

    When Zhao Hao solemnly pressed the electric button, he saw continuous blue sparks produced between the two small balls in the spark gap.  It made him think that he was cooking on an electronic stove.

    At the same time, the armature of the boost inductor vibrates like an electric bell, producing transmission side tone - the beeping sound heard when sending and receiving telegrams. This is to allow the sender to hear the sound of his own telegram at the same time.

    Immediately afterwards, a crisp electric bell rang in the backyard. That was when the receiver received the signal!

    "It was really successful!" Soon, Zhao Shizhen, who was guarding the receiver in the backyard, rushed in with excitement and shouted: "Suddenly the bell rang, which shocked me!"

    "Yes, this is just a small, insignificant step, but a giant leap for mankind!" Zhao Hao nodded with a smile and gave a few genius disciples loving hugs.

    But it¡¯s not time to celebrate yet, because this only proves the feasibility of sending and receiving radios at short distances, and we don¡¯t know how effective long-distance sending and receiving is.

    Radios that can only send and receive at short distances are still scientific toys that are not practical.  Only with the ability to send and receive over long distances can radio truly function!

    So then everyone divided into two groups, and Xu Guangqi stayed in the Taoist temple to preside over the delivery and reception.

    Zhao Hao, Zhang Jian, and Wang Zheng left the Taoist temple with a transmitter and a receiver to test the current communication limits.

    Zhao Hao set the first field test one kilometer away from the Taoist temple.

    After the guards completed their guard against prying eyes, Wang Zheng led the researchers to open the two wooden boxes, one large and one small, and began to assemble them carefully.

    " What's in the big wooden box is Xu Guangqi's telegraph machine. Because of the Leyden jar and canned batteries, this one was a little laborious to assemble. It took almost a meal to install and debug it, and then sent a telegram to the Taoist Temple.  The content was temporarily thought up by Zhao Hao and asked by Zhao Shizhen:

    ¡®See simplicity and embrace simplicity¡¯.

    Two minutes later, the transmitter that had been installed suddenly rang a crisp ringtone.  At the same time, the incoming signal began to be recorded on the paper tape.

    ¡®¡ª¡¤¡ª¡¤¡ª¡¯, the first thing received is such a series of signals.  In the code compiled by Zhao Hao, this means starting transmission.

    Then there is a series of signals, which are translated into a series of four-digit numbers, such as ¡®1223¡¯, ¡®2234¡¯, ¡®8961¡¯ and so on.

    Finally, there is the signal ¡®???¡ª?¡¯ that represents the end of the transmission.

    This Zhao Hao code, later referred to as "Zhao code", basically comes from Morse code.  But Moss wanted to use different electrical signals to form numbers and twenty-six letters, as well as some punctuation marks.  The 'Zhao code' only needs to use electrical signals to represent ten numbers.

    He also ordered people to collect and sort out 7,000 Chinese characters, add various numbers, punctuation, and pinyin symbols, and compile them into a "Code Book".

    Then, each character was numbered using scientific numbers, resulting in more than seven thousand different sets of four-digit numbers.

    This ¡®four-code method¡¯ is the simplestOur officers and soldiers are all politically strong, loyal and reliable veterans selected from various war zones and garrison areas.  Fleet Commander Mei Ling and Police Commissioner Kang Jia both hold the rank of junior police superintendent.

    Although the Guards Fleet is subordinate to the General Headquarters, it accepts the leadership of the Security Department, that is, Gao Wu.

    Speaking of which, more than ten years have passed, and Gao Wu¡¯s title is still Director of Security.  But his team has expanded to more than 30,000 people and even has a fleet.

    ??And it seems that when the radio station is officially put into use, a special communications department will be established.  It has been rolled out at home, in overseas administrative regions, and in all war zones, and security and confidentiality work must be done well. Not even 10,000 people can handle it.

    A section chief under him can make Zhao Hao¡¯s civil servants frightened by the news.  Hey, what's that person's name?

    ¡°Oh, I can¡¯t remember.  Forget it.

    Therefore, the job title is not important. What is important is the distance from the top leader and the actual amount of power.

    ps. In fact, writing how to make a transmitter is the most tiring thing. It makes me blind to look up the information, and it takes a lot of time.  I know that many readers don't like to read it, but I considered it necessary to write this because it is the last and most important invention of this book.  If you can't figure it out, you won't be able to write about it later. If you figure it out, if you don't write it thoroughly, it will make people feel that you are cheating just to complete the book.  Anyway, in order to make the rest of the story solid, I¡¯d better write it.

    ?????????????????????????????????????????????? Never again.  (Remember the website address: www.hlnovel.com
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