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Text Chapter 29: The Wisdom of the Uncles

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    ,

    In the following weekend, Bai Zhen and Wang Ning began to design the remote communication system.

    To put it bluntly, it is to let bg4msr use mobile phones.

    This is very important.

    The immediacy and convenience of mobile phones are much higher than that of landline phones. It's time to upgrade the girl's communication methods.

    "The technical logic is very clear, and it's not difficult to do." Sitting on the sofa, Wang Ning rubbed his bearded chin. "Fundamentally speaking, we only need to do one"

    "Relay." Bai Zhen sat opposite him.

    "Yes, we only need one relay." Wang Ning nodded.

    The so-called relay is an extremely common and commonly used infrastructure in amateur radio.

    As we all know, there are more people playing uv band than short wave these days. To play uv wave, you only need to spend 100 yuan on Taobao Jingdong to buy a mobile phone. This thing is not much bigger than a mobile phone. It is small and exquisite, easy to carry, and comes with a flashlight.  Press the button twice and the flashlight can blind your dog's eyes. It doesn't need a heavy and clumsy base station like short wave-but the uv band has advantages and disadvantages. Both uhf and vhf frequencies are much higher than short wave.  It is known that the higher the frequency, the shorter the wavelength; the shorter the wavelength, the weaker the ability to bypass obstacles.

    Therefore, the radio waves in the uv band propagate in line of sight, and the uv waves can only reach where your eyes can see. If there is an obstacle in the middle, the signal will be blocked.

    It does not bounce off the ionosphere like shortwave does.

    However, modern cities are full of high-rise buildings, buildings are layered on top of each other, and obstacles are everywhere. How can people who play UV band communicate long-distance?

    So people thought about it - it would be better to put a transponder on a high place.

    This repeater system can be placed on a high tower, on the top of a mountain, or even on a satellite¡ªit must be set up at a high place where everyone can see¡ªthe UV band handset in Ham¡¯s hand first sends the signal to the repeater  device, and then forwarded through the hands of the latter.

    Transponders stand high and see far away, and can spread signals to far away places. Amateur satellites or international space stations are in orbits hundreds of kilometers high, and can even support intercontinental communications.

    Such a forwarding system is called a relay station.

    "Relay?" Bai Yang was confused, he didn't understand how to use the repeater to establish remote control, "How should I do it?"

    "Xiao Yang, let you come up with the design, so that bg4msr can also use the two-five to contact us at a long distance, what are you going to do?" Wang Ning asked him.

    Bai Yang froze for a moment, and thought for a few seconds.

    "Uha radio communication link should be established, so that the sizebg4msr can transmit the signal to icom725 over a long distance, and let 725 transmit it to us."

    "Yes, the idea is correct." Wang Ning agreed, "but how to do it specifically?"

    "She should have a portable mobile station in her hand, as a terminal for sending and receiving information." Bai Yang further imagined, "She sends the signal to icom725 through the mobile station, and icom725"

    Here Bai Yang suddenly got stuck.

    "Forward."

    He realized that the role of 725 in the whole link at this time is to forward, the girl's mobile station transmits the signal to 725, and 725 forwards the signal to Bai Yang himself.

    What should be done to make 725 a forwarding node?

    All the functions of an old antique like icom725 have to be implemented purely manually. To send a call, you have to press and hold the button on the microphone, and to receive a call, you have to release the button on the microphone. How to operate it remotely?  You're not a robot, you can leave one hand in the room just to click the button.

    "The 725 alone can't do it by itself." Bai Yang said slowly, "A peripheral device is definitely needed. On the one hand, this peripheral device can send and receive radio waves by itself, and on the other hand, it can control the sending and receiving of the 725. When there is information to be sent, it  It controls the 725 radio station to enter the sending state, and when there is information to receive, it controls the 725 radio station to enter the receiving state.¡±

    "Savvy, savvy Xiao Yang." Wang Ning smiled, "Just like you think, we just need such a peripheral."

    "This peripheral is a relay." Dad said.

    "That's right, it's a repeater." Wang Ning nodded, "Xiao Yang, do you know the structure and working principle of a repeater? That kind of pure analog repeaterwe'd better use a purely analog repeater, digital  Relays or digital-to-analog relays are a bit complicated, and I¡¯m afraid the girls over there won¡¯t be able to handle them, and I¡¯m afraid that something too sophisticated won¡¯t last too long, but the structure of the analog relay is so simple that you can DIY it yourself with two walkie-talkies.¡±

    "Because the basic structure of a repeater station is two amateur radio stations put together back to back." Lao Bai took over his words and explained to Bai Yang, "One; This is very important, no matter what Dad and Uncle Wang want to do, it cannot affect the icom725 radio station itself. They still haven't figured out why this radio station has the ability to communicate through time and space.  Two or five is a black box. In this case, it is the most sensible choice not to touch it.

    Previously, Bai Zhen, Wang Ning, and Zhao Bowen recklessly dismantled the machine and opened the casing of the radio, but fortunately, it did not cause any impact.

    "Okay Thirdly, it must not affect the normal work of the radio station itself." Wang Ning wrote it down.

    Finally he held the whiteboard up high for everyone else to see.

    The handwriting is illegible but striking.

    First, the avatar is separated and controlled remotely!

    Second, the operation is simple, convenient and easy to learn!

    Third, it cannot affect the normal operation of the radio itself!

    The above three items will be the framework that they must follow when advancing the plan. They will do their best to upgrade the communication tools in the hands of bg4msr. When the expert group of the World Amateur Radio Emergency Communication Headquarters is fully operational,  The wisdom of the uncles will be invincible
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