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Free Web Novel,Novel online - All in hlnovel.com -> Sci-fi -> We live in Nanjing Text Chapter 34: What does a teacher do?
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- Banxia holds a small green PCB board in her hand, looks at the light, it is slightly bigger than her thumb, and there is a wire more than ten centimeters long hanging from it. It is a thin white wire, soldered at both ends. A square circuit board of the same size, in Banxia¡¯s hand, the board at this end is marked with a vague ¡°tx¡±, and the board at the other end is marked with ¡°rx¡±. This thing is inserted into the repeater. One end is plugged into the transmitter, and the other end is plugged into the receiver to connect the two base stations.
The pcb board is covered with green solder resist oil, and regular wiring can be seen under the thin solder resist oil. This circuit board is small and simple, with neatly arranged silver strips of solder pads, marked with white English abbreviations.
"Well mic audio"
Pinellia looked at it carefully.
"ptt."
"gnd."
"rx audio."
"cor out."
She didn't understand what the abbreviations meant, but she could guess what the pins were marked for.
This is the simplest circuit board, so simple that it does not even have the most basic components, and it weighs only a few grams in the hand, but it embodies the highest wisdom of the third industrial revolution of mankind. Born in a small plastic sheet, pcb boards have since replaced complex and huge physical cables and lines. People use printing methods to two-dimensionalize sophisticated and complex circuits like drawings, lay them on a plane, and create complex designs like cities. Miniaturized to a few millimeters, a huge information kingdom is built.
Before the world was destroyed, how far did human civilization develop?
The girl raised her bare feet, rocked the chair creakingly, raised the circuit board in her hand, squinted one eye, and focused her gaze on the small circular through-hole of the circuit board. Perhaps she could understand the teacher's sadness And pain, this magical creation, was placed in front of her, but she couldn't understand it.
This is an ability that humans once had.
Now it is lost.
Ban Xia recalled the days when the teacher was still there. At that time, she was still young. The teacher took her around to pick up garbage, and built a strong fortress with the garbage picked up bit by bit.
The teacher is from the old times, she knows the world before the doomsday very well, Ban Xia has guessed the occupation of the teacher, but the latter's powerful ability like a generalist makes Ban Xia unable to confirm what she is doing before the disaster strikes Yes, the teacher is good at survival in the wild, and her marksmanship is very accurate. Banxia thought she was a soldier, but she also knew how to build a power network and repair complex household appliances. She was like an electrician¡ª¡ªWhat surprised Banxia most was the teacher I have studied astronomy and aerospace engineering for a long, long time (Banxia doesn¡¯t know what astronomy and aerospace engineering are, these two words were told to her by Bai Yang), the teacher once collected a lot of data, but in the end was rejected She burned them all.
In those years, the teacher sat in the room flipping books and drawing pictures, and asked Banxia to go aside to play with mud. Occasionally, Banxia sneaked into the room, and you could see the wall full of draft paper.
"Teacher is definitely saving the world!" Ban Xia said to Bai Yang, "She is looking for a way to drive away this world-ending disaster!"
"But there are only two of you left in the world." Bai Yang asked, "How can this be saved? Can it bring everyone back from the dead?"
"I don't know, she must be looking for a way." Ban Xia said, "The teacher is such a powerful person, she is the only one who survived the disaster! One in a billion, such a person Isn't he the savior destined by heaven?"
"And you, Missy, you are also a survivor."
"I'm just the one who was saved by her. I belong to the kind that drags my feet." Ban Xia said, "Without her, I wouldn't be able to live at all. Without me, she should be able to live until now."
"It's a pity that the teacher didn't leave any useful information." Bai Yang sighed.
"She burned all her information." Ban Xia said, "Who would have known that this would happen? I can contact you."
"It would be nice if she left it to you." Bai Yang scratched his head, "Then we won't be as confused as we are now, neither knowing what happened nor why."
"But she didn't leave it to me. If you had contacted us five or six years earlier, then you would have been able to talk to the teacher." Ban Xia said, "It's all time travel anyway, why can't you push the time back five years?" Years? The teacher was alive five years ago, she knew everything."
"It's not for me to decide, miss." The other end of the radio said leisurely, "God has given us this opportunity. It's rare, so we can't pick and choose. I also figured out that it's your teacher."
"Oh?" The girl raised her eyebrows, "I don't want tolove me? "
"NoI didn't mean that." Bai Yang stuttered, "I mean your teacher is more useful"
"I am useless?"
"You are useful!" Bai Yang said decisively.
"What use am I?"
"Youyou are the last hope of all mankind from ancient times to the present, the most important last person in human history, the eldest lady who is a priceless treasure, the highest IQ in the world, the most accurate marksmanship, the best arrow skills, and the prettiest appearance , the man with the best figure!" Bai Yang finished in one breath.
Ban Xia's eyeballs rolled around, her lips pursed and raised in a small arc, making a soft nasal sound.
"snort."
¡¤ ¡¤
¡¤ ¡¤
¡¤ ¡¤
Thursday.
Half of Wang Ning's obese body was leaning out of the window, holding a two-meter-long whip antenna high in his hand, sweating profusely.
He wore headphones, listened carefully for a while, and then yelled into the community: "I can't hear anything! Lao Bai, did you send the message¡ª?"
"No¡ª¡ª!"
Bai Zhen stood far away on the edge of the lawn in the community downstairs, with a folding wooden table in front of him, and a black digital amateur radio station on the table. uv5r amateur radio handset, the other hand is on the digital radio station on the debugging table.
"Then you fucking speed up¡ª! I can't maintain this position for too long¡ª!" Wang Ning hissed and roared, "My waist is about to break!"
"Okay yes, okay, no problem, I'll give it to you later."
"Old Bai, did you fucking send the message¡ª?"
"No¡ª¡ª!"
"Then what are you chattering about? What are you talking about¡ª?"
"Old Zhao called me¡ª!"
"Where did he get so much bullshit¡ª!"
"How do I know where he's talking so much¡ª!" Bai Zhen yelled upstairs first, then lowered his head to make a phone call, "Huh? It's not that you're not talking about you, he's talking about his father many."
This is their sixth experiment today.
The scene of the experiment is quite large. The relay station, base station, and spectrum analyzer are all used. Wang Ning and Bai Zhen have initially completed the remote control system. They started the experiment at nine o'clock this morning and were busy until four o'clock in the afternoon. Constantly debug equipment to achieve the best condition.
The distance between different devices is far apart, and they are placed as far away from each other as possible.
The repeater and the second-hand icom725 are connected together and placed on the desk in Baiyang¡¯s room¡ªthis is because the second-hand icom725 shortwave station needs to borrow the DP antenna from Baiyang Radio. The 14MHz dipole antenna is a full 20 meters long, like It is hung on the roof like an oversized clothesline. There is no way to temporarily assume it, so you can only borrow a ready-made one.
The antenna that the repeater needs to use is a 144mhz whip antenna with a length of two meters. They gave up the duplexer in the modification plan, so they simply use two antennas, one for the transmitter and one for the receiver. , Each used its own, and Wang Ning held them in his hand and held them out of the window.
In order to avoid mutual interference, Wang Ning should keep the two antennas as far away as possible, so he looks like an Ultraman with his hands raised out of the window at the moment.
To be honest, this posture is a bit scary, as if it is about to launch into space at any time and fly into the universe.
At the same time, Bai Zhen moved another amateur radio station, icom705, which he borrowed from someone.
Bai Zhen went downstairs with a folding table, set it up on the lawn of the community, and was kicked out by the security guards.
He changed the place, set up a table on the alley, set up the icom705 amateur digital radio station, set up the antenna, and attracted security again. He spent a long time arguing with the community security.
The new security guard thought the middle-aged man acted suspiciously, had suspicious equipment, and suspicious documents.
Bai Zhen asked, don't you know what ham is? I am ham.
The security guard said that if you are a toad, please go back to the pool.
Bai Zhen held the uv5r handheld in his hand, the icom705 on the table, and the antenna beside him. He was in charge of testing the remote control system in the headquarters.
The following signal link will be formed between these devices:
? When testing reception, Bai Zhen used uv5r to send calls outside, the signal was received by the gr3188 repeater, and the receiver of the repeater transmitted the signal to icom725.
When testing the transmission, Wang Ning used the icom725 in the room to send the signal, and the icom725 transmitted the signal to the gr3188 repeater, and the transmitter of the repeater sent the signal to Bai Zhen, and Bai Zhen's icom705 amateur radio station was responsible for receiving it.
If there is no problem with sending and receiving, then bg4msr can replicate an identical system as it is.
Due to the serious shortage of manpower, Wang Ning and Bai Zhen could only use one person as two people. Bai Zhen went downstairs with the mobile station and opened the distance, while Wang Ning listened to the signal with earphones, and at the same time propped up the antenna as a human shelf.
"Attention, attention, all departments." Bai Zhen pressed the ptt button of uv5r, "Reverse the future and save the world amateur radio emergency command, the sixth experiment of the remote control system, start now!"
</div>.
If there is no problem with sending and receiving, then bg4msr can replicate an identical system as it is.
Due to the serious shortage of manpower, Wang Ning and Bai Zhen could only use one person as two people. Bai Zhen went downstairs with the mobile station and opened the distance, while Wang Ning listened to the signal with earphones, and at the same time propped up the antenna as a human shelf.
"Attention, attention, all departments." Bai Zhen pressed the ptt button of uv5r, "Reverse the future and save the world amateur radio emergency command, the sixth experiment of the remote control system, start now!"
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