We Live In Nanjing

  Chapter 74 What does the teacher do

Pinellia is holding a small green PCB board in her hand and looking at the light, it is slightly larger than her thumb. Below is a wire that is ten centimeters long. It is a thin white wire, soldered at both ends. With a square circuit board of the same size, the board in Banxia’s hand is marked with an ambiguous "TX", and the board at the other end is marked "RX". This thing is inserted in the repeater. It 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 mask, and regular wiring can be seen under the thin solder mask. This circuit board is small and simple, arranged with neatly arranged long silver pads, marked with white English abbreviations.

   "Hmm...MICAUDIO..."

   Pinellia takes a closer look.

   "PTT."

   "GND."

   "RXAUDIO."

   "COROUT."

  She doesn't understand what these abbreviations mean, but she can guess what the pins do.

This is the simplest circuit board. It is so simple that it does not even have the most basic components. It weighs only a few grams in the hand. However, it embodies the highest wisdom of the third industrial revolution of mankind. Born from a small plastic sheet, PCB boards have since replaced complex and huge physical cables and circuits. People use printing like drawings to two-dimensional sophisticated and complex circuits, laying them on a flat surface, and designing complex designs like a city. Shrunk down to a few centimeters, building a huge information kingdom.

   Before the destruction of the world, how far has human civilization developed?

The girl lifted her bare feet, shook the chair crunchingly, raised the circuit board in her hand, squinted one eye, and focused her gaze on the small circular hole on 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 the ability that humans once possessed.

   is now lost.

  Banxia recalled the days when the teacher was still a child, when she was still young, the teacher took her around picking up trash, using the trash to build a strong fortress little by little.

The teacher is a person from the old age. She knows the world before the end very well. Banxia has guessed about the teacher’s profession, but the latter’s powerful ability like a generalist makes it impossible for Banxia to confirm what she was doing before the disaster. Yes, the teacher is good at survival in the wild and her marksmanship is extremely accurate. Banxia thinks she is a soldier, but she knows how to build an electricity network and knows how to repair complicated household appliances. This is like an electrician—the most amazing thing about Banxia is the teacher’s research. After a long, long period of astronomy and aerospace engineering (Banxia didn’t know what astronomy and aerospace engineering are, Bai Yang told her these two words), the teacher once collected a lot of information, but she was finally All burned.

  In those years, the teacher sat in the room flipping through paintings and pictures, and asked Banxia to play in the mud. Occasionally, Banxia sneaked into the room, and the wall was full of draft papers.

   "The teacher is definitely saving the world!" Banxia said to Bai Yang, "She is looking for a way to drive away this world-destroying disaster!"

   "But the only two of you are left in the world." Bai Yang asked, "How can this be saved? Can it bring everyone back to life?"

"I don't know about this, she must be looking for a way." Banxia said, "A teacher such a great person, she is the only one who survived the disaster! One in billions, such a person Isn't it the savior destined by heaven?"

   "And you, Miss, you are also a survivor."

   "I'm just the one who was rescued by her. It's the kind of drag." Banxia said, "Without her, I wouldn't be able to live now. Without me, she should be able to live to the present."

  "Unfortunately, the teacher did not leave any useful information." Bai Yang sighed.

   "She burned all her data." Banxia said, "Who knows that this will happen? I can contact you."

   "It would be nice if she left it to you." Bai Yang scratched his head, "Then we will not be as confused as we are now, neither knowing what happened nor why."

"But she didn't leave it to me. If you contact us five or six years earlier, then you can talk to the teacher." Banxia said, "Anyway, it's all through time and space. Why can't you push the time forward five or six years? Years? The teacher was alive five years ago and she knows everything."

   "It's not for me to decide, Miss." The radio side said leisurely, "God has given us this opportunity is rare. Where else can I choose, I also figured out that it is your teacher."

   "Oh?" The girl raised her eyebrows, "Don't want to pass me?"

   "No... I didn't mean that." Bai Yang stammered at once, "I mean your teacher is more useful..."

"I am useless?"

   "You are useful!" Bai Yang is decisive.

  "What can I do?"

"You...you are the last hope of all mankind from ancient times to the present, the most important last person in human history, the invaluable eldest lady with a body of gold, the highest IQ in the world, the most accurate marksmanship, the best arrow skills, and the most beautiful appearance. The man with the best body!" Bai Yang said in one breath.

   Pinellia's eyeballs rolled round and round, and her lips were pursed upwards to evoke a small arc, making a soft nasal sound.

"Humph."

  ·

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Thursday.

  Half of Wang Ning’s fat body was leaning out of the window, holding two mop sticks high in his hand, with a two-meter whip antenna tied to the mop stick, sweating profusely.

  Wearing headphones, he listened carefully for a while, then shouted towards the community: "I can't hear anything! Old Bai, did you send the message—?"

"no-!"

Bai Zhen stood at a distance on the edge of the lawn of the downstairs community, with a folding wooden table in front of him. On the table was a black digital amateur radio station. He tilted his head and clamped the phone with his neck, holding Baofeng in one hand. UV5R amateur radio walkie-talkie, the other hand is the digital radio on the debugging desk.

   "Then you **** faster—! I can't hold this position for too long—!" Wang Ning hissed and roared, "My waist is about to be broken!"

   "Okay...Yes, okay, no problem, I'll give it to you later."

   "Old Bai, did you **** send the message—?"

"no-!"

   "Then what are you talking about? What are you talking about—?"

   "Old Zhao called me—!"

   "Where does he come from so much coercion—!"

"How do I know where he is so coercing!" Bai Zhen yelled at the upstairs first, then lowered his head to make the phone call, "Huh? It's not that you are not talking about you, he is saying that his father is talking too much. ."

  This is their sixth experiment today.

The scene of the experiment is quite large. Repeaters, base stations, and spectrum analyzers are all used. Wang Ning and Bai Zhen have initially set up the remote control system. They started the experiment at 9 o'clock this morning and have been busy until 4 o'clock in the afternoon. Constantly debug the equipment to achieve the best condition.

  The distance between different devices is opened far, 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 the Baiyang room—this is because the second-hand Icom725 shortwave station needs to borrow the DP antenna from the Baiyang radio station. The 14MHZ dipole antenna is 20 meters long, like a The oversized clothesline is placed on the roof, so there is no way to make assumptions, and you can only borrow the ready-made ones.

The antenna that the repeater needs to use is a 144MHZ whip antenna with a length of two meters. They abandoned the duplexer in the modification plan, so they simply use two antennas, one antenna for the transmitter and one antenna for the receiver. Wang Ning held his own hands 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 at this moment he looks like Ultraman with his hands up and sticking out the window.

  To be honest, this posture is a bit scary, as if it is about to launch into the space at any time.

  At the same time, Bai Zhen moved to an amateur radio station, Icom705 that he borrowed from someone.

  Bai Zhen brought a folding table downstairs, set it up on the lawn of the community, and was driven out by the security guard.

  He changed a place, set up a table on the side road, set up the Icom705 amateur digital radio station, set up the antenna, and attracted the security guard. He spent a long time arguing with the community security.

  The new security guard thinks that the middle-aged man looks suspicious, his equipment is suspicious, and his credentials are suspicious.

  Bai Zhen asked if you don’t know what HAM is? I am HAM.

  The security said that if you are a toad, please go back to the pool.

  Bai Zhen holds the UV5R console in his hand, Icom705 is placed on the table, and the antenna is erected by his side. He is responsible for testing the remote control system in the command post.

  The following signal links will be formed between these devices:

  When testing the reception, Bai Zhen used UV5R to send the message outside, and the signal was received by the GR3188 repeater station, and the receiver of the repeater station transmitted the signal to Icom725.

   During the test transmission, Wang Ning used the Icom725 in the room to send the signal, and the Icom725 transmitted the signal to the GR3188 repeater. The transmitter of the repeater sent the signal to Bai Zhen, and Bai Zhen’s Icom705 amateur station was responsible for receiving it.

  If there is no problem with sending and receiving, then BG4MSR can copy a set of exactly the same system as it is.

  Because of the serious shortage of manpower, Wang Ning and Bai Zhen can only be used by one person. Bai Zhen brought the hand stage downstairs and moved the distance apart, while Wang Ning was wearing headphones to listen to the signal, and at the same time supporting the antenna to act as a human body.

  "Attention, pay attention to all departments." Bai Zhen pressed the PTT button of UV5R, "Reverse the future to save the world. Amateur radio emergency command, the sixth experiment of remote control system, now begins!"

  (End of this chapter)