Go back to the prosperous days and become a layman

Chapter 69 Two Problems
Perhaps due to the inconvenience of communication, people have a relatively high tolerance for delays in information, and generally do not feel anxious if they do not respond to calls or WeChat messages for half an hour.

After Tang Zhitong went to work, he wrote a letter to classmate Xiao Wang, telling her the good news that he had obtained the title of chef, and wrote that he would give her a new dish to try when they meet on the weekend.

The closer to the Spring Festival, the busier the postmen are, and the parcels are full every day.Tang Zhitong hurriedly filled in a few bites of lunch, immediately packed up the parcel and started the second round of delivery.

Because Tang Zhitong had to go to the Telecommunications College today, he didn't have any time to chat with the crowd. After investing in this company, he immediately rushed home.

In the cold weather, Tang Zhitong's forehead was still sweating, and he was pedaling so fast. He wished he was Nezha, stepping on a hot wheel, with three heads and six arms.

The Institute of Telecommunications is outside Xinjiekou. Tang Zhitong had to cross most of the city to get to the Institute of Telecommunications.By the time I arrived at the Telecommunications College, classes had already started.

Tang Zhitong raised his hand and looked at his watch. Fortunately, it was only 5 minutes late.

Teacher Zhou is also considered a person in the postal and telecommunications system. He knows the identity of Tang Zhitong's courier. Seeing his sweating face, he knows that the courier has been very busy recently. He nodded and let Tang Zhitong enter the classroom and continued his lecture.

There are no fixed seats in amateur technical secondary schools, and the vast majority of students cherish the opportunity to learn, so Tang Zhitong can only sit in the back.

This class is about the principles of telephone calls. Teacher Zhou explained it in detail. He even took out some components of a stepper switch and pointed at it to tell everyone how to operate it.

"Students, have you ever made a call? The waiting time is long, the noise is loud, and the call quality is poor. Why?" Teacher Zhou pointed to the step switch components on the table and said, "That's why the step switch transfer The speed is slow, the parts are easy to wear, and the noise is loud.”

Tang Zhitong listened with great interest. He had personal experience with what Teacher Zhou said, and it also reminded him of the plots of some movies and TV series.

When the big shot picked up the phone, he spoke very loudly, not because he was angry or urgent, but because the call quality was not good. You didn't expect that, right?
A very small detail can tell whether the shrimp chicken bar has been made up randomly.

"Nowadays, the world has gradually adopted vertical and horizontal telephone switches. Our step-type switches have not yet become popular. Students, the gap is very big. We have to catch up!" Teacher Zhou held up his glasses and continued: "We The country is also studying vertical and horizontal telephone exchanges, and I am also involved, but the call quality is not satisfactory and it has not been successful yet."

"The administrator said: The people, and only the people, are the driving force for creating world history." Teacher Zhou raised his head and glanced at the students, "Talking about vertical and horizontal telephone exchanges is a bit out of line, but the reason why I talk about it today is because I want to Let everyone think more at work, maybe one of your inadvertent discoveries can promote historical progress."

After finishing speaking, Teacher Zhou turned around and drew vertical and horizontal lines on black and white without any objects, and abstractly talked about the working principles and advantages of vertical and horizontal telephone exchanges.

When he heard Teacher Zhou say that the vertical and horizontal telephone exchange was connected through contacts, Tang Zhitong was thoughtful, as if he had heard this somewhere.

After class, Teacher Zhou withdrew, and the students walked out of the classroom in twos and threes.

Delivery workers have a hidden benefit: they can browse some newspapers waiting for delivery at the branch, as long as they don't mess them up.

Tang Zhitong has been busy delivering goods recently and has not bothered to read newspapers. The newspaper reading column on campus has changed to a new newspaper, so he stood in front of the newspaper reading column and browsed the current news.

The headlines are about anti-American demonstrations in Cuba, and most of the other news is related to the fight for independence, demonstrations, and protests.Well, there are advertisements in newspapers, can you believe it?When Tang Zhitong saw a piece of news on the third page of "Large Copper and Aluminum Training", he finally remembered where he had heard the familiar words.

A lecture was organized in the university, and the speaker was a senior figure in the materials department.

The boss said at the time that the delay in building an aircraft carrier was not only due to financial factors, but also to material factors. Domestic materials started late, and many of them could not be built.

At that time, the boss encouraged the students present to pay attention to materials and actively participate in material innovation, saying that they should not feel too far away from themselves. Materials are not only related to national defense, but also closely related to personal life.

In order to prove what he said, the boss mentioned the phone call and asked the audience if they knew how to improve the call quality?

The audience below had different opinions.

The boss revealed the answer: it’s a switch.

When we first started to imitate switches in China, we really couldn't make contacts made of the same materials as those in foreign countries. We had no choice but to try the existing materials one by one. In the end, we found that only precious metals could be used, but due to the cost, they were not widely used.So until new materials are developed, the call quality is not very good.

With the guess in mind, Tang Zhitong returned to the office to find Teacher Zhou: "Hello, Teacher Zhou."

"It's Xiao Tang, what's the matter?" Teacher Zhou raised his head, adjusted his glasses, and asked after focusing.

"When I listened to you talking about the advantages and disadvantages of the two types of switches today, I thought of one thing, but I couldn't hold it, so I didn't say it in class." Tang Zhitong certainly can't say that it was said by a big shot in the Department of Materials. I don’t know where it is yet. Besides, the material started late, which means that there is no corresponding university department. If I rashly propose it, I will be suspected of being an enemy or special.

"What did you think of?" Teacher Zhou became interested. In order to control the telephone exchange, many people tried their best, including himself.

"When I first started working, I passed by Dongsi once, and there were a few children arguing about the mineral radio. Do you know about the mineral radio?" There were children playing with it in Tang Zhitong Hutong. There was a mineral radio that was amazing. I can show it off for several months, but I'm not willing to let anyone else hear it.

"I know, it's a passive radio without an amplification circuit that uses ore as a detector." Teacher Zhou nodded and explained seriously.

"Hey, I don't understand either. At that time, a child held up his own mineral radio and proudly told other children that the signal and sound quality were better with silver wire. He also said that he stole his own silver wire and went to find someone to fix it. I have tested it myself. Today you said that one of the two switches has loud noise and the other has low noise. I just remembered this. Is it caused by a material problem? I don’t know if this is reliable or not. I tell you, I don’t feel at ease. I don’t know if it’s reliable, I have to rely on you to verify it.” Seeing Teacher Zhou’s serious look, Tang Zhitong really couldn’t bear to make up lies, but he couldn’t explain himself if he didn’t make up lies, so After saying that, he was about to leave.

"Okay, I understand." Teacher Zhou never thought that Tang Zhitong would deceive him, but seriously considered the possibility.

　This book is not that violent, and there will definitely be bugs. Although I checked the information, what I found was limited.All I can say is that I will try my best to write it well.

　　Although the updates are a little less, you still need to ask for votes. There is only one day left for the double monthly pass.

　　Finally, I want to ask, what kind of speed do you guys like?
　　
　
(End of this chapter)