Xu Ke shook his head and waved his hand, "Classmate Jiang, I may not be clear enough." I'll be blunt. I mean, if I make a walkie-talkie, it will cost me 50000 yuan, and it will cost 5,000 or even 50,000 yuan to realize my dream. In short, it won't be a small amount. "Exactly, it's not a figure that an individual can afford.

Jiang Shiyue nodded, "I know." You just let go and research, and I'll figure out how to deal with money. ”

Xu Ke looked at Jiang Shiyue, who had an indifferent face, opened his mouth, and closed it again without knowing what to say.

I wondered if Jiang Shiyue didn't know what the concept of 10,000 yuan was?

This year, 10,000 yuan is going to be in the newspaper.

Moreover, 50,000 is just an analogy for him, and it may not be enough to achieve 500,000.

"I'll talk to you about the details of the cooperation when I go back to school tomorrow." Jiang Shiyue motioned to the food on the table just now, "Eat first." ”

Xu Ke was in the mood to eat, and said hurriedly: "Classmate Jiang, you may think about this matter too simply!" What I want to do is compared to this walkie-talkie like an adult is compared to a baby, and it is not difficult at all.

How so? What I want to do is very similar to the principle of the walkie-talkie. But ......"

Xu Ke had a bitter face, and he didn't know how to describe it to Jiang Shiyue at all, and he didn't know why Jiang Shiyue believed so much that he could make a tool for real-time long-distance calls.

Even she is more persistent than herself.

Jiang Shiyue saw that Xu Ke was so anxious that she couldn't speak, so she stretched out her hand and made a gesture of pressing down in the air, "Classmate Xu Ke, don't worry, I know what the difficulty is." ”

Xu Ke was stunned.

"You're right, walkie-talkies and cell phones...... I mean a tool for real-time long-distance calls, let's call it a mobile phone for the time being, which means a walkie-talkie in your hand. The biggest difference between the two is in the way they communicate. Walkie-talkies do not have high requirements for encryption, and they are short-distance transmissions.

For example, this walkie-talkie is borrowed from the academy radio channel, and it can be used within a kilometer diameter of the academy at most. If there are other people who happen to have a walkie-talkie, they can also happen to be in this channel, and they can hear it and talk to us in real time.

What mobile phones want to do is ultra-long-distance calls, just like ordinary wired phones, which require many, many stations. Just replacing a wired site with a wireless site is like establishing a separate radio channel across the country, and it also has to realize one-to-one calls between mobile phones, unlike walkie-talkies, which can be one-to-many. ”

Xu Ke nodded again and again, "Yes, that's what you said." The general principle is that we can say what we say...... Well, the mobile phone becomes an encrypted radio signal, which is converted into sound when it arrives at the terminal. It's not hard to say, but if you want to build a site, ......"

Xu Ke spread his hands and smiled bitterly, "This has to be a national-level project, we definitely can't do it." ”

They are all students, how can they have the capital to build national projects?!

Jiang Shiyue nodded, "I know it's not easy, take your time, we can first realize the close range of speech into encrypted radio waves and then into sound, or realize the conversion of text to radio waves and then to text." ”

"That's right! How did I not think of that?! Xu Ke suddenly became interested, and felt that this function could still be done.

Jiang Shiyue smiled.

Although she doesn't know how to make mobile phones, she understands the general principle. I also know that the mode of signal transmission from Big Brother to mobile phone has been changing, the earliest Big Brother is analog signal, and then digital signal transmission is a mobile phone used daily.

Big Brother only existed in the early 90s, and it is understandable how difficult it is to make mobile phones come out ten years in advance. She was mentally prepared.

Xu Ke had an appetite and began to gobble it up.

He hadn't eaten in two more days, and he was really hungry when he smelled the fragrant food.

"I don't know how to make a mobile phone, but I have an idea, and you can see if I can make it happen. As you said, it is unrealistic to build a base station to the whole country with our strength. There are two ways, one is to cooperate with the state and borrow the country's telecommunications. The second is to lease the right to use satellites and use them as radio base stations to achieve long-distance real-time calls around the world. ”

Xu Ke choked, his face flushed.

Li Xiaoyan quickly poured a cup of tea and handed it to Xu Ke.

Xu Ke poured a lot of anger, and finally recovered, his eyes were red, and he complained to Jiang Shiyue, "Classmate Jiang, I finally understand why everyone doesn't believe that I can make a mobile phone, but you firmly believe that I can." Because you dare to think more than I do. ”

Rent a satellite?

He couldn't even think about it.

Jiang Shiyue smiled and didn't speak.

At present, the country's communications are still far behind the world level, and I am afraid that the function of mobile phones will not be realized for a while, but artificial satellites are already available.

Our country is the fifth country in the world to independently develop and launch a satellite, and the first artificial satellite was successfully launched in 70 years, but it was lost in less than a month.

And in 78 we already had terrestrial satellite communication base stations.

Of course, whether it's a radio base station or a rental satellite, you need money.

And Jiang Shiyue can only be regarded as a 10,000-yuan household at present, and she is still far from being rich.

"Anyway, Mr. Jiang." Xu Ke hiccuped and asked the confusion in his heart, "Why do you know so much radio stuff?" Moreover, why do you say that you are a light engineering major? ”

Jiang Shiyue shook her head, "Where do I understand radio?" It's just that the master I met when I went to the countryside likes to say that I just listened to it. As for light engineering, it is compared with heavy industrial engineering. ”

Normal light engineering generally refers to related professions such as packaging technology, cosmetics, flavors, etc.

Jiang Shiyue's talk about light engineering is related to computers, and it is designed to be a high-tech project in the future.

But in this era, the most popular majors like their school are mechanical and electrical related majors.

This is because our country is far behind the world level in heavy industry at the present stage, and the workers are often unable to complete production in a hurry day and night.

Factory equipment is often outdated.

Therefore, what their classmates learned the most was to design and repair various production equipment for the workshop.

Xu Ke's major is not unpopular but not popular, Jiang Shiyue's major is very unpopular, so she always says that she is a radio major.

She has not yet opened a separate department for her major.

Just like computers, many colleges and universities are classified as mathematics departments.

Li Xiao interjected enviously, "You college students are so good!" ”

She couldn't understand what Jiang Shiyue said to Xu Ke at all.

"You can work hard to go to college, too!" Jiang Shiyue smiled at Li and said, "Instead of envying others, it is better to improve yourself." ”

"Me?" Li Xiao turned his index finger and pointed at himself and shook his head, "I'll graduate from elementary school!" I can't go to junior high school anymore when I'm an adult, right? ”

"It's never too late to start learning. If you can't go to school, you can study on your own or go to night school. If you do it first, you will know if you can do it. Jiang Shiyue encouraged Li Xiao.

Before Li Xiao could speak, Xu Ke rushed first: "You're right, you have to do it first to know if you can do it!" Then let's make a mobile phone together! ”