The responsibilities of the test flight institute are many, in addition to finalizing and testing flights of various fighters, it also undertakes the role of pre-research of advanced technology.

For example, the operating system of a fighter.

Fly-by-wire systems are an inevitable trend, so who will develop this system?

Is there an aircraft design institute?

This kind of pressure is very great, and if it is developed by the test flight institute, the results of the development can be shared with all designs, which greatly facilitates the research and development of fighters.

At the same time, the main thing developed by the test flight institute is the hardware equipment of the fly-by-wire operating system, and the biggest difficulty in installing the fly-by-wire operating system on fighter planes is the writing of its programs, and it is necessary to be familiar with the flight control rate of its own aircraft in order to be able to write qualified programs; otherwise, this kind of system will be much more dangerous than that of hydraulic operation.

Historically, the third-generation aircraft of many countries have crashed in the development of aircraft, precisely because of the problem with this control rate.

The control rate, the design institute does its own work, and the overall hardware is carried out by the test flight institute, even so, the test flight institute has to overcome great difficulties, because after all, there is no information to refer to.

There are introductions to the telex operating system in foreign countries, but it is only an introduction, and if you want to rely on the introduction in the magazine to make it out, it is a fool's dream.

What circuits are needed inside, how to connect, how to encode data, how to decode, how to deal with unexpected situations, and so on.

Qin Feng, led by Wang Yang, walked into the building behind the test flight institute, which is where technicians engage in scientific research.

"Jin Hai, are you still busy?" Wang Yang pushed open a door and shouted to the people inside.

The man called Jin Hai was very tall, but relatively thin, with thick spectacle lenses on the bridge of his nose, like the bottom of a beer bottle, and he looked to be less than forty years old, but his head was already bald, and it was bare.

He saw Wang Yang, and his face was also happy: "Old classmate, are you free today?" ”

Zhou Jinhai, after graduation, came to the test flight institute, and worked here for more than ten years, and now, he stood up and greeted Wang Yang and Qin Feng, his face was very happy.

"Drink water? I'll pour you some water. Zhou Jinhai said.

"No, no." As Wang Yang spoke, he saw that Zhou Jinhai had already stood up, and at this time, Qin Feng also saw a book that the old designer was studying in front of him.

Fundamentals of Digital Circuits.

When he saw this book, Qin Feng was immediately shocked in his heart, this should be the foundation that a technician should master, Wang Yang said that this Comrade Jin Hai should be the person in charge of this stabilization machine, although the project has not yet been established, it is also in the early preparations.

Who would have thought that he had just started learning digital circuits?

It's like going to a hotel and asking for a kung pao chicken, but what happened? The chicken doesn't have it, the eggs are getting ready to hatch the chicks, and this will have to wait until the Year of the Monkey?

While speaking, Zhou Jinhai came over with two enamel cups, with the words "serving the people" printed in bright red, Qin Feng held the cups, but his eyes continued to look at the book.

Following Qin Feng's direction, Zhou Jinhai saw his book, and he also felt embarrassed: "Those of us, when we went to school, we all learned analog circuits, and we have to learn digital circuits from scratch. ”

That's right, the older generation of technicians has never been in contact with digital circuits, and now the 204 radar equipped on their own J-8 fighters has not been able to break through the technology for a long time, just because it is still analog, not that everyone does not want to engage in digital, but it is not clear at all the principle of digital pulse Doppler radar, and there is no way to start.

The gap is huge.

Zhou Jinhai knew his gap, and he learned very seriously, and a piece of scratch paper next to him was full of dense 0s and 1s, which seemed to be converting various gate circuits.

"My little brother, Qin Feng, is the youngest and best test pilot in our test flight academy, I guess I can't wait for your stability machine, he must be fine." Wang Yang said: "Today we are talking about digital telex, so I will take him over to have a look." ”

Hearing Qin Feng's name, Zhou Jinhai's eyes also lit up: "I heard that your theoretical knowledge is very solid, come, explain to me." ”

As he spoke, he took the book: "Explain to me how the current flows in this circuit, I don't understand." ”

"Jin Hai, you will seize the opportunity and ask without shame." Wang Yang said.

"Where I ask down, I ask if it's good, whoever has more knowledge than me, I will worship whoever is a teacher." Jin Hai pushed his glasses and said to Qin Feng.

Qin Feng didn't look at the specific circuit diagram, but pointed out the key in one sentence: "In the analog circuit, we have to look at the flow direction of the current, in the digital circuit, we don't care about how the current flows, what we care about is its signal transmission, the front is 0, the back is 1, eight digits, how to move left, right, if you look at the current, it is a layman." ”

"Don't look at the current?"

"Of course." Qin Feng said: "In it, don't call it current, what you are looking for is high level and low level, high level means 1, low level represents 0, that's all, such as this circuit, it should be an adder, right?" Find the input, find the output, and then see how the numbers add up, that's the right way to do it. ”

It is difficult to accept this point of view, and after more than ten minutes, Jin Hai finally nodded: "I seem to understand, I only look at what functions I need, how these signals need to change, just find the corresponding circuit, and don't care about the current!" ”

Qin Feng gave a thumbs up, yes, his comprehension was very correct.

After asking again for more than an hour, Qin Feng explained in turn, seeing that he was about to leave, Wang Yang on the side finally said: "Jin Hai, let's come to see the progress of the stabilization machine, if it's not a confidential project, you tell Qin Feng, this kid has a flexible brain, maybe he will give us a good idea." ”

In the test flight of the J-8, Qin Feng has solved several problems, and today he even refuted the academic authority Lao Wang, and everyone admires Qin Feng quite a lot.

"If you are interested, I will tell you that the state has not yet established the project, it is not a confidential project, our plan, in fact, began in 1976, and in the past few years, I have been in charge, and I will not report it and apply for the project after forming a perfect idea."

Seeing that this old man had just started to learn digital circuits, Qin Feng was also anxious.