The operation of the J-8 is slightly cumbersome, especially its rolling, which is the most important thing to pay attention to.

The reason is simple, it is based on the J-7 and is stuffed with two engines, and at the same time the fuselage is lengthened, so that the strength of the fuselage is not enough.

The most common F-16 in the third-generation aircraft is designed to overload 9G, and this J-8, the overload when rolling does not even dare to pull to 5G, otherwise the fuselage may be cut into two from the air.

Pedaling the rudder and pushing the operating stick, the J-8 drew a large circle in the sky, Qin Feng looked into the distance, and he had already seen the airport runway in the distance while rolling.

By this time, he had become completely familiar with the airspace.

The J-8 fighter flew gently in the air, aimed at the runway, and landed steadily, Qin Feng's first landing was also a full score.

The wheels touched the ground, the parachute was released, and when the plane came to a standstill, Qin Feng saw several people pounce on him.

Leader Zhu of the 204 Radar Overall Group, he was of medium stature, his face was round, and his eyes were full of concern, and now, as soon as Qin Feng climbed off the plane, his voice had already come: "What's the matter?" In our previous experiments, this didn't happen. ”

In March 1966, the airborne interception and targeting radar 204 radar designed and developed by China was launched. At that time, Team Leader Zhu was working in a big city, but he resolutely came to Neijiang, Sichuan, and took root in the 607 Institute on the mountain, and participated in the development of this radar together.

The 204 interception targeting radar, single-pulse system, X-band, in the development of scientific research personnel have no experience, can only learn while scientific research and application.

By the beginning of 1967, the first performance prototype began joint testing. However, in the context of the great era, the development and test work of the 204 radar came to a standstill. Even, there is a possibility that the results will be destroyed.

During this period, he guarded this radar, guarded the machinery and equipment, and continued to study the business, for him, this radar is like his own child.

After many hardships, finally, this radar was installed on the J-8 fighter for the most important carrier flight test.

The radar screen is full of snowflakes, which means that it has been interfered with!

Where did this interference come about?

"When I turned on the radar, the beam started to show normal on the screen, but after half a turn, the beam was full of bright spots." Qin Feng said.

The test pilot's description is quite important, and it can give first-hand feedback to the scientific research staff, and when he heard Qin Feng say this, Team Leader Zhu's face was puzzled: "Strange, it started well, and then suddenly it didn't work?" ”

He said to himself: "Could it be that the circuit heats up after it works, causing the feedback confusion?" This is complicated if you disassemble the circuit. ”

If it is a Western fighter, it has now adopted the insert type, open the skin on the side or the specially opened hatch, and the circuit board inside is a piece, and it is quite convenient to plug and unplug.

However, your own fighters are stacked, and if you want to dismantle the lower ones, you have to remove the upper ones in turn.

Such a dismantling can easily take hours, or even days.

"Let's take a look at the radar antenna first." Team Leader Zhu said.

With his words, several technicians have already begun to attack the nose of the machine.

The structure of the J-8 fighter is similar to that of the J-7, the nose air intake, in order to adjust the air intake efficiency at various speeds, it is necessary to add an adjusting cone in the center of the nose, and the adjusted air intake cone moves back and forth to control the size of the air intake.

When I first went to Egypt, I saw that the MiG-21MF had quite a large air intake cone, but compared with the J-8 in front of me, it was a small thing.

Its diameter is at least half that of the MiG-21MF, and the huge dark green air intake cone is bolted to the base at the back.

Several people worked together, and after ten minutes, the cover of this air intake cone was removed, and Qin Feng stood behind them, looking at the radar antenna inside.

From the outside, it looks like a pot lid, yes, this is the form in which the radar antenna was originally developed, its front end is a small reflective surface, which has a feed inside, and then reflects to the main parabola behind it, radiating forward, this is the Cassegrain antenna, and it is also the most commonly used form since the development of radar technology.

As for its efficiency, that's pretty low.

In this era, the West has begun to transition to flat slot radar antennas, but unfortunately, that kind of technology, it is enough for you to think about it yourself.

Qin Feng couldn't help but sigh in the back, he didn't know now that in a few years, he would participate in a peaceful model project with everyone, although it was a failed project, everyone came into contact with the advanced airborne radar technology in the Western world, and since then they have worked hard to continue to dedicate themselves to the cause of airborne radar for their country.

"There is no problem, our radar antenna is completely normal, and there is no abnormality due to vibration." An assistant said to Team Leader Zhu: "Maybe the problem is in the circuit, why don't we disassemble the circuit?" ”

It is easy to dismantle the radar antenna, just remove the air intake cone, but if you dismantle the circuit, it is a big project, and after removing it, it will be even more cumbersome to test the circuit.

Team Leader Zhu frowned.

He has been involved in this project for more than ten years, and has grown from a young man to a leader in charge of his own business, and gray hair has begun to appear on his forehead.

He is very confident in his radar, the circuit boards are all newly built from the factory, how can there be a problem?

At this moment, Qin Feng suddenly said beside him, "Is it the interference of clutter on the ground?" ”

Qin Feng has always been studying fighters and new technologies in this era, and now, foreign fighters have long developed to pulse Doppler radar, using Doppler technology to filter out clutter through continuous Fourier changes, and have the ability to look down and shoot down.

And these technologies are too advanced for their own side, this 204 radar is still the most common single-pulse radar, only able to search the sky.

At that time, the flight altitude was only 2,000 meters, and according to the depression angle and altitude of the radar antenna, there would definitely be radar waves radiating to the ground, so that the radar would be strongly interfered with by the ground, so that the screen was full of snowflakes.

Hearing Qin Feng say this, Suddenly, Team Leader Zhu patted his thigh: "That's right, our radar is no problem, but if it is combined with the carrier aircraft, there will be a problem!" ”

"Comrade Qin Feng, you really have you, this analysis of yours is very reasonable!" After Team Leader Zhu finished speaking, he frowned again: "It's just that, how can we solve this problem?" ”