In the J-6 era, the method of measuring the wingspan was used to measure the range, and by the J-7, there was finally a radar rangefinder.

Among them, the J-7 and J-7I aircraft are equipped with the Type 222 radar rangefinder, which is made of imitation of the Soviet СРД-5МК radar rangefinder, with a maximum ranging distance of 5~7 km. The radar rangefinder has two working states, and the lobe of the wave emitted by the radar rangefinder is wider and the detection distance is closer when the cannon is fired. In the missile launch state, the lobe of the wave emitted by the radar rangefinder is narrow, and the detection range is far.

On the J-7II, the Type 226 radar rangefinder installed is not much different from the Type 222 in overall performance.

Now, the introduction of pulse Doppler radar has been delayed for the time being, so this matching "Air Patrol" 7M radar rangefinder was first introduced.

At present, the information provided by the British side has been relatively detailed, and this radar rangefinder adopts relatively advanced technologies such as composite fixed antennas, two beam widths, and frequency agility, which can adapt to the needs of using different weapons, so that its performance in firing cannons and launching missiles and rockets is better, and it also has better anti-jamming capabilities.

The beam width used for cannon firing and firing rockets is 18 degrees, and the range is 300~3,000 meters. The beam width used when the missile is launched is 6 degrees, and the range of action is 450~19,500 meters.

These indicators are all very detailed, and it is said that there is nothing wrong with them, but Qin Feng knows that there are traps in them, or rather, there will be places to fight in the future.

Hearing Qin Feng's words, Tu Lao also immediately came to his senses: "That's right, our radar rangefinder is installed in our radome, this indicator is after passing the radome, or there is no radome, it must be made clear!" ”

The radome has a hindering effect on electromagnetic waves, and some radars will even reduce their performance by 30% after installing the radome!

You can't blindly trust foreign products, what if something goes wrong?

"Also, our radome is shrunk inside, and there may be electromagnetic interference, which must also be made clear." Qin Feng continued.

If the radome is retracted into the air intake, the radar may be affected by the air inlet and produce false interception, who is responsible for this? When the time comes, as soon as the British resign to their side, they will pass, but if the technical problems are not solved, it will be useless for them to bring in!

It had to be made clear that once the radar had this kind of problem, it would have to be solved by their Marconi people.

The two points that Qin Feng mentioned were not expected by everyone, and now, looking at the opinions that Qin Feng picked out, everyone was secretly happy in their hearts, fortunately Qin Feng came, everyone could think more thoughtfully.

What are Qin Feng's advantages?

He is a test pilot himself, and he is very clear about the use of fire control of the aircraft, and at the same time, he is also proficient in English and can directly understand the original text, especially if he is also familiar with the advanced aviation technology of this era, and is used to using his brain, in this case, Qin Feng's advice is more valuable.

"This little comrade is good, Lao Tu, let's ask him to come and join our negotiation team, how about it?" At this moment, Sun Lao, deputy general manager of China Aviation Technology and mainly responsible for negotiating with the British, said.

With Qin Feng joining, of course it would be great.

Qin Feng's heart moved when he heard this, but Qin Feng still shook his head: "I'm sorry, I promised Gu Lao to help them complete the test flight of the J-8, I only came here for three days." ”

After speaking, Qin Feng took out a red cloth from his artificial leather handbag, opened the red cloth, and revealed a piece of paper inside, which was full of flowers and green, and it looked like a passbook.

"Tu Lao, this is my bonus, I want to hand it over to the 611 Institute, where the comrades are developing new projects, and funds are tight, these can be regarded as my meager efforts."

Five thousand yuan, a huge amount of money in this era, but Qin Feng took it out at this time!

Everyone was a little surprised.

Tu Lao didn't know whether to take it or not, if he was Lao Song, he wouldn't want it, this is Qin Feng's own money, he hasn't married yet, he hasn't married a daughter-in-law, he has children, and there are many places to spend money in the future, so he easily got a bonus, so he used his bonus, is it appropriate?

However, the embarrassment of the 611 Institute, Tu Lao also knows, their research institute is about to be unable to open the pot, and many comrades in the institute have to do something after work to subsidize the research in the institute.

Moreover, the prospects of the J-9 project are not good, if this project is gone, then the 611 Institute will have a bleak future.

"Qin Feng, you should keep this passbook of yours first, and wait for you to hand it over to Lao Song in person." Tu Lao said.

"Nope." Qin Feng was anxious: "Old Tu, my test flight task is very tight, and I don't have time to go back to Chengdu, can't I ask you to do this?" Then I had to send the money. ”

"Okay, okay, then I'll take it first, but if Lao Song doesn't accept it, don't be embarrassed for me, you can take it back." Tu Lao said.

When the other leaders saw Qin Feng doing this, they all sighed repeatedly, Qin Feng is really a good comrade who is willing to help!

"By the way, you can come with us for tomorrow's meeting." Tu Lao said.

Qin Feng nodded, he went abroad twice, and he had dealt with the Egyptians and the French, but he had never seen the British.

"Okay, let's talk about one more issue, it's time to discuss it tomorrow." Tu Lao said: "Who is responsible for the modification of our aircraft. ”

This is a key national project, through the introduction of Western avionics equipment installed on its own fighters, so that its own fighters have been reborn.

However, this requires a specific action.

One option is to take the equipment of the Marconi company, install it by itself, debug it by itself, and test fly it by itself, and the other is to hand over the aircraft to the Marconi company, and the Marconi company will find an aircraft company to cooperate with in the UK.

The J-7 project is the first type, and the later J-8 peace model is the second type, which flies the fighter to the United States for modification, and as a result, everyone knows the result.

Now, hearing what Tu Lao said, Qin Feng immediately couldn't help but interject: "Needless to say, of course we did it ourselves!" ”

Is there a question about this? Qin Feng felt that this was taken for granted.

"Comrade Qin Feng, what you said is light, this is our key project, the superiors are urging very tightly, we are now, most of the comrades in China don't even understand a digital circuit, how long will it take to understand these technologies? We can't afford to delay. ”

Domestic technology is outdated, the experience of a long time, now, the domestic technology is far behind the foreign countries, everyone is looking forward to improving as soon as possible, this progress is delayed, no one can afford it.