"We've got more time." After the meeting from the capital, I returned to the factory, and there was only one thing left, that is, to make the plan of this Jian-7 CP, Qin Feng was also busy, and this time was in a blink of an eye, and it was the end of 1984, everyone was looking forward to January 1985, and the Pakistani side continued to meet, and finally, got a good news.

The Pakistani side is going to postpone!

"General Jamal went to the United States, it should be to discuss the purchase of the F404 engine in the United States, as long as they can help us solve the engine problem, other aspects, we can talk about it." Tu Lao said: "Moreover, they have already brought us the radar data, and now, let's discuss how we should choose the radar." ”

Originally, he was scheduled to meet with the Pakistani side in January, but now that he has a lot of time, Tu Lao also breathed a sigh of relief.

A fighter, mainly divided into three parts, the fuselage, engine and avionics, this aircraft is a model of overhaul, the nose should be changed to a scheme of air intake on both sides, so that the nose can be vacated to install a large-caliber radar.

The specific model of the radar has a great impact on the development of the aircraft, and it is necessary to consider only the weight of the radar, which is one aspect, and the impact of different weights on the center of gravity of the aircraft is different, which must be determined first. Now it has been overhauled, and the weight of the nose is more of a key issue.

On this issue, the Su-27 series aircraft has the biggest heel.

It was originally planned to go to the flat slot radar, but what was the result? The Soviets couldn't get the technology out, and they were forced to move the MiG-29 radar up, which directly led to the weight gain of the system, which was originally planned to be done by 500 kilograms, but the huge N001 radar weighed a ton of weight, and now, the plane was overweight, so it was necessary to lose weight, and the weight was reduced to the end, and even directly punched holes in the girder, which caused the hypochondria of the aircraft, and as a result, it was not overcome until the Su-35, if the Soviets had an advanced flat slot radar at that time, they would never have taken such a big detour.

Think about it in this era, everyone is still working on the 208 radar, and it can't be solved, and now, this foreign trade aircraft of our own side has a world-class radar to assemble.

"The information provided to us by the Pakistani side is very simple, just a little more than the information published by the outside world," Tu Lao continued: "Relying on these information, we can deduce a rough idea, which is enough for us to design the aircraft." ”

The information is just a piece of paper, that's right, a radar is a piece of paper, which only roughly states the volume, weight, power, etc., as long as it is set aside.

Although in the original concept, it must be assembled by oneself, those advanced engines and avionics, should be able to fall into the hands of the 132 factory, everyone will have the opportunity to disassemble and study, but, in fact, when the project goes to the later stage, there will be a lot of uncertainty, so, Tu Lao took the information, there are all kinds of feelings in his heart, he looked at everyone: "Now, let's have a general understanding first, see which radar is more suitable for us, and then we will determine with the Pakistani side." ”

Qin Feng also took a copy, anyway, it was just a few pieces of paper, but holding these pieces of paper, he looked at it very seriously.

Three radars, the first one, is APG-66, this radar, is a radar for F-16 fighters, anyway, Pakistan already has F-16, so importing such a radar and equipping it on their modified J-7 is not a leak, it belongs to what they can get.

For this radar, all kinds of basic data are marked below, and the antenna size is 74 by 48 cm.

It is generally thought that the radar antenna is circular, and the current domestic pot lid radar is indeed circular, but the radar in the United States has already used a flat slit radar antenna, which does not necessarily have to be circular, especially the F-16, the nose is flat, so its radar is also an elliptical transmitting antenna.

This kind of antenna is relatively large and cannot be fitted into the nose of its own side, after all, its own fighter must be round, and a diameter of about 60 cm is a more suitable solution.

It's a pity that this radar is not good, it is not suitable in terms of size, and it does not have a continuous wave irradiator, so it cannot guide medium-range Sparrow missiles, and for Pakistan, it is obvious that there is definitely a requirement for medium-range interception.

Qin Feng stared at the data and looked at it three times over and over again before putting it down and looking at the second one.

APG-69. This is the second radar.

It's not that the later the model, the more advanced the performance, otherwise, the J-13 is also more advanced than the J-10, and the naming of the model has a history.

Although this radar is called 69, it is much behind the one codenamed 66.

The antenna of the radar is 48 cm, which is just right! However, the processor and other systems of the radar are backward, and this radar is used on the F-5 fighter.

The F-5 fighter is a best-selling model of Northrop, this model is completely exported, the US Air Force is not equipped, it is completely exported, but it has opened up a good sales channel and has become a best-selling model in the international market.

However, the radar of this aircraft is only an improvement of the previous radar.

Initially, the AN/APQ-153 was used, which was the simplest ranging radar. Later, an improved version of the AN / APQ-159 radar was developed. By changing the antenna to a slit plate antenna, the clutter suppression is carried out by using frequency agility, which greatly expands the ranging capability and realizes off-axis interception and tracking.

This is the advanced technology of the United States, even if it is a backward radar, if nothing else is changed, just changing the antenna can bring about a radical change.

Later, they squeezed toothpaste and continued to improve this APQ-159, which became the current AN/APG-69 radar, which can only be said to be sufficient, and the performance is very poor, and Pakistan will not take a fancy to it.

Therefore, only the last one remains, APG-67, this radar, is used on the F-20, F-20, which is a modification of the F-5 fighter, and the two turbojet engines in the tail are replaced by an F404 engine, which is about the same size as his own J-7, and in order to improve his performance, the latest radar is also used, which is this APG-67.

This radar is newly developed, using the latest design ideas from the United States, such as the use of modular hardware, and the standard 3/4ATR circuit board is generally used. Use standard power supplies and MIL-STD1553B compliant digital buses, control interfaces with microprocessors, and more.

Even now, this kind of radar is still under development, and it has not yet been completely finalized, except that the caliber is not as good as the APG-66, its performance is good in all aspects, especially the most important thing in air combat, what is the function of scanning and tracking at the same time, etc., and even equipped with a continuous wave irradiation function, which perfectly guides the Sparrow missile.

Needless to say? Of the three, it must be the latest radar, which is said to be finalized until 1985!

"Tu Lao, through this project, we have come into contact with the world's advanced level, and we must feed back to our domestic technology, which is the best." Qin Feng couldn't help but come up with this idea.