It turned out that Bai Shujie scrutinized (it must not be called research, at most it is a copycat) airborne (shipborn) radar, and encountered two biggest problems: first, what antenna to use, what form of scanning mode and analysis mode; Second, how far it needs to be detected.

For the first problem, the only way to choose the antenna scanning method is mechanical scanning, that is, the antenna is constantly rotating.

Bai Shujie tried his best, and finally decided to use the "Yagi antenna", and it was more reliable to use the things invented by the little devils to fight the little devils.

If you want to scan 360 degrees, Bai Shujie's current "road processing factory" is not very reliable. If you want to tell what the signal is, an antenna is not enough.

In the end, Bai Shujie decided to use two antennas, which can repeatedly scan the same area to increase the "recognition accuracy".

The worst thing is that the aircraft at this time are all propeller-powered, which means that they cannot be installed on the nose, but can only be placed in the rear cabin. As a result, there was a problem with the installation of the two antennas.

With two antennas on top of the plane, it's impossible to just be naked. If it's exposed, you have to have a cover. The requirements for this cover are even stricter, and "absorbing materials" must not be used, otherwise it will not be a radome, but a shielding net!

Secondly, the radome must also have a certain strength, and if the aircraft is blown away as soon as it accelerates, or is blown out of shape, it is also completely finished.

Finally, the masters of the Guò plastic factory figured out a plastic cover with sufficient strength, thin thickness and uniform texture, which solved the problem of antennas, but the bigger trouble came out again.

This is the second problem: the volume of the transmitter and receiver, which creates the problem of scanning distance.

In this day and age, let alone transistors, it is difficult to even get tubes. Bai Shujie turned over all the more than 100 fishing boats and freighters that had been determined to be demolished, and some old-fashioned communication radio stations were dismantled, and finally collected enough electron tubes for three pieces of equipment.

However, the problem with the tube is that it is large, and the transmitter and receiver that are made are very large.

Bai Shujie led his secret team to build Zuò's first test radar, the transmitter and receiver weighed more than 80 kilograms, and the dimensions were 3 meters wide, 5 meters long, and 1.5 meters high.

Although the detection range is definitely ahead of its time, reaching 120 km. But with these two big guys, it doesn't matter if they are usually used on the ground, and it doesn't matter if they are moved to ships and warships for the time being, but it will be troublesome to get them on the plane!

After some deliberation, Bai Shujie believes that the radar scanning distance of this era does not need to be too far, and it is enough to figure out the radius of 40-80 kilometers.

The maximum speed of the aircraft of this era is also less than 700 km / h. The more advanced fighter is only about 680 km / h.

If the radar can detect an aircraft 40 kilometers away, the pilot will have about 4 to 5 minutes to react. Either choose to flee, or choose to seize the advantage of the altitude to ambush the enemy aircraft.

By reducing the scanning sensitivity, the transmitter and receiver can be reduced in size.

Bai Shujie's current technical conditions are limited, so he can only temporarily choose a magnetron oscillator to transmit signals. It is controlled by a pulse modulator, and the generated high-frequency pulse power is fed directly to the antenna, which is then emitted after the antenna gain is transmitted.

A magnetron consists of a die and a magnet (or electromagnet). The structure of the die includes four parts: anode, cathode, energy output and magnetic circuit system.

After these major problems are solved, the defects of the tube itself are finally left, that is, high power consumption and easy overheating, which have a great impact on the sensitivity of the signal receiver.

Especially after compressing the volume of the transmitter and signal receiver, these problems become more prominent. After several failures, Bai Shujie finally did not give up, and finally he could use it in front of him.

There is no air conditioning in the current plane, and even the fan can't be installed, so Bai Shujie can only take out a Type 96 G3M2A medium bomber, directly fix the motherboard in the cabin, and then use a layer of gauze to make a cover, which can block the dust.

In other words, the so-called "airborne radar" that Bai Shujie concocted was like a computer host in later generations without a chassis. Ben".

In any case, this is an epoch-making achievement. After the plane's lift-off test, the "Feilong-1 radar" named by Bai Shujie took off from Myohyangsan and was able to identify a plane that took off synchronously from Pyongyang's Gangnam airfield 75 kilometers away.

Finally, the practical detection range was determined to be 75 km. In other words, with all aircraft currently flying at maximum speed, their own pilots have 7 minutes to react!

Bai Shujie chose the Type 96 G3M2A medium bomber as the airborne radar carrier because the little devil's aircraft has a cruising range of 4,000 kilometers.

Because it is not necessary to carry 800 kg of aerial bombs, but an auxiliary fuel tank is added, the cruising range reaches 4800 km, and the combat radius is 2200 km.

The Type 96 G3M2A medium bomber is at an altitude of 3000 meters and has a maximum level flight speed of 350km/h. That is, after modification, with the drop fuel tank, it can fly continuously for 13 hours (without taking into account the bearing capacity of the fuselage and engine).

Therefore, Bai Shujie decided to modify two planes in one go, so that he could serve as an air command mission 24 hours a day in a state of war, and use two fighter squadrons to take turns to take up and fight.

This time, Wang Xinlan led a team to the United States and Europe, and one of the important tasks was to purchase the most advanced electron tubes, oscilloscopes, filters, and displays, and then to further improve the airborne radar and create a real eye in the sky.

In fact, Bai Shujie was the first to choose the little devil's Type 97 KI21 heavy bomber as the radar carrier, but he never understood why the latest bomber has a cruising range of only 2500km. Even if you don't load a 1,000-kilogram aerial bomb and change it to an auxiliary fuel tank, the cruising range can only reach 3,200 kilometers.

Zhao Jinxi followed Bai Shujie to board a plane numbered ZH001, and found that the cabin was "messy", and he was suddenly a little inexplicable: "Is this what you are busy with?" How does it look like a wet market? Also, what are the two bulges on the back of the plane? ”

"This is the air command." Bai Shujie explained in the most popular words: "The people on this plane can detect the enemy's plane in advance, and then notify their own people to take appropriate countermeasures." ”

Zhao Jinxi finally discovered what he knew: "You brought our general-purpose machine gun up?" ”

Bai Shujie smiled and said: "Yes, the original weapon of this aircraft was 2 7.7mm machine guns, which were too powerful. We didn't need to bring bombs, so I turned the original 2 machine guns into 4. And all the bullets equipped are armor-piercing incendiary bombs, as long as one bullet hits the target, the little devil's plane will definitely be finished. ”

"This plane has a crew of 7 people, and I still have 7 people after the modification. Among them, there are two drivers, 1 antenna controller, 1 transmitter controller, 1 signal receiver, and 2 machine gunners. 4 machine guns in four directions, two machine gunners can choose what position to use at any time, depending on the direction of the enemy aircraft. ”

Zhao Jinxi nodded: "You just said that you were worried about the annihilation of the whole army, what did you mean?" ”

Bai Shujie's face fell suddenly: "I'm thinking, the straight-line distance from Pyongyang to Tokyo is 1,300 kilometers, and a round trip is 2,600 kilometers." Together with the search for targets and bomb dropping, two circles are required, that is, almost 2700 kilometers. For such a long time, the fighters of the little devils will definitely come out to fight. ”

"The key problem is that without a ground control tower to guide the way, blind flying in unfamiliar airspace is extremely dangerous, and if you don't do it well, you don't know how to get back. Although I used the gyroscope to make a simple positioning header, it was still easy to have problems in the heat of battle. ”

Zhao Jinxi stared at Bai Shujie and said, "Preparing to take action against Tokyo, have you discussed it with Zhang Nianzu?" ”

"It's been discussed!" Bai Shujie nodded: "It was they who took the initiative to come to me, because the pilots strongly requested to bomb Tokyo and indirectly support the defense of Nanjing." They are currently working on how to improve the bomb magazine. ”

"Because I specially designed an air-dropped napalm, each 100 kilograms, and each bomber carried four. An additional 400 kg drop fuel tank was added to increase the range to 4,400 km. ”

"The point is that the combat radius of our fighters is only 300 km, and there is no way to escort bombers. The biggest problem with bombers is that their speed is too low, and if they are chased by enemy fighters, they are very passive. I'm talking about the possibility of total annihilation, that is, the bomber formation that went out will probably not be able to come back! ”

Zhao Jinxi looked at the sky and pondered for a long time, and finally said: "We are not trying to occupy the Japanese island, but to punish those war madmen. So my point of view is that there is no need for precision bombing at all, as long as you can drop incendiary bombs into downtown Tokyo and then immediately return and escape. ”

"You also said that the biggest problem of fighter jets is the pursuit of speed, and the guide has very little fuel load, which limits their endurance range. So let's think about it the other way, as long as our bomber formation moves fast enough, after dropping the bombs, we can fly as far as 500 kilometers away, what can the enemy do? ”

Bai Shujie smiled bitterly and said: "It's all because I didn't make it clear to you, because in addition to ordinary warships, there are also aircraft carriers!" What is an aircraft carrier? It was a very large warship, with a lot of fighters and bombers roaming the sea. If the fighters of the little devils take off from an aircraft carrier to intercept, then it is really dangerous! ”

"Commander-in-Chief, you are wrong!"

At this moment, Zhang Nianzu, the commander of the aviation division, came over with the pilots of the light bombardment squadron, and immediately said: "Brothers of the ground forces, is it dangerous to fight the enemy face to face?" They would rather use their bodies to roll mines, for what, exactly? ”

"Our mission is to fly to the heart of the enemy and drop the bombs. As for the danger, in the course of the battle, that place is not dangerous? If we were timid, we wouldn't choose to be pilots! ”

The pilots shouted in unison: "We have already lost the three eastern provinces, and today we finally have a chance to be ashamed." Please, Commander-in-Chief, give the order, we will set out at one o'clock and bomb Tokyo at five o'clock in the afternoon to take revenge! ”

After all, what happens next, let's see how it will be broken down next time.