Shen Wanqing nodded solemnly and said, "This reminds me of one thing!" ”

Lin Yuan was very surprised in his heart, and thought: "This incident has just happened, it is absolutely impossible to know the Dao before Wanqing, but looking at her appearance, she must know something that I don't know, what could it be?" Thinking of this, Lin Yuan asked, "Wanqing, what do you think of?" Tell me quickly. ”

Shen Wanqing said: "Let's talk while going to eat. The two walked outside side by side, and Shen Wanqing said as she walked: "I remembered a piece of information about the social situation in North Korea, and that piece of information was like this: The Japanese defenders of Hamgyong Mountain asked the nearby residents to pay a few catties of pine resin to each family, and I can't remember exactly how much." ”

Lin Yuan asked, "Does this piece of information have anything to do with what I said?" ”

Shen Wanqing said: "I suspect that the Japanese army burned pine resin, and that kind of thing is easy to burn, as for the black smoke, just pour some water on it when the pine resin is burned." ”

Lin Yuan thought for a while and said, "What did the Japanese army do in the mountains and burn pine resin?" ”

Shen Wanqing shook her head and said, "I don't know what to do, maybe it's a religious ceremony." Lin Yuan smiled, the two went to dinner, and put this matter down, early the next morning, Lin Yuan received a message from Xiao Yingwu, saying that the smoke had dissipated, Lin Yuan immediately sent a message to Xu Feng, asking Xu Feng to continue to take off and reconnoiter the situation.

Xu Feng took off at 8 a.m. and sent a message to Lin Yuan at 8:20 a.m., saying, "It's strange, the Japanese army has started burning things again!" ”

Lin Yuan asked in surprise, "Started burning things again?" What are they going to do? ”

Xu Feng sighed and said, "Little devils are not human, so they can't be guessed by people's way of thinking!" ”

Lin Yuan didn't speak, but pondered the purpose of the Japanese army's burning things, and then Xu Feng said: "Okay, don't talk about it, I'm going to return, you can notify me when the smoke clears." ”

Lin Yuan agreed, Xu Feng immediately returned, Lin Yuan stood up, paced around the office, and thought to himself, "What are the Japanese soldiers going to do?" What are they burning in the woods? What is it burning? Our planes were blocked twice by thick smoke......"

Lin Yuan suddenly stopped and thought, "What did I think of just now?" 'Our planes were blocked twice by smoke', that's it! This sentence explains: As soon as our plane flies near the little devil, the little devil will start burning things, and burning things will produce thick smoke, and our plane will be blocked, right...... Could it be that the little devils burned things to block our fighters? ”

Thinking of this, Lin Yuan shook his head again and again, and told himself in his heart: "Impossible, absolutely impossible!" If the little devils burned things to block the plane, then they had to know in advance that the plane was going to fly to them! Although they know that we have planes, how do they know that our planes are going to them? Did they come up with a radar! ”

Lin Yuan took a deep breath and thought: "Don't jump to conclusions so early, maybe the Japanese army uses the most primitive method of visual search for aircraft, but when Xu Feng first discovered the black smoke, it was more than fifty kilometers away from the little devil, more than fifty kilometers, with the visual stealth design of the J-25, it is impossible for the little devil to find it with his eyes fifty kilometers away!" ”

The more Lin Yuan thought about it, the more he wondered, and thought, "Could it be that the little devil really made a radar?" First of all, in principle, the sale of radio communication equipment has promoted the research of radio in the world, and all countries in the world have carried out research on the use of electromagnetic waves to detect and locate targets, and it is very likely that Japan has already achieved considerable results. ”

"On the basis of technology, the tube industry in the world has a considerable level, the early radar operating frequency is relatively low, and the communication frequency is basically the same, with the emergence of the magnetron in the future, the working frequency of the radar is gradually increasing, so the electron tube of this era can fully support the radar made in Japan, and it is entirely possible for Japan to develop a radar!"

Thinking of this, Lin Yuan immediately contacted Xu Feng and said, "You haven't landed yet, have you?" ”

Xu Feng said: "It's entering the field, it's going to land immediately, what?" Is there something you can do? ”

Lin Yuan said: "You return immediately, I suspect that the little devil found you with radar!" ”

After hearing this, Xu Feng laughed, and Lin Yuan asked anxiously, "What is ridiculous about you?" Xu Feng said with a smile: "I'll talk to you when I pull the plane up first, and then I'll talk to you when I get to the sky." So Lin Yuan heard Xu Feng say: "Bird's Nest Bird's Nest I am a flying eagle, the situation is urgent, I will not land for the time being." ”

After a while, Xu Feng said: "Okay, I'm at high altitude now, I'll tell you why I want to laugh at Lu, our plane is a stealth fighter!" It is difficult to detect even the advanced radar of the Americans of our time, and even if the Japanese have come up with a radar now, it is an old-fashioned radar of an earlier model, how can it be possible to detect us? ”

Lin Yuan said with a smile: "You bragged to me yesterday that you are a genius who will never forget, and you have forgotten the lesson on 'radar target characteristics' taught at the flight training base?" The radar reflection cross-sectional area of the target changes with the change of the radar's working frequency band, and a certain type of aircraft will 'show' the electromagnetic waves of other frequency bands if it is stealthy to the electromagnetic waves of other frequency bands, so no aircraft can stealth the electromagnetic waves of all frequency bands! ”

"Take our J-25 as an example, most of the target search radars and target tracking radars of our time work in the X-band, and our J-25 is designed to be X-band in order not to be discovered and tracked by the enemy's radar, and the frequency of electromagnetic waves used by the current Japanese army must be far lower than that of the X-band, so their radar can completely see you."

"They can see you, but they only know that there is a flying object flying towards them, and nothing else, but that's enough, because their plan is to set fire to something as soon as they see it coming, and it will envelop them with smoke! So that we can't attack them! ”

Xu Feng was so surprised when he heard Lin Yuan's words that he didn't speak for a long time, Lin Yuan said at this time: "In order to save equipment, our pilots don't turn on the radar's electronic reconnaissance and jamming module when they fly, so you haven't been able to find the electromagnetic waves of the Japanese radar, you can fly back now and detect whether there are Japanese electromagnetic waves in the airspace!" ”

Xu Feng thought for a while and said, "Don't you have an electronic jamming company?" Why don't you let them interfere? ”

Lin Yuan said: "The electronic jamming unit's electronic jamming machine works in a very narrow frequency band, and the operating frequency of the Japanese radar must exceed their detection frequency band, otherwise they would have reported it to me a long time ago." ”

Xu Feng said: "Okay, I'll go to their airspace and detect their electromagnetic waves." After Xu Feng finished speaking, he returned to the Japanese position, and turned on the electronic reconnaissance module of the airborne radar when he was close, and soon the screen displayed: Unfamiliar frequencies were found!

Xu Feng couldn't help but exclaim and said, "Okay! The little devil really got the radar out! ”