"Jianhua, there are so many People's Liberation Army standing guard here!" Wang Xiaozhen suddenly turned her head and said.

"This is a dual-use airport!" Zhou Jianhua leaned back in the chair and looked at Wang Xiaozhen with a smile, and replied:

"There are a lot of military planes in the airport, and of course the PLA has to guard them."

"Oh! Military Aircraft ...... It's a fighter, right? Wang Xiaozhen thought for a while and asked:

"Have you seen the movie "Eagle in the Sky"? That inside the North Koreans beat the American planes to the ground! ”

"Oh...... It's an old movie......" Zhou Jianhua thought about it and replied:

"In addition to the piston type La-11, the fighters we used to resist US aggression and aid Korea were MiG-15 jets, all of which were imported from the Soviet Union."

"Imported? Those are not our own aircraft? Wang Xiaozhen asked strangely.

"No, however, later we had other aircraft of our own production, but they were also copied from Soviet ......," Zhou Jianhua replied:

"Our J-5, J-6, and J-7 are all imitations, and these aircraft are more powerful than the MiG-15 you see in the movie, well, now the J-8 aircraft is also available, and the J-8 II aircraft ...... Alas! Prototypes haven't made their first flight yet. ”

Zhou Jianhua said while thinking that the design and manufacture of China's J-8 II aircraft can be described as the most difficult one!

The design and manufacture of China's fighter jets began to conform to the world trend from the Jian-8 II, no longer pursuing "higher and faster", but focusing on improving the aircraft's maneuverability at medium and low altitudes, and perfecting the on-board electronic equipment, weapons, and fire control systems. However, at this time, the domestic electronic technology capability was not strong enough. On the one hand, there was no longer the help of the Soviet Union, and on the other hand, it was blocked by Western technology, and later it was difficult to engage in a "model of peace" project with the Americans. In the end, it didn't happen at the end of the 80s, what a fate!

The main problem of the J-8 II aircraft is still in the airborne radar, the design capability of the radar is only one aspect, and the bigger problem is that the production and manufacturing capacity of the components required for the radar cannot keep up, which is not a problem that can be solved in one or two days, and this is a relatively backward problem in the country's entire electronics industry.

Fortunately, now the country has begun to reform and open up, otherwise. China's electronics industry simply does not have a chance to catch up with the level of advanced countries, and later fighters, with their electronics, weapons and fire control systems, are increasingly playing a decisive role in air combat. Without the technological progress brought about by reform and opening up, China's national defense modernization can only be an empty word! It seems that if you really want to make some achievements in China, you must strive to develop the domestic electronics industry as your first priority.

"There are so many kinds of fighters?! Jianhua. You know so much! Wang Xiaozhen said in surprise. interrupted Zhou Jianhua's thoughts.

"It's almost time! Let's go! Seeing that Wang Xiaozhen had also finished eating the apples, Zhou Jianhua asked her to put the fruit knife into the big travel bag, thought about it, and took out the two homemade electric batons in her tool bag and stuffed them into Wang Xiaozhen's big travel bag. Zhou Jianhua didn't want to have any problems at the security check, and if she checked her big travel bag randomly, she should be fine.

"What are you?!" Wang Xiaozhen saw Zhou Jianhua stuffing two flashlights-like things into his travel bag, so he asked curiously.

"It's something that's meant to protect you." Zhou Jianhua pretended to smile mysteriously:

"Deal with the bad guys! When you get to Xizi City, I'll give you one and teach you how to use it. ”

Zhou Jianhua finished speaking. Without waiting for Wang Xiaozhen to say anything, she took her big travel bag and went to change the boarding pass. I checked my trip in and got on the plane after the security check.

This is an Il-18 airliner, a Soviet-made four-engine turboprop short-range airliner with about 80 seats. Several female flight attendants on the plane all have ear-length curly hair, blue twill suits, tube pants, and black leather shoes, although this dress is not as beautiful and dazzling as the flight attendants of later generations, but it makes people feel simple and kind.

Zhou Jianhua and Wang Xiaozhen found their place to sit against the window, as soon as Wang Xiaozhen sat down, he put his face close to the porthole of the plane on the right side and looked left and right excitedly, and a Jian-7 plane roared down on the runway in the distance, and a red and white parachute was thrown out behind the fuselage.

"Wow! Jianhua look! Plane! Fighter plane! Wang Xiaozhen shouted excitedly.

Her exclamation caused several people in the surrounding seats to turn their heads to look at her.

Zhou Jianhua pursed his lips and turned his head to look back at everyone embarrassedly and smiled, and a middle-aged man in a Mao suit on the left smiled and asked:

"Young man, is this your first time flying?"

"Yes! Hehe......" Zhou Jianhua smiled at him and replied, then turned his head and whispered to remind Wang Xiaozhen:

"Sister Wang, be quiet, it's so loud that everyone thinks that the plane is dropping bombs! Scary, isn't it? ”

"What do you want?! Isn't this the first time you've seen a fighter jet land? Wang Xiaozhen turned around and said dissatisfiedly:

"You're going to hit me ......"

"Hehe, how dare I! I'm counting on you to help me import more components in the future! Zhou Jianhua replied with a smile.

"Hmmm! It's good that you know! Wang Xiaozhen replied proudly, then turned his head to look at the fighter plane that had stopped far away, and couldn't help asking:

"How do you say those fighter pilots aimed at enemy planes when they were fighting? I saw that the cannon in the movie was under the plane, and they were sitting on it, how could you see it......"

"They have special aiming equipment, and they don't aim directly with their eyes like a gun." Zhou Jianhua explained:

"Today's fighter jets have an electronic fire control device with a weapon aiming computer, which directly displays the signal returned by the fire control radar on the display, and people can see whether they are aiming at enemy planes when they sit in the cockpit."

"Oh...... It's so advanced......" Wang Xiaozhen muttered back, still looking out the window without blinking.

"At present, the electronic equipment on our national fighter jets is not advanced, so it can only be said that it can barely be used...... Zhou Jianhua sighed softly and replied:

"Now whether it's J-7 or J-8. Our country is still trying to find a way to introduce the technology of airborne electronic equipment from abroad for them, and we are really much worse than foreign developed countries. People have already developed and started to equip pulsed Doppler radars, but we have only just started developing them......"

"What is pulse-Doppler radar?" Wang Xiaozhen turned her head and asked curiously.

"Uh...... This is not easy to explain, you don't understand it......" Zhou Jianhua smiled at Wang Xiaozhen and replied.

"You're going to be a cow in front of me! How do I know if you don't say? Wang Xiaozhen pursed her mouth again with dissatisfaction, squinted at Zhou Jianhua and said excitedly:

"I'm afraid you can't tell yourself, right? You're still fooling me......"

Zhou Jianhua heard Wang Xiaozhen complain like this, and suddenly felt that she should be more patient with her, speaking of which, she has always been quite enthusiastic about herself. Now that she has this curiosity, or this desire for knowledge, of course she shouldn't snub her.

Zhou Jianhua thought about it seriously. Explain it to her:

"How so...... I don't know if you've noticed, but every time you're waiting at a bus stop, if a car whistles past you, do you feel like the car is a little sharper when it approaches you than when it moves away from you? ”

"Hmm...... I think that's how I feel! Wang Xiaozhen nodded and replied.

"Hmmm! The frequency of the sound emitted by the horn of a car is actually fixed. But because the car and you have a relative speed of movement. So, when the sound of the horn reaches your ears, the frequency of the sound you hear changes, so if you are careful enough, even if you listen to the horn of a car with your eyes closed, you can hear its approximate speed and direction. Zhou Jianhua nodded, smiled and continued to explain:

"Doppler radar is based on this principle. The relative velocity of the object is measured according to the frequency of the radio waves reflected back by the object, and the time difference between the transmission and reception of the pulse is used. In particular, it can also detect the Doppler frequency spectral lines of the target by frequency filtering, and filter out the spectral lines of interference clutter, so that the radar can distinguish the target signal from the strong clutter. Therefore, pulse Doppler radar has much stronger anti-clutter jamming ability than ordinary radar, and can detect active targets hidden in the background, which is very advanced today. Hehe...... Do you understand? ”

"Oh...... I seem to understand a little bit. Wang Xiaozhen pursed her lips and smiled and replied:

"Since this radar is so good, why didn't our country start developing it earlier?"

"Because the development of this kind of radar requires the use of large-scale integrated circuits and digital processing technology, our country is still very backward in this regard...... Zhou Jianhua explained again.

"Oh...... It turns out that this is the case, and it is a problem of integrated circuits......" Wang Xiaozhen nodded and sighed:

"Jianhua, I also think that our country's electronic technology is too backward, we have to spend so much foreign exchange to import so many electronic components every year, if our country can produce those components by itself, how much money will we have to save! Jianhua, your level of electronic technology is so high, and you are a top talent in our province, can't you think of a way to make some efforts in this area and make some contributions to our country? ”

"Huh...... Sister Wang, even if I am covered in iron, how many nails can I twist? Zhou Jianhua replied with a wry smile:

"All I can say is do your best! I've been doing something for our province during this time, don't you know? ”

"Hee-hee...... Of course I do! Wang Xiaozhen pursed her lips again and smiled:

"Otherwise, why don't the leaders of our system value you so much! Hey hey ......"

Zhou Jianhua leaned on the seat and glanced at Wang Xiaozhen, "hum" smiled, and didn't say anything, his heart said that you just continue to pretend!

Wang Xiaozhen pursed her lips and smiled and didn't say anything, reached out and took out a magazine from the back pocket of the seat in front of her and flipped it up, it was a 83-year issue of the "Civil Aviation of China" magazine, the cover was printed with a gorgeous peony picture, which was also printed in color, with various cultures, arts, fashion and current affairs introduced, 16 folios of 50 pages, coated paper printing, beautifully printed, in this era can be described as a high-end atmosphere on the grade, the back cover is a "555" cigarette advertisement!

"Oh! I didn't expect the three-five brand cigarette advertisement to be here! Zhou Jianhua couldn't help but sigh, saying that such a high-end magazine and such a good advertising space. After all, the market has not been completely liberalized, and few of those state-owned enterprises will have this motivation.

Seeing that Wang Xiaozhen was very serious about flipping through the magazine. Zhou Jianhua also took out the atlas and looked at it.

At this time, the door of the plane was closed, the plane began to slowly move towards the runway, and the in-flight radio began to remind everyone to fasten seat belts and other precautions, and several flight attendants with curly hair also patrolled the aisle to see if everyone had fastened their seat belts.

Zhou Jianhua glanced around and found that there were still many empty seats in the cabin. The starting point of this flight is "Nandu", but the end point is not "Xizi City", but "Shangpu City", the birthplace of China's national industry. "Xizi City" is just one of the provincial capitals that will stop in the middle of this flight. The ticket price from "Nandu" to "Xizi City" is 78 yuan, and the whole journey is 92 yuan. Even though there is only one flight a day, and it stops in two places, plus free tickets and "cadre tickets", this flight is not full. It can be seen how low the people's spending power is at this time.

"Young man. Where are you going? The middle-aged man in the tunic on the left suddenly spoke again.

"Oh! Let's go to "Xizi City", what about you? Zhou Jianhua put down the atlas and turned his head in response.

"Oh, we're on a business trip to Shangpu City. The middle-aged man roughly pointed to a young man in his 20s who was also wearing a Mao suit on the other side and said, "You guys are traveling to "Xizi City", right?" ”

"Hehe, yes!" Zhou Jianhua nodded and replied casually.

"I heard you talk about airplanes and airborne radar just now, you seem to know a lot about this." The middle-aged man said with interest:

"The girl next to you also said that you are the top talent in electronic technology in the province, can I take the liberty of asking what you do?"

"Oh! I'm sorry, my sister was joking. To make you laugh, I'm just a "self-employed" person. Hehe...... "Zhou Jianhua didn't expect the listener to have a heart. Wang Xiaozhen commented on herself like that just now, she does have some self-righteous realm, and now that everyone has ideas, should she be unconvinced and want to "learn" from me? Most of the people who can get on the plane these years will not be ordinary people, how can people allow such a "young man" to be so ashamed?

"Where am I talking nonsense?!" When Wang Xiaozhen heard Zhou Jianhua say this, she immediately retorted aggrievedly:

"That's what we Zhang Gong said! Why are you talking about me? ”

"Huh...... Zhang Gong is just talking casually, this can't be taken ......seriously," Zhou Jianhua stretched out his hand and touched his neck and replied tangledly.

"Oh? Girl, which unit is the "Zhang Gong" you are talking about? The middle-aged man asked Wang Xiaozhen with a smile again.

The "Zhang Gong" I am talking about is a senior engineer of our provincial electronic equipment trade service company. Wang Xiaozhen replied without any city:

"People in the industry say that Zhang Gong is a leader in the field of communication equipment in Jiangnan Province! Can what he said be false?! ”

"Oh! So you're all such powerful characters?! The middle-aged man looked at Zhou Jianhua's young face suspiciously and said in disbelief, and after a while, he asked again:

"Young man, may I ask you what your name is?"

"My name is Zhou Jianhua, how do you call the two of you?" Zhou Jianhua replied.

"Zhou Jianhua?!" The young man on the left side of the middle-aged man who was listening to their chatter suddenly exclaimed, and looked at Zhou Jianhua with a surprised face.

The middle-aged man turned his head to glance at him, then turned back to Zhou Jianhua and smiled and said:

"Oh! Then I'll call you Xiao Zhou, hehe...... My surname is Huang, you can call me Lao Huang, my colleague's surname is Jiang. ”

"Oh, hello Lao Huang!" Zhou Jianhua nodded at the middle-aged man, nodded at the young man and said "Hello" as a greeting, thought about it and asked in confusion: "Brother Jiang, do you know me?" ”

"Ah...... I don't know! Hehe...... "The young man hurriedly replied when he heard Zhou Jianhua's question, and then glanced at the middle-aged man again, then turned his head and closed his eyes to recuperate and stop talking.

The middle-aged man raised his eyebrows slightly, groaned slightly, and asked Zhou Jianhua again:

"Xiao Zhou, how long are you going to go out this time?"

"Three or five days." Zhou Jianhua replied casually.

"Oh......" The middle-aged man nodded slightly, and then said with a smile:

"Yes, "Xizi City" is picturesque, and it is worth a few more days! Hehe......"

As he spoke, the plane had already followed the towpath to the take-off line of the runway, and the buzzing sound of the aircraft's gas turbine became louder and louder, and the plane began to slide forward, faster and faster, and in a moment it took off from the ground and went straight to the sky.

Wang Xiaozhen has been twisting and lying on the porthole of the plane to watch the terminals, airports, villages, rivers, and winter rape fields flying by the window that are getting lower and farther away...... The plane flew higher and higher, the field of vision became farther and wider, until the plane flew into the clouds, and there was nothing to see except the white expanse, she breathed a sigh of relief, turned back to lean back in her seat, closed her eyes and stared thoughtfully.

Zhou Jianhua looked at Wang Xiaozhen sideways, did not speak, and continued to pick up the map and look at it. After a while, the plane passed through the clouds, the cabin was bright again, and the plane stopped climbing high and stabilized. Several female flight attendants appeared in the aisle again and began to distribute food and drink to everyone, and the cabin immediately became lively.

After a while, a female flight attendant pushed a food cart to Zhou Jianhua's row and distributed a small pack of 5 "Chinese cigarettes", a glass of juice, and a handful of fruit candy to each passenger.

"If you don't have enough fruit candy, you can ask me for it, and dinner will be delivered in half an hour." (To be continued......)