Back to the Republic of China to be a editor

Similar to Li Qiang, Tang Hua is in Xinxi County's second ground survey center, where there are also P-3 radars, Hongqi-1, and Hongqi-2 air defense missile systems, but the S-25 missile base is some distance away from here. 25 kilometers south is Changfeng, which is the S-25 missile base of the Korean People's Army.

The reason for choosing Singye County as the second test point is that this is an ideal valley bottom in north-central North Korea. There are mountains on all sides of the valley bottom at a lower altitude. The low angle of the radar is blocked by the mountains, which can test the sudden appearance of the target. Whether the IFF system can get a response immediately.

Seeing that the first and second ground survey centers are ready, Chang Qiankun said on the phone: "Then the base will start to fly. One can respond to MiG-15s; two MiG-15s that do not respond."

Calculated at a cruising speed of 600 km/h, the MiG-15 will be discovered by Li Qiang's Second Earth Survey Center in about 20 minutes, and will enter Tang Hua's detection range in another 10 minutes.

During the time when the MiG-15 arrived, both centers waited patiently.

"Find the air target!" The radar soldier in front of the monitor shouted.

Tang Hua was in the control room of the P-3 radar. He walked to the monitor and saw the echoes of three small targets suddenly appeared in the sky.

The three targets are very close, and the item tested today is the identification of friend and foe among dense targets.

They are all three small white dots, but one of them is framed by a white box.

Electronic password response - identification system works!

"First scan." Tang Hua counted.

The P-3 radar is now spinning at 10 rpm, which means that the airspace image on the kinescope monitor is updated one screen every six seconds.

Of course, it's not that the entire screen "swipes" every 6 seconds to change a frame.There is a bright line from the center of the pure circular monitor to the edge, and it rotates continuously, exactly 6 seconds to make a circle. When the bright line crosses, the image is the latest image, and the screen area where the bright line is about to cross, the image is older (nearly 6 seconds ago) the empty image.This is how the monitor screen is updated.

In fact, the bright line can be regarded as the polar coordinate position pointed by the radar electromagnetic wave transmitter.

Tang Hua is now waiting for the P-3 radar to scan the target again after making a circle, whether the MiG-15's transponder will still send out a response signal, and whether the identification system will still recognize it as a friendly aircraft.

6 seconds passed quickly, and the data was refreshed.The positions of the three white dots have changed respectively, indicating that within the past 6 seconds, the three planes have flown a certain distance in the air.

The small white dots that were marked by a white box last time still have a white box.

"Second sweep."

Another 6 seconds.

"The third scan, the identification friend or foe system is normal." Tang Hua was talking to himself in a low voice.

"Fourth sweep, no?"

"The report is that no response signal from the testing machine was received."

"Fifth scan, yes."

……

It took 1 minute and 25 seconds for the three test MiG-15s to enter the detection range of the P-3 radar station and then fly out of the detection range.The radar scanned 20 times during this period. Among the 20 echoes, the IFF system was normal 17 times, no response signal was received 2 times, and the response signal was received 1 time but the identification system said it was wrong.

"Station Erjia reported that the radar scanned 30 times, the identification friend or foe system responded normally - 27 times of identification, and did not receive a response signal 3 times." The report call from Station Erjia was the search for the Hongqi-1 surface-to-air missile system Radar is working.

"Second Station reported that the radar scanned 30 times, the IFF system responded normally - 26 times, did not receive a response signal 3 times, and received a response signal once but failed to pass the identification." The second station is Hongqi-1.

After recording the data of the two sub-stations, Tang Hua picked up the phone and wanted to call Li Qiang first.

"Li Qiang, how is your data?"

“P-3扫描22次，正常18次，4次没接收到应答信号。S-25系统的A100雷达扫描20次，正常17次。红旗-1扫描30次，正常27次，红旗-2扫描30次，正常26次……”李强那边也刚刚统计完毕。

Chang Qiankun also stayed online on the dedicated line, listening to Tang Hua and Li Qiang reporting data simultaneously.

"Minister Tang, the test results are not too different from our data at the air force test base."

Tang Hua: "When you were at the air force test field, did you do the test in sunny weather?"

Chang Qiankun: "Yes, our planes dare not fly out even in thunder and rain."

...Okay, okay.

Anyway, the U.S. Air Force does not have all-weather combat capability now.

Tang Hua: "Though the past few days have been tense, but fortunately everything is going well. The tests on the mountains and plains have been completed, and the next stage is the air force and the Pyongyang Station to conduct exercises. Li Qiang, Commander Chang, I wish you all the best."

After the test, it enters the exercise stage, which is close to the actual combat mode: Tu-2 or Tu-4 bombers, a team of 2 to 4 planes, fly at 5000 meters (Figure-2) and 6000 meters (Figure-4), all the way along The land of the Korean peninsula flies south.Then the Air Force will send a few MiG-15s to act as F-86, using the basic routine of the U.S. Air Force - avoiding the combat range of S-25 air defense missiles, wandering in the air at 13000 meters, when the bomber passes by here, it will fly from Dive down to intercept at high altitude.The Hongqi-2 air defense missiles on the ground are responsible for driving away the "U.S. fighter jets". This requires the radar to capture the enemy planes in the shortest possible time, accurately identify which one is the enemy plane and which one is the friendly plane, and then the Hongqi-2 missile system enters Track and lock, and quickly reach the state where the missile can be launched - there is no need to actually launch the missile, just to see how much the target is captured and locked, as long as the movement is fast enough, the missile can fly before the F-86 bites the bomber.

The actual combat exercise mode can be done in Pyongyang. Tang Hua is now fine with the IFF system.But since it is rare to come to North Korea, Zhisi has to go, and now the jeep sent by Zhisi is outside the gate of the Earth Survey II Center.

"Hello, Commander Peng."

It was the first time Tang Hua saw Mr. Peng at close range.When shaking hands, I found Mr. Peng's skin was a little... pale.The black and strong man in the historical picture seems to have been in the air-raid shelter for a long time.

"Mr. Peng, now the U.S. Air Force has almost no way to conduct air strikes, and there is no need to work in an air-raid shelter all day. It is good for your health to come out and bask in the sun."

"Don't be afraid of [-], just in case." Mr. Peng said, "It's not just my fault. It's a problem with the command system of the entire Zhisi and the Volunteer Army."

"Secretary Cao." Tang Hua then saw "Xiao Cao".

"Hello, Minister Tang."

Tang Hua whispered, "The three of us go to Room 0 first."

Room 0 is the mail room of the confidential communication line, which is a corner of the iron triangle of 50 Center, Beijing, and Zhisi.

"This hole is very humid..." Tang Hua solved the problem that had not been solved by sending messages through the computer before, and even grabbed a program from the computer in the 50 Center to the local area, and then looked around, "Do you have any drying and dehumidification?" Take measures?"

"Quicklime, there are several small bags." Xiao Cao pointed to the corner of the room, "In addition, in May and June, sometimes I have to wipe it with a dry cloth, and I do it myself."

……

"Secretary Cao, here it is." After finishing business, Tang Hua took out the envelope, which contained a stack of photos and letters.

Xiao Cao opened the envelope to look at the photo.

"Wow, my Xiaoxin, hehe..."

Looking at the next photo, the chairman is holding Mao Xinhua, who is four or five months old, smiling so hard that he can't close his mouth.

"Xiao Cao, you haven't returned to China since February this year." Tang Hua said.

"He has never left North Korea since he returned to North Korea in May last year," Mr. Peng said.

Xiao Cao: "The job position is very sensitive, and it is very troublesome to ask for leave, so I just stayed. My father said that in January 53, I will be transferred back to China to work in the State Planning Economic Commission."

Tang Hua: "Oh, that's true. After another three months, I can return to Beijing."

……

South of Lianchuan and north of Dongduchuan, the underground fortifications of Xiaoyao Mountain.