Before 1945, radar technology in Sweden, a military power in northern Europe, was largely blank. With the end of World War II, witnessing the changes of modern warfare, the Swedish military is committed to introducing new equipment such as radar, jet engines, rockets and other new equipment to the Western camp, but due to political considerations, Sweden finally obtained most of the finished products with technical secrets, so when the old aircraft manufacturing company "Saab" made a breakthrough in the production of jet engines, the Swedish official decisively gave policy and financial support, and when another company that claimed to have radar independent technology invested in Sweden, Stockholm was equally decisive, embracing the electrical company called "Sketer", even though it was rumored to have been founded by a group of fugitive German scientists.

In the face of the doubts of the Swedish people, the nameless "Sketer" quickly proved the Swedish official vision with his strength, and it only took them half a year to help the Swedish military establish a radar air defense early warning system around Stockholm, and at the beginning of the year, 70 percent of the vast Swedish territory has been included in the radar detection range, from the cold Kebna Mountain in the north to Malmö across the sea from Denmark in the south. On the dark green radar screen, they can always observe foreign aircraft approaching their sacred territory. In addition to being amazed, they awarded the main person in charge and technical experts of the "Skeeter" company a high honorary award, and provided favorable conditions for the development and growth of the company, and "Skeeter" reciprocated the favor by constantly improving and upgrading the radar product technology, the time for radar detection to be affected by the weather has been continuously reduced, the ability to resist external interference has been continuously enhanced, and various products have also been sold to Switzerland, Spain and a few other countries without infringing on the interests of Sweden. On the evening of June 5, 1947, the Gävle ground-based radar warning station.

"Hey guys, come and see! An amazing spectacle that is rare in 100 years! In front of the steel guard door of the radar control room, the captain officer in the Swedish military uniform shouted to his colleagues who were sweating on the basketball court. Although they have been out of war for more than 130 years, as descendants of Vikings, these guys were born with aggressive blood, but now they have changed to a cathartic way.

Taking advantage of the distraction of the two defenders, the tall young man who controlled the ball easily shot and hit, he grinned brightly: "Brother Seta, don't interfere with the birds in the end!" ”

As soon as they heard this, several young soldiers who were about to take their clothes and go to the radar control room stopped in unison. In the face of doubts, the captain officer confidently said: "This situation was possible a month ago, but our radar has been changed to the latest Skeeter IP" will never confuse a flock of birds and a flock of aircraft within a hundred kilometers. ”

The tall young man crossed his waist on the spot: "Are you sure?" ”

"Believe it or not!" The captain turned around and walked away, and the good deeds on the basketball court were soon gone, and the tall young man habitually bit the metal card in his mouth, and casually walked under the basketball hoop and picked up the vest and coat, and the epaulettes were decorated with two beautiful captain's stars.

When Lieutenant Heile Dastenmann, the basketball star of the barracks, walked into the radar control room, the air was already filled with the smell of sweat, and more than two dozen Swedish soldiers gathered in front of two radar screens that were not yet the size of a pot. Every time the light bar is swept, there will be dense small spots of light on the green screen, and unlike the previous dotted light spots, they can vaguely see the outline of the plane, like the best-selling airplane biscuits in children's stores. …,

Someone sighed: "Oh my God, how many are there in this batch?" ”

Immediately, someone expressed his speculation: "It is estimated that there must be one or two thousand!" ”

The rebutter said, "Blow! There are not so many planes in the whole of Scandina, and even if there are, there are not enough runways for them to take off in the same batch! ”

The former defended: "There was no before, and who can say that there is no now?" With the brute strength of American cowboys, it is not surprising that thirty or forty airports are launched in a week! ”

Someone else retorted: "Nonsense! We received the order only the day before yesterday, and the secret treaty was signed four or five days ago at most, so it is possible that the Americans will be able to bring in enough bulldozers and rollers in three days, and they will not be able to blow up mountains and fill holes day and night to make enough airfields.9"

Captain Alexandersen, who had previously beckoned everyone to come and "watch", stopped the argument among his colleagues: "I said guys, your argument is indeed very gracious, judging from our experience, there are at most more than 300 planes here. Lieutenant Stenmann, you said that it should be more than enough for these planes to take off in the same batch at the airfields around the Norwegian capital, right? ”

Some people only noticed at this time that Lieutenant Stenman, who had just been chattering outside, had come in, and the "basketball star" just let out a faint "uh-huh" sound.

Captain Alexanderson then added: "This is really a dense group, it must be a spectacular sight, their route should pass near Stockholm, just north of the city people have eyes!" ”

"I don't think so." Lieutenant Stenmann still said in a faint tone, "Looking at the clouds in the south, it should be less than three thousand meters high, and the American and British planes are used to flying above four thousand meters, and in Stockholm, it is estimated that only the boundless roar can be heard, but no trace of the planes can be seen." ”

Captain Alexanderson immediately praised: "Sure enough! ”

"It's better to carefully count how many planes there are in this group and guess how many of them will be able to return." Lieutenant Stenman tepidly suggested that the people next to him thought it was just a joke, and did not want the captain to quickly reply: "I guess ninety percent of the planes will be able to return, with a loss of about five percent."

For a fleet of this size, five percent losses are quite impressive, considering that by the end of World War II, the loss rate of Allied bombers bombing Germany had dropped to 2 gills, and today's Soviet Air Force does not seem to be better than the Luftwaffe in its ability to resist the strategic bombing of Western Allies.

Sternmann changed his tone and said categorically: "Fifteen percent, at least." ”

Everyone gasped when they heard this, the difference of 10 percent may not be directly visible on the radar screen, but it means that thirty or forty heavy bombers have been shot down. Even in terms of the defensive firepower and survivability of the Gate, such a result would require an astonishing amount of conventional combat power, and the cost to the interceptors would have been staggering.

"Why do you say that?" Captain Alexanderson asked, counting on the radar screen with a ruler.

"Intuition." Sternmann replied that the two of them were now the protagonists of the place. From this point of view, Alexanderson's previous standing at the door to greet his colleagues was not entirely selfless sharing, but rather that a lonely life needed an opponent.

The captain stared intently at the screen, and while counting, he could still distract himself from talking: "How about a game of gambling and betting on your Noza motorcycle?" ”

"Okay, you've been coveting her for a long time anyway." Sternmann replied solemnly, "If I win, you will be on duty for me for a week, and I will go on vacation." ”

"Deal!" The captain clapped his head, and soon, he reported the estimate: "Three hundred and twenty to three hundred and fifty, and the speed is about three hundred and fifty kilometers per hour." ”…,

"Let's go, guys, just eat, it won't take at least three hours for the case to be revealed." Sternmann reverted to that nonchalant tone.

The "basketball star" walked out of the radar control room with his head held high, some people left, others still staring at the monotonous images on the screen, and Alexanderson couldn't stop touching his chin, as if he was mentally simulating an air battle that was about to break out. From a technical point of view, rocket or jet-powered fighters similar to the Air Force of the Third Reich were the best choice for daytime interception. Two years later, the Soviets are facing a similar problem, with rear industrial production greatly affected by the Allied blockade and bombing, and although several major battles have been won by the excellent performance of the ground forces, the consumption of the air force's fresh force far exceeds the rate of replenishment, and the development of jet fighters based on German technology has been successful, Yakzhan and MiG also appeared on the battlefield one after another, but their numbers were not enough to affect an aerial battle.

Half an hour later, the number of flares on the radar screen began to decrease, and the number of onlookers who came to the radar control room continued to decrease. When the spots of light had completely disappeared, Captain Alexandsson got up and looked at the empty room, and although the order of the Ministry of Defense reflected the change in Sweden's stance on the war, few of his colleagues felt that their country would be officially involved in the war. According to statistics, more than 2 million German troops transited Sweden during World War II, and 100,000 wagons of war materials were transported through the Swedish railways, but this did not fundamentally change Sweden's neutral nature, and the Allies did not pursue this matter after the war.

After reporting the detection of the radar station to his superiors again, Captain Alexanderson was thinking about whether he should also go to dinner and come back to stare at the radar, when the operator, who was always facing the radar screen, said indifferently: "High-speed flying objects have been detected in the north, is the data of the mechanical calculator "PS kilometers per hour, or is it an old question?" ”

The so-called old problem refers to the fact that the Sketer radar system is susceptible to thunderstorm clouds in the summer and autumn, so that there are some obviously irrational detection results, which are later confirmed by Sketer technicians as false alarms. Over time, the Swedish military's radar operators became more accustomed to the situation, but Alexanderson was always skeptical of the Skeeter company's explanations, especially since he heard from some friends living in the north that residents often observed strange flying objects, which he increasingly felt was related to rumors about the advanced aircraft of the Third Reich. As for whether this technology was acquired by the Soviet Union after the war, or whether there were other circumstances, it is too difficult to find out the truth with the ability of an ordinary captain...... ）