Bright Sword starts with the grenade flat.

Chapter 48 Radio Station Positioning Technology

However, it is useless for Liu Xiu to be powerful alone. After all, this battle is not a one-man game. It is like Liu Xiu, a king, with a few bronzes and little devils, who are all diamond-level players. Liu Xiu alone is not the best. I can’t carry it!

Liu Xiu's side was beaten back and forth, and two trenches were lost in the blink of an eye. But fortunately, just when the Little Devils Special Forces launched an attack on the third trench, they were suddenly stopped. The order to attack.

In the blink of an eye, the little devil who was still aggressive retreated completely.

When Liu Xiu saw this situation, he naturally understood that Li Yunlong had succeeded and knocked out the little Japanese observation group, so Yamamoto Kazuki chose to retreat because there was no audience.

So the beheading operation ended in an anticlimactic manner. Of course, although Li Yunlong killed the high-level observation group of the little devils and killed several big fish, because they disobeyed orders and divided the troops without authorization, the merits and demerits were offset. Rewards and no punishments.

However, although the above did not praise Li Yunlong, Li Yunlong still called Liu Xiu over and expressed his gratitude to Liu Xiu. In this defensive battle of Chenjiayu, Liu Xiu's thunder mix and his own marksmanship were all very good at stopping Xiao Xiu. The enemy's special forces attack.

However, Liu Xiu was not happy, but said seriously:
  "Captain, Zheng Wei, don't you think it's strange? Why do the little devil's special forces team know the location of the Eighth Route Commander so accurately?"

Li Yunlong said:

"What's so strange about this? There must be someone inside the commander!"

Liu Xiu shook his head and said:
  "The Eighth Route Commanders are all old comrades, and they must have done a good job in anti-molesting. Moreover, after learning the lesson from the last time, how could they make the second mistake again!"

Liu Xiu didn't intend to beat around the bush anymore and said directly:

"I think the Japs must have new technologies, such as radio positioning technology. After all, the difference between us and the Eighth Route Commander is that we don't have a radio station, and the Eighth Route Commander doesn't have a radio station!"

"Liu Xiu! Your guess is very reasonable, but we don't have conclusive evidence to prove that the little devil does have this kind of technology! Besides, even if we have this kind of technology, should our Eighth Route Commander abandon the radio station? No need?"

Liu Xiu really couldn't argue with Zhao Gang's words, but Liu Xiu also knew that it was because of this radio positioning technology that the senior commanders of the Eighth Route Army suffered a big loss.

According to the plot of Liangjian, the Little Japs will launch a large-scale raid next year, and the Eighth Route Commander lost a senior commander in vain because he did not realize that the Little Japs had radio positioning technology.

But now Liu Xiu is just saying that the Japs have radio positioning technology, and he won't let the Eighth Route Commander believe it!

In fact, the positioning technology of radio stations is still very simple. Positioning can be performed with two or more radio stations.

Because radio waves are emitted from a point in all directions, using the receiving antenna, the radio waves felt in that direction are the clearest, then that direction is the direction of the radio station.

The position of the radio station can be determined by using two radio stations in different locations. Of course, the more radio stations there are, the more accurate the measured position will be.

During World War II, German agents often used this method to find the telegraph agents from the Bear Country. However, such a secret that was not a secret caused the Eighth Route Command to suffer a big loss. It has to be said that it is not unreasonable to be beaten if the technology is lagging behind.

In fact, the use of antennas to measure the direction of electromagnetic waves was not unique to World War II. As early as 1888, when wireless telegraphy had not yet been invented, the famous scientist Heinrich Hertz used it in a series of experiments to confirm the existence of electromagnetic waves. A loop antenna is used. In the experiment, the loop antenna showed completely opposite directional characteristics to the dipole antenna. When the loop surface was parallel to the radio wave, the antenna received the strongest signal. When the loop surface was perpendicular to the radio wave, the antenna received the strongest signal. The signal strength is zero.

So by the beginning of the 20th century, people began to use the directional characteristics of loop antennas to locate radiation sources. Most of the early radio transmitters worked in the medium and long wavelength bands. Since longer wavelengths have less coupling with the earth, they are very suitable for long-distance propagation. Therefore, between 1900 and 1910, long-wave signal direction finding was One of the major projects in radio research. At the same time, the efficiency of the antenna also depends on the relationship between size and operating wavelength.

The length of most antennas is at least a quarter of the wavelength, and in practical applications, "half-wave dipoles" with dimensions up to half a wavelength are very common. To be successful in the long-wave band, the diameter of the loop antenna is often very large, and multiple loops are usually connected to enhance the signal.

However, the Eight-Road Command Banner has not yet understood the theoretical basis that existed decades ago. It was only after heavy losses that it noticed that there is such a method as radio positioning.

In the end, Liu Xiu decided to go to the county town first to find his father, who had studied at the Little Devil's School, and ask him if he knew about radio positioning technology.

It would be great if his father knew about it, so that he could remind the Eighth Route Army Commander in the name of his father Liu Qin.

After all, Liu Xiu is only ten years old now, and he is a soft-spoken person. If he relies on his father, who has an education background, he will no longer be a soft-spoken person.

Thinking of this, Liu Xiu immediately said to Li Yunlong and Zhao Gang:

"Captain, I want to go to the county town and ask my father if he knows about the kid's radio positioning technology! If there is such a technology, then we have to be careful!"

Neither Li Yunlong nor Zhao Gang stopped Liu Xiu's proposal, so Liu Xiu left the Independent Regiment's station and went to the county town to find his father Liu Qin.

Compared with being cautious the first time he came to the county town, Liu Xiu was much bolder the second time he came to the county town. He found the residence of his father Liu Qin very easily. I have to say that Liu Qin, who was a translator, was quite good at it. Not bad, you can actually create a separate place in this county.

When Liu Qin saw Liu Xiu coming, he immediately wanted to close the door nervously, but Liu Xiu stopped him.

After all, doesn’t this sudden closing mean that there are no three hundred taels of silver in this place?

"My son, why didn't you just stay here on Eighth Road and come to me?"

In response to Liu Qin's question, Liu Xiu immediately explained how the Japs' special forces accurately positioned themselves at the Eighth Route Command Column.

When Liu Qin heard Liu Xiu's words, he touched his chin and thought for a while before saying:
  "When I went to study abroad at Little Devil's place, I didn't learn anything about radio, but there is indeed a way to do the radio positioning you mentioned!"

(End of this chapter)