"Today, we continue to study the communication class. The main purpose of the pen is to learn www.biquge.info the operation, use and maintenance of the following radio stations", the instructor of the communication class, standing on the podium and starting the opening remarks of the communication class.

"Speaking of communication, everyone knows better, in the movie "Children of Heroes", Wang Cheng, before the sacrifice, held the microphone and shouted, 'Fire at me'. At that time, he was a signal soldier, and he used the radio to summon artillery fire, so that the enemy who had ascended the position would die with him. ”

"The radio he used was the same as the one he used.

Radio is a means of communication, and it is only in modern times that he has appeared.

In ancient times, there were many ways to communicate.

For example, there is an idiom called 'Hongyan Chuanshu', which says that the ancients wrote information on paper or market slips, and then used Hongyan or pigeons to deliver the message.

There is also a post station, which uses a fast horse to transmit news from one post station to the next.

There is another kind, which everyone has heard of. During the Zhou Dynasty, there was a story called 'The Princes of the Beacon Opera'.

It is about King Zhou You, in order to please his favorite concubine ---- the favor of his concubine, he lit the beacon tower on the city tower. When the princes saw the wolf smoke rising everywhere, they thought that the royal family was attacked by Xirong, so they sent troops everywhere to serve the king. And when they arrived, they found that there was no enemy at all.

At this time, King Zhou Youyou smiled and said to them, I'm joking with you. And Bao Xi, looking at the appearance of thousands of troops and horses coming from all directions, but being sent back by King Zhou You's words, laughed.

King Zhou You, seeing that Bao Xi liked this method very much, and after a few days, he used the way of lighting a beacon fire to trick the princes of the Quartet into escorting him.

One day, when the real enemy came, King Zhou You lit a beacon fire again. And the princes, thinking that he was joking again, no one came to save him, and in this way, he was captured, and the Western Zhou perished. ”

As you can see, there is one thing in common in the above examples: that is, information is disseminated by wild geese, flying pigeons, fast horses, beacons, etc.

With the development of the times, radio waves are also used to transmit information.

And the device that receives and transmits it is the radio.

You see, this is the 998 type radio station commonly used by our grassroots troops.

Its basic tactical and technical performance is as follows: Model, Type 998 Continuous Radio. Full combat weight, 10.5 kg. Frequency, from 3 MHz to 30 MHz. Power, 150 watts, communication distance, 15 km. ”

"First, let's review the principles of communication." The coach said.

The students listened attentively to the instructor's lecture.

"Start by reviewing a few basic terms. The first question, what are electromagnetic waves? ”

"Report, I'll answer! Electromagnetic waves, which are formed by coupling the time-varying electric field and the time-varying magnetic field and propagating forward at a certain speed, are called electromagnetic waves, referred to as radio waves. One of the students raised his hand and replied.

"The second question, what is frequency and what is its basic unit?"

"Frequency is the number of times an electromagnetic wave oscillates per second, and its basic unit is hertz."

"The third question, what is electromagnetic wave propagation?"

"Electromagnetic wave propagation is the process of electromagnetic wave movement generated by electromagnetic radiation, which mainly includes line-of-sight propagation, ground wave propagation, sky wave propagation and scattering propagation."

"The fourth question, what is a wavelength?"

"Wavelength is the distance that an electromagnetic wave travels in an oscillation period, and the basic unit is the meter."

"The fifth question, what is the electromagnetic spectrum?"

"It is a spectrum formed by arranging electromagnetic waves in the order of wavelength or frequency."

"The sixth question, how is the frequency of electromagnetic waves divided?"

"Electromagnetic waves are divided into ultra-long waves, with wavelengths ranging from three to thirty kilohertz. Long wavelengths, wavelengths between thirty and three hundred kHz. Medium wavelength, wavelength between 300 and 3,000 kHz. Shortwave, wavelength between three and thirty MHz. Ultra-short wave, 30 to 300 MHz. Microwave, 300 mega to 3 giga. Infrared, 300 to 400 kilomegabits. visible light, 384,000 GHz to 769,000 GHz. Ultraviolet rays, 769,000 GHz to 300,000 kilohertz. X-rays from 300,000,000 kilojils to 50,000,000 kilojites. Gamma rays, above 1 million kilohertz.

"Question 7, what are the main advantages of groundwave propagation?"

"Basically not affected by meteorological conditions, less affected by the ionosphere, and the signal is relatively stable."

"Question eight, what are the characteristics of electromagnetic waves?"

"Electromagnetic waves have the characteristics of linear propagation, mutual interference, and diffusion. Properties of diffraction and refraction. ”

"The ninth question, what are the main applications of radio waves in the military?"

"Radio waves are militarily used mainly in the field of radio communications, communication countermeasures, radars, radar countermeasures."

In nine consecutive questions, the students answered them neatly, indicating that everyone had done their homework behind their backs.

"Before learning the structure of a radio station, we first have to learn communication files.

Everyone, comrades who have experience in sending telegrams, know that telegrams are transmitted through the combination of long and short signals, one long and one short, and so on.

And the radio is also based on the same principle as the telegraph. Mainly in the military, cryptographic communication is mainly used.

That is, both parties use the same set of communication passwords. Then, the content of the communication, in numbers, is expressed. The purpose of exchanging information, conveying orders, reporting situations, and so on has been achieved.

Usually, passwords are represented by Arabic numerals.

However, due to the difference in Arabic numerals, dialects throughout the country, the receiving and sending sides, due to the difference in accents, are prone to errors in communication reception. Therefore, in order to increase the accuracy of the communication, the reading of these Arabic numerals has been redefined.

This is Arabic numerals, do any students know, how to read these ten Arabic numerals in communication?

"Report, I'll answer." One of the cadets raised his hand.

"Okay, tell me how to read it?"

"Comrade teacher, I know, I saw it in the TV series, and I saw it in some police detective films, on the license plate, it was clearly written 001, but it was read as 'Dongdong waist', so 1 is read as waist, and 0 is read as a hole."

"Well, what you said is very right, but it's not comprehensive, do other students have anything to add?" The instructor asked again.

The following classmates, you look at me, I look at you, no one is IQ anymore.

"Arabic numerals are read from 0 to 9, and they are read in correspondence as follows: '0' as 'hole', '1' as 'waist', '2' as 'two', '3' as 'three', '4' as 'four', '5' as 'five', '6' as 'six', '7' as 'turn', '8' as 'eight', '9' as 'hook'." Seeing that the students didn't know, the instructor then explained.

"Everyone, please look at the communication document. The document is preceded by Arabic numerals, followed by the meaning of those numbers, as well as the call sign. The call sign, this is the code name given to each other by the two sides of the communication.

For example, the company commander's code name is the Yangtze River, and the battalion commander's code name is the Yellow River. Then, if the company commander was to report to the battalion commander, I had arrived at the designated area. This sentence is replaced by a secret language: Yellow River, I am the Yangtze River, I have 301. If someone doesn't have a codebook in their hand, they won't be able to understand the content of our communication right away, even if they hear it. “

"The morning class is here, and the next class is an outdoor class, the practical operation and use of the radio. Please prepare well in advance. Then, the instructor announced the end of the class.

The next day was the first bad weather that I encountered in the outdoor class since training.

God takes care of us, and there is basically no big rain and snow in outdoor classes in September and October.

In the morning, I carried the radio to the Higashiyama training ground.

"Next, we will conduct training on the actual operation and use of the radio. What we have in our hands is that we use the 998 radio station.

The operation of the radio station is mainly divided into the following steps.

The first thing to do is to install the antenna. It is to install the whip antenna on the interface of the radio station to increase the communication distance.

Then there's FM. It is to adjust the frequency knob of the radio station to the frequency required in the communication file.

The third step is tuning, that is, you will put on the headphones, hold the microphone, and then. Twist the adjustment knob to keep the radio on the right call.

The fourth step is to communicate according to the content of the communication document and the actual requirements.

In the last step, you must not forget to turn off the station, turn off the power, and remove the antenna.

After the instructor of the communication class finished explaining the essentials of the movement, he asked the college to divide into groups of two people and start talking training according to the prescribed frequency.

Yang Wenbin and Tian Liang were in a group.

The two of them are usually chronic, but in communication, they show a very tacit understanding.

At the beginning, Yang Wenbin served as the main stage, and Tian Liang served as the subordinate stage. At the request of the communication, the two initiated a conversation.

In the communication documents, the call sign of the main station is, the Yangtze River, and the call sign of the subordinate station is, the Yellow River.

"The Yellow River, I am the Yangtze River, received an answer." Yang Wenbin took the lead in initiating the conversation.

"Yellow River received."

"I have a newspaper here, pay attention to it." Yang Wenbin continued to speak.

"Please send it down."

In accordance with the requirements of the correspondence documents. Yang Wenbin continued,

"Header: ......, Number: ......, Level: ......, Secret Grade: ....... Content:....... “

Follow what is given in the communication document. Yang Wenbin sent it to Tianliang.

"Please give me a receipt."

"Give you a receipt: ......," Tian Liang said.

"Change the frequency", Yang Wenbin gave another order.

"Okay", according to the requirements of the communication document, Yang Wenbin and Tian Liang re-communicated according to the procedure just now.

After confirming that the information was complete, the two ended the call and turned off the radio.

After practicing like this, the two of them switched roles, Tian Liang served as the main stage, and Yang Wenbin served as the subordinate stage, and practiced again.

According to the operating procedures required by the instructor, I practiced it twice, and the sparse drizzle began to fall.

The clothes gradually became wet, and a thin layer of water had accumulated on the surface of the radio, the jacket, and the Maza bench.

No umbrella, no raincoat, just staring dryly at it all being drenched in the rain.

The Army Academy's style of "sitting still for two hours and standing for an hour without falling" was something I had heard about when I first arrived at the army, and I have only now come to appreciate it.

Not long after, with the whistle of the captain of the duty area, the trainees finally packed up and prepared to return. The rain is still falling, and there is no sign of abating.

The coat that rushed to the direction of the rain was almost soaked, carrying a 10-pound radio station on his back, holding a horse stool in his left hand and a notebook in his right hand.

As the weather gets colder, tactics classes are about to begin. Wearing winter clothes and rolling in the mountains and wilderness, the degree of hardship can be imagined.

Encountering rain during training is just a trivial matter, and this is just the beginning.

If you pull it out to fight the flood and rescue it, this little thing can only be a big difficulty and the most basic subject. We should be mentally prepared to meet and overcome greater difficulties.