Siheyuan: I eat melons while doing scientific research

Chapter 1213 compressed into 1 day! (4k, 5k left around midnight)

As soon as the young man opened his mouth, everyone present was moved.

Gao Zhendong immediately realized what this might be. He raised his hand and said, "Little comrade, please stop talking. I will take you to where you should go right away! There you can tell me everything you know!"

The boy was very sensible and stopped talking immediately. He just looked at Gao Zhendong excitedly.

He could understand this. The word "comrade" had been in use for a long time, and it was even limited to our side.

"Little comrade", Gao Zhendong felt that this was the greatest respect for this young man and the comrades behind him.

Gao Zhendong shook Lou Shouxing's hand very solemnly: "Comrade Shouxing, thank you!"

Let’s put the uncle and the like aside for now.

Gao Zhendong couldn't make Lou Shouxing happy. His brother-in-law was always serious, but there was always a hint of humor in his seriousness. Today he was too serious.

For a moment, Lou Shouxing was at a loss, but there was also a little excitement in his panic.

"Zhendong, this... this..."

"This is what he should do!" Lou's father said behind his back. This boy is still not up to the standard of a serious occasion. He is still a little inferior to his son-in-law.

Gao Zhendong said to Father Lou, "Dad, I have to leave right away. Don't worry about me eating or anything like that."

Father Lou knew this was an inevitable result from Gao Zhendong's performance just now. He nodded and said, "Go ahead! Business is more important."

Gao Zhendong called Xie Jianye and two comrades: "Let's go, take this young comrade with us, let's go to the Defense Working Committee!"

Gao Zhendong was familiar with many units in the army, but there were not many suitable ones to take the child there. However, Gao Zhendong knew a way, which was to directly find someone with a high enough position. It didn't matter whether he was responsible for this kind of work or not.

This is called "entering the net", just like some people who want to have children pray to Guanyin, while others pray to Guan Erye. Once entering the net, the news can be transmitted to where it should go.

Not long after, after listening to Gao Zhendong's brief account, the leader of the Defense Work Committee suddenly fixed his eyes and said, "Where is this young comrade? Take me to see him immediately!"

There is a big difference between going to see him instead of inviting him over.

"I'm waiting outside." Gao Zhendong knew that this was a serious matter, so he didn't say much, but took the leader out directly.

Gao Zhendong had no idea what happened next. Things on this front were not within his business scope, and it was inappropriate for him to even inquire about them.

A day later, Gao Zhendong received a call from the leader of the Defense Work Committee, asking him to visit the committee.

"Leader, what's so urgent?" Gao Zhendong asked with a smile.

The leader of the Defense Work Committee looked serious and visibly sad.

"The young comrade your eldest brother-in-law brought back from Hong Kong Island brought back some very sad news. Most of our organizations in Danggui Province were sacrificed due to the betrayal of the leader. The young comrade brought back a small part of the list. Although it is incomplete, it can confirm the information we have. This list also let us know the real reason why the comrades lost contact and clarified other speculations."

This incident was only reported decades later when a surviving comrade brought back an incomplete list of only about 100 people under the pretext of returning home to visit relatives. The comrade did not know the names of more people, after all, he could not know the identities of everyone, and the one who knew the identities of everyone betrayed.

Gao Zhendong knew what was going on. In terms of the entire development context, he even knew it better than anyone else here.

However, the Defense Work Committee did not know that he knew about it, so they specially invited him over to inform him of the situation.

After all, he was the one who brought the person here, and there was no need to hide this matter from Gao Zhendong as long as the details were not involved. After all, from an administrative point of view, Gao Zhendong was able to get close to senior cadres and he could understand some situations.

Gao Zhendong nodded silently: "I roughly guessed it yesterday, but I didn't expect the situation to be so serious."

In fact, he knew how serious the matter was, even better than all his comrades. However, this incident happened too early, earlier than the year he traveled through time, and he could not change anything.

The leaders of the Defense Work Committee were not surprised by this. There was no need to prove how smart Gao Zhendong was. And it was normal for him to guess something based on what the young comrade said when he saw him yesterday.

The two were silent for a while, as if they were mourning for their sacrificed comrades.

After a long while, the leader raised his head and said, "I asked you to come here not only to inform you of this matter, but also to ask for your opinion on something else."

Gao Zhendong nodded: "Leader, please speak."

"Is there a way to basically guarantee communication at any distance? The communication equipment must be well concealed, the working conditions must be low, and the preparation work must be simple." the leader asked.

Are you looking for your cell phone? Gao Zhendong thought.

But it certainly cannot be this thing. The communication distance of a mobile phone is actually not far. The real reason why it seems to be everywhere is the huge backbone communication network behind the mobile phone base stations. At this point, leaving aside the technical difficulty, it is useless to just make a mobile phone.

Gao Zhendong knew why there was such a sudden demand.

He thought for a moment and asked, "Does it have to be maintained at all times or only during a certain period of time during the day?"

"It's enough to be able to arrive at a certain time. There's no need to guarantee that you can make calls at any time like a radio station, and you don't necessarily need to reply immediately after receiving a message. What you need is to establish a reliable communication channel."

Following his leader's words, Gao Zhendong understood more and more what this thing was used for.

"The Military Communications Institute should be more clear about this matter, right?" Gao Zhendong was a little surprised. It was obvious that this matter was related to the Military Communications Institute.

"I've asked, and they can't think of a good solution. Everything else is easy, but the two problems of concealment and working conditions are difficult to solve." As for the radio itself, it can meet this requirement, but radio stations these days are not small, and the requirements for working environment conditions such as antennas, weather, and location are not low, and they are too big.

If it is in an environment where it can be used publicly, then it is not a problem.

But for the expected working environment of this thing, each of these is fatal. The first problem is that this thing cannot be delivered to the hands of users. Especially when this question is asked now, its purpose and target are very clear.

It’s too big!
The key point is that what is important about this device is not receiving, but sending.

If you just want to receive, you can learn from the first radio warrior in Siheyuan - Liu Haizhong. The whole radio can solve the problem by listening to the broadcast. After all, the radio station is on your own land and does not need to be hidden. Just increase the power and work hard to make miracles happen.

But it is difficult to send the message out.

The difficulty of communication at that time is hard for ordinary people to imagine. When that incident happened there, because of the severed communication, we didn’t know what was going on for decades.

Gao Zhendong knew the ins and outs of this, and thought for a moment: "Using airplanes to relay in the air is the simplest method, but it requires coordination and cooperation, and the airplanes need to move forward as much as possible."

The leader of the Defense Work Committee shook his head and said, "This may not be appropriate. It can easily lead to misjudgment. After all, there is no need to be so nervous every day unless it is necessary."

Gao Zhendong nodded and understood. It seemed that the goal was clearer.

If this is the case, then using electronic reconnaissance ships or the like for relaying is also not feasible. It would be worse to use airplanes in the air, because at least airplanes are high enough and the environmental conditions for communication are not so demanding.

Well, since these are not convenient, I have no choice but to use the ultimate weapon.

"The only option is to send a satellite up there."

"Satellite??!!!" The leader of the Defense Work Committee was stunned. Damn, you are a bit too generous. In fact, if you have to say that the money is spent, it is not particularly exaggerated, but the level of this communication method sounds a bit surprising to people of this era.

Not to mention now, even decades later, by the time Gao Zhendong traveled through time, satellite communications had only been popularized among ordinary people for a few years.

"Yes, a satellite. This thing is not sensitive and will not cause any sensitive situation. Ordinary people cannot find it. To put it bluntly, even if they find it, ordinary forces do not have the ability to shoot it down, even though they know that this thing is clearly circling over their heads."

Gao Zhendong's description made the leader laugh, it's true.

"I understand what you mean, but is this method reliable?"

"It's reliable, but it takes a little time to get the communication equipment. There's nothing we can do about it. It always takes time and a process."

“Can communication equipment be made that small?”

"In fact, in terms of distance, even if the most improvised method is used, the distance between the satellite and the communication terminal is farther than the distance on land. However, the advantage of satellites is that they are high up, and the transmission conditions are different from those of ground waves and sky waves. Some things can be solved..."

At this time, if we want to use the synchronous orbit for communication, the distance is really far. The distance of 3.6 kilometers puts really high requirements on communication equipment. As a result, the size of the communication equipment has increased again.

Therefore, the only orbit that can be considered is similar to the orbit of future space stations. A low-eccentricity orbit at an altitude of about 350 to 500 kilometers is the most suitable.

Using the time when a satellite passes over a certain point for communication is possible even under current technical conditions, and the equipment can be made relatively small.

"However, with current technical conditions, there is a problem, that is, the communication time is limited, and we cannot guarantee 24-hour coverage. In short, we need to wait for a long time, about 2 to 5 days, depending on the final orbital height. And the time available for each communication is relatively short. Of course, this is a theoretical calculation of the origin revisit, and it will be a little better in reality, but there is no essential difference, that is, the communication interval will not change."

This is related to the satellite's revisit time.

"An opportunity to communicate every 2-5 days? Great!" Gao Zhendong thought this parameter was not very good, but his leader thought it was beyond expectations. For comrades who are responsible for related work, being able to communicate with each other using ordinary paper letters is already an extremely convenient communication condition. This thing takes a lot of time, is much faster and more concealed than letters.

2 to 5 days, for this kind of special work, is no different from face-to-face communication, especially this time facing more severe, complex and strict working conditions and environment.

"Also, the communication channels and bandwidth of this method are limited and not very high. In layman's terms, the number of terminals that can be served and the amount of data transmitted in one visit are relatively limited."

"It doesn't matter if it's not high. There should be no problem in passing a note, right?" the leader said with a smile.

As long as we can establish a convenient way to contact you, it will be enough. This is not like writing a paper. There are not many people using this thing, and there are not that many things to publish.

At this point, the leader of the Defense Work Committee suddenly remembered something: "Then... can this thing be used in many places?"

Gao Zhendong nodded: "Yes, it can be used anywhere in the world, but the time interval is different and will be much higher. In addition, if you want to reduce the interval, you can launch more satellites and plan the orbits of the satellites. If the number is sufficient, theoretically it can be done 24 hours a day, but the cost is very high. It's so troublesome mainly because we can only use low-Earth orbit now. When the technology develops and we use synchronous orbit, there will be other ways."

Unlike communications over a certain place that can be immediately forwarded to the other side of the sea 200 kilometers away, if data is transmitted from any place to the country, it must first store the received data and then send it down when it passes over the receiving station. Fortunately, our country is vast and we can build multiple receiving stations, otherwise the time just to revisit the receiving station would be enough.

The leader of the Defense Work Committee immediately stopped feeling sleepy. He didn’t hear everything that was said afterwards. He only knew that this thing could send messages to his home within 2 to 5 days from anywhere, and increasing the number could shorten the interval.

"Do it, do it. You must do it. Plan the orbit of each satellite carefully. We will launch three satellites and shorten the communication interval to within 3 hours!" Before Gao Zhendong could say anything else, the leader decided the overall scale.

It always feels different when the news can be spread within a day.

Comrades who often formulate systems know that in terms of time, one day is a hurdle, three days is another, and the next is seven days and one month.

Gao Zhendong was naturally happy about this. Although the functions and performance of this very low-level "communication satellite" seemed very poor in the eyes of later generations, there was a world of difference between having it and not having it.

"Okay! Also, I have a few other ideas." Now that the matter has been brought up, why not make it bigger.

"Okay, then I'll call together the comrades working on satellites to come over in the next few days, and we'll discuss this in detail." The leader made the decision immediately.

(End of this chapter)