Battlefield Contractor

Five hours have passed, and the wind and waves on the sea are still calm, but the three assault boats will not last long on the sea.

If there is a bigger storm, Lin Rui and others are likely to die in the vast sea.

Especially the rescue team could not be contacted, this made everyone feel great pressure.

"Boss, it has been five or six hours since we left Wild Boar Island, not counting the communications we initiated before. The routine communications we initiated every hour have also been five times, but the rescue team still did not respond.

It was not just a rescue, the team did not respond. Our satellite phone is no longer working. I tried it just now, but I couldn't find the satellite signal. "Sausage reported to Lin Rui in a low voice.

Lin Rui raised his head and looked at the sky in the distance. It was still night when they fled from Wild Boar Island. But now the sky has begun to turn white, it is already five or six o'clock in the morning.

He nodded to the sausage, "I see."

Lin Rui turned his head and asked Kuaima, "Have you ever encountered this situation?"

"Are you talking about communication failure? It's commonplace in the mountains of Afghanistan. But I haven't encountered such a situation on the sea." Kuaima shook his head.

"Is it caused by the environment?" Lin Rui asked in a low voice.

"It's hard to tell." Kuaima frowned. "Usually, the farthest communication distance is a straight and open area with no obstacles at sea level and land.

This is also the geographical condition that is usually used to evaluate the communication distance of wireless communication devices. Followed by semi-obstructed and semi-open environments such as suburban countryside, hills and riverbeds.

The closest communication distance is in the city buildings or in the mountains. In short, the denser the obstacles, the greater the impact on the wireless communication distance, especially metal objects. The loss of wireless signals in some common environments is not applicable to our current situation.

But obviously, the surrounding environment must have played a role. Otherwise, the microwave wireless signal cannot be connected, and the satellite signal should always be possible. "

"Damn, this is really bad luck." Lin Rui shook his head helplessly, and turned to ask the other mercenaries. "Who knows communication technology?"

"Don't ask me, I am radio blind, and I can't even play with the radio." Sergey stretched out his hands helplessly.

"I didn't ask you, who else understands?" Lin Rui shook his head.

"I've made some, but it's not professional." Blackbeard raised his hand.

"Then talk about your unprofessional opinions. We are now in a big trouble. Whether it is microwave wireless communication or satellite communication, there is a situation where it cannot be connected.

I have to know what is going on. Lin Rui shook his head.

Blackbeard thought for a while, "As far as I know, the electromagnetic environment has a great influence on communication. For example, DC motors, high-voltage power grids, switching power supplies, electric welding machines, high-frequency electronic equipment, computers, single-chip computers and other equipment have a strong The communication distance of communication equipment has varying degrees of influence.

There is also the climatic conditions. When the air is dry, the communication distance is longer, and the communication distance will be shorter in a humid air environment, especially in rain and snow.

Within the allowable ambient operating temperature range of communication products, an increase in temperature will reduce the transmission power and the reception sensitivity, thereby reducing the communication distance.

The last possibility is communication signal interference that is common in electronic countermeasures warfare. "

"But I feel that we are not in either situation now." Lin Rui shook his head and said, "Tell me if there is any way you can restore communication."

Blackbeard hesitated, "I'm afraid I don't have any good solutions. After all, I am not a communications professional, but I have only been in touch with it a little."

"That said, I need someone to advise me now. Otherwise, those of us will die at sea." Lin Rui sat on the inflatable boat, "This situation cannot continue. Our supplies are limited. , Even if we were not drowned, we would die of thirst and starve to death."

"Well, let me talk about my opinion." Blackbeard hesitated, "For wireless communication, the greater the transmission power, the greater the communication distance.

Theoretically speaking, the transmit power can be increased without limit, but in fact, due to cost or technical regulations, the output power of the transmitter is also limited.

In addition, the receiving sensitivity reflects the function of the receiver to capture weak signals. The higher the receiving sensitivity, the longer the communication distance.

Simply put, it is to enhance the transmitted signal and enhance the sensitivity of the received signal. "

Lin Rui shook his head, "It's up to you. Even I know this. What I want is a solution."

"I have an idea, I don't know if it is feasible?" Blackbeard hesitated, "Maybe we can try to add an antenna. Because the higher the antenna gain, the longer the communication distance.

When the transmitter uses a high-gain directional antenna, it can significantly increase the power density in the communication direction, and when the receiver uses a high-gain directional antenna, it can significantly improve the signal/noise ratio and increase the receiving field strength, thereby greatly increasing the communication distance .

I'm not sure if it is useful, but maybe we can give it a try. "

Sausage looked at Blackbeard and asked, "But there is no problem with the communicator's antenna. We just can't get in touch with the rescue team.

How can we increase the antenna in this case? "

"My idea is that we can manually make a high-gain directional antenna. In this way, maybe the signal gain can be 10-12dB.

And theoretically, the geometric size of the antenna with the higher the gain of this kind of antenna is also larger, especially the high-gain directional or omnidirectional antenna. "Blackbeard explained.

"Okay, I probably know what the directional omnidirectional antenna you said means. Just say what we should do?" Lin Rui looked at him.

"First we need metal." Blackbeard replied.

"Metal? Where can I get metal for you?" Lin Rui frowned.

"Then we have to find a way. We now have some steel cords, which may be available. But it is better to have metal plates.

To make a directional gain antenna, I need some metal plates. After some simple measurements, it may not be so accurate. But I might be able to make a prototype. "Blackbeard replied.

"Food cans. We have some food cans. The cans are metal products. Maybe you can provide the materials you want.

When I was very young, I saw someone use a can as an antenna to receive TV. I think maybe we can try this way too. "Eric raised his hand.

"These are totally different things." Blackbeard shook his head, "Also, a small metal can doesn't do much. I need a larger metal plate to make a directional gain antenna."