Battlefield Contract Worker
Chapter 5580: lost seas
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Five hours have passed, and the wind and waves on the sea are still calm, but the three assault boats can't support the sea for long.
If there is a bigger storm, Lin Rui and others are likely to be buried in this vast sea.
Especially not being able to contact the rescue team, this made everyone feel a lot of pressure.
"Boss, it's been five or six hours since we left Boar Island, not counting the communication we initiated before. The routine communication has been initiated five times every hour, but the rescue team still hasn't responded.
Not only the rescue, the team did not respond. Our satellite phone is also not working. I tried it just now and 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 escaped from Wild Boar Island. But now the sky has begun to turn white, it is already five or six in the morning.
He nodded to the sausage, "I see."
Lin Rui turned his head and asked Kuaima, "Have you ever encountered such a situation?"
"You mean the communication fails? It's commonplace in the mountains of Afghanistan. But I've never encountered such a situation on the sea." Kuima shook his head.
"Is it caused by environmental reasons?" Lin Rui asked in a low voice.
"It's hard to say." Kuaima frowned. "Usually, the farthest communication distance is straight and open areas where sea level and land are unobstructed.
This is also the geographic condition commonly used to evaluate the communication distance of wireless communication devices. Followed by semi-obstacle and semi-open environments such as suburban countryside, hills and riverbeds.
The closest communication distance is in urban buildings or mountains. In short, the denser the obstacles, the greater the impact on the wireless communication distance, especially the metal objects have the greatest impact. The loss of wireless signals in some common environments is not applicable to our current situation.
But it is clear that the surrounding environment must have played a role in some way. Otherwise, the microwave wireless signal cannot be connected, and the satellite signal should always be available. "
"Damn, this is really unfortunate." Lin Rui shook his head helplessly and turned to ask the other mercenaries. "Who knows communication technology?"
"Don't ask me, I'm radio blind, I can't even fiddle with the radio." Sergey spread his hands helplessly.
"I didn't ask you, who else knows?" Lin Rui shook his head.
"I've made some, but it's not professional." Blackbeard raised his hand.
"Then talk about your unprofessional opinion, we are in a big trouble now. Whether it is microwave wireless communication or satellite communication, there is a situation where it cannot be connected.
I have to know what the **** is going on. "Lin Rui shook his head.
Blackbeard thought for a while, "As far as I know, the electromagnetic environment has a great impact on communication. For example, near DC motors, high-voltage power grids, switching power supplies, electric welding machines, high-frequency electronic equipment, computers, microcontrollers and other equipment, wireless The communication distance of communication equipment has different degrees of influence.
In addition, there are climatic conditions. The communication distance is longer when the air is dry, and the communication distance is relatively short in the humid environment, especially in rainy and snowy weather.
Within the allowable ambient operating temperature range of communication products, the increase in temperature will reduce the transmit power and receive sensitivity, thereby reducing the communication distance.
The last possibility is the common communication signal interference in electronic countermeasures warfare. "
"But I feel that we are not in any situation now." Lin Rui shook his head and said, "Tell me how you can restore communication."
Blackbeard hesitated for a while, "I'm afraid I don't have a very good way. After all, I'm not a communications major, and I only have a little exposure."
"Then say, I need someone to advise me now. Otherwise, all of us will die at sea." Lin Rui sat on the inflatable boat, "This situation cannot continue. Our supplies are limited. , even if we didn't drown, we would die of thirst and starvation."
"Okay, let me tell you my opinion." Blackbeard hesitated, "For wireless communication, the greater the transmit power, the greater the communication distance.
Theoretically, the transmit power can be increased without limit, but in practice, the output power of the transmitter is limited due to cost or technical constraints.
In addition, the receiving sensitivity reflects the receiver's ability to capture weak signals. The higher the receiving sensitivity, the longer the communication distance.
Simply put, it is to enhance the transmit 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 gain of the antenna, the longer the communication distance.
When the transmitter adopts a high-gain directional antenna, the power density in the communication direction can be significantly improved, while when the receiver adopts a high-gain directional antenna, the signal/noise ratio can be significantly improved, and the receiving field strength can be greatly improved, thereby greatly increasing the communication distance. .
I'm not sure if it works, but maybe we can give it a try. "
Sausage looked at Blackbeard and asked, "But the communicator's antenna is fine. We just can't get in touch with the rescue team.
How can I increase the antenna in this case? "
"My idea is that we can make a high-gain directional antenna by hand. That way, maybe 10-12dB of signal gain.
And theoretically, the higher the antenna gain, the larger the geometric size of the antenna, especially the high-gain directional or omnidirectional antenna. ' explained Blackbeard.
"Okay, what kind of directional omni-directional antenna you said~www.readwn.com~ I probably know what it means. You just say what should we do?" Lin Rui looked at him.
"First we need metal," Blackbeard replied.
"Metal? Where can I get you metal?" Lin Rui frowned.
"Then we'll have to figure it out, we've got some soft wire rope now, maybe we can use it. But it's better to have sheet metal.
To make a directional gain antenna, I need some metal plates. After some simple measurements, it may not be able to be accurate. But I can probably make a prototype. "Blackbeard replied.
"Canned food, we have some canned food, the cans are metal products, maybe they can provide the material 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 that too. "Eric raised his hand.
"It's two different things." Blackbeard shook his head. "Besides, a small metal can won't do much. I need a larger sheet of metal to make a directional gain antenna."
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