Mo Dahai stood in the corridor behind the cockpit and stared at the crew operating the machines to throw the fishing nets into the sea. Even though he had cooperated with the troops as a maritime militia many times, he was still in a surging mood at this time. Kitchen
This is in the Alasu Sea, which is the high seas.
This is the Qiongyu No. 588 steel fishing boat with a displacement of 1,130 tons, which is larger than the previous fishing boats that helped tow the target boat. The length is 63.8 meters, the width is 9.8 meters, the power reaches 1,600 kilowatts, and the speed reaches 16 knots.
You can't tell much by just looking at the data, but if you compare it with the equipment of the troops, it will be clear at a glance.
Ship No. 53 is 116 meters long, 12 meters wide, has a standard displacement of 2,300 tons, and has a endurance of 5,500 nautical miles at a speed of 16 knots.
In other words, the Qiongyu No. 588 steel fishing boat is almost half the size of the No. 53 ship. The key is speed!
Let’s look at its power. What is the concept of 1,600 kilowatts? The engine used in the Type 99A main battle tank has a maximum power of only 1,200 kilowatts...
The average fishing boat can run 12 knots at top speed, but the Qiongyu 588 can actually run 16 knots. In other words, this guy can keep up with the fleet in cruising state!
Qiongyu No. 588 is also equipped with advanced equipment such as a fish detector, Beidou navigation, safety net wireless phone, AIS automatic identification system, a daily 6-ton freshwater desalinator and its own refrigeration system, making it a powerful tool for offshore fishing.
In recent years, our country's fishery has developed rapidly. The previous wooden fishing boats and cement fishing boats have been eliminated at an accelerated pace, and have been replaced by fishing boats made of steel, iron shell, fiberglass, and aluminum alloy with larger tonnage, more advanced equipment, and more powerful horsepower.
.
Compared with Qiongyu No. 588, that fishing boat towing the shooting range is just a backward little man.
Because of the excellent performance of the ship, Li Hai gave Mo Dahai an important task - to set a deep-sea fishing net in the sea area considered to be the greatest threat to see if he could catch a big fish.
After Mo Dahai saw that the fishing nets were released, he quickly returned to the cockpit and personally steered the fishing boat to start the "fishing" operation.
At this time, on the bridge of the No. 53 ship, Li Hai ordered the correspondent to send a communication to the Great Wall 101, reminding the Great Wall 101 to pay attention to avoid several designated sea areas.
It is impossible to send a message to Great Wall No. 101 in submersible state. Without knowing the specific location of Great Wall No. 101, the message can only be sent to the transfer station, which will forward it to Great Wall No. 101.
How does the transfer station contact the submarine?
The communication difficulties of submarines have existed since its birth and continue to this day.
Everyone knows a story. The great leader *** once rejected Stalin's request to build a long-wave radio station in our country. This long-wave radio station was used to contact submarines.
The transmission distance of communication signals will be affected by the curvature of the earth, just like the radar waves emitted by radar.
Radio communication is achieved through electromagnetic waves. The transmission distance is related to the wavelength. According to the band classification, it is divided into very long wave, long wave, medium wave, short wave, ultra short wave, microwave, millimeter wave, etc. They work at different frequencies.
The operating distance is inversely proportional to the accuracy. Generally speaking, the longer the wavelength communication distance is, the less accurate it is. The shorter the wave, the higher the accuracy but the shorter the communication distance.
This is also the reason why submarines and land usually use long waves or even very long waves to communicate. However, under modern technical conditions, long wave communication can be done very accurately.
The radio stations used by squads, platoons, companies and individual soldiers emit short waves, which do not have high requirements for communication range, but high requirements for accuracy and efficiency.
In order to communicate with submarines and ships thousands of miles away, it is necessary to build a long-wave communication station on land. It is a big thing and is basically a communication base.
Due to the influence of the curvature of the earth, the higher the altitude of the long-wave radio station, the better. This is why the communication antenna on the ship must be arranged at the top of the mast, and it is also the reason why the sea warning radar on the ship is deployed on a relatively high base.
reason.
The People's Navy has built long-wave radio stations in the mountains in the north and south, thousands of kilometers away from the coastline. One side is for transmitting and the other side is for receiving. This is the submarine's clairvoyance and ears!
The communication information sent by the No. 53 ship first goes to the North and South Dashan long wave radio stations, and then is sent by the North and South Dashan long wave radio stations to the Great Wall No. 101, which is thousands of miles away.
The submarine will float up to receive communication information at a certain point in time according to the plan, or release a communication buoy to receive it, and in this way accept the command of the shore-based headquarters.
The communication between surface ships and shore bases and other ships is very troublesome. The communication between submarines and shore bases and other ships is even more troublesome. Moreover, the communication problems of submarines are more difficult to solve. Kitchen
The submarine is in a state of loss of contact while submerged.
Therefore, when it was reported that Russia had developed communication technology that allowed submarines to communicate with the surface while submerged, the whole world was shocked. However, it turned out to be just a concept and nothing substantial has been released yet.
The key lies in immaturity. Just like the submarine-launched anti-aircraft missile, it was also developed by the Soviet Union. It claims to be able to attack aircraft in the air without surfacing, and it has produced a real object and is said to be equipped with certain models of submarines.
, however, gradually no one mentioned this concept again.
Water is a powerful barrier, which is both an inherent advantage and an inherent flaw of submarines.
To this day, shore-based longwave radio stations are still indispensable and the only reliable means of shore-submersible communication.
Li Hai didn't know where the Great Wall No. 101 had wandered off. In the battle plan, the Great Wall No. 101 should be in the Sulawe Sea at this time, not the Arasu Sea, because everything the No. 53 ship had encountered and the actions taken had made the entire
The plan has changed. The Great Wall 101 should go to the sea area where the Sulawei Sea and the Alasu Sea meet to conduct patrols as planned.
But no one knows whether the Great Wall 101 has wandered into the Alasu Sea, or even wandered into the waters of Duolan Island.
However, Li Hai could not wait for the information about Great Wall No. 101. What was in front of him was to completely pick up the Haite team aboard the ship.
When the fishing boats began to pull the nets to search for submarines, Li Hai called the Haite team, but there was no reply after several minutes.
This is a normal phenomenon. The Haite team must be performing a secret combat mission. The failure to respond to communications in a timely manner is obviously limited by the environment at the time.
Five minutes later, Li Hai called for the second time.
However, once again there was no reply.
This is abnormal.
Chang Haizhou also realized something was wrong, frowned and said, "Chen Meng is a very reliable person. He has never been so procrastinating before."
"I'm worried it's not a matter of procrastination," Li Hai said solemnly.
He thought quickly and said to Song Jianming, "Navigator, look for the combat map of Duolan Island."
Song Jianming went immediately.
Li Hai took out the combat map of the Haite team, and after Song Jianming brought over a combat map of Dolan Island, he lay there and studied it.
Comparing the Dolan Island combat map with the combat schematic diagram of the Haite team, Li Hai soon found a point, pointed at it, and said, "According to the plan, the Haite team should have arrived twenty minutes ago.
At this point, there is a backup radio station here."
The implication is that if the radio is damaged, they will not lose the means of contact with the No. 53 ship. Now twenty minutes have passed. Either something happened to the Haite team, or they missed the point of obtaining the backup radio. At the same time, they and the No. 53 ship
The ship's communication radio is damaged.
The inability of the Dolphin carrier-based helicopter to take off indirectly brings about a huge problem - how to confirm the situation of the Haite team at this moment? Kitchen
