My German Empire

Submarine, as the core of underwater power, often unfolded and contends with strong enemies under the seemingly calm sea.

However, this also led to a very obvious issue.

It is necessary to know that sea water is equivalent to a huge conductor, there is a good electromagnetic shielding effect. Therefore, underwater, submarines are less than any TV signal, mobile phone signal, wireless network signal, or most military radio station communication.

So how do you keep in touch with your headquarters? Connect and send text?

This is a dead road in the late World War I, as long as one floating, the submarine has a lot of probability to be on the murder.

Therefore, the communication problem of submarines has become a worldwide problem.

At the beginning of the submarine, it became an independent combat force. In order to solve the communication problem of the submarine, the Navy's Navy will take the water-based warship escorted by the submarine as a relay information station. After transmitting the information to the waterfall boat, then by the battleship Hitting the means to eject a sound under water and receive it through the sonar on the submarine. This means is gradually being discarded after a war after the distortion rate is high and there is almost no confidentiality.

There is also a method of sending information through radio float, but the submarine needs to remain relatively stationary in the ocean, and then transmits the buoy to the sea through the wire and the buoy of the communication device, and then receives the radio signal by the buoy.

This device solves the problem of submarines and external communication, but still significantly limit: submarines need to remain suspend underwater, so it is easier to discover and attack, which reduces the survival of the submarine. In addition, the radio float is relatively fragile, and it may be damaged in harsh environments.

The end of the Second World War II discovered a way to allow the submarine to receive communication under water: Long Baotai.

The absorption of the sea water on electromagnetic wave energy is very strong, but it is different for electromagnetic waves of different wavelengths. The shorter wavelength, the higher the frequency, the worse the attenuation in the sea water. However, the wavelength is longer electromagnetic wave, which can be slightly penetrated a little sea water. The longer the wavelength, the stronger the penetration of electromagnetic waves. Very long wave and ultra-long wave radio sending signals can enter in water for dozens of meters to more than 100 meters.

The long wave is a collective, in fact, the wavelength is called long wave at 1000 ~ 10,000 meters, and the electromagnetic wave of 100,000 meters to 1 million meters is called very wave, and the electromagnetic wave of 1 million meters to 10 million meters (10,000 kilometers) is called ultra-long wave. .

Very long wave radio can penetrate more than 20 meters of seawater, the German Navy has begun to engage in very long wave communications systems at the end of the World War II. The submarine does not need to float, and the inner wave of the headquarters can be accepted in the depth of the eye. Just the depth of the impeachment is not safe enough for the submarine.

Ultra-long wave radio can penetrate 100 meters deep seawater, this depth is also a sailing depth of normal submarine war.

Therefore, people collectively referred to, in fact, most commonly used, ultra-wave radio.

What is the problem is that it is not a small project, how old is the antenna of Changbo Terra?

It can only be said to be a big, very huge thing; you built a more than 100 meters high tower, which is just a small part of the long Baodai antenna!

Long Baodai's antenna is too long, so it is not vertical, but "lying". The role of more than 100 meters high, is to isolate the antenna body as much as possible, avoiding the transmission of geotextile interference when the Long Baotai is reported.

The United States built a long wave station in 1986, which consists of two parts, part in Wisconsin, and the other is 258 kilometers away from Michigan, and two parts can be jointly work. Its antenna has a total length of 135 kilometers, a total of 8 people, half work, half alternate, a total power 5. 28 MW.

135 kilometers, I have to drive for more than an hour.

Why is so long ... Because the radio wave sent by the long wave Table, the wavelength is very long; the length of the antenna is generally one of the integers of the wavelength, and the length of the antenna is related to the quality of the signal.

The ultra-long wave radio of 1000 kilometers, usually uses a 1/8 wavelength antenna, that is, the antenna length is ... 1000 ÷ 8 = 125 km. If the antenna used with 1/16 wavelength is not, but the signal quality is not so high.

Yaki is hesitation and then agreed to build a long wave station.

At this point, the German submarine from the Northern Atlantic, received the telegram from the Wolf Square Command.

"The boat is long! The headquarters calls, and found the prey."

The boat is over the telegram, looked at it, and his eyes lit. "There are nearly two hundred ship ships? It's a big guy." In the air chart, the distance is contracted, and I have observed some four weeks before the vision. "Floating! Advance!" The place where they are now is far away, and underwater sailing is definitely can't.

As bursts, the submarine slowly surfaced the water, and as the waves on the sea rocks, there is a volvence.

"Pay attention to the warning!"

A sailor to unscrew the hatch of the ship, the residual sea water is wrapped in a fierce sea breeze, and the people around them are cold. The submarine internal due to power and mechanical equipment, maintained a high temperature above 30 degrees, which is like hot Sahara desert.

The sailors put on the cold coat, climbed out of the ladder to the deck, while smoking the surrounding season.

And a refined sea breeze pushed into the submarine, swept away from the internal unnecessary smell of the submarine.

The submarines during World War II have no advanced air filtering devices in the later generation, and their internal smell is quite unpleasant. The odor produced by the diesel engine, the smell of the rotten food produced, the odor of the toilet and the sweat on the boat ... This is not difficult to understand why the ancient dragon perfume is popular on the German u-type submarine.

"It's so cold!" Submarine motivation cabin two shirtless sailors slammed, and hurriedly founded clothes.

The high belief and fighting spirit of the German Naval Submarine Force is the basis for maintaining its high level of self-discipline and mutual trust relationship. In this case, military discipline itself is often not so important. Some German boats that are strictly known as discipline also have a relatively loose scale on the execution of discipline on the boat.

German Naval Submarine Boats' combat is originally a traditional navy blue uniform, but it is uncomfortable in a small space in the submarine. So, in most German boats, as long as the boat can effectively implement combat mission and high competency, you can choose your own wear.