Release that Witch

Gray Fort, no winter city.

The report on the war in Dagong Island and the situation of the wolf heart was sent to Roland in two days.

Compared with the previous letter from the North East Yong Night City to the winter without a winter, it takes a week. The speed of such communication cannot be said to be huge. Whether it's a short-distance courier for a flight messenger or a long-distance journey of a steamship day and night, it is now integrated into a messaging system. Every important message is equipped with a special boat or even a plane. The report was sent by Tilly.

"It’s hard for you." Roland asked for a chaotic drink, "Where is the situation better?"

"I don't know if I read the report?" Tilly took the cup and gave him a look. "Behaving so diligently, what are you guilty of? Are there any clues about my dedicated machine?"

"Oh..." came a laughter from the nightingale.

"How come, I have chosen the most suitable one from several programs. As long as Anna pulls out the air, I can start trial production immediately." Roland said quickly. "You also know that several projects have arrived recently. The most crucial step, she is really busy."

"Look at Anna's share, I won't care about you this time, my brother." Tilly took a drink and wiped her mouth and walked outside the office. "The Seagull is about to return, I will go back first." Empty Knight Academy."

"Don't stay one day?" He was a little surprised.

"There is no way, now the front line can threaten the Scorpio Lord only Seagull and Andrea, and ... I don't want to miss any chance of revenge." Tilly waved his hand against him. "So I am gone, brother."

Looking at the door that was re-covered, the nightingale sighed softly. "Everyone... is working hard."

If I can, I hope they work **** other aspects, not war. Roland’s thoughts floated like this, but he did not say that because before the end of the war of gods, no one could rest this burden until the fate of mankind was decided. It is no longer meaningful to say that this is in addition to evading responsibility.

After a moment of silence, he opened the report seal.

After reading all the reports, Roland finally understood the meaning of Tilly's sentence. Can promptly issue the retreat order, and successfully ambushed a demon in the sea, no trace of the devil, the king, Itis Kant and Andrea is undoubtedly the biggest hero of this battle. But in the same way, the sender of the key intelligence can not ignore the desperation of not having this person, and will not be the victory behind.

"What are you going to do?" This incident obviously attracted the attention of the nightingale.

"No matter what the original intention of sending out this secret letter, his name and merits should not be forgotten." Roland said. If it is a past life, it is almost impossible to find an unidentified eyeliner after the end of the long war. I am afraid that the tombstone will only leave something like "Your name is unknown, and your merits will last forever." Inscription. But the witch can change this lasting situation, so that every soldier who contributes to the fate of mankind can stay in the history. "When the Yongdong Kingdom returns to the control of the First Army, let "black money" cooperate with Axia to confirm his identity and origin. ”

If the murderer who killed him was still alive at that time, he would not escape the severe punishment of the law.

The nocturnal nodded. "If you said that the equipment that can communicate over a thousand miles can be made early."

"It's a pity that it is not my strength." Roland couldn't help but lick his forehead, and when he thought of the circuit diagram that was forcibly memorized, he felt a headache.

"Now you can finally understand the feelings of my exams." The nightingale covered his mouth.

"But even if it's hard, I won't fall asleep on the table like someone, and I can only hand in a white roll," Roland glanced at her. "In fact, I'm almost finished making the prototype." ”

That's right, although the progress is extremely slow, the radio project has not stopped.

Like the piston machine, after considering the numerous options of the Grey House Design Bureau, he decided to select two of them simultaneously.

The two are spark transmitters and AM transmitters.

The former is the originator of radio waves, the structure is extremely simple, there is no electronic original, just use the transformer coil to raise the voltage to charge the capacitor, until the voltage between the capacitors is high enough to penetrate the air, and then discharge the electricity. spark. This part is quite like a lighter, except that the current passed by the spark is not wasted, but it is repeatedly oscillated between the capacitor and the inductor to generate electromagnetic waves, and finally the antenna is broken through the antenna.

In other words, as long as the control power is turned on and off, an intermittent electromagnetic break can be issued to the listener to translate the corresponding signal according to the length of the sound. The so-called long and short telegraph code is the result.

Although it still sounds a bit confusing, Roland has adopted the most tricky method, which is to let the gray project team of the Gray Castle Design Bureau use the materials that are readily available to create a real object that can be used, and then take the physical object.

For example, two pieces of tin foil are sandwiched on a stack of oil paper and sealed with wax, which is a simple high-voltage capacitor.

The inductance is even simpler, it is nothing more than wrapping a circle of wires around the insulating tube.

These devices can be completed on their own without considering mass production or specification. Although they are thick and simplistic compared to industrial products that are only nail-sized after packaging, the effect is basically the same. When the tower is built, he can try the first wireless reporting test of this era.

However, the shortcomings of the spark transmitter are also obvious.

Even if it passes the test, if you want to put it into formal use, you have to design a code that matches the kingdom's text. It takes a lot of time for the sender and receiver to train. In addition, the spark transmitter has a very wide spectrum, and only one transmitter can work in the same range, which is not suitable for frontline intelligence personnel.

Therefore, his ultimate goal is still an amplitude modulation transmitter that uses a tube to amplify the signal.

The biggest advantage of the latter is the ability to directly propagate voice signals.

In principle, radio communication and telephone are essentially similar in that they convert sound oscillation into current or electromagnetic wave changes, and after long-distance transmission to the other end, they are converted into sound again. Only the human audio frequency is too low, so that the wavelength of the signal wave is too long, and the longer the wavelength, the larger the size of the required antenna. If the voice signal is directly transmitted, the antenna length may be more than 100 kilometers, which is engineering. An impossible thing to achieve.

So if you want to pass the voice out, you have to take a higher frequency carrier.

This is the so-called modulation.

After the new waveforms of the two are accepted, the listener must also filter the high-frequency waves through a series of demodulation methods, leaving only meaningful low-frequency waves to be converted into the final speech.

Once the AM transmitter is successful, both the First Army and the intelligence agencies will have real-time communication capabilities.

For war, its meaning is self-evident.