Grey Fort, no winter city.

Reports of the Battle of Grand Duke and Wolves were sent to Roland two days later.

Compared with the letters that were sent from the northern eternal night city to the winterless, it took a week, and the speed of such a communication could not help but say that the progress was huge.Whether it’s a short-haul delivery of a flying messenger or a steamship’s long-distance journey day and night, it’s now part of a messaging system that’s every big piece of news coming with a special man on board, and even on a plane — and this time the report was sent by Tiri.

“It’s hard for you.”Roland asked the warm handed over the chaotic drink, "Is the situation over there okay?"

“Don’t you know the report?”Tilly took the glass and glanced at him, "acting so diligently, what are you in your heart?"Is my special machine not a clue?”

“Hang...” There was a nightingah behind him.

"Why, I have chosen the most suitable one from several schemes, and as soon as Anna draws the air, he can start the trial at once."Roland said, "You know, several projects have recently reached the most critical step, she is really busy."

"For Anna's sake, I won't care about you this time, brother."Tilie took a sip of her drink and wiped her mouth outside the office. "The Seagull is about to return, and I'll go back to the Knights Academy first."

“Don’t stay for a day?”He was a little surprised.

“No way, only the seagulls and Andreas who can threaten the Lord of the Dome on the front lines now, and ... I don’t want to miss any chance for revenge.”Tilly waved her back against him, "Then I'll go, brother."

Looking at the door of the room that was covered up again, the Nightinge gently sighed, "Everyone ... is trying."

If I could, I would prefer them to try in other ways than in war.Roland had such thoughts in his heart, but he did not say anything—because no one could rest on this burden until the battle for God’s will was over, and no one could rest until the fate of mankind was decided.Now it makes no sense to say this except to avoid responsibility.

After a moment's silence, he opened the report seal.

After reading all the reports, Roland finally understood the meaning of Tiley's sentence.Being able to give orders of retreat in time and successfully ambush a demon king who has gone nowhere in the vast sea, Edith Kant and Andrea are undoubtedly the greatest heroes of this battle.But again, the sender of that key intelligence cannot be ignored—without this man’s death, there would be no victory behind it.

“What are you going to do?”The incident also attracted the attention of the nightinge.

“No matter what the original intention of this letter, his name and merit should not be forgotten.”Roland whispered.If it is a past life, it is almost impossible to find an unidentified eyeliner after the end of the long war, and I am afraid that the tombstone can only leave an inscription similar to "Your name is unknown, your achievements will last forever."But the witch can change this last resort, so that every warrior who contributes to the fate of mankind can stay in history."When the kingdom of Yongdong returns to the control of the First Army, let the "black money" cooperate with Asha to confirm his identity and history."

If the murderer of his death was still alive at that time, he would not escape the severe punishment of the law.

The Nightinge nodded, "If only you had said that the kind of equipment that could communicate across thousands of miles would have been made early."

"Unfortunately, that's not what I've been for."Roland couldn't help but rub his forehead, and he felt a headache at the thought of forcibly remembering the circuit diagram.

"Now you can finally understand how I felt during the exam."The nightinge covered its mouth.

"But even if it were difficult, I wouldn't fall asleep on the table like someone else, and I'd just hand over a white roll," Roland glared at her. "In fact, I've almost finished the prototype."

Yes, despite the slow progress, the radio project has not stopped.

Like the piston machine, after considering the many plans of the Gray Fort Design Bureau, he decided to choose two of them at the same time.

The two are spark transmitters and amplitude-emitting transmitters.

The former is the originator of radio communication, the structure is extremely simple, there is no electronic original, just the use of the voltage coil to raise the voltage to charge the capacitor, until the capacitor load in the spark gap between the voltage is high enough to break through the air, and then release the spark.This part is quite like a lighter, but the current of the spark passing in the past is not wasted, but it repeatedly fluctuates between the capacitor and the inductor, so that it produces electromagnetic waves, and finally through the antenna, these electromagnetic waves are emitted.

In other words, as long as the control of the power supply is opened and closed, it can be issued intermittent electromagnetic rupture - the receiver can translate it into the corresponding signal according to the length of the sound.The so-called long and short telegraph code comes from this.

Although it still sounds a little confusing, Roland used the most convenient method, that is, let the Gray Fort Design Bureau's radio project team use the readily available materials to create a suitable object, and then copy the physical object.

For example, two pieces of tinfoil are clamped up and down on a stack of oil paper, and then sealed with wax, which is a simple high-pressure capacitor.

The inductance is more simple, nothing more than a ring and a circle of wires on the insulating tube.

These devices can be done on their own without considering mass production or specifications.Although they are both large and rudimentary compared to those industrial products that are only the size of nails after encapsulation, the effect is basically the same.When the tower was built, he could try the first wireless reporting test of his era.

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

Even if it passes the test, it will have to design a set of code that matches the Kingdom text if it is put into formal use, and the training of the whistleblower and receiver will take a long time.In addition, the spectrum of the spark sender is extremely wide, and only one sender can work in the same range, and it is not suitable for front-line intelligence personnel.

Therefore, his ultimate goal is still to use the amplification transmitter of the tube amplification signal.

The biggest advantage of the latter is that it can transmit voice signals directly.

From the principle alone, radio communication and telephone are extremely similar in nature, which converts the shock of sound into current or electromagnetic waves, and then transforms it into sound after long-distance transmission reaches the other end.It is just that the human voice audio rate 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 antenna required - if the voice signal is directly emitted, the antenna length will reach more than 100 kilometers, which is not possible in engineering.

Therefore, in order to transmit the voice out, you must ride on the higher frequency of the carrier.

This is what is called modulation.

After the new waveform mixed together between the two is accepted, the listener must also filter the high-frequency waves through a series of detoxification methods, leaving only meaningful low-frequency waves, in order to be converted into the final voice.

If the amplitude-modulation transmitter is successful, both the First Army and the intelligence agency will have the ability to communicate in real time in the true sense.

Its significance for war is self-evident.