The Grey Keep, Winterless.

A report on the battle on Grand Ducal Island and the situation in the heart of the wolf was sent to Roland two days later.

Compared to the previous time it took to send a letter from Eternal Night City in the north to Neverwinter, this speed of communication cannot but be said to be a huge improvement. Whether it's a short courier from a flying courier or a long day and night steam ship, it's now integrated into a messaging system, and every important message is sent on a special ship or even a plane—and this time it's Tilly who sent the report.

"Thank you. Roland asked warmly and handed over the Chaos Drink, "Is the situation okay over there?"

"Don't you know if you read the report?" Tilly took the cup and glanced at him, "What are you doing with such diligence?

Behind the "poof...... came the sound of a nightingale's suffocated laughter.

"Anyway, I've already chosen the most suitable one from several options, and as soon as Anna has time to spare, I can start trial production immediately. Roland hurriedly said, "You also know that several projects have reached the most critical step recently, and she is really a little busy." ”

"For Anna's sake, I won't bother with you this time, brother. Tilly took a sip of her drink, wiped her mouth and walked out of the office, "The Seagull is about to return, I'll go back to the Sky Knight Academy first." ”

"Don't you stay a day?" he said, slightly surprised.

"There's no way, the only ones on the front line who can threaten the Lord of the Sky Dome are the Seagull and Andrea, and ...... I don't want to miss a chance for revenge. Tilly turned her back to him and waved, "Then I'll go, brother." ”

Looking at the re-closed door, the nightingale sighed softly, "Everyone...... We're all working on it. ”

If I could, I would have preferred them to work on other fronts than war. Roland had such a thought in his heart, but he didn't say it—because no one could rest on this burden until the battle of divine will was over, until the fate of humanity was decided. There is no point in saying this now other than to evade responsibility.

After a moment of silence, he unsealed the report.

After reading all the reports, Roland finally understood the meaning of Tilly's words. Able to give the order to retreat in time and successfully ambush a devilish lord who came and went without a trace on the vast sea, Edith Kant and Andrea were undoubtedly the greatest contributors to this battle. But equally, the sender of that crucial piece of information cannot be ignored - without this person's desperate move, there would be no subsequent victory.

"What are you going to do?" the incident apparently caught the nightingale's attention as well.

"Whatever his original intention in sending this secret letter, this person's name and deeds should not be forgotten. Roland said in a deep voice. In a past life, it would have been almost impossible to recover an unidentified eyeliner after the long war had ended, and the tombstone would have left an inscription like "Your name is unknown, and your merits will live on forever". However, witches can change this unavoidable situation, so that every warrior who has contributed to the fate of mankind can leave a name in history. "Wait until the Kingdom of Eternal Winter returns to the control of the First Army, and let Black Money cooperate with Ah Xia to confirm his identity and origin. ”

If his murderer had been alive at that time, he would not have escaped the severity of the law.

Nightingale nodded, "If only the kind of device you said that could communicate across thousands of miles had been made earlier." ”

"Unfortunately, that's not what I'm good at. Roland couldn't help but rub his forehead, and the thought of the circuit diagram he had forcibly memorized made him feel a terrible headache.

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

"But no matter how hard it is, I'm not going to fall asleep on my desk like someone else and end up handing in a blank scroll," Roland glared at her, "I'm actually almost done with the prototype." ”

True, despite the extremely slow progress, the radio project never stopped.

As with the piston machine, after considering the numerous options of the Gray Fort Design Bureau, he decided to choose two of them at the same time.

These two are the spark transmitter and the AM transmitter.

The former is the originator of radio waves, the structure is extremely simple, there is no electronic components, just use the transformer coil to increase the voltage to charge the capacitor, until the voltage of the capacitor loaded in the spark gap is high enough to penetrate the air, and then release electric sparks. This part is a bit like a lighter, except that the current transmitted by the spark is not wasted, but oscillates repeatedly between the capacitance and the inductor to produce electromagnetic waves, and finally through the antenna, these electromagnetic bursts are emitted.

In other words, as long as the power supply is switched on and off, an intermittent electromagnetic break can be emitted – the receiver can translate it into a corresponding signal based on the length of the sound. The so-called long and short telegraph code comes from this.

Although it still sounds a little confusing, Roland adopted the most clever method, which is to first ask the radio project team of the Gray Castle Design Bureau to build a working physical object from the materials at hand, and then copy the real thing.

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

Inductors, on the other hand, are simpler than wrapping around wires around insulating pipes.

These devices can be completed by Roland on its own, without regard to mass production or specifications. Although they are coarse and rudimentary compared to those industrial products that are only the size of a fingernail when encapsulated, the effect is basically the same. When the tower was built, he would be able to try to conduct the first wireless transmission test of this era.

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

Even if it passes the test, it will take time to design a code that matches the Kingdom script, and it will take a lot of time for the sender and receiver to be trained. In addition, the frequency spectrum of the spark transmitter is extremely wide, and only one transmitter can work in the same range, which is not suitable for use by front-line intelligence officers.

Therefore, his ultimate goal was again an amplitude modulation transmitter that used tubes to amplify signals.

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

In principle, radio communication and telephone are very similar in nature, both of which convert the oscillation of sound into changes in electrical current or electromagnetic waves, which are transmitted over long distances to the other end and then converted back into sound. It's just that the human voice 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 have to reach more than 100 kilometers, which is an unachievable thing in engineering.

Therefore, if you want to transmit the voice, you must take a carrier with a higher frequency.

This is exactly what is called modulation.

After the new waveform is accepted, the listener must also filter out the high-frequency waves through a series of demodulation methods, leaving only the meaningful low-frequency waves before they can be converted into the final speech.

Once the AM transmitter is successful, both the First Army and the intelligence agencies will have the ability to communicate in real time in a real sense.

For war, its significance is self-evident.

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