Graycastle, City of Neverwinter.
Two days later, Roland received a report on the battle on Archduke Island and the situation in the Kingdom of Wolfheart.
Compared to the previous time when it took a week to send a letter from Evernight City in the Northern Region to Neverwinter, this speed was a huge improvement. Regardless of whether it was the short-distance express delivery of air messengers or the long-distance travel of steam ships day and night, they were now all part of the information transmission system. Every important message would be sent by a special person, a special ship, or even a plane — and this time, the report was sent by Tilly.
"Thank you for your hard work." Roland handed her a Chaos Drink. "How's the situation over there?"
"Won't you know after reading the report?" Tilly took the cup and glanced at him. "You're so attentive. Why are you feeling guilty? Is it because you still don't have a clue about my dedicated computer? "
"Pfft …" Nightingale's stifled laughter came from behind him.
"How could that be? I've already chosen the most suitable one from several plans. As soon as Anna has time, we can start the trial production immediately." Roland hurriedly said, "You know, several projects have reached the most critical stage recently. She's really too busy."
"For Anna's sake, I won't argue with you this time, brother." Tilly drank the drink in one gulp, wiped her mouth, and walked out of the office. "The 'Seagull' will be returning soon. I'll return to the Air Knight Academy first."
"Not even for a day?" Roland was slightly surprised.
"I have no choice. Right now, the only things that can threaten the Sky Lord are the 'Seagull' and Andrea. Also … I don't want to miss any opportunity for revenge." Tilly waved her hand with her back facing him. "Then I'll be going, brother."
Looking at the closed door, Nightingale sighed softly. "Everyone … is working hard."
If possible, I would rather they work hard in other areas than war. This thought emerged in Roland's mind, but he did not say it out loud. Before the end of the Battle of Divine Will, before the fate of mankind was decided, no one could rest from this heavy burden. There was no point in saying this now, other than avoiding responsibility.
After a moment of silence, he broke the seal on the report.
After reading all the reports, Roland finally understood what Tilly meant. Edith Kant and Andrea were undoubtedly the greatest heroes of this battle, being able to issue the order to retreat in time and successfully ambush a Grand Lord that came and went without a trace on the vast sea. But at the same time, the sender of that crucial intelligence couldn't be ignored. Without this person's desperate move, they wouldn't have been able to win.
"What do you plan to do?" This matter had obviously attracted Nightingale's attention.
"Regardless of the original intention of sending this secret letter, this person's name and achievements shouldn't be forgotten," Roland said in a deep voice. If it was in his previous life, it would have been almost impossible to find an unknown spy after the long war. The only thing that could be left on the tombstone was an inscription that read, "No one knows your name, but your achievements will last forever." However, witches could change this unavoidable situation and let every soldier who contributed to the fate of mankind leave their name in the long river of history. "When the Kingdom of Everwinter is under the control of the First Army again, let Black Money cooperate with Summer to confirm his identity and origin."
If the murderer who killed him was still alive at that time, he would definitely not be able to escape the severe punishment of the law.
Nightingale nodded. "It would be great if the equipment that you mentioned could be manufactured earlier to allow communication across thousands of miles."
"Unfortunately, that's not my forte." Roland could not help but rub his forehead. Whenever he thought of the circuit diagram that he had forcibly memorized, he felt an incomparable headache.
"Now you can finally understand how I felt during the exam," Nightingale said while covering her mouth.
"But no matter how difficult it is, I won't fall asleep on the table like someone and hand in a blank paper in the end." Roland glared at her. "In fact, I've almost completed the manufacturing of the prototype."
That's right. Although the progress was extremely slow, the radio project had never stopped.
Like the piston engine, after considering many plans from the Design Bureau of Graycastle, he decided to choose two of them to work on at the same time.
These two were the spark transmitter and the amplitude modulation transmitter.
The former was the ancestor of radio communication. Its structure was extremely simple and did not have any electronic components. It only used the voltage transformer coil to increase the voltage to charge the capacitor until the voltage between the spark gap of the capacitor was high enough to break through the air and release electric sparks. This part was quite similar to a lighter, except that the electric current transmitted by the spark was not wasted. Instead, it repeatedly oscillated between the capacitor and the inductor, producing electromagnetic waves that were finally transmitted through the antenna.
In other words, as long as the power was switched on and off, it could emit intermittent electromagnetic waves. The listener could translate it into the corresponding signal based on the length of the sound. This was the origin of the long and short telegraph codes.
Although it still sounded a bit confusing, Roland used the most ingenious method, which was to first let the Design Bureau of Graycastle's wireless project team use readily available materials to build a usable real thing, and then copy the real thing.
For example, two pieces of tin foil were clamped on a stack of oiled paper, and then sealed with wax, which was a simple high-voltage capacitor.
The inductor was even simpler. It was nothing more than wrapping a coil of wire around an insulating tube.
Without considering mass production or specifications, Roland could complete the equipment by himself. Although compared to the sealed industrial products that were only the size of a fingernail, they looked thick and crude, the effect was basically the same. When the transmission tower was built, he could attempt the first wireless transmission experiment of this era.
However, the shortcomings of the spark transmitter were also very obvious.
Even if it passed the test, to be put into official use, he still had to design a set of code that matched the kingdom's language. The training of the transmitter and receiver would also take a lot of time. In addition, the spectrum of the spark transmitter was extremely wide, and only one transmitter could work in the same range. It was not suitable for frontline intelligence personnel to use.
Therefore, his ultimate goal was still the amplitude modulation transmitter that used electron tubes to amplify the signal.
And the biggest advantage of the latter was that it could directly transmit voice signals.
In principle, radio communication and telephone were essentially very similar. They both converted the vibration of sound into electric current or electromagnetic wave changes, and after long-distance transmission to the other end, it was converted back into sound. However, the frequency of the human voice was too low, causing the wavelength of the signal to be too long. The longer the wavelength, the larger the size of the antenna needed. If the voice signal was directly transmitted, the antenna length would probably be more than 100 kilometers, which was impossible in engineering.
Therefore, if he wanted to transmit the voice, he had to ride on a carrier with a higher frequency.
This was the so-called modulation.
After the new waveform of the two was accepted, the receiver also had to use a series of demodulation methods to filter out the high-frequency waves, leaving only the meaningful low-frequency waves, which could be converted into the final voice.
Once the amplitude modulation transmitter was successful, both the First Army and the intelligence agency would truly have the ability to communicate in real time.
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