The room where Li Xinran lives is about ten meters underground, and there is a rudimentary elevator that has been broken for many years, and can only be entered and exited by walking from the steps of the entrance staircase.

About 300 meters away from the room, it is the spare warehouse of the early nuclear test base in the Aksai Chin area of the Chinese Academy of Sciences, and it is also what Li Xinran's father has guarded for half his life.

There are almost no above-ground structures in the entire base, except for two towers and a tall fence.

Li Xinran was very rare to stay at home in broad daylight, humming a song and smashing the husks laid on the concrete floor one by one with a hammer.

Lifus was repairing the water purifier, wrapped tightly and wearing thick leather gloves on his hands, which made his work very slow, and it took a lot of time to remove each screw with a screwdriver.

This water purifier is a special water purifier produced by Fermi to purify nuclear-contaminated water, which Li Xinran's father exchanged for a lot of food. It has three large chambers, the first is used for distillation, because the vast majority of nuclear radiation in the polluted water is radioactive dust, and most of the radioactive materials are not volatile, so simple distillation can separate most of the radiation in the water, the second chamber has some reverse osmosis membranes, a lot of radioactive dust is very small, can enter this chamber with water vapor, and then these water vapors are continued to be heated and pressurized, when they reach a supercritical state, they are compressed through the reverse osmosis membrane, and the radiation dust is isolated, The last chamber is filled with resin, and the residual radioactive dust in the water is adsorbed by the resin, so that the purified water is so pure that even bacteria and viruses are killed and filtered out.

After inspecting everything, Lifus determined that the fault occurred in the power supply module, where a patch resistor had burned out, and he took the discarded electric heater apart and cut a section of heating wire.

The photon scanner in his eye can instantly determine the material and cross-sectional area of the heating wire, and then use the particle processor in his head to calculate the length of the heating wire at the same resistance of the chip resistor. He then wrapped the heating wire around a small piece of mica, which was also removed from the heater, to make a simple resistor.

In the end, he used the laser of the monkey watch to weld the two stages of the self-made resistor to the tin point of the circuit board, and replaced it with a spare piece of resin, and the water purifier was repaired. The cleaned up radioactive residue and the replaced resin, along with gloves, had been thrown into a thick iron box, which Lifus was about to bury deep in the ground.

"By the way, last time I heard you say that the Doomsday Army organization over there in Immortal Bay has been broadcasting, what is their frequency?" After Li Fusi finished repairing the water purifier, he sat on the chair and asked Li Xinran, who was smashing the fruit core happily.

Li Xinran didn't raise her head, and replied while continuing her work: "About 1900 MHz, but are you sure you want to see it?" It's all lies and boring performances, but now it seems that their accusations against the League are correct. ”

The Monkey Watch can receive all the signals in the full band, of course, unlike the full-band nature of home radios, it can receive all the signals in the full band at the same time, and then selectively watch them or even record them all and then play them at the right time.

The monkey watch does not have a large screen to play the signal, but the 512-bit color 3D holographic projection is more realistic and shocking than the world's highest-resolution movie screen, but it is a pity that the broadcasts in the country of immortals are all two-dimensional images, which greatly reduces the viewing of the video.

Livers simply took off the monkey watch, put it on the table and played it automatically, then went to pour himself a glass of water, and sat down in a chair to watch with relish.

Li Xinran had never seen holographic projection technology, and she was also very curious, she put down her work and sat next to Li Fusi to watch it, although she had watched these broadcasts countless times.

"You're very advanced." Li Xinran said.

"Well, strictly speaking, it's the most advanced in the world right now...... Wristwatch...... One of them. Lifus wanted to say that it should be regarded as the most advanced equipment in the world, but when he thought that there might be something higher in the world than it, he felt that it was not rigorous enough, so he changed the equipment to a watch, but then he thought that the leaders of the other groups also owned a monkey watch, so he added a "one" at the end of the sentence.

"Cut, look at you like that, I don't care if you want it, are you going to do it?" The girl squinted at Livers with a look of disdain.

Lifus wanted to explain, but felt that it was not necessary, so he simply shut up and did not speak.

Then neither of them spoke, quietly watching the projection, which lasted for a long time, and the atmosphere became very strange again.

The picture is constantly changing, and most of the time it is stable, and occasionally it shudders, as if it has been disturbed by something, and in severe cases, the picture is distorted.

Lifus went over and picked up the monkey watch and examined it carefully.

"Yes, put it away quickly, don't let people steal such a precious thing." Li Xinran said with a sneer.

Lifus ignored her, intently checking the information on the monkey's surface. This made Li Xinran even more angry, she jumped off the chair angrily, and turned her head to do her unfinished business of smashing fruit shells.

After a while, Lifus handed her a monkey watch and said, "Look at it. ”

Li Xinran pursed her mouth: "Who is rare?" Don't rely on me anymore. ”

"There's a big secret here, and you'll regret it if you don't read it." Lifus smiled and said, this little girl really likes to lose her temper.

"Your tricks are too old-fashioned and LOW, what? Now that I remember that there is a big beautiful woman next to me? Tell you, it's late! This girl is also a rich and unadulterated master! Li Xinran felt that she was angry with herself, so she quickly rubbed her chest with her hand and told herself not to be angry.

"There is really a secret, I didn't lie to you, I don't believe you." Lifus diffracted the image on the narrow LCD screen of the monkey watch onto a holographic projection, which made it look more intuitive and easy to explain.

"You see, the broadcast of the country of immortals uses high-frequency signals, and the transmission point is near the astronomical point, that is to say, the astronomical point is one of their relay stations, but whether it is the astronomical point or the fairy bay, it is not far from us, and in the current world where wireless electronic products are about to become extinct, it is unlikely to be subject to too strong interference, so I checked the interference source."

Lifus switched the picture from a radio wave isofrequency line map to a radar scan image with a string of tabular data underneath the image.

"This is a map of all the data and geographical locations of radio waves of each frequency in all bands from the beginning of the radio wave receiver to the present." Lifus pointed to one of the table data on the holographic projection and said: "This radio wave is the broadcast signal of the country of immortals, 1985 MHz, it seems that it is intended to imitate the frequency of various mobile phones and communicators, the wireless receiving system of the monkey meter has a built-in iron-based superconducting filter, which can select the frequency with high precision, unless the frequency difference between the two signals is very small, and the signal source must be particularly close to cause interference." Then, obviously, this is the one that can interfere with the broadcast signal of the fairy country. ”

Livers' finger pointed to a table of data that was lower and stopped there.

Li Xinran's curiosity was completely aroused, and she had forgotten why she was angry just now.

"This signal source is from Hideaway Bay, it's strange, why would they interfere with their own signal? It has a very low transmit power, but the transmission distance is very long, and the frequency is super stable, fixed at 1999 MHz, which is obviously a very high-quality transmitter. ”

"So, is it because its transmit power is too low, so it can't really interfere with or cover the broadcast signal of the Immortal Country, and we can't intercept all of its information?" Li Xinran finally couldn't hold back and began to ask questions.

"Yes and no." Li Fusi sold a pass, and he was able to make Li Xinran forget to be angry, and his goal was actually achieved.

"The low transmission power is indeed one of the reasons, maybe to make the emission more hidden, but the main thing is that this radio wave does not carry any information at all, yes, it is just a pure electromagnetic wave."

"It's very weird, so I'm going to focus on it." Lifus clicked with his finger on the column corresponding to the signal on the Monkey Table screen, and then a larger and more comprehensive table appeared, about the power, frequency, transmission location, transmission time and duration of the signal, etc., all at a glance.

"The most interesting thing is that this ultra-short wave is not continuous, it is emitted every five seconds, for one second, after three launches, with an interval of twenty-three seconds, and then three more times at the same frequency, then with an interval of one minute, after one minute, and the above process is repeated, very regularly."

"I thought it was probably trying to get something out of our way, and I found this again." Lifus returned to the page he had just seen, found a table box at the bottom, and clicked on it.

"This is an ultra-low frequency long-wave signal, also from Sanctuary Bay, the frequency is only 58 Hz, but it is also extremely stable, its power is the same as the previous one, and the transmission law is the same as that, it is transmitted once every five seconds, and the duration is one second, the difference is that its interval time is one minute and eighteen seconds."

Lifus paused, took a sip of water, and then continued: "According to the analysis of their emission times, the timelines of the two radio waves separated from each other are perfectly compatible, so it is certain that the two radio waves with very different frequencies are emitted by a single transmitter, first emitting three ultra-high frequency radio waves, then three ultra-low frequency radio waves, and then three ultra-high frequency radio waves, and so on in a cycle, with an interval of one minute. ”

"So, the two different frequencies of the radio waves emitted by this transmitter don't have any meaning, the significance lies in the order in which they are arranged." Lifs set the screen of the monkey watch to graffiti mode, and then wrote on it: shortwave, shortwave, shortwave, longwave, longwave, longwave, shortwave, equal: SOS.