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Free Web Novel,Novel online - All in hlnovel.com -> Sci-fi -> We live in Nanjing Text Chapter Ten The First Evidence
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- "Thank youthank you."
The three of Bai Yang stammered their thanks, they were all stunned, and before they had time to say anything, the waitress had already set the tableware, smiled slightly, and quickly retreated and disappeared.
Bai Yang ate the dinner without any risk, and went straight home after the evening self-study to ask the teacher. He wanted to know what these people said to the school, which caused the teachers to look at him so that he felt that he was old. Not much, but as soon as he got home, he found a group of people crowded in his bedroom and chatting happily. Bai Yang was surprised——
"That's right, that's right, it's Zifeng Building, and it only takes five minutes to walk there."
"Wait a minute, we are looking at the map."
"Look for it! Pharaoh, can you find any shortcuts nearby?"
"How fast can that big eyeball move? Let's see if we can estimate a safe range"
Bai Yang pushed open the door: "What are you doing?"
The three old men turned their heads together like thieves, looking at their expressions, they thought they were the scene of a conspiracy.
"I'm chatting with a little girl."
The old man was holding the microphone, while Wang Ning and Zhao Bowen stood on both sides of the chair, one holding a large map in one hand, and the other holding a tablet computer.
"You have already connected with her?" Bai Yang was a little surprised, he glanced at the time, it was only eleven o'clock, "So early?"
"Earlier than you think." Zhao Bowen said, "We connected three hours ago."
"Bg4msr, my son is back from school, let's chat next, over." Lao Bai happily gave up his seat and put his microphone on the table.
"Thisisn't it only after eleven o'clock? Why is it so early today? Three hours ago?" Bai Yang dropped his schoolbag and squeezed over, a girl's crisp voice came from the speaker of icom725: "bg4mxh? You're back ?"
"It's me, I just came back, over." Bai Yang pressed his hand and replied, then turned to ask his father, "What's going on? It's not time yet?"
The experience of the past few months told them that this radio station can only be connected to bg4msr after eleven o'clock in the evening, and not at other times. , 6pm, and 8pm have all been tried without success.
Only calls after eleven o'clock in the evening can ensure success.
"This is because our understanding of it has gone one step further." Zhao Bowen pointed to the radio station, "We have found indirect evidence that the black moon is an important factor affecting the communication through time and space."
"What kind of evidence?"
"The evidence is the frequency." Zhao Bowen replied, "This is just a speculation. During the period when we took this crutch out for inspection, there were several conjectures within the team about the cause of the hyperspace communication. We successfully verified one of them today—”
"I just can't understand your virtue of twisting your tongue." The old man complained, "Can you tell me the key points?"
"I have to explain the ins and outs clearly, right?" Zhao Bowen rolled his eyes, "If you have the ability, tell me."
"I'll tell you what I say!" Dad snorted, "Actually, the reason is very simple. The reason why we were able to contact bg4msr in advance is because it was already there."
Bai Yang didn't understand what this meant.
"That's right, in fact, you can connect to bg4msr at seven o'clock in the evening, all the time." Zhao Bowen interjected, "You don't have to wait until after eleven o'clock in the evening."
"But I tried it." Bai Yang was surprised, "It doesn't work at all!"
"Because your frequency is wrong." Dad said.
"14.255mhz." Bai Yang said.
"She wasn't on 14.255mhz at seven or eight o'clock at night," said Dad. "That's the point."
Bai Yang was dumbfounded.
"Then where is she?"
"About 14.305mhz." Dad replied, "This is what we tested."
Bai Yang didn't believe it, so he decided to hold the microphone in his hand and ask directly: "bg4msr, bg4msr, let me ask you a question, do you adjust your radio frequency at night? over."
"FM?" the girl said, "No, I have always been 14.255mhz."
"Listen, she said she hasn't adjusted the frequency." Bai Yang leaned back in the chair loudly.
"Of course she hasn't adjusted the frequency, but the frequency change is not necessarily artificial." Zhao Bowen explained, "You know about Doppler radar, right? The principle of measuring the target's flight speed based on the frequency change of radar waves is used by amateurs. In radio activities alsoCommonly used. "
"Satellite shooting," Bai Zhen said.
The so-called satellite shooting is a very common amateur radio activity. In addition to direct frequency communication, relay stations and ionospheric reflection, hams can also rely on artificial satellites in orbit for amateur radio activities. Satellites with radio signals are called amateur satellites—for example, the Lilac series satellites developed by Harbin Institute of Technology. Of course, the International Space Station is also a super-sized amateur satellite (the International Space Station plays a very important role in the world amateur radio movement). Long-distance calls can be made through amateur satellites, but it should be noted that amateur satellites are low-orbit satellites. Unlike geosynchronous orbit satellites, low-orbit satellites will not remain relatively stationary with the ground, and they will pass at a fast speed—once There is a relative velocity, so the Doppler effect of electromagnetic waves is an influencing factor that cannot be ignored.
When the satellite enters the country, the frequency of the electromagnetic wave will increase due to the rapid shortening of the distance. When the satellite leaves the country, the distance will increase, and the frequency of the electromagnetic wave will decrease. This principle is the same as standing in a train station and listening to the train The whistle of the station changes exactly the same.
Therefore, when ham is playing a satellite, it must adjust its own transceiver frequency according to the position of the satellite, which is called Doppler frequency shift.
"I know this."
Of course Bai Yang knew what the Doppler effect was, but he and bg4msr did not communicate via satellite, so why would he be affected by the Doppler effect?
"Don't worry, listen to us." Zhao Bowen said, "According to the current experiment, we can draw a preliminary conclusion. After about half past six, we can vaguely catch a little bit of signal, and after seven o'clock , the signal was clear enough to make a normal call, and the frequency at that time was 14.305mhz, which was much higher than 14.255mhz, why is that?"
Bai Yang thought for a while.
"Because something came in?"
"In the middle of the night, after two o'clock in the morning, the best communication frequency will drop to 14.235mhz, why?"
Bai Yang thought for a while.
"Because something is leaving the country?"
"What exactly is entering and leaving the country?" Zhao Bowen asked, "If you think about this time point, what will appear at 6:30 in the afternoon? It will stabilize at 12:00 midnight? It will start again after 12:00. Extend the distance?"
Bai Yang slapped his head.
"Black Moon."
"That's right, this is the indirect evidence we found. The change in the frequency of the radio station coincides with the change in the position of the black moon. The black moon must be an important factor affecting the communication through time and space. This is the first strong evidence we found." Zhao Bowen said, "The speed of frequency change is about 10khz per hour. This frequency change is not small, so you can't contact bg4msr before eleven o'clock, and she is not within your reception range at that time."
Bai Yang understood.
He couldn't contact bg4msr during the day because the black moon was not in the sky.
He couldn't contact bg4msr before eleven o'clock because the frequency was not matched.
The bandwidth occupied by sending letters in ssb mode is very narrow (note that sending any information will occupy bandwidth, if a station sends a letter on a frequency of 15.000mhz, it actually occupies a frequency with 15.000mhz as the midpoint, not 15.000mhz One point), generally speaking, among all kinds of radio modulation methods, frequency modulation occupies the most bandwidth, frequency modulation is greater than amplitude modulation, ssb is greater than cw, cw is telegraphing, it occupies the smallest bandwidth, but cw can only tick, the advantage of ssb is you You can use it to talk directly and the frequency band it occupies is very narrow. The bandwidth occupied by Bai Yang's ssb mode is only about 20khz. His sending and receiving are mainly concentrated in the narrow range from 14.255mhz to 14.275mhz. Once the other party's signal leaves this interval, he will not be able to receive it.
Based on 14.255mhz at twelve o'clock in the middle of the night, calculated according to the speed of frequency shift of 10khz per hour, the frequency in the first half of the night will be higher than this figure, the frequency of bg4msr at seven o'clock in the evening is 14.305mhz, the frequency of bg4msr at eight o'clock in the evening It was 14.295mhz, and the frequency of bg4msr was 14.285mhz at nine o'clock in the evening, and it didn't enter Baiyang's acceptable range until ten o'clock in the evening.
This is the first time that Zhao Bowen and others have confirmed that the black moon has an important influence on the communication through time and space.
"Why does it have such an effect?" Bai Yang didn't understand, "The black moon is not a relay, the signal is not sent to the black moon, why does it cause the Doppler effect?"
"Yes, none of you are using directional antennas, and you have to use Yagi to launch satellites. The black moon is not a relay, and this Doppler effect is not caused by the moving speed of the black moon." Zhao Bowen nodded, "So We speculate that its influence is at a deeper level. This conjecture is very bold I did not propose it. I am not so wild. It is a comrade from the Institute of Physics who said that time and space are inseparable. Since the black moon has affected time, then we cannot expect space to be unaffected, the Doppler effect of the radio signal is only an external manifestation of the influence of the black moon on space"
"It's not the frequency of the radio wave that changes, but the space in which the radio wave is located." Zhao Bowen paused, "The black moon may be pulling and compressing the space on a large scale."
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(The author's gossip: I'm one year older today.) I can only remember the address of this site in a second:?, since the black moon affects time, we cannot expect space to be unaffected. The Doppler effect of the radio signal is only an external manifestation of the black moon’s influence on space"
"It's not the frequency of the radio wave that changes, but the space in which the radio wave is located." Zhao Bowen paused, "The black moon may be pulling and compressing the space on a large scale."
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(The author’s gossip: I’m one year older today.) I can only remember the address of this site in a second. - Didn't finish reading? Add this book to your favoritesI'm a member and bookmarked this chapterCopy the address of this book and recommend it to your friends for pointsChapter error? Click here to report
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