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Main Text Chapter 2 Change to Xiao Zhu

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    Spectrum analyzers are no strangers. There are big ones and small ones. The big ones are as big and heavy as the old-fashioned oscilloscopes in university physics laboratories, and the small ones are as portable and light as Nintendo handhelds. The function of spectrum analyzers is to detect radio signals  , it can accurately capture the invisible electromagnetic waves in the air and display them with an oscilloscope.

    There is a wave at the frequency of 14mhz, so there is a peak on the horizontal axis of 14mhz.

    There is a wave at the frequency of 144mhz, so there is a peak on the horizontal axis of 144mhz.

    There are several peaks in several waves, double peaks in double waves, and peaks in large waves.

    Soon the uncommitted person brought the spectrum analyzer, and someone knocked on the door, Wang Ning hurried over to open the door, and standing outside was a young man with disheveled hair, sweating profusely, wearing blue short-sleeved  Shirt and black shorts, this is the unlucky guy who was called to help by an unscrupulous leader at night, holding a spectrum analyzer wrapped in wires in his hand.

    After all, he is a newcomer in the workplace who has just graduated and doesn't know how to refuse a job that doesn't belong to him.

    If he was as thick-skinned as Lao Bai, when he received the phone call, he would reply "Oh brother, I'm sorry, I'm busy ah ah".

    At the same time, accompanied by the sound of heavy breathing.

    No matter how unscrupulous the leader is, he retreats at this time.

    Pharaoh is not sure, but he also cares about young people, pay attention to their health, and don't get addicted to it.

    "Brother Wang, I brought you the spectrum analyzer." The young man was out of breath, and he was tired enough to climb the eight floors with such a big thing, "Is this it?"

    "Oh, thank you, thank you! That's right, that's it, Xiao Zhu, you can help a lot." Wang Ning quickly took over the spectrum analyzer, "Are you tired? Sit down and drink some water."

    "No, no, thank you, Brother Wang." Xiao Zhu waved his hand, "If there is nothing else, I will go back first, and see you, Brother Wang."

    "See you tomorrow!"

    The young man turned around and went downstairs in a hurry.

    Wang Ning put the white spectrum analyzer on the dining table in the living room. This thing is larger than the icom725 shortwave radio in the room. It has a white engineering plastic shell and a carrying handle. The left half of its operation panel is a liquid crystal display.  On the right half of the screen, there are neat English and number buttons.

    "What is this?" Mom came out of the kitchen, and took off her apron casually. "You got another radio?"

    "Spectrum analyzer." Wang Ning replied, "Agilent, one set costs tens of thousands of dollars."

    "I got it from Wuwei?" Mom asked, "You know how to use this thing?"

    "I'm an expert." Wang Ning patted his chest, "Do you know when I first used a spectrum analyzer? The first time I operated this thing was"

    "When?" Zhao Bowen asked.

    "Twenty years ago." Wang Ning said.

    "Then you have rich experience." Zhao Bowen said, "Director Wang."

    "Isn't it? At that time, I used an old HP spectrum analyzer to help China Unicom debug the paging station." Wang Ning said, "Test the phase difference between the two antennas of the paging station. Do you know that thing? Because there is a phase difference between the two antennas.  Poor, if you need to unify, you have to use this thing to test, and that is still the era of bp machines."

    "Then when was the last time you used a spectrum analyzer?" Dad asked.

    "The last time was the first time."

    "Are you really a non-committee? Haven't touched a spectrum analyzer for twenty years?" Dad asked, "Why does the non-committee have such a waste like you? Why does the country raise such a moth like you?"

    "Gun Gun, I just said that I didn't operate it myself, but it's okay for me to instruct others to operate it?" Wang Ning said, "The elderly are not allowed to touch fish?"

    He connected the power to the spectrum analyzer, turned on the switch, and the LCD screen lit up.

    The spectrum analyzer is more convenient to use than a radio station. The important point is that it does not need to pick a power source, and it can be used by plugging in a 220-volt household AC.

    Unlike radio stations that can only use direct current, those who play radio stations must always have car batteries at home.

    There is a grid coordinate system on the screen, the x-axis is the signal frequency, and the y-axis is the radiation intensity. A rough yellow jagged line is restless on the coordinate system. The restless line means background noise, and the background noise means that the radio cannot receive  The rustling sound when the signal is received, the snowflakes when the TV has no signal, it may come from humans, it may also come from nature, or even from the cosmic microwave background radiation. In addition to the jagged background noise, there are several obvious raised peaks.

    These peaks are the signals captured by the spectrum analyzer. They may be broadcasts, walkie-talkies, or other radio stations. Radio waves in modern society have no holes.Access is everywhere, and the frequency scanning capability of the spectrum analyzer can theoretically search for electromagnetic waves of all frequencies nearby.

    Wang Ning began to set the basic parameters of the spectrum analyzer.

    Press the "amplitude" button on the right side of the operation panel. The word means "amplitude", which is actually the signal and radiation intensity, and the y-axis parameter is set.

    Wang Ning set the y-axis unit to db¦Ìv.

    Next, set the x-axis parameters - the monitoring range of the spectrum analyzer is the whole frequency band, and it will search for a lot of messy and unnecessary signals, but what Wang Ning needs to monitor is Baiyang's icom725, and the frequency of Baiyang is 14 MHz  , so Wang Ning needs to narrow the scope of monitoring.

    Press the "frequency channel" key on the operation panel. In the upper left corner of the button area, this word means channel. Press it to set the x-axis parameters, which is the frequency monitoring range of the spectrum analyzer.

    "Xiao Yang¡ª!" Wang Ning asked, "It's 14 MHz, right?"

    "right!"

    Wang Ning narrowed the monitoring range of the spectrum analyzer to 5 MHz to 50 MHz.

    "Xiao Yang! Press ptt to try!"

    Bai Yang pressed his hands on the microphone when he heard the news.

    The icom725 transmitter on the table sends signals to the outside world.

    Bai Yang didn't speak, so what the radio station emitted was an unmodulated carrier wave, just a piece of meaningless electromagnetic radiation.

    Immediately, the waveform on the spectrum analyzer display in the living room climbed rapidly, forming a small crest at the position of 14 MHz, which was undoubtedly Bai Yang's radio signal.

    "Look, this is Xiao Yang's signal." Wang Ning pointed to the wave crest on the screen, "Although it is a little weak, it is obvious that it is on the frequency of about 14.255 MHz. Let's just wait for Xiao Yang and that signal.  Connect to bg4msr, let¡¯s try to see if we can catch the other party¡¯s signal, if we can catch it, it¡¯s easy, we have plenty of ways to find the source of the signal.¡±

    "What if you can't catch it?" Bai Zhen asked, "Didn't you hear the girl's voice when you were listening?"

    Wang Ning pondered for a while.

    "It's unlikely that we won't be able to catch it. It doesn't make sense that we can't receive the signal that can be received by abducting two or five. In case, I mean in case we can't receive it¡ª"

    "What does that mean?" Bai Zhen asked.

    "It means the spectrum analyzer is broken." Wang Ning said, "Let's ask Xiao Zhu to come over and change a spectrum analyzer."

    "If you change to another spectrum analyzer, you still can't receive it?"

    "Then let Xiao Zhu come over and change another one." Wang Ning said.

    "What if the spectrum analyzer can't receive it after changing it all over?"

    "Then change to Xiaozhu."
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