Chapter 42: Change Xiao Zhu

We are all familiar with spectrum analyzers. There are big ones and small ones. The big ones are as big and heavy as the old oscilloscopes in university physics laboratories, while the small ones are as portable and light as Nintendo handheld game consoles. The function of a spectrum analyzer is to detect radio wave signals. It can accurately capture the invisible and shapeless electromagnetic waves in the air and display them with an oscilloscope.

If there is a wave on the frequency of 14MHZ, then there will be a peak on the horizontal axis position of 14MHZ.

If there is a wave on the frequency of 144MHZ, then there is a peak on the horizontal axis position of 144MHZ.

There are as many peaks as there are waves. If there are double waves, there will be double peaks. If the waves are large, there will be high peaks.

Soon the people from the Wuwei Committee brought the spectrum analyzer. Someone knocked on the door and Wang Ning hurried over to open it. Standing outside the door was a young man with disheveled hair, sweating profusely, wearing a blue short-sleeved shirt and black shorts. This was the unlucky guy who was called by the unscrupulous leader to help in the middle of the night, holding a spectrum analyzer tangled with wires in his hand.

After all, he is a new employee who just graduated and does not know how to refuse a job that does not belong to him.

If he had as thick-skinned as Lao Bai, he should have replied “Oh, Brother Wang, I’m sorry, I’m busy…ah…ah…” when he answered the phone.

Accompanied by heavy breathing.

Even the most unscrupulous leader would retreat at this time.

Lao Wang might also like to remind young people to take care of their health and not to become addicted to it.

"Brother Wang, I brought you the spectrum analyzer." The young man panted. He was exhausted from carrying such a big thing up eight floors. "Is this it?"

"Oh, thank you! Yes, yes, that's it. Xiao Zhu, you've been a great help." Wang Ning quickly took the spectrum analyzer. "Are you tired? Sit down and have a drink of water."

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

"See you tomorrow!"

The young man turned around and ran downstairs.

Wang Ning placed a white spectrum analyzer on the dining table in the living room. This thing is a little bigger than the Icom725 shortwave radio in the room. It has a white engineering plastic shell and a built-in handle. The left half of its operating panel is an LCD screen, and the right half is neatly arranged with English and number buttons.

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

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

"Wu Wei got it?" Mom asked, "Can you 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 in..."

"When?" Zhao Bowen asked.

"Twenty years ago." said Wang Ning.

"You have a lot of experience then." Zhao Bowen said, "Director Wang."

"Isn't it? At that time, we used the old HP spectrum analyzer to help China Unicom debug the paging station." Wang Ning said, "To test the phase difference between the two antennas of the paging station, you know that thing? Because there is a phase difference between the two antennas, we need to unify them, so we have to use this thing to measure it. That was still the era of pagers."

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

"Last time was the first time."

"Are you really from the Wuwei? You haven't touched a spectrum analyzer in 20 years?" Dad asked, "Why would the Wuwei have a waste like you? Why would the country support a parasite like you?"

"GongGong, I just said that I didn't operate it myself, but I can't direct others to operate it?" Wang Ning said, "Are elderly people not allowed to touch the fish?"

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

The spectrum analyzer is easier to use than a radio station. An important point is that it is not picky about power supply and can be used by plugging in 220-volt household AC power.

Unlike radio stations which can only use direct current, those who operate wireless radio stations must always have a car battery at home.

On the screen is a grid coordinate system, with the X-axis representing signal frequency and the Y-axis representing radiation intensity. An uneven yellow jagged line is moving on the coordinate system. The moving line means background noise. Background noise is the rustling sound when the radio cannot receive a signal, and the snowflakes when the TV has no signal. It may come from humans, nature, or even the cosmic microwave background radiation. In addition to the jagged background noise, there are also several obvious protruding peaks.

These wave peaks are the signals captured by the spectrum analyzer. They may be broadcasts, walkie-talkies, or other radio stations. In modern society, radio waves are pervasive and ubiquitous. The frequency scanning capability of the spectrum analyzer can theoretically search for electromagnetic waves of all nearby frequencies.

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

Press the "AMPLITUDE" button on the right side of the operation panel. This word means "amplitude", which actually refers to the signal and radiation intensity. It sets the Y-axis parameters.

Wang Ning set the Y-axis unit to dBμV.

Next, set the X-axis parameters - the spectrum analyzer's monitoring range is full-band, and it will search for a lot of messy and unnecessary signals. What Wang Ning needs to monitor is Bai Yang's Icom725, and Bai Yang's frequency is 14 MHz, so Wang Ning needs to narrow the monitoring range.

Press the "FREQUENCY CHANNEL" button on the operation panel. It is located in the upper left corner of the button area. This word means channel. By pressing it, you can set the parameters of the X-axis, which is the frequency monitoring range of the spectrum analyzer.

"Xiao Yang——!" 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 and try it!"

Bai Yang pressed the microphone upon hearing the news.

The Icom725 transmitter on the table sends signals to the outside.

Bai Yang didn't say anything, so the radio station transmitted an unmodulated carrier wave, which was just a meaningless electromagnetic radiation.

The effect was immediate. The waveform on the spectrum analyzer display in the living room rose rapidly, forming a small peak at the 14 MHz position, which was undoubtedly Bai Yang's radio signal.

"Look, this is Xiao Yang's signal." Wang Ning pointed at the peak on the screen. "Although it's a little weak, it's very obvious. It's at a frequency of about 14.255 MHz. Let's do this later. When Xiao Yang and that BG4MSR are connected, we'll try to see if we can catch their signal. If we can, it will be easy. We have plenty of ways to find the source of the signal."

"What if we can't catch her?" Bai Zhen asked, "You didn't hear the girl's voice when you were monitoring her earlier, right?"

Wang Ning pondered for a while.

"It's unlikely that we won't be able to catch him. There's no reason why we can't receive the signal that Jia Erwu can receive. What if, I mean what if we can't receive it——"

"What does that mean?" Bai Zhen asked.

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

"What if I change the spectrum analyzer and still can't receive it?"

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

"What if I can't receive it even after changing all the spectrum analyzers?"

"Then change to Xiao Zhu."

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(A word from the author: This book is a work for the theater essay collection, so the length will not exceed 500,000 words.

But I estimate that the number of words in this book is only about 400,000, and old readers should be accustomed to this length.)

(End of this chapter)