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. The small ones are as portable and light as Nintendo handheld consoles. The function of a spectrum analyzer is to detect radio wave signals.

, it can accurately capture the invisible electromagnetic waves in the air and display them with an oscilloscope.

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

If there is a wave at the frequency of 144MHZ, there will be a peak on the horizontal axis of 144MHZ.

If there are several waves, there will be several peaks. If there are two waves, there will be two peaks. If there are big waves, there will be a peak.

Soon the unreasonable people brought the spectrum analyzer. Someone knocked on the door. Wang Ning hurriedly ran over and opened the door. Standing outside the door was a young man with disheveled hair, dripping with sweat and wearing blue short-sleeved shirts.

Wearing a shirt and big black shorts, this is the unlucky guy who was called to help by the unscrupulous leader late at night, holding a spectrum analyzer wrapped with wires in his hand.

After all, he is a newcomer to the workplace who has just graduated and does not know how to refuse a job that does not belong to him.

If he was as thick-skinned as Lao Bai, he should have replied "Oh, Brother Wang, I'm sorry, I'm busy...ah...ah..." when he received the call.

At the same time, there is the sound of heavy breathing.

No matter how unscrupulous a leader is, he will quit at this time.

Lao Wang is not sure and would like to remind young people to pay attention to their health and not to indulge in it and be unable to extricate themselves.

"Brother Wang, I brought you the spectrum analyzer." The young man was panting. He was exhausted from climbing eight floors with such a big thing in his arms. "Is this it?"

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

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

"See you tomorrow!"

The young man turned around and went downstairs.

Wang Ning placed 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 comes with a carrying handle. The left half of its operation panel is an LCD.

On the right half of the screen are neat English and numerical buttons.

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

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

"You got it for no reason?" 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..."

"When?" Zhao Bowen asked.

"Twenty years ago." Wang Ning said.

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

"Isn't that right? The old HP spectrum analyzer was used at that time 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? Because there is a phase between the two antennas.

It’s bad. If we need to unify it, we have to use this thing to measure it. This 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 unreasonable? You haven't touched a spectrum analyzer in twenty years?" Dad asked, "Why do you think there is a waste like you in the unreasonable person? Why does the country want to support a moth like you?"

"Gungun, I just said that I didn't operate it myself, but can't I instruct others to operate it?" Wang Ning said, "The elderly are not allowed to fish?"

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

The spectrum analyzer is more convenient to use than the radio station. The most important thing is that it does not require a power supply. It can be used by plugging in a 220-volt household AC power.

Unlike radio stations, which can only use DC power, those who play radio stations must always have a car battery at home.

On the screen is a grid coordinate system, the X-axis is the signal frequency, the Y-axis is the radiation intensity, and an uneven yellow jagged line is restless on the coordinate system. The restless line means back noise, and back noise means that the radio cannot receive it.

The rustling sound when receiving a signal, and the snowflake spots when the TV has no signal, may come from humans, nature, or even the cosmic microwave background radiation. In addition to the jagged noise floor, there are also several obvious raised wave peaks.

These wave peaks are the signals captured by the spectrum analyzer. They may be broadcasts, walkie-talkies, or other radio stations. Radio waves are pervasive and ubiquitous in modern society. 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" key on the right side of the operation panel. This word means "amplitude", which is actually the signal and radiation intensity. The Y-axis parameters are set.

Wang Ning sets the Y-axis unit to dBμV.

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. What Wang Ning needs to monitor is Baiyang's Icom725, and Baiyang's frequency 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——!" Wang Ning asked, "It's 14 MHz, right?"

"right!"

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

"Xiao Yang! Press PTT and try!"

Bai Yang pressed his microphone after hearing the news.

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

Bai Yang didn't speak, so the radio station emitted 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 climbed rapidly, forming a small peak at 14 MHz, which was undoubtedly Baiyang's radio signal.

"Look, this is Xiao Yang's signal." Wang Ning pointed to the wave crest on the screen, "Although it is a bit weak, it is obvious that it is at a frequency of about 14.255 MHz. We will leave it like this for a while, waiting for Xiao Yang and that

Connect to BG4MSR and let's try to see if we can catch the other party's signal. If we can, it will be easier. We have many ways to find the source of the signal."

"What if we can't catch it?" Bai Zhen asked, "Did you not hear the girl's voice when you monitored her before?"

Wang Ning pondered for a long time.

"It's unlikely that we won't be able to catch it. There's no reason why we can't receive the signal that Guailiangwu 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 over and replace the spectrum analyzer."

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

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

"What if I try to change the spectrum analyzer but still can't get it?"
Chapter completed!