My girlfriend is from 1949

Chen Huai'an opened the cardboard box and took out the police radio frequency jammer.

They placed it on the table and began to introduce it.

"This is police equipment; you can't buy it anywhere else."

They are typically used for special security missions, such as preventing remote-controlled bombs from detonating.

In addition, to handle on-site police situations and prevent signals from being transmitted and exposing the operation, surrounding signals are blocked.

Of course, it can also prevent riots orchestrated by malicious individuals from triggering mass incidents.

Chen Huai'an explained the functions of the jammer to them, giving them a general understanding.

First, you need to know the function before you can perform the corresponding operation, right?

Whether it was Lin Wan, Zheng Changlin, Wang Hai, or Ding Yonghua, they all worked in intelligence.

They also have a fairly comprehensive grasp of information from the outside world.

In addition to gathering intelligence, it is also necessary to gather information about foreign countries.

So even if I haven't actually seen a wireless remote control, I've heard about it.

For example, during the sinking of the Italian battleship "Roma", the German Air Force dropped F-1400 radio-controlled glide armor-piercing bombs for the first time in actual combat, successfully sinking the Italian battleship.

Around the same time, the German army also used the H 293 radio-controlled explosive glide bomb, both of which marked the beginning of radio signal controlled bomb warfare.

This radio frequency jammer is used to block these signals.

If you can't receive or send signals, you naturally can't control it.

Seeing that everyone understood the principle, Chen Huai'an placed his hand on the jammer.

He laughed and said, "The typical range of portable shielding is between 15 meters and 500 meters."

Under ideal conditions, a professional-grade backpack has an effective range of about 1-3 kilometers, which is usually reduced to 300-800 meters under the obstruction of urban buildings.

However, given the pristine skies of the Republic of China era, there weren't many tall buildings.

The effective range should be around 5 kilometers!

If 10 units are activated simultaneously, they can block all radio signals in Shanghai!

As long as the monitoring vehicle can detect the approximate area, it can block the signal in that area!

If enemy agents want to send messages even when their communications are blocked, they have no choice but to go elsewhere.

We can temporarily block all signals in the entire city.

As for whether he should be the first to send a telegram, he could flexibly control the timing.

However, enemy agents were unaware that there was no time for the shielding to be used.

We even blocked the radio signal.

They had to send telegrams to report to their superiors, receive instructions, and apply for funding.

Therefore, they had no choice but to look for places with a signal.

We can divide the city into several areas, leaving one or two areas unblocked for signal transmission.

Then came the meticulous door-to-door registration work.

Registering household registrations in advance will help us know who lives in each household.

Even an ordinary person, or even a newcomer, would recognize a face.

But those spies who hid to send telegrams weren't so familiar with their neighbors.

"We can spot spies among the new residents!"

Chen Huai'an blurted out all his thoughts in one breath.

Although it is still a process of elimination, the scope was narrowed down by signal shielding.

The original entire H city area was shrunk into a small area.

If we conduct a thorough population census, we can understand the movement of people.

Based on this, it becomes possible to identify who the enemy agent is who possesses the radio.

Without a radio, the spies would be like headless flies.

Not only will they be unable to receive instructions from their superiors, but their funding will also be cut off.

The reason why the Kuomintang reactionaries failed was that they lacked firm beliefs.

Once panic sets in, morale collapses.

Many spies would surrender voluntarily after hearing about the policy.

Moreover, these hastily deployed agents varied greatly in quality.

Many people join just to make a living, drawn by the money and the power to swagger around.

Now that morale has collapsed, they have no choice but to obediently surrender and strive for leniency.

This tactic was used during the liberation of Beiping (Beijing), and it was very effective.

Upon hearing the generous terms, the lurking spies all surrendered voluntarily.

The situation in Shanghai is now more difficult than in Beijing.

The radio station was blocked, and contact with superiors was lost.

In a climate of fear and uncertainty, many people will take the initiative to step forward.

As for those die-hards, they can be captured simply by keeping an eye on the area where the traps are set!

At that time, enemy agents will be unable to send messages in other parts of Shanghai, and the areas with signals will become traps.

When they're caught in a dilemma, it will be much easier to make the arrest.

It's better than now, where a large number of enemy agents have been captured, and the remaining die-hards have gone into hiding.

They also knew that if they evaded the monitoring vehicle, it would be very difficult to find them.

Fortunately, the Public Security Bureau, using the list provided by Chen Huai'an, arrested many key personnel overnight.

This was a significant blow to the lurking spies and served as a powerful deterrent!

Chen Huai'an's method is actually similar to Ding Yonghua's screening method.

Historically, the capture of Xu Hongchuan, the head of the Shanghai station of the Bureau of Investigation and Statistics, was also achieved using crude methods.

Only after a thorough investigation were clues discovered in the shantytown, leading to his arrest.

Now, with the help of a jammer, the original range has been reduced to one-tenth.

"That's great!" Ding Yonghua pumped his fist, his face beaming with excitement.

With the help of these treasures, he was confident that he could dig out all the hidden spies!

Zheng Changlin narrowed his eyes and a smile appeared on his face.

He had long admired the American technology for signal jamming.

Unfortunately, the Bureau of Investigation and Statistics only had detection technology, not interference technology, which is why they were unable to seize it from the transport captain.

Moreover, the jamming technology they possess only involves increasing the power to suppress the interference when radio waves are detected.

The effect was limited, and the technology was not very sophisticated.

Compared to the jammer in front of us, it's far inferior.

Even with today's American technology, jammers are enormous and consume a great deal of energy to operate.

Even if we give them to them, given the current power situation in H City, we still need to plan how to use them.

But this jammer is very lightweight; one person can carry it around.

It also consumes little power; it only needs to be charged for five hours on a civilian circuit board before it can be used again.

I couldn't help but marvel at how advanced the technology of later generations truly is!

At the same time, it's good to know that if the police use such advanced equipment, how terrifying must the military's equipment be?

Zheng Changlin put aside his emotions and immediately made a call to have the remaining 19 vehicles brought over.

Then he gave a brief greeting and went to the telecommunications department to send a telegram to the central government.

He wouldn't interfere when the police arrested spies.

However, Chen Huai'an's request had to be reported immediately.

I believe the central government would be happy to let him take up a position in the Public Security Bureau.

In this way, one has a stronger sense of belonging in this new world.

Chen Huai'an aspired to become a police officer, so he was naturally happy to cooperate with Ding Yonghua.

He stayed at the police station until evening before rubbing his stomach and laughing.

"Deputy Director Ding, how about coming to my place tonight? We can discuss this over dinner, what do you say?"