My client Li Yunlong

Chapter 226 High-rate automatic frequency hopping!

"Beyond the existing theoretical system."

I mean, it’s something you can’t even think of! ····Naoto Matsuzaki rubbed his forehead.

This is not a good thing!

If it is some kind of design advancement, then the Empire can catch up quickly.

But if it is a basic transcendence.

Just like the mortars captured by the Empire from Tubal Road.

The imperial military industry department has no idea of ​​imitation at all.

Apart from anything else, even the navy could not find qualified gun barrel steel after searching all over the country.

This gap between materials and foundation is disappointing.

The Japs technical leader looked at Matsuzaki Naoto.

Matsuzaki Naoto suddenly shouted "Yoshi".

"but."

"Once every four point three seconds!"

The Japs technical leader spoke solemnly:

But Matsuzaki Naoto also had to admit that the underground organization on Tubal Road was very powerful.

Less than five seconds is incredible.

"The frequency hopping speed of the navigation signal is much faster than I expected. It is expected that voice calls may also have similar technology, which can achieve a frequency hopping in about five seconds."

"Hi, I'll contact Chief of Staff Watanabe right away."

The Japs technical leader took a deep breath and continued:
"But we still have a chance."

"If you want to achieve stable voice calls, even if the frequency is constantly changing, the signal must be stable. It cannot be turned on and off continuously, and it cannot fluctuate too much. Otherwise, clear voice information cannot be transmitted at all."

Imperial Radio actually also has a frequency hopping function, but even if the channels and frequency hopping rules are preset, the number of channels does not exceed ten, and they are operated by the most elite operators.

The Japs technical leader wiped his forehead.

"I need more equipment."

Matsuzaki Naoto nodded and said.

A Japanese technician replied.

Nowadays, it seems that it is no longer possible to use technical means to locate the Eighth Route Army's navigation signals, find the Eighth Route Army's navigation beacons, and uproot the Tubal Road lurking in Beiping.

The Jaap technical leader's eyes were fiery, as if he had returned to his youth, when he spent all night working on technical problems.

"What should we do next?"

And the enemy can actually jump once in less than five seconds when there are nearly a hundred channels.

"About once every four point three seconds."

but.

After Naoto Matsuzaki left, the Japs technical leader asked the technicians on the side.

"The enemy's equipment is technologically advanced beyond my imagination."

The nearly 100 preset channels are equally incredible.

But I have never seen the specific beacon like and where it is.

"I need more high-power stations."

"Unless I can find a physical object for me to study and determine their specific channel changing rules."

"Yoshi!"

"Less than five seconds?"

It can only jump once between fifteen seconds and twenty seconds.

"It's even difficult to locate the direction with a high probability."

"Have you analyzed their frequency hopping speed?"

incredible.

Only by other means.

"The ability to change frequencies at such a high frequency must have preset the channel changing rules in advance, but the signal appears for too short a time and fluctuates too much, making it impossible to track and locate."

Matsuzaki Naoto took a deep breath and continued to ask.

The gap is too big.

"There's really no way to locate the beacon."

"Voice calls and navigation information are different."

After fighting for several months, even in Beiping, the base camp of the North China Front, he has not taken advantage of it yet. He only knows that the Eighth Route Army uses a thing called a navigation beacon to provide navigation for transport aircraft.

But the warriors of the Imperial Locust Army are not afraid of difficulties and are brave enough to take on challenges.

···
"The so-called frequency hopping."

"Refers to a method of using pseudo-random code sequences for frequency shift keying to continuously jump the carrier frequency and expand the spectrum."

Yangcun.

Rarely, bosses, division commanders, chiefs of staff, brigade commanders, brigade and division staff officers, etc., the top leaders of the North China base area gathered together to listen to the teachings of an electronics expert.

Experts from the system.

Behind the brigade commander, there were Li Yunlong and Zhao Gang.

After the expert finished speaking, everyone was dumbfounded.

I understand every word.

But together, it becomes incomprehensible.

"It seems that I need to study harder in the future."

The teacher sighed with emotion.

"Yes, cultural education cannot be missing at any time."

"Not just ordinary soldiers, commanders and combatants, but we so-called intellectuals must not be left behind either."

The boss said.

"Technology is changing with each passing day, and there is no end to learning!"

The deputy general staff expressed the same emotion.

In fact, most of them know something about telecommunications technology. The headquarters organized a radio training class last year and selected some good talents from the entire army to train them in radio technology. They all attended it.

At that time, it only took them a week to roughly learn the principles of the radio and how to use it.

but now··

They don’t understand the knowledge taught by experts and professors.

The information booklet in hand was actually handed out last night, but they couldn't understand it either.

"For any communication, the sending and receiving must be on the same channel to complete the communication."

"Simple explanation."

"Frequency hopping means changing the communication channel." The expert continued:

"The main method of communication interference is to interfere with a certain channel or a certain range of spectrum."

"Frequency hopping is the best way to solve and prevent interference."

"As long as the frequency hopping speed is fast enough and the frequency hopping preset spectrum is fast enough, in theory, most communication interference and monitoring can be avoided."

"Due to technical limitations, the first-generation communication equipment was preset with 500 channels, which could achieve rapid manual frequency hopping, but there were problems with frequency matching, which affected communication efficiency and quality."

“Locating and interfering is actually not difficult.”

"The same goes for the first generation of navigation beacons."

"Compared to walkie-talkies, because there is no need for continuous communication, when a hundred channels are preset, it can be completely random, with frequency hopping every four and a half seconds."

"And it maintains continuous power on and off, and transmits high-frequency signal peaks in a short period of time to achieve interference resistance and monitoring and positioning."

"So, we have significantly upgraded the second-generation communication equipment."

"Through the integrated circuit, the microchip achieves a fast and automatic random frequency hopping function."

"However, limited by the performance of circuits and microchips, the current frequency hopping signal jump speed is not high, and it can only be..."

Hear this.

The brigade chief of staff subconsciously opened the information book in his hand.

He is considered the person who knows the most about communications among all the participants. When he was studying at a foreign university, he majored in radio communications, and his tutor was a top foreign communications expert.

Frequency hopping!

There have been relevant theories abroad for a long time.

It is indeed the most effective way to interfere with and monitor signals.

A very simple analogy explanation is that when the enemy ambush, change the marching route. As long as there are enough roads and the transfer is quick, it is impossible to be ambushed by the enemy.

But automatic frequency hopping is something I haven't even thought about.

Who will control automatic frequency hopping?

How to re-bind?

You must know that unlike marching, the purpose of a channel is to carry communication information, so both the transmitter and the receiver must be on the same channel.

And every time it hops, you have to reconnect.

How to ensure uninterrupted communication during this period?

The navigation signal can still be understood. After all, navigation can be delayed, but call delay is very fatal on the battlefield.

but!

"Fifty times a second."

When the brigade chief of staff looked at the information book in his hand and turned to the frequency hopping signal, the expert's voice also fell simultaneously:

"This speed is not safe. Even the first generation of radio jamming and listening equipment can be cracked and jammed through brute force."

Hearing this, the brigade chief of staff's eyes twitched.

Fifty seconds for each frequency jump,
That is, it jumps every 0.02 seconds.

At present, the countries with the strongest communication technology, the United States and Germany, want to monitor and interfere with a channel that only appears for 0.02 seconds at a time. It is estimated that it will take a long time, and large-scale professional equipment and a lot of manpower will be needed.

The kind that starts with forty or fifty communications experts.

Fifty channels.

Doesn't that mean that in order to interfere with and monitor each walkie-talkie, it is estimated to be a brigade scale, and the machinery and equipment are estimated to require millions or even tens of millions of dollars.

Isn't this safe?
The first-generation automatic frequency modulation technology from the 1970s shocked the brigade chief of staff.

"So, we have achieved frequency hopping a thousand times per second on third-generation communication equipment."

The expert's words behind him made the brigade chief of staff at a loss what to say.

"Great!"

He silently uttered two words.

···
When the meeting on the Independent Regiment ended, all the bosses went back to their headquarters in confusion.

Beiping,

"Signal found!"

A Japanese communications technician wearing a plaster turban shouted excitedly.

"Their communication signal was discovered!"

"Follow it immediately."

"Follow it immediately."

The technical leader with the rank of Lieutenant Colonel immediately gave the order, his voice filled with hysteria:

"Lock their channel."

Following his order, hundreds of Japs, including the front army's telecommunications team, more than a hundred radio stations, and seven large radio detection equipment were operated at full power at the same time.

The operator put on the earphones and slowly and carefully turned the knob to adjust the channel, trying to lock the Eighth Route Army's communication channel.

"Slow down, listen carefully."

After taking a few deep breaths and calming down, the technical leader with the rank of Lieutenant Colonel warned gently.

As long as the Eighth Route Army's communication channel is locked, the specific location can be located using triangulation.

then,

The complete Tubal Road communication equipment can be seized.

Thinking of this, the Japs technical leader's heart suddenly became hot.

Unlike weapons such as artillery, communications equipment is also very important in terms of design. Even if the enemy's components are of extremely high craftsmanship and the empire cannot copy them one-to-one, the empire can always learn something.

However, the hot mood lasted for ten minutes, and the Japs technical leader felt that something was not going well.

Ten minutes passed.

He gathered experts sent from the domestic base camp, as well as more than a hundred telecommunications experts from the North China Front Army and the Republic of China's dispatched army, plus radio stations from all the North China Front Army, and the latest domestically-made telecommunications positioning and monitoring equipment.

Not a single frequency was analyzed?
It stands to reason. It is only a matter of time before the Eighth Route Army's communication frequency is analyzed.

"what happened?"

Half an hour later, the Jaap technical leader finally couldn't bear it anymore and walked to a piece of equipment in person.

"them··"

At this time, the equipment operator was no longer looking at the control knob. There was a stack of drafts spread out on the table. Among the messy handwriting, a huge fifty stood out.

There were already big beads of sweat on his forehead, and he muttered one sentence repeatedly:

"How can it be"

"How can this be?"

"Fifty frequency changes per second?"

"How can this be?"

As he spoke, the devil tore open the scratch paper again and started calculating crazily again.

(End of this chapter)