Fan Keqin said: "But he didn't dare not confirm it because he was afraid of missing a key task. So he definitely had to contact the Shanghai headquarters. After receiving the telegram, the Shanghai headquarters would confirm the situation and then reply to him. Then he

I sent and received twice, so I thought I could do something with this."

Fan Keqin then looked at Han Qiang and said, "But what you said just now is still very vague, so my idea is obviously not very valid."

Han Qiang waved his hand and said: "It cannot be said that it is not true, but it is still true. We can set up multi-point direction finding and zoned blackout methods in advance to narrow the scope of suspicion."

When it comes to professional technology, Fan Keqin is not sure. He understands what multi-point direction finding means. Because this technology has another name, called triangulation positioning technology. In fact, this is just a difference in name. But in the end

He didn't know how to do it. After all, he was not a professional in this field. So he asked, "How to arrange it?"

Without thinking about it, Han Qiang replied: "If we can really induce him to send a report, we can narrow down the scope through targeted arrangements. For example, I have arranged listening points and surveillance points in three different directions in our city in advance.

technical group, and you appeared in the newspaper recently, or

The reporter said that the radio station that is active must be the spy that the encrypted message is to contact. Then my technicians will do their best to calculate a line with the strongest signal, and three line segments will be drawn in three directions.

The place where they meet is the area where the radio station is located."

After hearing this, Qian Jinxun couldn't help but ask: "Why didn't you use this method before?"

Han Qiang said: "I have used it, and have been using it. This technology is not actually a very powerful method at home and abroad, but it is almost the only method now. Anyone who is engaged in technology can basically do it. Why did I apply in the early stage

With so much money, it has basically been established in every district in the city.

Secret listening point. But then again, little Japan is not a vegetarian. They naturally know the means of counter-reconnaissance. They shorten the transmission time, even move the transmission location, and some only appear once and then hide it.

This is a way to limit multi-point direction finding, and it is difficult to really catch them."

After hearing his answer, Qian Jinxun nodded understandingly and said, "Then... what Keqin just said, can you handle it?"

Han Qiang said: "It should be possible, because the previous monitoring was passive monitoring, which is the monitoring point we set up. Although we are constantly listening to various signals over our city, as long as the other party does not turn on the phone or send a report, then it will be a little bit

There is no way. And we don’t know when the other party will turn on the phone and send the message, so the suddenness is too strong and we may not have time to react.

It was already over. But this time it was different. The method Keqin mentioned, by getting some symbols in the wrong order, was published in the People's Daily. The other party felt familiar and unfamiliar after reading it, so he had to send a report to inquire about the situation.

Therefore, this means that we can control the other party's transmission time. If we prepare in advance, I think it will not be a problem to come up with a general area."

Fan Keqin asked: "If we prepare now and publish it in the newspaper the day after tomorrow, what kind of scope can we narrow it down to?"

Han Qiang thought for a while and said: "If the other party is indeed in the urban area, I think it should be fine to reduce it to one-third of the area. It depends on the length of his report. The longer the time, the smaller the range."

Fan Keqin said: "One-third of the district? That range is still a bit large."

Han Qiang said: "I am just making an estimate now. I don't know the details. It may be smaller, but it may also be larger."

Fan Keqin thought of this, looked at Qian Jinxun, and said: "How about it? Give it a try?"

Qian Jinxun thought about it and said, "If we try it once, what should we do next? Directly blockade the area, implement martial law, and conduct door-to-door searches?"

Fan Keqin said: "No! He sent the letter once and received it again. We have two chances." Then he looked at Han Qiang and said: "You just mentioned a blackout method, how do you do that?"

Han Qiang explained: "After using multi-point direction finding, we determined an area. Then, we can divide this area into several smaller areas, and when the other party receives the telegram, we will power these areas in sequence.

If the signal in the power-pushing area stops when power is being pulled, it means the target must be there."

After hearing this, Fan Keqin nodded and said: "Then we really can't rush this. We must arrange it in advance and coordinate all aspects before we can start."

Qian Jinxun said: "Old Han should be able to solve this problem. You first arrange multi-point direction finding, tell Keqin when you are ready, and then he publishes the news. When the other party sends the report, you can use this method to lock an area, and then coordinate immediately

The Electric Power Bureau will divide the power grid in that area. Let Lao Han's technical team pull out dedicated lines as quickly as possible and take over all of them.

Then each person will guard a line, and when the other party receives a call back, ask them to immediately dial the divided regional line and pull down the power switch in turn. I believe that three or four seconds of power outage in each area is enough. Even if it is divided into

Ten districts, it’s less than a minute? Unless the other party’s message is very short and the phone is turned off immediately, otherwise... we will definitely be able to find him.”

Fan Keqin nodded and said: "It's feasible." Then he looked at Han Qiang. Han Qiang nodded and said: "Just do it this way, I think it's okay."

With a way to deal with the matter, the three of them finally relaxed a little. Qian Jinxun gave everyone a cigarette again and said: "Keqin, when do you think the news should be published?"

Fan Keqin thought for a moment and said: "Yoshimune Yamaguchi has been hiding in the Sun God Restaurant for so long without showing up, which shows that this mission requires accuracy, not speed. In addition, he also made it clear when he was interrogating him.

, then... the time can be placed in ten days. From the time he arrived in the local area to the completion of the task, it will be more than a month and a half, neither too fast nor too slow, so there should be no questions. "

Han Qiang said from the side: "That's great. Although the monitoring points in each district are ready-made, I still need to arrange them more rigorously to achieve the best effect. Ten days is enough, I only use one

Just two days."

Qian Jinxun flicked the ashes of his cigarette and said, "Let's discuss the details again. Can we go directly to the stage of turning on the switch the first time?"
Chapter completed!