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, and 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 valid."
Han Qiang waved his hand and said: "It cannot be said that it is not established, but it is still established. 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 skills, Fan Keqin is not sure. He understands what multi-point direction finding means. Because this technology also has another name, called triangulation technology. In fact, this is just a difference in name. But 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 still narrow the scope with targeted arrangements. For example, I have arranged listening points and surveillance points in three different directions in our city in advance. Technical team, after you publish it in the newspaper, the radio station that has recently appeared, or become active, must be the spy to be contacted by the encrypted message. Then my technicians will work hard to calculate a radio station with the strongest signal. Lines, and three line segments will be drawn in three directions, and the place where these line segments intersect 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 I 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, secret monitoring points have been basically established in every district of the city. But then again, Little Japan is not a vegetarian, and they naturally know the means of counter-reconnaissance. Shorten the transmission time, and even use mobile transmission Report the location, and some only appear once and then hide. 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 said just now, 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 turns on the phone and sends the report, so the suddenness is too strong, and the other party may have finished it before we have time to react. But this time is different. The method Keqin said is wrong. The order of the symbols and so on were published in the People's Daily. The other party looked familiar and unfamiliar, so he had to send a report to inquire about the situation. Therefore, this means that we can control the other party's sending time. If we prepare in advance, we It’s not a problem to figure out a general area.”
Fan Keqin asked: "If we prepare now, and I publish it in the newspaper the day after tomorrow, what kind of scope can I 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 specifics. 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 pulling area stops when the power is being pulled, that 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: "This old Han should be able to solve it. 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 divides the power grid in that area. Then let Lao Han's technical team pull out dedicated lines as quickly as possible and pick them all up. Then each person will guard a line and ask them to call immediately when the other party receives a call back. Divide the regional dedicated lines and pull down the switches one by one. I believe that three or four seconds of power outage in each area is enough. Even if it is divided into ten areas, it will be less than one minute? Unless the other party's message is extremely short and the power is shut down 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 immediately 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 while and said: "Yoshimune Yamaguchi has been hiding in the Sun God Restaurant for so long without showing his head, which shows that this task 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 cigarette ashes and said, "Let's discuss the details again. Can we go directly to the stage of turning on the switch the first time?"
Han Qiang thought about it and said, "It's possible, but I'm afraid..."
