A month after that massive nighttime raid, Huang Zhongxin moved away and was never seen again.
Following his old method, Ning Zhiheng gathered all the neighbors who had seen Huang Zhongxin together, took out paper and pen, and began to sketch a portrait of Huang Zhongxin based on their descriptions.
The more people described, the more accurate the portrait would be. It took nearly two hours to finally complete Huang Zhongxin's portrait.
After a brief two-hour encounter, the neighbors had lowered their guard and nodded in agreement as they looked at the portrait, unanimously agreeing that it was almost indistinguishable from the real person.
It seems that this portrait was very successful. Based on it, Ning Zhiheng has been able to grasp the most direct clues, greatly saving many unnecessary steps. Finding Huang Zhongxin is only a matter of time.
Ning Zhiheng returned to his office after finishing his work and immediately picked up the phone to call the telecommunications department.
When the telecommunications department received Ning Zhiheng's call, someone immediately rushed over.
A knock sounded at the door, and Ning Zhiheng said, "Come in." The person who pushed the door open was Bian Deshou, the major and team leader of the Telecommunications Department.
In just a few months, Bian Deshou's complexion had become much rosier. The Telecommunications Section's status within the Military Intelligence Investigation Department had been greatly enhanced, and many advanced instruments had been purchased. The number of personnel and equipment had doubled. The Director bluntly stated that future investment in the Telecommunications Section would be significantly increased.
Bian Deshou's life is getting better and better these days, so of course he rushed over as soon as he heard Ning Zhiheng's call.
"Team Leader Bian, I'm so sorry to trouble you to come all this way." Ning Zhiheng stood up to greet him, invited Bian Deshou to sit down on the sofa, and then placed the listening recording in front of him.
"As for that, Team Leader Ning instructed us to come over no matter how busy we were. What's wrong? Is it about the wiretapping records?" Bian Deshou said with a smile.
Ning Zhiheng nodded and said, "I do have some questions. As you know, I'm not very knowledgeable in this area, so I'd appreciate it if Team Leader Bian could enlighten me!"
Bian Deshou readily agreed, "I will definitely tell you everything I know!"
Ning Zhiheng pointed to the listening records and said, "There is one of these radio signals that we have come into contact with before. The intelligence department almost caught him, but we failed and he got away."
The listening logs show that it reappeared near the paint shop seven days ago. I'm wondering if we can pinpoint its exact location the next time it appears?
Bian Deshou took the wiretapping record, which contained the information he was responsible for monitoring, and the situation was very clear.
Hearing Ning Zhiheng's words, he couldn't help but smile bitterly and said to Ning Zhiheng, "Team Leader Ning, what you said is really difficult for us to do."
He sat up straight and carefully explained to Ning Zhiheng: "Although our technical capabilities have improved significantly, we still cannot pinpoint the exact location of radio signals. Moreover, there are simply too many radio stations in Nanjing, and the radio waves are too complex. Our equipment cannot quickly search for and locate a particular signal unless we know the approximate location and time of its appearance, move the equipment to a nearby position, and wait for its appearance. This distance cannot be too far, otherwise it will be difficult to determine the location."
Last April, Team Leader Yu from the Intelligence Section did just that. We spent a lot of effort transferring the equipment there, and then spent two months gradually eliminating other radio interference, locking onto it, and figuring out its transmission patterns.”
Ning Zhiheng knew immediately that his request was a bit excessive, and asked again, "This radio wave appeared in Black Corridor Street before. Is there any record of it being monitored? Has its transmission frequency changed? Is it still once every ten days?"
Bian Deshou spread his hands and said helplessly, "After the Black Corridor Street appeared, its transmission frequency changed a lot, and its transmission time was too short. We did not grasp the transmission pattern, and we could not guarantee that there would be any missed reports. After all, we need to monitor too many radio stations. You probably don't know that just operating one set of monitoring equipment requires at least a dozen to twenty telecommunications personnel. Our work is already very heavy. The limitations of manpower and equipment make it impossible for us to do it with such precision."
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