第11章 入夜

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着干裂的泥土地面和碎石子路,每一步都注意避开松散的土块和枯枝。陆维桢跟在周承岳后面大约三步,顾晏断后,她的频谱仪天线已经展开了一小节,顶端收着电波,屏幕显示着实时背景噪声。
    配电房的轮廓在月色下显出来,是一间约四米见方的砖混小屋,屋檐下没有灯,配电房外侧的电线杆顶端有一盏路灯亮着发出昏黄的光,灯罩积了灰,照在地面上的光斑模糊而边缘不清。三人绕到配电房北侧,地面上果然有一块铸铁井盖,直径约六十厘米。井盖边缘的颜色确实比周边地面浅了一圈——去年粉刷时被遗漏的油漆痕迹,在路灯余光的照射下形成了一个隐约的环状分界线。
    陆维桢蹲在井盖旁边用手电筒照了一圈边缘。井盖的铸铁表面覆盖着一层薄薄的泥土,但盖沿和井圈之间的缝隙里泥土分布不均——东侧的缝隙比西侧宽约半毫米,有被撬起过之后重新放回时没有完全对正造成的偏移。他用手套垫着指腹沿缝隙摸了一圈,触觉反馈告诉他这口井盖最近两天之内被打开过至少一次。
    (本章未完,请点击下一页继续阅读)第11章入夜(第2/2页)
    周承岳蹲在对面,手里捏着一把工具钳轻轻地卡入缝隙向上施加压力。井盖被抬起了一道窄缝,边缘和井圈之间发出轻微的铸铁摩擦声。他停住,侧耳听了听下方。没有异常的声音。然后他把井盖缓缓抬起到足够一人侧身进入的角度,用一块石头抵住边缘以防它回落。下面的通风管道内壁是水泥材质,直径约八十厘米,壁面上有一层浅灰色的积尘。积尘表面有几道不规则的拖拽痕迹延伸到黑暗深处,末端消失在管道的弧形拐角后面。
    顾晏把频谱仪的天线指向管道入口方向,屏幕上的读数微微跳动了一下。她蹲下来把天线探入管口约三十厘米,读数的跳动幅度增大了。“里面确实有和门禁卡同频的信号残余,“她说,“微弱但持续,频率吻合。像是卡本身仍然在通电状态,有内置电池。位置大概在管道前方二十到二十五米处,拐角后面。“
    陆维桢准备侧身进入管道,周承岳按了一下他的肩膀。“你走我后面。“他说完先侧身滑入了管口,身体贴着管壁内侧的曲面缓慢向里挪动。陆维桢跟进去,然后是顾晏。三人在水泥管道里弯腰前进,手电筒的光束在前方的壁面上照出一个圆弧形的亮斑,管道内壁的积尘在手电光下呈现出细微的颗粒纹理。
    管道前进了大约十几米后向左拐了一个接近直角的弯。拐过弯之后前方约五米处的管壁上有一个金属盖板,尺寸跟手掌差不多,表面覆盖着一层防尘棉垫。金属盖板边缘有一根极细的数据线延伸到管道侧壁的缝隙里消失不见。盖板本身微微鼓起的轮廓表明下面有物体被固定在内壁上。
    陆维桢侧身挤过去,用手电照向金属盖板。盖板表面的防尘棉垫被揭开过,边缘还留着新指纹的油脂印记,指纹清晰完整。他用指甲轻轻撬开盖板的扣锁,里面嵌着一只约信用卡一半大小的黑色塑料盒子,盒体侧面引出了三根极细的线缆。盒子背面贴着一张贴纸,上面手写着一行编号:ECHO-7-ACC-04。
    他认出了“ECHO-7“这个前缀。在他第一次被张启明特招后,系统曾截获过一份来自大洋彼岸的情报报告,编号就是ECHO-7。此刻他面前这个盒子的编号后缀中也有ECHO-7,中间字段ACC意味着“附属通信装置“。
    “这是暗潮的前端信号收集器。“陆维桢压低声音说,“它的三根线缆分别通往管道侧壁的缝隙里——一根接电源,一根接天线延伸段,一根负责数据回传。如果把它拆下来,后面接的两根线缆如果没有新负载会立刻导致回传线路开路,触发远端的掉线警报。“
    顾晏从后面挤过来用手电照了照盒子的底部结构,低声说:“它在通过管道侧壁的原生线缆偷电。这根线原本属于管道内部的防结露伴热带的供电回路,被中间分接了一路。“
    陆维桢盯着盒子看了几秒。他能拆掉它,但拆的同时需要做一个负载模拟器接在原位上——让那两根线缆仍然感知到一个正常的电气连接状态,系统不会认为掉线了。做一个负载模拟器需要电阻、电容、一小块运算放大器和十五分钟的时间。
    但他手里的材料只有顾晏挎包里那台频谱仪和几卷备用的细导线。
    “做负载模拟器。“陆维桢侧头对顾晏说,“你包里应该有电阻和运放芯片。“
    顾晏从背包里摸出一个零件盒,里面各种阻值的贴片电阻用密封条分格装好。“你需要多少?“
    “匹配线缆负载,不用完美匹配,只需要让远端检测不到开路就行。“陆维桢伸出手,“四十七千欧电阻,一微法电容,一块单运放,接成电压跟随器。“
    顾晏把零件递过来的动作精准到像在手术台上传递器械。陆维桢接过来蹲在管道里就着手电光开始焊接。他的手没有抖动,焊枪尖
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