The Basics Part 5-3: Recognizing Bleed-Off

The receiver in Figure 33 shows another change in direction, but this time there’s another buried line that causes a problem. We anticipate that the electric line and the gas line run parallel to one another. But shortly after we change the gain setting on the receiver (Figure 34), we start to see that peak and null disagree, and that the compass is indicating a change in direction. The peak appears to be moving in a northward direction, moving closer to the gas line. Our peak reading is 78.1, but the peak reading in our null reading is 66.5, so peak and null do not agree (Figures 35-36).

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