I had a piece of test equipment fail on me today. It was reading anywhere from -30dB to -70dB down from the levels it should have. I figured out that the cable between one part and another was broken. There was no physical contact at all, and the signal was still passing - though it was greatly attenuated at lower frequencies. There was NO physical connection and the signal was still going through at a useful level! Witchcraft I tell you. Repairing the cable made it work all better again.
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*little-known because I just made it up.
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