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EMC problem (excessive field strength)
An EMC problem (or Electromagnetic compatibility problem) occurs when one piece of electronic equipment or an electromagnetic system is adversely affected the operation of another.
One example might be breakthrough by the high field strengths produced by a nearby radio transmitter. EMC problems are not always due to defects in the transmitter, and so do not necessarily require improvements in the radio transmitter design, such as reducing its radiated harmonics. It may be that the immunity of the affected equipment is poor due to inadequate shielding, or filtering of sensitive inputs. EMC problems can have a range of effects on equipment, and there are ways to mitigate or eliminate them in practice. Effective EMC mitigation techniques may differ by the type of equipment that malfunctions, and by the nature of the strong radio frequency field.
== Singing sparks and allied effects ==
The singing spark can be thought of as the ultimate form of the rusty bolt effect. This is a situation where the output of a transmitter is clean, the receiver is able to reject the transmitter's frequency but some object energised by the RF field is then able to generate harmonics or act as a non-linear mixer which generates intermodulation products.
To solve this the best thing to do is to locate the ''rusty bolt'' and either remove it or render it harmless. Possible examples of rusty bolts include the pole holding an aerial, cast iron drainpipes, loose manhole covers and guy wires on radio masts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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