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.
Read more about this topic: EMC Problem (excessive Field Strength)
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