Light dimmers

A lot of homes are equipped with dimmers instead of switches to control the lighting. These devices are based on silicon-ron trolled rectifiers (SORs) tliat cut the ac sine wave off over part of its cycle, producing a harmonic-rich sharp waveform. These devices can produce a sound described as frying eggs" well into the shortwave spectrum. Diagnosis is simple: turn off the light. If the noise stops when the light is turned off, then the dimmer is at fauji. Although it is possible to install LC line noise filters at the dimmer, that approach is not usually feasible. \\ would be better to (a) remove the dimmer and replace it with an on/off switch, (b) replace the dimmer with a special model that is designed to suppress radio noise, or (r) keep the light turned off when using the receiver.

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