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interference

weknowthewor
in Engineering

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i have a radio having am and fm. while listening to am, when an automobile starts, i hear some noise, this is notthe case with fm, is there any principle behind this???

FM Will pick the same noise as well, IF it were operating in the same band (<2MHz).

Sparks, spikes and electrical noise from an automobile engine are changes in amplitude or amplitude modulation AM

Changes in amplitude are ignored by a frequency modulated FM receiver.

Miguel

they are NOT just changes in Amplitude (sorry and all that) this type of interference is White Noise, and therefore Frequency Modulated too.

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