weknowthewor Posted March 3, 2007 Share Posted March 3, 2007 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??? Link to comment Share on other sites More sharing options...
YT2095 Posted March 3, 2007 Share Posted March 3, 2007 FM Will pick the same noise as well, IF it were operating in the same band (<2MHz). Link to comment Share on other sites More sharing options...
Externet Posted March 4, 2007 Share Posted March 4, 2007 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 Link to comment Share on other sites More sharing options...
YT2095 Posted March 4, 2007 Share Posted March 4, 2007 they are NOT just changes in Amplitude (sorry and all that) this type of interference is White Noise, and therefore Frequency Modulated too. Link to comment Share on other sites More sharing options...
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