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Re: fluorescent light interference
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Posted by MikeH-Tx on November 20, 2003 at 17:24:42 from (24.243.238.118):
In Reply to: fluorescent light interference posted by Scott on November 20, 2003 at 16:32:53:
Any energy on the frequency that an AM radio is tuned to
will cause interference. This is because AM is amplitude
modulation, meaning a strong signal sounds louder than a
weak signal (amplitude). This includes all signals, good
and bad. Florescents are energized by changes in
amplitude of the voltage driving them. Thus, they seem
very similar to AM signals and cause interference. On an FM radio, volume in a radio is determined by how the
frequency changes, not how the signal strength changes.
This helps FM to be better in fidelity, but worse in range of
reception. (Modulation is not the only factor in reception
distance.) It also makes many common interference signals
to be no issue. Thus, FM is typically quieter than AM,
because there are many more interference mechanisms for
AM than for FM.
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