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[[File:Radio transmission waves(AM and FM).gif|thumbnail|The Audio Signal (top) is transmitted on a carrier wave by modifying the [[amplitude]] (middle) or [[frequency]] (bottom)]]
'''Amplitude modulation''' (AM) is one of the two ways information is transmitted and received wirelessly using [[electromagnetic radiation]]. To transmit data or [[analog]] audio, a constant [[electromagnetic]] wave (carrier wave) is first produced. Then the [[amplitude]] of this wave is modified in a specific pattern which may be translated back into audio or other data at the receiving end.
Amplitude modulated signals tent to travel line-of-sight from the source. They also can be interfered with by lightning<ref>http://stormhighway.com/sferics.php</ref>. For these reasons as well as others, [[frequency modulation]] is sometimes a preferred method of communication.
==References==
{{reflist}}
'''Amplitude modulation''' (AM) is one of the two ways information is transmitted and received wirelessly using [[electromagnetic radiation]]. To transmit data or [[analog]] audio, a constant [[electromagnetic]] wave (carrier wave) is first produced. Then the [[amplitude]] of this wave is modified in a specific pattern which may be translated back into audio or other data at the receiving end.
Amplitude modulated signals tent to travel line-of-sight from the source. They also can be interfered with by lightning<ref>http://stormhighway.com/sferics.php</ref>. For these reasons as well as others, [[frequency modulation]] is sometimes a preferred method of communication.
==References==
{{reflist}}