What does XM Radio stand for?

ANSWERS: 1

Official Know-It-All

In radio terms, XM stands for no modulation, whereas AM stands for amplitude modulation and FM stands for frequency modulation. XM radio programs are digitized and compressed before being transmitted to a geostationary satellite. The satellite then reflects the signal back to special XM antennas and receivers on Earth.
Source:
Free Dictionary: XM
Life123: How Does XM Radio Work?
Connexions: Frequency Modulation (FM) Mathematics

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