July 2017
Intermediate to advanced
1988 pages
112h 28m
English
Content preview from National Association of Broadcasters Engineering Handbook, 11th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter7.4
AM Radio Broadcasting
The earliest form of wireless audio delivery employed amplitude modulation (AM). Transmitters used vacuum tubes to generate a carrier upon which audio was impressed by various means with high-level plate modulation being the most popular. AM broadcast signals propagate via groundwave during daylight hours and also via ionospheric reflection during nighttime hours. This reflection causes AM stations to be heard at great distances from the transmission site.
In MM Docket 87–267 FCC divided the Standard Broadcast Band (535–1705 kHz) into three categories: clear, regional and local channels. Four Classes of stations were defined. These Classes are Class A, Class B, ...
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