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National Association of Broadcasters Engineering Handbook, 11th Edition by Garrison C. Cavell

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Chapter7.5

Medium Wave (AM) Transmitters

Jeff O. Welton

Nautel Limited

John Stanley

Generating the Radio Frequency Signal

Virtually all AM transmitters installed in the last decades have used solid state technology that will be discussed later in this chapter. However, many stations still maintain older transmitters using tubes. There are still some places where tubes are being used in currently manufactured equipment such as high-power shortwave and FM transmitters. The vacuum tube can be compared to the field effect transistor that is its closest solid state counterpart. Except for the very oldest transmitters, the low-level stages will use transistors, even if the high-power stages use tubes. Therefore, this discussion will center on the final ...

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