By Charles W., Jr. Carey, Ian C. Friedman
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5 (June/July 1979): 34. National Women’s History Project. Las Mujeres: Mexican American/Chicana Women. : National Women’s History Project, 1995. Barnum, P. T. ” Although no evidence exists to prove that P. T. Barnum actually said or wrote these words, they seem to fairly sum up his ethos during the early part of his show business career. For most of his later career, however, Barnum made sure his customers always got their money’s worth, even if what they were seeing was not always what it was purported to be.
Known as the superheterodyne circuit, this invention became a basic feature of VHF wave reception. Early commercial radio broadcasting impressed information on a carrier wave via amplitude modulation (AM), which varies the carrier wave’s power. AM signals can be sent long distances and are perfectly suited for simple broadcasts such as talking or unaccompanied singing. However, AM is not well-suited for complex broadcasts such as a symphonic performance, and it is easily disrupted by static from electrical storms and random electric interference from machines.
AM signals can be sent long distances and are perfectly suited for simple broadcasts such as talking or unaccompanied singing. However, AM is not well-suited for complex broadcasts such as a symphonic performance, and it is easily disrupted by static from electrical storms and random electric interference from machines. After the war, Armstrong drew on his work with VHF to develop a new way to modulate carrier waves. By 1933 he had fully developed frequency modulation (FM). This process varies the carrier wave’s frequency, or how many individual waves are transmitted per second.
American Inventors, Entrepreneurs, and Business Visionaries (Facts on File Library of American History) by Charles W., Jr. Carey, Ian C. Friedman