Monitoring by a Single Individual.

Project Gutenberg EPUB3 edition Linebarger, Paul Myron Anthony
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The most likely situation for the isolated consul, businessman, officer, missionary, or amateur is one in which he can get a certain amount of stenographic help in taking down the broadcast material. The radio for monitoring varies in accordance with general reception conditions. Practically all the U. S. Army Signal Corps receivers will perform satisfactorily for local monitoring; so too will ordinary private sets, including the larger portables. An automobile radio can often be driven away from interference and from a hilltop or the edge of a lake can pick up a standard-wave station that cannot be distinguished on a much larger house set in the city. For transoceanic or world-wide reception, a short-wave receiver is of course necessary.
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It is unwise to pick a sample that involves too much rapid speech, such as a foreign soap opera. The best reception is almost always the Morse code transmission of news or the slow dictation-speed reading of news from one central station to outlying news offices or substations. Selection of a program which usually comes in, arrangement for a verbatim copy of the program, daily checking of the news under standard analysis procedures—this gives a very fair cross-section.
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One man sitting at Hankow could find out just what both the Generalissimo and the Chinese Communists were trying to tell the French-understanding and the Dutch-understanding listeners in the Far East. Another with pipe and slippers in Brussels could keep tab on the basic Russian lines to the Spanish-speaking world. Such monitoring obviously comes in handy for newspapers, commercial firms, governments, military establishments, speculators, and research institutions.

Source attribution

Psychological Warfare, Project Gutenberg eBook #48612

Radio. Identification: Propaganda vs. Truth.