![]() ![]() ![]() Cornell, W8EFW, who wrote of a design he used in the Pacific in It was one of the first such articles that mentioned using a pencil lead for a contact. A non-linear resistance property of the blued steel of razor blades, foreshadowing the same property that would later be discovered in semiconductor diode junctions, along with the ready availability of blued steel razor blades, led to the use of razor blades as a detector in the crystal set AM radios which were often built by soldiers during World War II.ĥ Background Among those was young Lieutenant Paul M. Here is a chance for you to take a step back in history.Ĥ Background Historically, razor blades were often blued steel. ![]() Amazingly enough, these radios did not require electricity or any other power source. Word spread, and soon scores of soldiers were creating their own radios. A few clever radio- deprived GIs figured out that they could use miscellaneous scrap metal and junk to construct a simple radio. Because of this, it was forbidden to use portable superhets on the front.ģ Background During World War II, GIs were often isolated from hearing the day- to- day news of what was happening beyond their barracks. They could use these devices to “home in” on the locations of the Allied emplacements in order to direct artillery and aircraft fire. Also, the Germans had sensitive, radio direction finders that could pick up the local oscillators of superheterodyne portable receivers. In the early 1940s, tube type portable radios were fairly large and used short-lived, expensive batteries that would have been hard to find in the field. LIMARC PRESENTATION November 2013 Ron P Milione Ph.D.Ģ GI's, during World War Two, These radios were essentially crystal sets that used blue razor blades for detectors because crystals were almost impossible to obtain under the conditions the G.I.s faced in those days. Presentation on theme: "Building a FOXHOLE Radio"- Presentation transcript: ![]()
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