| 1. | The detector can be a crystal detector or a Schottky barrier diode.
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| 2. | It was further developed by Guglielmo Marconi, then replaced about 1907 by crystal detectors.
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| 3. | Receivers could be made with a tuned circuit, a crystal detector, and a headphone.
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| 4. | The electric field strength is commonly measured using a crystal detector or Schottky barrier diode.
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| 5. | Both required crystal detectors in their receivers, and a crash program to develop them began.
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| 6. | Prior to the introduction of the Audion, radio receivers had used a variety of barretters, and crystal detectors.
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| 7. | The two Geiger-M�ller tubes and the caesium iodide crystal detectors continued to operate normally until September 19, 1958.
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| 8. | After about 1920, receivers using crystal detectors were largely superseded by the first amplifying receivers, which used vacuum tubes.
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| 9. | Radio had been an exotic magic controlled by the military and a few geeky hobbyists experimenting with crystal detectors and coils.
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| 10. | On August 30, 1906, Greenleaf Whittier Pickard filed a patent for a silicon crystal detector, which was granted on November 20, 1906.
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