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 After about 1920, receivers using crystal detectors were largely superseded by the first amplifying receivers, which used vacuum tubes. 9.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