File:Crystal radio tuning coil.jpg
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Crystal_radio_tuning_coil.jpg (677 × 436 pixels, file size: 37 KB, MIME type: image/jpeg)
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Summary[edit]
| Description |
English: Tuning coil used in early crystal radios from a 1914 radio book. The sliding contacts were used to adjust the inductance, allowing more or fewer turns of the coil into the circuit. This was called a "two slider" coil because it had two adjustable contacts that slid up and down the coil. In a crystal radio receiver, one was used to tune the receiver to different stations, while the other was used to adjust the antenna impedance matching. This sliding contact type of coil has the disadvantage that the slider usually short-circuited one or two turns of the coil. These acted as short-circuited transformer windings, and the high current induced in them caused power losses. So this type of coil was only used in cheap radios, and is obsolete now. |
| Date | |
| Source | Downloaded 2010-02-08 from Alfred Powell Morgan (1914) Wireless Telegraph Construction for Amateurs, 3rd Ed., D. Van Nostrand, New York, p.151, fig. 124 on Google Books |
| Author | Alfred Powell Morgan |
| Permission (Reusing this file) |
Public Domain in USA - published prior to 1923 in USA |
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:05, 10 March 2010 | | 677 × 436 (37 KB) | Chetvorno (talk | contribs) | {{Information |Description={{en|Tuning coil used in early Wikipedia:crystal radios }} |Source=Downloaded 2010-02-08 from {http://books.google.com/books?id=cBc9AAAAYAAJ&pg=PA151 Alfred Powell Morgan (1914) ''Wireless Telegraph Construction for Ama |
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