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File:Crystal radio receiver from wireless era.png

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English: Early crystal radio receiver built by a radio amateur in Belfast, Ireland, during the pioneering wireless telegraphy era of radio around the first decade of the 20th century, showing examples of the early electronic components used. From a 1914 radio book. This example is a sophisticated inductively-coupled type, with an air-core antenna coupling transformer (called a loose coupler) to improve selectivity (Q factor) by adjusting the inductive coupling. This was used to receive long wave (148 - 283 kHz) radiotelegraphy broadcasts. Alterations to image: Added colored labels. The labelled parts are identified on p. 264 of the source text as:

(1) Adjustable antenna coupling transformer, called a "loose coupler". The secondary coil, visible on the right, slides in and out of the primary coil in the box, to adjust the coupling of the antenna to improve selectivity. The switches on the front of the box select taps on the coil to adjust the impedance match between the antenna and the receiver
(2) Primary (antenna) tuning capacitor, 8 nF max, only used on lower part of band
(3) Secondary tuning capacitor
(4) Antenna loading coil, 15 mH, only used on lower part of band
(5) Crystal detector, "Perikon" (zincite-chalcopyrite junction) type
(6) Spare crystal detector
(7) Blocking capacitor, 8 nF

(8) Earphones, electromagnetic type, 8000 ohm
Date
Source Downloaded 2009-11-14 from Rupert Stanley (1914) Textbook on Wireless Telegraphy, Vol. 1, Longmans Green & Co., New York, p.265, fig. 151 on Google Books
Author Rupert Stanley
Permission
(Reusing this file)		 Public domain in USA - published in USA prior to 1923

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current10:15, 26 November 2009Thumbnail for version as of 10:15, 26 November 20091,592 × 889 (350 KB)Chetvorno{{Information |Description={{en|Wikipedia:Crystal radio receiver from the wireless era.}} |Source=Downloaded 2009-11-14 from Rupert Stanley (1914) ''Textbook on Wireless Telegraphy, Vol. 1'', Longmans Green & Co., New York, p.265, fig. 151 on Goo

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