Overview

Important components for early day radio receivers are described, including reviews of their development and applications. In the case of inductance coils, design formulas are given for the types most often used, and these can be applied by today's experimenters and restorers for a wide range of equipment, both early and modern. Coil design has been much influenced by the changing requirements that accompanied improvement of receivers, and this is discussed in some detail, explaining why some more modern types were initially unacceptable, even though they later replaced previous designs. Variable capacitors for tuning purposes are closely linked to radio development, beginning early in the wireless telegraphy period and eventually becoming the dominant method for receiver tuning applications. Close attention is given to such development and to why the almost universally used design evolved. Other types that were used at first are discussed, including unique forms which were unable to overcome the trend that accompanied early broadcast radio improvement. The crystal detector shared the detector function with other methods during the wireless telegraphy period, and its particular advantages and drawbacks in the era of spark transmission are covered. Choice of materials changed during later years, and then crystals were virtually discarded until a brief revival of popularity occurred during early broadcasting. The many varieties of minerals and man-made products from the wide range of resulting applications are listed, along with the unique properties of each composition, where such information is available.

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9781478784968

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