. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . cribed lateron in this chapter, the sensitiveness of the vacuum tube isso much superior to the crystal detector as to make acomparison quite out of order. The wiring scheme already shown gives the fundamen-tals of vacuum tube hook-ups when used as a will be noted that a smal
. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . cribed lateron in this chapter, the sensitiveness of the vacuum tube isso much superior to the crystal detector as to make acomparison quite out of order. The wiring scheme already shown gives the fundamen-tals of vacuum tube hook-ups when used as a will be noted that a small fixed condenser and an ex-tremely high resistance, known as a grid leak, are placedin series with the tuner. Furthermore, the polarity ofthe connections is of utmost importance. Primary and Secondary Circuits and How They AreCoupled So far, the circuits have been of the simplest type, witha physical connection between the aerial-ground circuitand the closed circuit, known as the oscillating circuit, inwhich the detector is placed. Now for reasons which neednot be explained here, since this work does not attemptto concern itself with the theories or the mathematics ofradio but rather with the application of the results, manysets make use of distinct aerial-ground and oscillating 130 RADIO FOR EVERYBODY. Loose-coupler of the old type which has now become more or less obsolete. circuits, with no physical connection between them. Trans-ference of energy between the former and the latter iseffected by means of two windings which are brought intomore or less close inductive relation. In one form thesewindings are known as a loose-coupler, in another they form a vario-coupler, still an-other arrangement calls forcompact coils held in hingedholders so that they may beswung towards or away fromeach other. The loose-coupler is theforerunner of the v a r i o -coupler and the compact coilarrangement. It consists of alarge tube on which are woundmany turns of wire, which isthe primary and
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
