Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development (1922)
Drinker, Frederick E. [from old catalog], Lewis, James G., [from old catalog] joint author · [Philadelphia, Printed by National publishing co.] · leaf 330
ed to generate such local oscillations. This instrumentis usually called a heterodyne. Compare the circuits offigure 44 and figure 41, both of which are designed togenerate oscillations. The main oscillating circuit is thecircuit containing L and C, and the frequency of this cir-cuit determines the… … oscillations are fed into the regular receiving circuits bymeans of a few turns, K, of the antenna lead-in wire,which make the coupling with the coil L. In many heter-odynes no special arrangements are made for couplingthe heterodyne to the other circuits, as it is found that itis sufficiently…
Radio
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