. 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 . telephone is actu-ated at an audible frequency. In the case of undamped waves, which are produced ina different manner and received by more elaborate re-ceiving equipment, it is also necessary to bring the inter-cepted waves down to audibility. In the reception of con-tinuous wave radio
. 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 . telephone is actu-ated at an audible frequency. In the case of undamped waves, which are produced ina different manner and received by more elaborate re-ceiving equipment, it is also necessary to bring the inter-cepted waves down to audibility. In the reception of con-tinuous wave radio telephony, however, the waves aremodulated or altered by the impressed telephonic char-acteristics, and while the receiver may not make the actual RADIO FOR EVERYBODY 19 waves themselves audible because of their high frequen-cies, it does make audible the fluctuating potential of thewaves and reproduces the sounds uttered at the trans-mitter. In other words, it does not concern itself withthe carrier waves, but only with the sounds carried. Fitting the Radio Apparatus to the Task in Hand In entering upon radio as a hobby, the beginner isconfronted with a question of choice of apparatus. Thushe can buy the parts and build his own receiving set andtransmitter; he can buy the separate pieces of apparatus,. Diagrammatic explanation of why a detector detects radiowaves. Tlie liigh frequency current produced by tlie inter-cepted wave is shown in the upper half of the diagram, Tvhilethe lower half shows how the detector, being a one-wayconductor, only permits half the current to flow^ through,therefore making it a direct current, which affects the tele-phone reeiver. Certain factors cause the individual pulsationsof a wave train or group to slur into one note in the tele-phone receiver. Therefore, there is one sound for each trainor group of waves. all finished and ready to be connected with other instru-ments so as to form a complete set; or he can buy a com-plete receiving set and
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
