. 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 . ssary. The first step is to tune the an-tenna-ground circuit so as to bring it into harmony orresonance with the desired waves. When this is done,the waves flow down from the antenna to the may be diverted into suitable receiving apparatus bythe s^mple arrangement shown in t
. 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 . ssary. The first step is to tune the an-tenna-ground circuit so as to bring it into harmony orresonance with the desired waves. When this is done,the waves flow down from the antenna to the may be diverted into suitable receiving apparatus bythe s^mple arrangement shown in the accompanying il-lustr^ ion. However, even when they are diverted in this 18 RADIO FOR EVERYBODY manner, they are of frequencies of the order of severalthousand cycles, and will not produce any sounds in theusual telephone receiver because they are beyond therange of audibility. But remember, the waves are intrains or groups. By making use of a device that canconvert these trains or groups into direct current—currentflowing in only one direction, we secure a series of im-pulses flowing in one direction. The device which accom-plishes this purpose is known as the detector. The currentflowing through the telephone receiver is smoothed outinto single impulses of a frequency corresponding to the An+enna. Ground The essentials of receiving radio signals, comprising tiie an-tenna, inductance coil for tuning, crystal detector, telepliones,and tlie ground. speed of the vibrator or current supply at the transmit-ting end. Thus the diaphragm of the 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 FO
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
