. 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 . one receiver. Onemethod is to use a small pulley mounted on an electricmotor, and to have a wire resting in the groove of thepulley. When undamped waves or CW signals, as theyare called, come through such an arrangement, they arereceived in the form of short or long scratchy sounds,beca
. 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 . one receiver. Onemethod is to use a small pulley mounted on an electricmotor, and to have a wire resting in the groove of thepulley. When undamped waves or CW signals, as theyare called, come through such an arrangement, they arereceived in the form of short or long scratchy sounds,because of the tikkers interruptions. However, a tikkeris in reality an imperfect contact and as such it takes awayfrom the strength of the incoming undamped or CW RADIO FOR EVERYBODY 141 signals. Therefore the regenerative arrangement is tobe preferred. Two other methods in general use for regenerativereception are shown in the accompanying diagrams. Itwill be noted that instead of a tickler coil, use is madeof a variometer in the plate circuit. This variometerserves to tune and feed back into the grid the addedvoltage of the plate circuit. All regenerative sets are delicate to operate, for theregenerative effect gives rise to all kinds of noises in thetelephone receivers ranging from a hissing steam sound. itIIi (3 still another method of regenerative operation: A—antenna;P—primary; S—secondary, of vario-coupler C; VCl—variablecondenser in antenna-ground circuit; VC2—variable con-denser; VC3—variable condenser used as grid condenser;GLr—grid leak; A—filament battery; VT—vacuum tubedetector; V—plate variometer; FC—fixed condenser; T—tePephones; B—high voltage or plate battery; R—platebattery rheostat; G—ground. Note the extra inductancecoil of few turns, developed by experiment. to the babel of sounds that might be expected in a monkeyhouse riot. The operation of such a set is considerablymore involved than the plain receiving equipment, but onthe oth
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
