. 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 . ORiD !_EAKAND CONDENSE^ HOLES foR i^^°^ FREQUENCYJ CONNECTIONS Components of a combination radio frequency amplifier, vacuum tube detector, and audio frequency amplifier, mounted in a neat steel cabinet. 184 RADIO FOR EVERYBODY fier the waves are amplified before they are passed tothe d
. 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 . ORiD !_EAKAND CONDENSE^ HOLES foR i^^°^ FREQUENCYJ CONNECTIONS Components of a combination radio frequency amplifier, vacuum tube detector, and audio frequency amplifier, mounted in a neat steel cabinet. 184 RADIO FOR EVERYBODY fier the waves are amplified before they are passed tothe detector. The advantage of the radio-frequency ampHfier lies inthe fact that it amplifies only the wave and not themany little irregularities and imperfections which exist usual receiver and amplifier equipments. Further-more, most detectors have a critical point at which they FILAMENT RHEOSTATS WiNOOW \FOR AMPLIFIER ^^-^^-^ FOR DETECTOR ORAMPLiFiER Two-stage audio frequency amplifier, with filament rheostathandles, switch handle for connecting: the detector alone, orone stage or two stages of amplification into the circuit, aswell as the input, output, and filament current binding postsmounted on the front paneL begin operating. Signals which come in weaker than thecritical point of the detector make no impression on thedetector, and are therefore lost entirely. No matter howmany steps of audio-frequency amplification may be piledup behind the detector, the signal which has failed to- RADIO FOR EVERYBODY 185 actuate the detector will certainly not be heard. Withradio-frequency amplification, on the other hand, there isvirtually no critical point, and even the weakest signal isbuilt up to the desired degree before it is passed on tothe detector, there to be rectified to audio-frequency cur-rent, which, if desired, can be passed on through one ormore stages of audio-frequency amplificat
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
