. 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 . heostathandles, 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 o
. 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 . heostathandles, 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 amplification in order tobuild up the signal strength. In extreme long-distance work, it is not uncommon to. ^0-60 VOLTS b I6 VOLTS a Resistance type of radio-frequency amplifier. Tlie set ofwires b are for tlie plate battery current, with the polarityindicated, while the a set indicates the filament battery wire marked 1 is the grid wire from the tuner. R arethe filament rheostats; Rl, 2 are resistances; Am are ampli-fier tubes; D is the detector tube; FC—fixed condenser; T—telephones; VC—variable condenser. find two stages of radio-frequency amplification, followedby a detector and two stages of audio-frequency amplifi-cation. When using a loop antenna, it is usually necessary toemploy radio-frequency amplification unless one is nearthe desired transmitter. The rad
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
