. 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 . ^ft 188 RADIO FOR EVERYBODY with other types of ampHfying circuits; it is vastlysuperior to any other method of amphfying telephonespeech; it eliminates tube noises; it increases selectivity; itincreases signal audibility at each stage at least twentytimes; it makes possible the use of
. 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 . ^ft 188 RADIO FOR EVERYBODY with other types of ampHfying circuits; it is vastlysuperior to any other method of amphfying telephonespeech; it eliminates tube noises; it increases selectivity; itincreases signal audibility at each stage at least twentytimes; it makes possible the use of small loops or frameantenna to receive as well as with high antennae; and itgives a 20-watt amateur radio telephone set the trans-mitting range of a transmitter of several times the note that radio-frequency amplification can beused in Connection with any existing receiving set, evenif said set is of the simplest and most elementary Another radio-frequency arrangement. VCl—variable con-denser in aerial-ground circuit; LiC—loose-coupler or vario-coupler; VC2—variable condenser across secondary; Am—amplifier tube; Kl, 2, 3, 4—rheostats; PS—primary and sec-ondary of intervalve or amplifying transformer T; GL,—gridleak; D—detector; B—plate battery; A 1 and 2—filament bat-tery; rc—fixed condenser; T—telephones; TICK—ticklercoil; G—ground. For radio-frequency amplification builds up the wavestrength before it is passed on to the detector, so thatin every sense of the word it is as though the receivingset were moved a considerable distance towards the trans-mitter. Thus a crystal detector can be used in conjunctionwith the radio-frequency amplifier, for after the wavestrength has been built up by the radio-frequency ampli-fier, it is rectified by the crystal detector. Then, if de-sired, the rectified current from the crystal detector canbe amplified by means of audio-frequency amplifiers. RAD
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
