. 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 . manner which permits theuse of the full voltage on the amplifier tubes, while avariable portion of the same battery is used for the de- VARIABLECONDENSER Rear view of a simple receiving set vphich makes use of a simpleinductance and a variable condenser, as well as a crystal detector. 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 . manner which permits theuse of the full voltage on the amplifier tubes, while avariable portion of the same battery is used for the de- VARIABLECONDENSER Rear view of a simple receiving set vphich makes use of a simpleinductance and a variable condenser, as well as a crystal detector. tector tube. Where extremely loud signals are desiredplate voltages of 100 or over may be used without damag-ing the amplifier tubes, but the use of this voltage increasestube noises and is therefore not desirable when receivingsignals with the telephone head set. However, this infor-mation is only included here as part of the receiver prob-lem, and more will be said about amplifying tubes in thenext chapter devoted exclusively to amplifiers. 128 RADIO FOR EVERYBODY A detector tube which does not prove to be critical asto plate voltage and filament current is usually good detector tube will give greatly increased signalstrength with a certain plate potential and filament bril- RYSTAL DETECTOR. VARIABLECONDENSER NDUCTANCECONTROL TtLEPHONE JACK Front view of receiving set shown on page 127. The cabinet ofthis set is made of metal instead of the usual wood. liancy. An amplifier tube which requires a critical platevoltage or filament current adjustment will not give satis-factory results as an amplifier. Tubes of this characterwill generally be found useful as detectors. In certainreceiving sets which include an amplifier, it is sometimes RADIO FOR EVERYBODY 129 found that amplifier tubes are recommended for usethroughout, for the reason that the wiring provides for acommon plate voltage and filament current practice may simplify the construction and oper
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