. 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 . The spiral or flat type of loop,which may be readily made andwhich affords no end of interest-ing possibilities. do not begin to prove as effective as outdoor antennae,hence amplifiers must be resorted to when using the number of turns comprising any loop dependslargely on 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 . The spiral or flat type of loop,which may be readily made andwhich affords no end of interest-ing possibilities. do not begin to prove as effective as outdoor antennae,hence amplifiers must be resorted to when using the number of turns comprising any loop dependslargely on the wave length desired and the dimensionsof the frame, it is best to decide the exact number in eachcase by experimentation. To this end the loop shouldbe made with bare wire so that one can tap any number of RADIO FOR EVERYBODY 109 turns, or the insulated wire should be bared at certainpoints so as to permit of tapping. More will be saidabout loops in the chapter on operating the One of the neatest forms of loop. The turns of wire are spacedabout one inch apart for the best results. The Irreducible Minimum Among Receivers With the antenna and ground accounted for, the nextstep is to consider receiving equipment. The simplestreceiving equipment comprises a detector and a singletelephone receiver. The detector, as we have already-learned, is a device which changes the frequency of theincoming waves from radio frequency to audio frequency no RADIO FOR EVERYBODY so that they may be heard in the telephone receiver. Letus consider the simplest kind of detector. Nothing could be less complicated or less expensivethan the crystal detector. It makes use of one of severaldifferent kinds of mineral crystals v^hich possess the de-sirable characteristics. The most popular crystal bodytoday is galena (lead peroxide), a silvery gray mineralwhich breaks in squares with mirror-like surfaces. Rest-ing on the galena crystal is a fine piece of wire, and it is GALENA DETECTOR WfTH
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