. 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 . Ti e A two-slide tuningcoil arranged fortuning the antenna-ground circuit andtlie closed detectorcircuit. 114 RADIO FOR EVERYBODY in which the variometer is placed. When the dial is setat 0, the two sets of coils are so arranged that the currentwill he flowing in opposite directions in
. 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 . Ti e A two-slide tuningcoil arranged fortuning the antenna-ground circuit andtlie closed detectorcircuit. 114 RADIO FOR EVERYBODY in which the variometer is placed. When the dial is setat 0, the two sets of coils are so arranged that the currentwill he flowing in opposite directions in both sets of coils,and the coils are then said to be in opposition or buckingeach other. In that condition the inductance is greatlyreduced, and the wave length is therefore at a a considerable range of wave-length values maybe obtained with very fine adjustment by the turning ofthe variometer knob. There are no loose contacts to bother FIXED COiL OR WINDING. HANDLE ANDDIAL MOVABLE CO!L OR WINDING The mechanism of the variometer. This instrument consists oftwo sets of coils, one fixed set and one movable set. with, and the rotary action is far more convenient thanthe movement of sliders along a tuning coil. In the inexpensive receiving sets now being offered tothe public, the tuning is effected by several methods. Thelowest priced sets use merely an inductance with taps takenoff at regular intervals and connected to the points of a RADIO FOR EVERYBODY 115 switch. This rough tuner is placed across the detector andtelephone. Since the telephone offers too much resistance10 the passage of high-frequency current to the detector,a small fixed condenser is placed across the a set, it must be evident, is satisfactory for shortdistances only, and cannot tune with any degree of ac-curacy so as to throw out undesirable stations and con-centrate on any given sets selHng for $ or$ are of a better grade,being provid
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
