. 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 . ed, in order to obtain the necessary high standard General Electric Company two-kilowatt highfrequency alternator designed for a frequency of 200,000cycles or 1,500 meters wave length must be revolved at aspeed of 20,000 revolutions per minute. This is a veryhigh rate of spe
. 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 . ed, in order to obtain the necessary high standard General Electric Company two-kilowatt highfrequency alternator designed for a frequency of 200,000cycles or 1,500 meters wave length must be revolved at aspeed of 20,000 revolutions per minute. This is a veryhigh rate of speed. Imagine a speed seven or more timesas fast as the turning of the average electric fan! Again,needless to say, this is not a good method for the averageamateur. Skipping over several other highly technical methods,we come to the vacuum tube oscillator method, which isbrought about by using what is known as the Armstrongfeed back or regenerative system, which has alreadymade our acquaintance in the previous chapters dealingwith receiving systems and methods. This kind of €Wtransmission is brought about by placing an inductancein series with the plate, and this, in turn, is placed ininductive relation with the grid, causing the plate currentto act on the grid and producing oscillations of a frequency. ^38 RADIO FOR EVERYBODY dependent entirely on the constants or electrical values ofthe circuit. Perhaps the accompanying diagram makesthe foregoing description clearer. It will be noted that thearrangement here shown is very mUch like the usual regen-erative receiving hook-up, except that the telephone re-ceivers have been left out, and a telegraph key is placedin the primary circuit of the oscillation transformer or -S-B
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