. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 193—The Tuning Variometer Complete. *See paragraph 30; also fig. section H appendix. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 167. pie tuning coil of the same value of inductance, would obviously possess lessresistance. 149. Buzzer Excitation Systems.—If any part of an active vibrating buzzer(energized by a battery) is placed in inductive relation to either the open or closedcircuits of a receiving set, the fluctuations of the battery current act inductivelyon the receiving circuits
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 193—The Tuning Variometer Complete. *See paragraph 30; also fig. section H appendix. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 167. pie tuning coil of the same value of inductance, would obviously possess lessresistance. 149. Buzzer Excitation Systems.—If any part of an active vibrating buzzer(energized by a battery) is placed in inductive relation to either the open or closedcircuits of a receiving set, the fluctuations of the battery current act inductivelyon the receiving circuits and set up therein feeble currents which are rectified andmade audible in the head telephone. Maximum response in the head telephone is obtained when the crystal rectifieris adjusted for the best degree of rectification, hence the buzzer affords a ready means for readjustment of a, receiv-ing detector of any type. A perfectreproduction of the tone of the buzzeris obtained in the head telephones, thepitch varying in accordance with theinterruptions of the vibrator. In one method a wire is extendedfrom some part of the buzzer circuit,preferably the contact points, and is con-nected directly to either the earth lead ofthe receiving-tun
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
