. Practical wireless telegraphy; a complete text book for students of radio communication . of a frequencyvarying between 300 and .SOO cycles per second flows through its windings. In fact, at fre-quencies in excess of 10,000 cycles per second the movements of the telephone diaphragmare inaudible to the human ear which will not respond to vibrations in excess of 20,000per second. Another factor working in opposition to connecting the telephone in the antennacircuit directly, is the fact that the impedance of the telephone winding will not permithigh frequency currents to pass. Hence we are com
. Practical wireless telegraphy; a complete text book for students of radio communication . of a frequencyvarying between 300 and .SOO cycles per second flows through its windings. In fact, at fre-quencies in excess of 10,000 cycles per second the movements of the telephone diaphragmare inaudible to the human ear which will not respond to vibrations in excess of 20,000per second. Another factor working in opposition to connecting the telephone in the antennacircuit directly, is the fact that the impedance of the telephone winding will not permithigh frequency currents to pass. Hence we are compelled to either convert the currentof radio-frequency into a uni-directional pulsating current or into an alternating currentof a frequency within the range of the human ear. Currents of radio-frequency induced in receiver aerials may be made audible by meansof a simple rectiHer—z. device which will permit the preponderance of current to flowthrough a given circuit in one direction only. If a rectifier is placed in series with a circuit 132 PRACTICAL WIRELESS TELEGRAPHY. 05CILLATI0MS.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
