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File:Spark-gap transmitter current waveforms - quenched gap.png

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Summary

Description
English: Graph of the current in the primary (I1) and secondary (I2) circuit of a quenched-spark inductively coupled spark-gap transmitter, an obsolete type of radio transmitter. This image is meant to contrast with Spark-gap transmitter current waveforms.png, showing how the quenched spark gap prevents loss of energy in the ordinary inductively coupled circuit.

The circuit consists of an air core resonant transformer whose primary is connected to a capacitor through a spark gap, forming a tuned circuit and whose secondary is connected to an antenna and ground. The secondary also forms a tuned circuit with the capacitance of the antenna. When the capacitor is discharged through the spark gap, the energy creates oscillating radio frequency current in the primary winding. The energy is transferred to the secondary winding, and the oscillating current in the primary circuit decreases to zero while the current in the secondary increases to a maximum. At this point (Q) the quenched spark gap extinguishes ("quenches") the spark. This allows the oscillating energy to stay in the secondary antenna circuit, creating long ringing waves which have lower damping.
Date
Source Retrieved 17 August 2018 from Bernard John Leggett (1921) Wireless Telegraphy: With Special Reference to the Quenched-spark System, E. P. Dutton and Co., New York, p. 57, fig. 14 on Google Books. Alterations to image: added labels in red.
Author Bernard John Leggett

Licensing

Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Spark-gap_transmitter_current_waveforms_-_quenched_gap.png

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Graph of currents in a quenched spark radio transmitter

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current19:25, 17 August 2018Thumbnail for version as of 19:25, 17 August 2018863 × 565 (35 KB)ChetvornoUser created page with UploadWizard

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