The A B C of vacuum tubes in radio reception; an elementary and practical book on the theory and operation of vacuum tubes as detectors and amplifiers. Explains non-mathematically by Lewis Elmer Hugh 1889-

Author:Lewis, Elmer Hugh, 1889-
Language: eng
Format: epub
Tags: Vacuum-tubes, Radio, Radio
Publisher: New York, Norman W. Henley Pub. Co.
Published: 1922-03-25T05:00:00+00:00

VACUUM TUBE DETECTOR

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The most marked disadvantage is probably the critical adjustment of filament temperature and plate potential necessary to satisfactory operation. Another is the shortened life of the tube caused by the bombardment by the comparatively heavy ions which are driven against it when they are repelled by the plate.

Heterodyne Action, or the Production of Beats

It has been pointed out that unmodulated (unmodified) undamped radio frequency oscillations will not produce sound in

/OOO-Becrf-3 by Addition!

l.000~ Telephone Currenf-' 1 Fig. 27—The principle of heterodyne action.

a telephone receiver. If, however, oscillations of a different frequency are generated locally and forced to flow in an antenna circuit there is an interaction between the two frequencies which produces oscillations of a third frequency equal to the numeri-

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