The a B C of Vacuum Tubes in Radio Reception An Elementary And Practical book O
The a B C of Vacuum Tubes in Radio Reception An Elementary And Practical book O
Elmer Hugh Lewis
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Detection with Grid Condenser In the case of simple detection, there may be actual or appar- ent rectification of grid current, depending upon the normal grid potential. If a small condenser is connected into the grid circuit close to the grid, however, the rectification of grid cur- rent is actual. There is also apparent rectification of the plate current variations. The mode of functioning is some- what different, however, when a grid condenser is used. Assume that, due to resonance with a tr...ansmitting antenna, there are damped radio frequency oscillations of maximum possible amplitudes induced in the receiving antenna. Radio VACUUM TUBE DETECTOR * Operating /Audio Frequency Plate Current Variations Radio Frequency Grid Potent/a/ Variations-* ^Normal Grid-Potential ^ Radio Frequency Plate Current Variations Frequency Grid Potential Variations Fig. 25 Detection of voice modulated continuous oscillations at a varying group frequency. 68 ABC OF VACUUM TUBES frequency alternating potentials are applied to the grid through the grid condenser.
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