Improvements in or relating to keying systems for radio and like valve transmitters

摘要

314,535. Telefunken Ges. f³r Drahtlose Telegraphie. June 30, 1928, [Convention date]. Keying systems.-In a valve transmitter, in which keying is effected through the medium of a valve or valves M in the grid directcurrent circuit of the main valve H, the key T is connected between the anode and grid, and a biasing battery B, in series with a resistance RG, is connected between the grid and filament of the keying-valve. The invention may be applied to an oscillating modulation valve (Fig. 2, not shown).