. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 162—Fundamental Circuit of Marconi Valve Tuner. The Flerning valve gives signals of greatest strength when the secondarycircuit is designed for a minimum value of shunt capacity and a maximum valueof inductance for a given wave length or frequency, hence the secondary con-denser is always worked at low values of capacity. Many valves are more sensitive if an added potential is applied between the filament RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 143 and the plate. Like the carborundum detec
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 162—Fundamental Circuit of Marconi Valve Tuner. The Flerning valve gives signals of greatest strength when the secondarycircuit is designed for a minimum value of shunt capacity and a maximum valueof inductance for a given wave length or frequency, hence the secondary con-denser is always worked at low values of capacity. Many valves are more sensitive if an added potential is applied between the filament RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 143 and the plate. Like the carborundum detector, the Fleming valve has a rising char-acteristic and when an E. M. F. is applied to the space between the plate and the fila-ment the current may be adjusted to the critical point on the characteristic curve so thatthe addition of a slight antenna voltage causes a large increase of the local battery currentflowing through the head telephones. A satisfactory diagram appears in Fig. 162 wherein a potentiometer P-1 isshunted across the filament battery and a portion of the current flo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
