GB498413A - Frequency-reducing valve circuits - Google Patents

Abstract

498,413. Valve generating circuits. RADIOAKT.-GES. D. S. LOEWE. July 8, 1937, No. 19025. Convention date, July 8, 1936. [Class 40 (v)] Frequency reduction is effected by a chain of multi-grid valves with adjustable coupling between them, the valves oscillating without interaction when the coupling is at the zero point. Each valve of the chain of frequencyreducers has its anode coil 12b coupled to a tuned grid circuit 3, 12a, the natural frequency of which is adjusted by a resistance 16. The cathode leads include bias resistances 4 shunted by condensers 5, and the screen grids 8 are biassed by potentiometers 19, 20 and are shunted to earth by condensers 21. Each stage applies synchronizing impulses to the succeeding stage by means of a slider on a resistance 14<1> in the anode circuit of one valve 2 connected to the suppressor grid 9 of the next valve 1. The connection includes a block condenser 15<1> and a series resistance 10 to reduce grid current, and the mean voltage on the grid 9 is held to that of the cathode by a high resistance 11. In a modification, Fig. 2 (not shown), the synchronizing impulses are applied from a slider on a resistance connected between the coil 12b<1> and the cathode of the valve 1. A condenser is connected between the coil 12b<1> and the anode so that anode direct current of the first valve. 1 is diverted from the coil and is fed through a resistance in the manner shown in Fig. 1 for the second valve. Specification 475,595 is referred to.