GB415804A - Improvements in or relating to thermionic oscillation generators - Google Patents

Abstract

415,804. Valve generating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London, and WASSELL, H. J. H., 120, Mildmay Road, Chelmsford. March 6, 1933, No. 6709. [Class 40 (v).] A generator comprises an oscillation valve V1 whose output includes a parallel tuned circuit Z 1 from a tapping on which energy is fed over a piezoelectric crystal Cr to a reaction valve V2 whose anode circuit is connected to the grid of valve VI. Preferably a condenser C1 is in series with the crystal Cr, and a condenser C2 connects the anode of valve V2 to the grid of valve VI. The output circuit of valve V2 comprises a tuned circuit Z2 while the oscillations are taken off from a resistance Z3. The high tension source is connected to a tapping on the circuit Z 1 and grid bias is supplied over leads 1, 2. Automatic grid bias may alternatively be utilized, Fig. 2 (not shown). The circuits Z1, Z2 may be tuned to the crystal frequency, or a harmonic of the crystal frequency may be produced by suitably adjusting the circuits Z1, Z2, and setting the reaction valve V2 to work on a suitable point of its characteristic. Specification 397,007 is referred to.