Patent GB-398263-A (GB)
Title: Improvements in and relating to ultra-short wave systems and electric discharge devices therefor
IPC: H01J25/72
Filed: 1932-03-15
Abstract: 398,263. Thermionic valves; directive wireless signalling. RADIO PATENTS CORPORATION, 10, East 40th Street, New York, U.S.A., and HOLLMANN, H. E., 54, Berliner Strasse, Charlottenburg, Berlin. March 15, 1932, No. 7714. Convention date, March 23, 1931. [Classes 39 (i) and 40 (v).] In a short-wave generator or receiver of the Barkhausen type, the electrodes form a tuned resonant system oscillating in the form of stationary waves, and one or more pairs of parallel conductors are connected to one or more electrodes and serve for supplying the operating voltages, for the reception of oscillations, and for tuning the electrode system. As shown in Fig. 1, a cathode 2 is surrounded by a grid 4 maintained at a high potential, and an anode 3 at zero or a negative potential. The parallel conductors 27 are connected with the nodal point of the grid and the system is tuned by a displaceable bridge 28. The lead to the anode is connected with a point on the axis of symmetry. The grid may consist of a helix, supported on glass rods or freely suspended, or of longitudinal rods supported on a ring at the middle, or also or alternatively by rings at the end. The anode may be of similar construction. In the arrangement shown in Fig. 2, the grid is in two parts 4<1>, 411 connected with the conductors 27. Several such valves may be connected with a common conductor system. In modifications, (a) the grid is undivided and the anode is in two parts connected with the conductors, (b) two pairs of conductors are connected with a divided grid and anode. In the system shown in Fig. 5, the grid is omitted and the discharge is controlled by a magnetic field produced by a winding 33. The conductors 32 are connected with the two parts 3<1>, 3<11> of the anode, or each of the parts 3<1>, 3<11> may be divided to form semi-cylindrical electrodes connected with two pairs of conductors. The Specification as open to inspection under Sect. 91 comprises also several systems in which parallel wires are not employed, and the operating potentials for the anode and grid are applied at their mid-points, so as to form a dipole resonant system. For example, in the arrangement shown in Fig. 4 (Cancelled) the leads 30, 31 are connected respectively to the mid-points of the anode 3 and with a ring 18 supporting longitudinal rods 4 forming the grid. In the valve shown in Fig. 5 (Cancelled) a blocking condenser, consisting of a ring 23 of channel section separated from an inner ring 24 by mica 25, is connected between the grid 4 and anode 3 in order to fix the nodal points and compensate for want of symmetry of voltage distribution. Blocking condensers may also be connected between the ends of the grid and anode. In the arrangement shown in Fig. 12 (Cancelled), the leads are connected with the mid-points of two semicylindrical parts 31, 311 of an anode, and the discharge is controlled by a magnetic field. In the valve shown in Fig. 15 (Cancelled) the cathode is divided into two parts 21, 2<11> to form a dipole connected to leads at the nodal points. This subject-matter does not appear in the Specification as accepted.