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    • 3. 发明专利
    • Improvements in and relating to receivers for wireless telegraphy and telephony
    • GB244568A
    • 1925-12-24
    • GB2724924
    • 1924-11-14
    • CLAUDE SEYMOURGEORGE ALEXANDER IRVINGJAMES CLARENCE WILLIAM DRABBLE
    • H03D11/02
    • 244,568. Seymour, C., Irving, G. A., and Drabble, J. C. W. Nov. 14, 1924. Thermionic amplifiers and detectors.-Relates to valve circuits for the reception of wireless telegraphy and telephony of the kind in which the receiving valve is adjusted to the verge of oscillation, is trigged into oscillation by the received signal, and is periodically quenched at a frequency lower than that of the signal. According to the invention, the qunching oscillations, shown as generated by a back-coupled valve V , are applied through an inductive coupling L , L to the plate circuit of the receiving-valve V . The coil L can be tuned by a parallel condenser C or by a series condenser, for example the condenser K shunting the telephones T. The amplitude of the quenching oscillations applied to the plate circuit may be varied by adjusting the coupling L , L or by regulating the filament current of the valve V . The signal-receiving. circuit, which may be a frame aerial, or a secondary circuit coupled to a receiving-aerial, comprises two coils L', L separated by a block condenser C and tuned by a variable condenser C or by varying the inductances L , L . The circuit is connected between the plate and grid of the valve V , and a grid leak R, and condenser C are connected between grid and filament. The quenching oscillations may be of sub-audible, audible, or higher frequency, but for receiving interrupted continuous wave telegraphy the quenching frequency should be higher than that of the note received. The arrangement is designed to reduce the number of adjustments rquired.
    • 4. 发明专利
    • A method of and means for signalling or modulating by grid potential control in thermionic valve circuits for wireless telegraphy or telephony
    • GB205878A
    • 1923-10-25
    • GB2033722
    • 1922-07-25
    • LIONEL GEORGE PRESTONGEORGE SHEARINGGEORGE ALEXANDER IRVING
    • H04L27/04
    • 205,878. Preston, L. G., Shearing, G., and Irving, G. A. July 25, 1922. Thermionic generators and modulating systems.-In a thermionic generator for transmitting telegraphy or telephony the grid circuit is divided into two portions one of which is arranged to have approximately the same inductance-capacity value as that of the aerial circuit. Signalling is effected by varying the tuning of this portion of the grid circuit. As shown in Fig. 1, the grid circuit is back-coupled to the oscillatory circuit through the coils C, D. The branch FIIG of the grid circuit which has an inductance-capacity value equal to that of the aerial is wholly or partly shorted by a switch P controlled by a signalling- key Q. When the switch P is closed, normal aerial oscillation takes place, but sinks to zero when the switch is opened. Fig. 3 shows an alternative arrangement in which the grid coil D is not coupled to the aerial. The branch circuit contains two coils R, S of equal inductance but wound in opposition. When the switch P is closed the coil S is shorted, the circuit GRF is in tune with the aerial circuit and radiation ceases. Simultaneously, a second switch X throws a negative potential upon the grid to prevent the anode current from rising to an excessive value. Alternative methods may be employed to change the effective inductance-capacity value of the branch grid-circuit, which may also be separate from but closely coupled to the grid circuit proper. As applied to telephony the inductance-capacity value of the branch circuit is varied by means of modulating circuits directly or indirectly associated with the grid circuit.