Abstract :
The paper describes the development of some of the valve transmitters employing rectified power for naval purposes, from December 1918, onwards. The earlier work is briefly reviewed and general considerations of design for ship conditions are dealt with. A description is given of the method of calculation of the geometry of the rectifying valve electrodes and of the power loss. Some of the types of transmitter circuits employed are described, also detail circuit improvements for satisfactory working. Arrangements of valves in series and the use of coupled circuits for drying-out wet aerial systems, also separate grid-excitation circuit arrangements, are dealt with. Experimental circuits for the reduction of harmonic interference, also the arrangements adopted for signalling by grid potential control, are discussed. Finally, the design of the transmitting valve electrodes is dealt with and the question of valve rating is discussed.
