Abstract :
Part I is devoted to an examination of the ordinary method of recorder working in wireless telegraph receivers, as affected by the damping of the receiver circuits. After a résumé of the significances of the decrement of any oscillatory system, its bearing on the possible speed of recording Morse signals is investigated. The quality (approach to correct Morse ¿shaping¿) is estimated from calculated curves of amplitude of oscillation set up in the receiver by the incoming dots and dashes constituting the letter ¿1.¿ By comparing several such curves, a minimum practical value is found for the product of frequency and decrement and duration of Morse dot. The relation between speed of signalling and the requisite transmitter power is then investigated. Part I concludes (Section 5) with a summary and discussion of the results arrived at. In Part II an improved method of reception, called ¿receiver curbing,¿ is described and analysed. An estimate is made of the improvement obtainable, and practical circuits are given for putting the method into effect.
