. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CONSTANT FREQUENCY OSCILLATORS 91 to be located in the grid leads instead of in the plate leads, a condenser must be used. This may replace the conventional stopping condenser. Where the reactance is in the plate lead for a similar type of oscillator, the stopping condenser in the grid lead should be large so as to have negligible impedance. Similar expedients are suggested for the im- pedances of the other types of oscillator circuits. As typical of the general method
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CONSTANT FREQUENCY OSCILLATORS 91 to be located in the grid leads instead of in the plate leads, a condenser must be used. This may replace the conventional stopping condenser. Where the reactance is in the plate lead for a similar type of oscillator, the stopping condenser in the grid lead should be large so as to have negligible impedance. Similar expedients are suggested for the im- pedances of the other types of oscillator circuits. As typical of the general method whereby any of the simplified cir- cuits of Figs. 1 to 18 may be elaborated into a conventional circuit of this kind, including the various adjunctive circuits, Fig. 19 should be STOPPING CONDENSER. Fig. 19—Practical arrangement of oscillator with three series tuned coupled circuits. referred to. This figure illustrates a complete wiring diagram of the oscillator of Fig. 7 and shows an example of stabilization by means of the inductance L5 in the plate circuit and the inductance L4 in the grid circuit. In addition to satisfying the relation shown in Fig. 7, it may be noticed that the value of L5 is such as to tune with Ci to the oscilla- tion frequency, and, similarly, the value of L4 is such as to tune with C2 to the oscillation frequency. Under such conditions a resistance of appreciable value may be introduced into the circuit of L3 without affecting the frequency of the stabilization. The reason for this may be explained briefly as follows: Consider a single series circuit formed of one of the three meshes of Fig. 19, for instance that composed of the elements, Tg, in parallel with the 8000-ohm leak, La, and Co. This circuit is in series resonance at the frequency at which the circuit as a whole oscillates. Therefore it tends to introduce resistance impedance only into w^hatever circuits it is reactively coupled with. Thus, the effect of this circuit upon the adjacent ci
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