The C.w. Manual: Design and Construction of Radio Telegraph and Telephone Transmitting Equipment (Google eBook)

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Pacific Radio Publishing Company, 1922 - Radio - 105 pages
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Page 4 - ... oppose the voltage of the plate battery and hence to reduce the voltage acting between filament and plate in the tube. During the other part of the cycle, when the grid is negative with respect to the filament, the voltage acting between plate and filament is increased above that of the steady voltage of the plate battery. During the portion of the cycle when the grid is positive with .respect to the filament current flows within the tube between the grid and filament, and this current increases...
Page 2 - Direct-coupled generating circuit so-called Hartley circuit which is typical of the circuits used for the purpose of generating oscillations. The grid and filament of the tube in this particular circuit are connected to the branched circuit containing inductance and capacity, constituting the oscillatory circuit, in such a manner as to include a portion of the inductance of that circuit, that is the coil Lt.
Page 3 - ... conductivity between filament and plate and filament and grid. The circuit Lg Lp C is resonant to the fundamental constituents of these pulsating currents, and an oscillatory current is generated which circulates around this branched circuit, flowing in series through the condenser C and the coils Lp and Lg. This current, which will be called the output current, can be many times greater in amplitude than either of the pulsating currents. The pulsations in the steady current, which flows during...
Page 5 - L9; this means that power is being supplied to the output circuit from the plate circuit of the tube. As will appear later, the impedance of the output circuit to all frequencies that are harmonic multiples of the fundamental is very great, hence there are no appreciable multiple frequency constituents of current circulating in the output circuit, and the alternating voltages across the coils Lp and Lg are in all cases practically sinusoidal. Consequently the useful power supplied by the tube can...
Page 3 - ... circuit. This latter current is appreciable only when the grid is positive with respect to the filament. Except for effects which are extraneous to this treatment, this current is also unidirectional. When the tube is in the oscillating condition these currents will not be steady, but will become pulsating. The pulsating currents generated by the tube enter the circuit from the filament and leave it through the plate and grid connections ; they are pulsating, and not alternating, on account of...
Page 87 - The course will be divided into three parts, the first of which will be 2Vi days of general computer programming school offered by Stanford Computer Center.
Page 94 - Ohms per 1000 Feet. Ohms per Mile. Feet per Ohm. Ohms per Pound.
Page 4 - ... to the filament current flows within the tube between the grid and filament, and this current increases as the grid becomes more positive. The direction of the current flow is in the direction of the emf , that is, from grid to filament inside the tube and from filament to grid outside of the tube. Further, as the grid becomes positive with respect to the filament, there is a resultant increase in the current flow between the plate and filament of the tube, even though the plate voltage on the...
Page 4 - ... of the cycle that is, when the grid is negative by rectification effects; moreover, the grid current is always pulsating, and is zero for a considerable part of a cycle, while the grid is negative. Consequently the waves of current supplied to the circuit between F and P and F and G (Fig. 2) are each composed of a direct or average constituent, a fundamental constituent corresponding in frequency to that of the output current, and a number of higher frequency or harmonic constituents.
Page 4 - ... grid is positive with respect to the filament as a result of the voltage induced in the coil Lg, the voltage drop between the plate and filament connections (across the coil Lp) is such as to oppose the voltage of the plate battery and hence to reduce the voltage acting between filament and plate in the tube. During the other part of the cycle, when the grid is negative with respect to the filament, the voltage acting between plate and filament is increased above that of the steady voltage of...

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