Modulation of R.F. Amplifiers

Author: J.B. Hoag

The Principle of Amplitude Modulation was discussed in Chapter 16 and should now be reviewed. The following chapter contains a description of the commonly used circuits and some of their details.

In the plate-, and the plate-and-screen modulation systems, the audio power, which is found later in the sidebands, is entirely supplied by the modulators. On the other hand, in the grid-modulation system, the audio unit, in considerable part, acts by varying the efficiency of the modulated r.f. amplifier unit.