and simpler high-level modulation system. The purpose of this lesson, then,
is to describe the operation of a high-level modulation system.
You will
learn how the components in the high-level modulator work together to
develop the high-voltage rectangular DC pulse. Finally, you will learn how
to maintain and troubleshoot practical high-level modulators.
Figure 53. How High-Level Modulation Works.
c. Look at Figure 53 again. Actually there are two circuits involved
in the operation of the modulator: a charge circuit and a discharge circuit.
The charge circuit consists of the high-voltage power supply, the charging
impedance, the PFN, and the load.
The discharge circuit consists of the
switch, the load, and the PFN.
d. Now that you have a general idea of how the basic high-level
modulator works, the next step is to learn what each component does in the
system. Let's start with the pulse-forming network.
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