The input signal is sampled by a conventional audio analog-to-digital converter (ADC), and fed to a digital exciter, which modulates overall transmitter output power by switching a series of low-power solid-state RF amplifiers on and off.
An analog audio signal is first converted into a digital format using an ADC, then fed to a digital exciter that modifies the overall transmitter output power by turning on and off a series of low-power solid-state RF amplifiers.