With a traditional AM non-linear high-powered transmitter, the signal is first split into its amplitude (A) and phase (RFP) components for injection into the transmitter modulator audio input and frequency drive circuits respectively. The relative timing of the A and RFP signals is adjusted to ensure synchronism at the modulator, and they are effectively recombined (by the action of the transmitter itself) through this hybrid modulation scheme. This A/RFP splitting technique is not required in the case of a transmitter using linear amplification. In this case the composite OFDM signal is applied to the transmitter input in place of the usual analogue AM signal input. 

схема (цепь) возбуждения частоты и аудио входа??
Заранее спасибо