User's Manual

III-3
Block Diagram
The RF signal enters through the RF Input connector on the power amplifier enclosure from the
modulator or processor. It then passes through an RF attenuator to limit the output power level of
the power amplifier and to help buffer any transients that may come into the power amplifier. After
attenuation, the signal is amplified through the PA25-VHF driver and through the P200 final
amplifier. The signal then passes through a bandpass filter. Finally, the amplified signal passes
through a dual directional coupler for monitoring purposes. After the directional coupler, the signal
exits the power amplifier enclosure before heading out to an antenna for broadcast.