This FM power amplifier is build using a bipolar transistor MRF317. Similar to a lots of FM amplifier application, the power transistor is in a C class bias.
All the impedance networks (Input & Output) have been determined by using the Mimp software. A 9 elements low pass filter ensures that we meet at least a 60 dB rejection from the carrier (RF Simulation with RFSIM99). The FM RF amplifier has a 10 dB gain with a 60 to 65% efficiency. The Input VSWR is around 1.4 and there's no problem to reach the maximum power in all the FM band.
100W FM Amplifier Circuit source: radioinitiation.chez-alice.fr
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