This FM RF power amplifier has 2 transistors from Philips: BLV10 and BLW87. The 2 rf transistors work in class C and this fm amplifier has a total gain of 21dB (100x) and 55 – 65% efficiency. One low pass filter with 9 components ensures 60dB rejection of the the second harmonic. There is no need for tune-up to cover the whole 88-108 MHz FM band.
20W RF FM amplifier circuit diagram
Source:- http://www.electroschematics.com/18/rf-fm-88-108-mhz-20w-amplifier-blv10-blv87/
