BJTs works as an amplifier in the amplifier part of the FM transmitter. I'm wondering what's the function of the BJT in Colpitts oscillator part? All i know is Colpitts oscillator consists of the the 2 cap parallel with the inductor. I'm guessing its a buffer and a further amplification of the output,am i right? why the C5 is placed before the antenna? is it to dc coupled? i'm saying this because the spectrum analyzer must measure the frequency spectrum only at positions after the C5.. And i don't understand why C8 is placed the in the center of the 2 capacitors and to the emitter part? Can i juz put C8 from collector to emitter? anyway,really apprecitate a lot if you can help.