i'm building fm radio jammer for project for my ee class in physics department. a circuit is here. http://www.circuitstoday.com/fm-radio-jammer i bought the components, soldered on PCB. it hasn't worked. an oscilloscope shows sine oscillation even if there is no L and C for tank circuit. i.e. connects wire of both ends which supposed to be connected with L and C. also it shows different frequency than expected by calculating resonance frequency formula i.e. reciprocal of (2 pi root LC) to the point that it seems what L and C are connected doesn't matter. i suspect there are some kind of innternal inductance and capacitane. i'm wondering why mine doesn't work. I saw that other person made the same circuit and that one worked fine. i did everything same except i think using different kind of variable capacitor. i used one in second picture because i can't find first one in my local electronics components store. difference is that they have different q factor. is it impossible to make lc oscillator making signal in frequency 100Mhz without high q factor capacitor or there can be other thing i am doing wrong? also i am almost ignorant of how this ciurcuit works. what books do you reccommend to study about this circuit?