This oscillator has an eleven.6MHz crystal and it is tuned for the 3rd overtone or harmonic of 34.8MHz. The sine wave below is fairly good, and there is almost almost nothing of the 11.6MHz fundamental in the 34MHz output in the Fourier Display screen. In an RF crystal oscillator framework, https://kameronrgvix.ja-blog.com/30899964/the-basic-principles-of-precision-crystal-oscillators