This is a YIG oscillator for 3.8 to 6.8 GHz. Yttrium iron garnet, or YIG for short, is a masterpiece of solid-state physics: a ferrimagnetic single crystal whose extraordinary properties make it ideal for highly precise microwave applications. In a YIG sphere, the precession of the electron spins can be controlled extremely precisely with an external magnetic field. This allows, together with a bit of high-frequency magic, the creation of extremely stable, low-noise oscillations. When opened, the small YIG sphere, the coupling coil, and the large coil generating the magnetic field are clearly visible. Pretty cool, right?
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