Radar Jargon and Definitions
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X-Band. A range of frequencies between 8GHz and 12GHz.
.X-Band Usage in the US
Table of Radar Bands [leaves the Radar Dictionary]
Also, definitions of Antenna Terms [in its own section].
XCO: Abbreviation for a Crystal controlled oscillator. An oscillator which uses a crystal to control the oscillation frequency.
XO: Abbreviation for crystal oscillator. [Crystal Oscillator Manufacturers]
X-RAY EMISSION: Penetrating radiation similar to light, but with shorter wavelength, that can
penetrate human tissue.
X-Y Mount: A style of antenna mounting that uses the X-axis as the primary mount and the Y-axis as the secondary mount.
The alphabetic links above navigate the dictionary of Radar terms, while the link to Antenna Terms jumps to the dictionary of Antenna Definitions [which is a completely different dictionary].