X - X-ray - dah-di-di-dah
X-Beam Antenna.
A high performance broad-band antenna that is ideal for radio operators with limited space. The X-beam is a compact version of the 2 element Yagi; its performance equals or exceeds that of its conventional counterpart. Its name is derived from its shape.
XCVR.
Shorthand for transceiver, a radio that both receives and transmits.
XTAL.
Shorthand for Crystal.
XYL.
Abbreviation of eX Young Lady i.e. 'The Wife'.