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K
The Morse code abbreviation for "any station respond." Kilo - The metric prefix for 103, or times 1000

Lightning protection
There are several ways to help prevent lightning damage to your equipment (and your house), among them unplugging equipment, disconnecting antenna feed lines and using a lightning arrestor. Compliance with National Fire Protection Association NFPA 780 Standard for the Installation of Lightning Protection, is recommended to protect your house.

Limiter
A stage of an FM receiver that makes the receiver less sensitive to amplitude variations and pulse noise.

Line-of-sight propagation
The term used to describe VHF and UHF propagation in a straight line directly from one station to another.

Low-pass filter
A filter that allows signals below the cutoff frequency to pass through and attenuates signals above the cutoff frequency.

Lower sideband (LSB)
The common single-sideband operating mode on the 40, 80 and 160-meter amateur bands.