"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
Previous listing of "La" Definitions and terms
LOBE: An area of greater signal strength in the transmission pattern of an antenna.
LOBE, ANTENNA: Various parts of the antenna's radiation pattern are referred to as lobes, which may be
sub-classified into major and minor lobes. The major lobe is the lobe of greatest gain and is also referred to as the main
lobe or main beam. The minor lobes are further sub-classified into side and back lobes as indicated in the figure to the right. The numbering of the side lobes are from the main lobe to the back lobe. Dictionary of Antenna Terms
LOCAL OSCILLATOR FREQUENCY: An internally generated frequency in a superheterodyne receiver. This
frequency differs from the receiver operating frequency by an amount equal to the IF of the receiver. The local oscillator frequency may be designed to be either above or below the incoming signal frequency.
LOGARITHMIC RECEIVER: Receiver that uses a linear logarithmic amplifier (lin-log) instead of a
normal linear amplifier.
LOG VIDEO: This receiver process, generally implemented in the IF, compresses the dynamic range of the signal so both weak and strong signals are displayed without changing the gain setting. Output voltage can be calibrated in volts/dB of input power.
LONG PULSE MODE: Many pulsed radars are capable of transmitting either long or short pulses of RF energy. When the long pulses of RF energy are selected manually (or sometimes automatically), the radar is said to be operating in the long pulse mode. In general, "long pulse mode" is used to obtain high average power for long-range search or tracking, and "short pulse mode" gives low average power for short-range, high-definition, tracking or search.
LOOSE DEUCE: General term for two aircraft working in mutual support of each other.
LORO (LOBE-ON-RECEIVE-ONLY): A mode of operation generally consisting of transmitting on one non-scanning antenna system and receiving the reflected energy on another scanning system (The receiver could be TWS, Conical, or monopulse).
LOW-NOISE AMPLIFIER: See Preamplifier.
