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LONG-WIRE ANTENNA

An antenna that is a wavelength or more long at its operating frequency [10].

LONGITUDINAL WAVES

Those waves in which the disturbance (back and forth motion) takes place in
the direction of propagation. Sometimes called compression waves [10].


LOOP

A curved conductor that connects the ends of a coaxial cable or other transmission line and projects into a waveguide or resonant cavity for the purpose of injecting or extracting energy [10] [11].


LOOSE COUPLING

Inefficient coupling of energy from one circuit to another that is desirable in some applications. Also called weak coupling [11].


LOW FREQUENCY

The band of frequencies from 30 kHz to 300 kHz [17].

LOW-LEVEL MODULATION

Modulation produced in an earlier stage than the final [12].

LOW-NOISE AMPLIFIER

See PREAMPLIFIER [18].

LOW-PASS FILTER

A filter that passes a majority of the low frequencies on to the next circuit and
rejects, or attenuates, the higher frequencies. Also called a high-frequency discriminator [9] [12].


LOWER SIDEBAND

All difference frequencies below that of the carrier [12].

LOWER-FREQUENCY CUTOFF

The lowest frequency a circuit will pass [9].


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