"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"

HALF-Duplex. Data flow in either direction, but not in both directions at the same time.

HALF-POWER POINT. A point on a waveform or radar beam that corresponds to half the power of the maximum power point.

HALF-WAVE DIPOLE ANTENNA. An antenna, consisting of two rods (1/4 wavelength each) in a single line, that radiates electromagnetic energy. Antenna Dictionary

HALF-WAVE RECTIFIER. A rectifier using only one-half of each cycle to change ac to pulsating dc.

HALF-WAVE VOLTAGE DOUBLER. Two half-wave voltage rectifiers connected to double the input voltage.

HARD DISK. A flat, circular, rigid plate with a magnetizable surface on one or both sides used to store data. Also called a Hard Disk Drive [HDD]. Note: A hard disk is distinguished from a diskette [floppy Disk] by virtue of the fact that it is rigid. Manufacturers of Hard Disk Drives

HARD-TUBE MODULATOR. A high-vacuum electron tube modulator that uses a driver for pulse forming. See Vacuum Tube.

HARMONIC. A frequency that is a whole-number multiple of a smaller base frequency.

HDLC. High-level Data Link Control is a group of protocols for transmitting [synchronous] data Packets between Point-to-Point nodes. Data is organized into a frame in HDLC. HDLC protocol resides with Layer 2 of the OSI model, the data link layer.

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