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"H",
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Previous set of "H" terms and definitions.
H-FIELD. Any space or region in which a magnetic force is exerted. The magnetic field may be produced
by a current-carrying coil or conductor, by a permanent magnet, or by the earth itself.
HIC. Heterogeneous Interconnect bus provides a bidirectional serial interconnect which builds a scalable parallel system using pairs of unidirectional lines. IEEE-1355 defines the physical and Logic Link layers between a Chip-to-Chip, Board-to-Board, or Chassis-to-Chassis interface. The HIC interface is obsolete.
HIGH FREQUENCY. The band of frequencies from 3 megahertz to 30 megahertz.
HIGH-FREQUENCY COMPENSATION. See PEAKING COIL.
HIGH-LEVEL MODULATION. Modulation produced in the plate circuit of the last radio stage of the
system.
HIGH-PASS FILTER. A filter that passes a majority of the high frequencies on to the next circuit and
rejects, or attenuates, the lower frequencies. Also called a LOW-FREQUENCY DISCRIMINATOR.
HITS PER SCAN. The number of times an RF beam strikes a target per antenna revolution.
HIPPI. [High-Performance Parallel Interface] The HIPPI specification defines the mechanical, electrical and signalling protocol for a high performance simplex interface [data transmits in one direction only]. An additional HPPI interface is required to transmit data in a full-duplex mode. The HIPPI interface is obsolete. HIPPI Description
HOLE FLOW. In the valence band, a process of conduction in which electrons move into holes, thereby
creating other holes that appear to move toward a negative potential. (The movement of holes is
opposite the movement of electrons.)
HORIZONTAL AXIS. On a graph, the straight line axis that is plotted from left to right.
HORIZONTAL-DEFLECTION PLATES. A pair of parallel electrodes that moves the electron beam
from side to side in a CRT.
HORIZONTALLY POLARIZED. Waves radiated with their E field component parallel to the earth’s
surface.
HORIZONTAL PATTERN. The part of a radiation pattern that is radiated in all directions along the
horizontal plane.
HORIZONTAL PLANE. An imaginary plane that is tangent (or parallel) to the earth’s surface at a given
location.
HORN. A funnel-shaped section of waveguide used as a termination device and as a radiating antenna.
HORN ANTENNA. See HORN RADIATOR. Antenna Dictionary
HORN RADIATOR. A tapered, tubular or rectangular microwave antenna that is widest at the open end. Radar Dictionary
Next set of "H" definitions and terms
