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 [11].
H-TYPE T-JUNCTION
A waveguide junction in which the junction arm is parallel to the magnetic lines of force in the main waveguide [11].
HALF-POWER POINT
A point on a waveform or radar beam that corresponds to half the power of the maximum power point [8] [9] [18].
HALF-WAVE DIPOLE ANTENNA
An antenna, consisting of two rods (1/4 wavelength each) in a single line, that radiates electromagnetic energy [10].
HALF-WAVE RECTIFIER
A rectifier using only one-half of each cycle to change ac to pulsating dc [61 [7].
HALF-WAVE VOLTAGE DOUBLER
Two half-wave voltage rectifiers connected to double the input voltage [7].
HAND OVER
The operation where one earth terminal yields control to another as a satellite moves out of its area of coverage [17].
HARD-TUBE MODULATOR
A high-vacuum electron tube modulator that uses a driver for pulse forming [18].
HARMONIC
A frequency that is a whole-number multiple of a smaller base frequency [9] [10] [12] [17].
HEAT SHUNT
A device (preferably a clip-on type) used to absorb heat and protect heat-sensitive components during soldering [4].