Electronics (Mike Jaroch)

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].

A waveguide junction in which the junction arm is parallel to the magnetic lines of force in the main waveguide [11].

A point on a waveform or radar beam that corresponds to half the power of the
maximum power point [8] [9] [18].

An antenna, consisting of two rods (1/4 wavelength each) in a single line, that radiates electromagnetic energy [10].

A rectifier using only one-half of each cycle to change ac to pulsating dc
[61 [7].

Two half-wave voltage rectifiers connected to double the input voltage [7].

The operation where one earth terminal yields control to another as a satellite moves out of its area of coverage [17].

A high-vacuum electron tube modulator that uses a driver for pulse forming [18].

A frequency that is a whole-number multiple of a smaller base frequency [9] [10] [12] [17].

A device (preferably a clip-on type) used to absorb heat and protect heat-sensitive components during soldering [4].

Same as a FILAMENT [6].

A radar that provides target altitude, range, and bearing data [18].

(1) A spirally wound transmission line used in a traveling-wave tube to delay the forward progress of the input traveling wave [11]. (2) A large coil of wire. It acts as a coil and is used with variable inductors for impedance matching of high-power transmitters [17].

A building at a transmitter site that contains antenna loading, coupling, and tuning circuits [17].

The electromagnetic unit of inductance or mutual inductance. The inductance of a circuit is 1 henry when a current variation of 1 ampere per second induces 1 volt. In electronics, smaller units are used, such as the millihenry (mH), which is one-thousandth of a henry (H), and the microhenry (μH) which is one-millionth of a henry [2].

A unit of frequency equal to one cycle per second [2].

A half-wave antenna that is installed some distance above ground and positioned either vertically or horizontally [10].

The use of an a.f. voltage to distinguish between available signals. The
incoming cw signal is mixed with locally generated oscillations to give an a.f. output [12].

(1) The process of mixing two frequencies across a nonlinear impedance [12]. (2) The process of mixing the incoming signal with the local oscillator frequency. This produces the two fundamentals and the sum and difference frequencies [17].

Same as SEXADECIMAL. A number system with a base of sixteen; also pertains to
conditions, choices, or selections that have sixteen possible values or states [13].

Pertaining to the number system with a radix of sixteen. It uses the ten
digits of the decimal system and the first six letters of the English alphabet [13].

The band of frequencies from 3 megahertz to 30 megahertz [17].

See PEAKING COIL [8].

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 [9].

The number of times an RF beam strikes a target per antenna revolution [18].

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.) [7]

On a graph, the straight line axis that is plotted from left to right [10].

The part of a radiation pattern that is radiated in all directions along the
horizontal plane [10].

An imaginary plane that is tangent (or parallel) to the earth's surface at a given
location [11] [18].

A pair of parallel electrodes that moves the electron beam from side to side in a CRT [6].

Waves radiated with their E field component parallel to the earth's surface [10].

A funnel-shaped section of waveguide used as a termination device and as a radiating antenna [11].

See HORN RADIATOR [18].

A tapered, tubular or rectangular microwave antenna that is widest at the open end [18].

The English unit of power equal to work done at the rate of 550 foot-pounds per second; equal to 746 watts of electrical power [1].

A permanent magnet or electromagnet bent into the shape of a horseshoe or
having a U-shape to bring the two poles near each other [1].

A carrier, which may be either a hole or an electron, that has relatively high energy with respect to the carriers normally found in majority-carrier devices [11].

A semiconductor diode in which hot carriers are emitted from a semiconductor
layer into the metal base. Also called HOT-ELECTRON DIODE. An example is the Schottky barrier diode [11].

A meter movement that uses the expansion of a heated wire to move the pointer of a meter; measures dc or ac [3].

A circuit where passive components (resistors, capacitors) are deposited onto a
substrate made of glass, ceramic, or other insulating material. Then the active components (diodes, transistors) are attached to the substrate and connected to the passive components on the substrate with a very fine wire [7].

Two or more integrated circuit types, or one or more integrated circuit types and discrete components on a single substrate [14].

A waveguide junction that combines two or more basic T-junctions [11].

See BALANCED MIXER [18].

A hybrid-waveguide junction that combines a series of E-type T-junctions in a ring configuration. When properly terminated, energy is transferred from any one branch into any two of the remaining three branches [11] [18].

An instrument used to measure specific gravity. In batteries hydrometers are used to indicate the state of charge by the specific gravity of the electrolyte [1].

The time lag of the magnetic flux in a magnetic material behind the magnetizing force producing it. Caused by the molecular friction of the molecules trying to align themselves with the magnetic force applied to the material [2].

The power loss in an iron-core transformer or other alternating-current device as a result of magnetic hysteresis [2].