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B

BACK RESISTANCE

The larger resistance value observed when you are checking the resistance of a
semiconductor [16].


BALANCED MIXER

A waveguide arrangement that resembles a T and uses crystals for coupling the
output to a balanced transformer [18].


BALANCED PHASE DETECTOR

A circuit that controls the oscillator frequency (afc) [17].

BAND-REJECT FILTER

A tuned circuit that does not pass a specified band of frequencies [9] [16].

BANDPASS FILTER

A filter that allows a narrow band of frequencies to pass through the circuit.
Rejects or attenuates frequencies that are either higher or lower than the desired band of frequencies [9]
[16].


BANDWIDTH

The difference between the highest usable frequency of a device (upper frequency limit) and the lowest usable frequency of the device (lower frequency limit) - measured at the half-power
points [8] [9] [12] [15].


BARRETTER

A type of bolometer characterized by an increase in resistance as the dissipated power rises [16].


BASE

The element in a transistor that controls the flow of current carriers [7]. (1) A reference value. (2) A number that is multiplied by itself as many times as indicated by an exponent. (3) Same as radix. (4) The region between the emitter and collector of a transistor that receives minority carriers injected from the emitter. It is the element that corresponds to the control grid
of an electron tube [13].


BASE-INJECTION MODULATOR

Similar to a control-grid modulator. The gain of a transistor is varied by changing the bias on its base [12].


BATTERY

A device for converting chemical energy into electrical energy [1].


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