## Electronics (Mike Jaroch)

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### B

#### BAND-REJECT FILTER

A tuned circuit that does not pass a specified band of frequencies [9] [16].
 Keyword(s): BAND-REJECT FILTER

#### 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].

 Keyword(s): BANDPASS FILTER

#### 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].

 Keyword(s): BANDWIDTH

#### BARRETTER

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

 Keyword(s): BARRETTER

#### 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].

 Keyword(s): BASE

#### BASE-INJECTION MODULATOR

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

 Keyword(s): BASE-INJECTION MODULATOR

#### BATTERY

A device for converting chemical energy into electrical energy [1].
 Keyword(s): BATTERY

#### BATTERY CAPACITY

The amount of energy available from a battery. Battery capacity is expressed in
ampere-hours [1].

 Keyword(s): BATTERY CAPACITY

#### BAUD

A measurement of speed based on the number of code elements or units per second [17].
 Keyword(s): BAUD

#### BAY

Part of an antenna array [10].
 Keyword(s): BAY

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