## Electronics (Mike Jaroch)

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### F

#### FORBIDDEN BAND

The energy band in an atom lying between the conduction band and the valence band. Electrons are never found in the forbidden band but may travel back and forth through it. The forbidden band determines whether a solid material will act as a conductor, a semi-conductor, or an insulator [7].

 Keyword(s): FORBIDDEN BAND

#### FORWARD AGC

The type of AGC that causes an amplifier to be driven towards saturation [17].
 Keyword(s): FORWARD AGC

#### FORWARD BIAS

An external voltage that is applied to a PN junction in the conducting direction so that the junction offers only minimum resistance to the flow of current. Conduction is accomplished by majority current carriers (holes in P-type material; electrons in N-type material) [7] [13] [14].

 Keyword(s): FORWARD BIAS

#### FORWARD RESISTANCE

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

 Keyword(s): FORWARD RESISTANCE

#### FOSTER-SEELEY DISCRIMINATOR

A circuit that uses a double-tuned RF transformer to convert frequency variations in the received FM signal to amplitude variations. Also known as a phase-shift discriminator [12].

 Keyword(s): FOSTER-SEELEY DISCRIMINATOR

#### FOUR-ELEMENT ARRAY

An antenna array with three parasitic elements and one driven element [10].
 Keyword(s): FOUR-ELEMENT ARRAY

#### FRAMING

The process of synchronizing a facsimile receiver to a transmitter. This allows proper picture reproduction [17].

 Keyword(s): FRAMING

#### FREE CHARGES

Those electrons that can be moved by an externally applied voltage [7].
 Keyword(s): FREE CHARGES

#### FREE-SPACE LOSS

The loss of energy of radio waves caused by the spreading of the wavefront as it travels from the transmitter [10].

 Keyword(s): FREE-SPACE LOSS

#### FREQUENCY

(1) The number of complete cycles per second existing in any form of wave motion, such as the number of cycles per second of an alternating current [2] [10]. (2) The rate at which the vector that generates a sine wave rotates [12].

 Keyword(s): FREQUENCY (f)

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