## Electronics (Mike Jaroch)

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### F

#### FACSIMILE

The method for transmitting and receiving still images. These images can be maps, photographs, and handwritten or printed text [17].

 Keyword(s): FACSIMILE

#### FACTOR

Any of the elements, quantities, or symbols that, when multiplied together, form a product [13].
 Keyword(s): FACTOR

Variations in signal strength by atmospheric conditions [101 [17].

The basic unit of capacitance. A capacitor has a capacitance of 1 farad when a voltage potential of 1 volt across it produces a charge of 1 coulomb [2].

The rotation of the plane of polarization of electromagnetic energy when it
passes a substance influenced by a magnetic field that has a component in the direction of propagation [11].

#### FAST-TIME-CONSTANT CIRCUIT

Differentiator circuit in the first video amplifier that allows only the leading edges of target returns, no matter how small or large, to be used [18].

 Keyword(s): FAST-TIME-CONSTANT CIRCUIT

#### FEEDBACK

The return of a portion of the output of a circuit to its input [8] [18].
 Keyword(s): FEEDBACK

#### FEEDER

A transmission line that carries energy to the antenna [10].
 Keyword(s): FEEDER

#### FEEDHORN

A horn radiator used to feed a reflector [18].
 Keyword(s): FEEDHORN

#### FEP

A synthetic type of insulation (fluorinated ethylene propylene) [4].
 Keyword(s): FEP

#### FERRITE

A powdered and compressed ferric oxide material that has both magnetic properties and light resistance to current flow [11].

 Keyword(s): FERRITE

#### FERRITE SWITCH

A ferrite device that blocks the flow of energy through a waveguide by rotating the electric field 90 degrees. The rotated energy is then reflected or absorbed [11].

 Keyword(s): FERRITE SWITCH

#### FERROMAGNETIC MATERIAL

A highly magnetic material, such as iron, cobalt, nickel, or their alloys [1].

 Keyword(s): FERROMAGNETIC MATERIAL

#### FERRULES

The cylindrical metallic ends of a cartridge fuse [3].
 Keyword(s): FERRULES

#### FIBER OPTICS

Conductors or optical waveguides that readily pass light [17].
 Keyword(s): FIBER OPTICS

#### FIBROUS BRAID

An outer covering used to protect a conductor's insulating material. Commonly made from cotton, linen, silk, rayon, or fiberglass [4].

 Keyword(s): FIBROUS BRAID

#### FIDELITY

(1) The faithful reproduction of a signal. (2) The accuracy with which a system reproduces a signal at its output that faithfully maintains the essential characteristics of the input signal [7] [8] [12] [17].

 Keyword(s): FIDELITY

#### FIELD

The electromagnet which furnishes the magnetic field that interacts with the armature in motors and generators [5].

 Keyword(s): FIELD

#### FIELD EXCITATION

The creation of a steady magnetic field within the field windings by the
application of a dc voltage either from the generator itself or from an external source [5].

 Keyword(s): FIELD EXCITATION

#### FIELD OF FORCE

A term used to describe the total force exerted by an action-at-a-distance
phenomenon such as gravity upon matter, electric charges acting upon electric charges, and magnetic forces acting upon other magnets or magnetic materials [1].

 Keyword(s): FIELD OF FORCE

#### FIELD-EFFECT TRANSISTOR

A transistor consisting of a source, a gate, and a drain. Current flow is controlled by the transverse electric field under the gate [7].

 Keyword(s): FIELD-EFFECT TRANSISTOR FET

#### FILAMENT

The cathode of a thermionic tube, usually a wire or ribbon, which is heated by current passing through it [6].

 Keyword(s): FILAMENT

#### FILM ICs

Conductive or nonconductive material deposited on a glass or ceramic substrate. Used for passive circuit components, resistors, and capacitors [14].

 Keyword(s): FILM ICs

#### FILTER

A selective network of resistors, capacitors, and inductors that offers comparatively little opposition to certain frequencies, while blocking or attenuating other frequencies [6] [9].

 Keyword(s): FILTER

#### FINAL POWER AMPLIFIER

The final stage of amplification in a transmitter [12].
 Keyword(s): FINAL POWER AMPLIFIER, FPA

#### FIRST DETECTOR

See MIXER [18].
 Keyword(s): FIRST DETECTOR

#### FIXED BIAS

A constant value of bias voltage [6] [7] [13].
 Keyword(s): FIXED BIAS

#### FIXED RESISTOR

A resistor having a definite resistance value that cannot be adjusted [1].
 Keyword(s): FIXED RESISTOR

#### FIXED SPARK GAP

A device used to discharge the pulse-forming network. A trigger pulse ionizes the air between two contacts to initiate the discharge [12].

 Keyword(s): FIXED SPARK GAP

#### FLAT LINE

A transmission line that has no standing waves. This line requires no special timing devices to transfer maximum power [10].

 Keyword(s): FLAT LINE

#### FLAT PACK

An IC package [14].
 Keyword(s): FLAT PACK

#### FLEMING VALVE

An earlier name for a diode, or a two-electrode vacuum tube used as a detector [6].
 Keyword(s): FLEMING VALVE

#### FLEXIBLE COAXIAL LINE

A line made with an inner conductor that consists of flexible wire insulated from the outer conductor by a solid, continuous insulating material [10].

 Keyword(s): FLEXIBLE COAXIAL LINE

#### FLIP CHIP

A monolithic IC packaging technique that eliminates the need for bonding wires [14].
 Keyword(s): FLIP CHIP

#### FLIP-FLOP

A device having two stable states and two input terminals (or types of input signals), each of which corresponds with one of the two states. The circuit remains in either state until caused to change to the other state by application of a voltage pulse. A similar bistable device with an input that allows it
to act as a single-stage binary counter [13].

 Keyword(s): FLIP-FLOP

#### FLUX

(1) In electrical or electromagnetic devices, a general term used to designate collectively all the electric or magnetic lines of force in a region [1]. (2) A solution that removes surface oxides from metals being soldered [2] [14].

 Keyword(s): FLUX

#### FLUX DENSITY

The number of magnetic lines of force passing through a given area [1].
 Keyword(s): FLUX DENSITY

#### FLYWHEEL EFFECT

The ability of a resonant circuit to operate continuously because of stored energy or energy pulses [9].

 Keyword(s): FLYWHEEL EFFECT

#### FOCUSING ANODE

An electrode of a CRT that is used to focus the electrons into a tight beam [6].
 Keyword(s): FOCUSING ANODE

#### FOLDED DIPOLE

An ordinary half-wave antenna (dipole) that has one or more additional conductors connected across the ends parallel to each other [10].

 Keyword(s): FOLDED DIPOLE

#### 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)

#### FREQUENCY COMPENSATION NETWORK

Circuit modification used to improve or broaden the linearity of its frequency response [18].

 Keyword(s): FREQUENCY COMPENSATION NETWORK

#### FREQUENCY CUTOFF

The frequency at which the filter circuit changes from an action of rejecting the unwanted frequencies to an action of passing the desired frequencies. Conversely, the point at which the filter circuit changes from an action in which it passes the desired frequencies to an action in which it rejects the undesired frequencies [9].

 Keyword(s): FREQUENCY CUTOFF

#### FREQUENCY DEVIATION

The amount the frequency varies from the carrier frequency [12].
 Keyword(s): FREQUENCY DEVIATION

#### FREQUENCY DIVERSITY

Transmitting (and receiving) of radio waves on two different frequencies
simultaneously [10].

 Keyword(s): FREQUENCY DIVERSITY

#### FREQUENCY METER

A meter used to measure the frequency of an ac signal [3] [16].
 Keyword(s): FREQUENCY METER

#### FREQUENCY MODULATION

Angle modulation in which the modulating signal causes thecarrier frequency to vary. The amplitude of the modulating signal determines how far the frequency
changes, and the frequency of the modulating signal determines how fast the frequency changes [12].

 Keyword(s): FREQUENCY MODULATION, FM

#### FREQUENCY MULTIPLIERS

Special RF power amplifiers that multiply the input frequency [12].
 Keyword(s): FREQUENCY MULTIPLIERS

#### FREQUENCY RESPONSE

Special RF power amplifiers that multiply the input frequency [12].The measure of a servo's ability to respond to various input frequencies [15].
 Keyword(s): FREQUENCY RESPONSE

#### FREQUENCY SCANNING

Varying the output frequency to achieve electronic scanning [18].
 Keyword(s): FREQUENCY SCANNING

#### FREQUENCY SPECTRUM

In a radar, the entire range of frequencies contained in an RF pulse or signal
[18].

 Keyword(s): FREQUENCY SPECTRUM

#### FREQUENCY STABILITY

Refers to the ability of an oscillator to accurately maintain its operating
frequency [9].

 Keyword(s): FREQUENCY STABILITY

#### FREQUENCY SYNTHESIS

A process that uses hetrodyning and frequency selection to produce a signal
[17].

 Keyword(s): FREQUENCY SYNTHESIS

#### FREQUENCY SYNTHESIZER

(1) A frequency source of high accuracy [17]. (2) A bank of oscillators in which the outputs can be mixed in various combinations to produce a wide range of frequencies [18].

 Keyword(s): FREQUENCY SYNTHESIZER

#### FREQUENCY-DETERMINING NETWORK

A circuit that provides the desired response (maximum or minimum impedance) at a specific frequency [8].

 Keyword(s): FREQUENCY-DETERMINING NETWORK

#### FREQUENCY-DIVISION MULTIPLEXING

Multiplexing that transmits and receives the full 360 degrees of each sine wave [17].

 Keyword(s): FREQUENCY-DIVISION MULTIPLEXING

#### FREQUENCY-RESPONSE CURVE

A curve showing the output of an amplifier (or any other device) in terms of voltage or current plotted against frequency with a fixed-amplitude input signal [8].

 Keyword(s): FREQUENCY-RESPONSE CURVE

#### FREQUENCY-SHIFT KEYING

Frequency modulation somewhat similar to continuous-wave (cw) keying in AM transmitters. The carrier is shifted between two differing frequencies by opening and closing a key [12].

 Keyword(s): FREQUENCY-SHIFT KEYING, FSK

#### FRONT-TO-BACK RATIO

The ratio of the energy radiated in the principal direction compared to the
energy radiated in the opposite direction [10].

 Keyword(s): FRONT-TO-BACK RATIO

#### FULL-WAVE RECTIFIER

A circuit that uses both positive and negative alternations in an alternating
current to produce direct current [6] [7].

 Keyword(s): FULL-WAVE RECTIFIER

#### FULL-WAVE VOLTAGE DOUBLER

Consists of two half-wave voltage rectifiers and is used to reduce the output ripple amplitude [7].

 Keyword(s): FULL-WAVE VOLTAGE DOUBLER

#### FUNCTION

A specific purpose of an entity; its characteristic action [13].
 Keyword(s): FUNCTION

#### FUNDAMENTAL FREQUENCY

The basic frequency or first harmonic frequency [10].
 Keyword(s): FUNDAMENTAL FREQUENCY

#### FUSED-ALLOY JUNCTION

See ALLOYED-JUNCTION [7].
 Keyword(s): FUSED-ALLOY JUNCTION

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