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Deck 9 Flashcards

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1
Q

Pass and Advanced

  1. What is immediate precedence?
A

Identified by the precedence prosign ?O.? Delivery time reserved for very urgent messages relating to situations that gravely affect the security of national/allied forces, Examples of use: amplifying report of initial enemy contact or unusual major movements of military forces. Speed of service objective is 30 minutes to l hour.

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2
Q

Pass and Advanced

  1. What is INMARSAT (INTERNATIONAL MARITIME SATELLITE COMMUNICATIONS)?
A

A satellite system that interfaces naval communications for the DON and commercial telecommunications authorized by law.

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3
Q

Pass and Advanced

  1. What is an I/O control clerk?
A

The person responsible for the quality and control of data processing input and output media and products.

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4
Q

Pass and Advanced

  1. What is jettisoning?
A

A type of destruction that is completed by throwing material overboard at sea at a depth of at least 1,000 fathoms or more; also known as Sinking.

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5
Q

Pass and Advanced

  1. What is meant by job dependency?
A

When a job requires the output from another job, it is said to be dependent on another job.

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6
Q

Pass and Advanced

  1. What is job-related information?
A

Information about the resources, media, and time needed for a particular job.

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7
Q

Pass and Advanced

  1. What is a Julian date?
A

Consists of seven digits; the first three digits represent the date, and the last four digits represent the hour and minutes; begins on the first day of the calendar year.

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8
Q

Pass and Advanced

  1. What is MARS (MILITARY AFFILIATE RADIO SYSTEM)?
A

Provides auxiliary communications to military, civil, and/or disaster officials during periods of emergency. Users are licensed by the Federal Communications Commission (FCC).

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9
Q

Pass and Advanced

  1. What is a multiple-address message?
A

A message with two or more addressees.

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10
Q

Pass and Advanced

  1. What is multiprocessing?
A

A computer processing mode that provides for simultaneous processing of two or more programs or routines by use of multiple CPU?s.

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11
Q

Pass and Advanced

  1. What is multiprogramming?
A

A computer processing mode that provides for overlapping or interleaving the execution of two or more programs at the same time by a single processor.

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12
Q

Pass and Advanced

  1. What is programming?
A

A processing mode that allows separate computers, joined by transmission lines, to share a group of common peripherals.

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13
Q

Pass and Advanced

  1. What is a NWPL clerk?
A

Usually assigned by the NWPL custodian and is responsible for the upkeep and maintenance of the NWPL.

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14
Q

Pass and Advanced

  1. What is a NWPL custodian?
A

Is responsible for managing the NWPL; usually assigned to an officer or senior petty officer as a collateral duty.

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15
Q

Pass and Advanced

  1. What is meant by online?
A

A method of data processing that allows users the ability to interact with the computer.

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16
Q

Pass and Advanced

  1. What is an originator?
A

The authority in whose name a message is sent.

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17
Q

Pass and Advanced

  1. What is meant by ?personal for??
A

Messages distributed to a single recipient. Only flag officers, officers in a command status, or their designated representative may originate PERSONAL FOR messages.

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18
Q

Pass and Advanced

  1. What is a planning phase?
A

The initial scheduling phase in which information is gathered from the users.

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19
Q

Pass and Advanced

  1. What is post computer processing?
A

Ensuring output products are complete, accurate, and delivered to the user.

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20
Q

Pass and Advanced

  1. What are precautionary actions or precautionary destruction?
A

An action to remove or reduce the amount of classified material on hand in case emergency destruction becomes necessary at a later time.

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21
Q

Pass and Advanced

  1. What is precedence?
A

A delivery time assigned to a message according to the urgency of that message, based solely on writer-to-reader time.

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22
Q

Pass and Advanced

  1. What is pre-computer processing?
A

Ensuring all inputs are received on time.

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23
Q

Pass and Advanced

  1. What is priority precedence?
A

Identified by the precedence prosign ?P.? Delivery time reserved to messages for essential information for the conduct of operations in progress. Examples of use: situation reports on position of front where attack is imminent, orders to aircraft formation or units to coincide with ground or naval operations. Speed of service objective is 1 to 6 hours.

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24
Q

Pass and Advanced

  1. What is R1) (RESTRICTED DATA)?
A

Pertains to all data concerned with the design, manufacture, or use of nuclear weapons or special nuclear material used in energy production.

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25
# Pass and Advanced 1625. What is real-time processing?
A computer processing method in which data about a particular event is entered directly into the computer as the event occurs and is immediately processed so it can influence future processing.
26
# Pass and Advanced 1626. What is a releaser?
A properly designated individual authorized to release messages for transmission in the name of the command or activity.
27
# Pass and Advanced 1627. What is a restricted area?
Designated spaces that restrict access and control movement within.
28
# Pass and Advanced 1628. What is routine precedence?
Identified by the precedence prosign ?R.? Delivery time assigned to be used for all types of message which docs not justify a higher precedence. Examples of use: administrative, logistics, or personnel matters. Speed of service objective is 3 hours or start of business the following day.
29
# Pass and Advanced 1629. What is sanitizing?
Makes an area or equipment acceptable for access by personnel who are not cleared.
30
# Pass and Advanced 1630. What is a scheduler?
The person responsible for preparing, distributing, and maintaining production schedules.
31
# Pass and Advanced 1631. What is scheduling?
The interface between the user, I/O control, and computer operations.
32
# Pass and Advanced 1632. What is shredding?
A type of destruction that involves using a cross-cut shredding machine. Residue must be reduced to shreds no greater than 3/64 inch wide by 1/2 inch long.
33
# Pass and Advanced 1633. What is a single-address message?
A message with only one addressee.
34
# Pass and Advanced 1634. What is special-handling markings?
Additional markings or designations on some messages that alert the user or communications center that the message requires special attention in handling. Some of these include Caveat, Restricted Data (RD), Formerly Restricted Data (FRD), FOUO, EFTO, SPECAT, and PERSONAL FOR.
35
# Pass and Advanced 1635. What is an SWS (SENIOR WATCH SUPERVISOR)?
When assigned, the senior enlisted person on watch responsible for handling all communications matters; responsible to the CWO.
36
# Pass and Advanced 1636. What is a tech control supervisor?
Responsible for establishing and maintaining required circuits, including initiating actions to restore or bypass failed equipment, quality monitoring, supervising assigned personnel, and controlling procedures for all systems; responsible to the CWO.
37
# Pass and Advanced 1637. What is teleprocessing?
A method of data processing in which communications devices are used.
38
# Pass and Advanced 1638. What is a termination request message?
A message sent to request establishment of circuits with a NCTAMS or NAVCOMTELSTA on a limited or full-time basis.
39
# Pass and Advanced 1639. What is time sharing?
A processing mode in which users share computer system resources through online terminals.
40
# Pass and Advanced 1640. What is a TSCO (TOP SECRET CONTROL OFFICER)?
An officer, senior noncommissioned officer (E-7, E-8, or E-9) or a civilian employee, (GS-7 or above) who is responsible for the receipt, custody, accounting, and disposition of Top Secret material within the command.
41
# Pass and Advanced 1641. What is a TSO (TELECOMMUNICATIONS SERVICE ORDER)?
Used to authorize the start, change, or discontinue circuits, trunks, links, or systems.
42
# Pass and Advanced 1642. What is a TSR (TELECOMMUNICATIONS SERVICE REQUEST)?
Initiates additions, deletions, or changes from the originating command to existing Defense Communications System (DCS) circuits.
43
# Pass and Advanced 1643. What is a TVA (TEMPEST VULNERABILITY ASSESSMENT)?
The vulnerability of a ship, aircraft, shore station transportable equipment, or a contractor facility to susceptibility, environment, and threat.
44
# Pass and Advanced 1644. What is a yankee precedence?
This category is in addition to the four major precedence categories; it is an EMERGENCY COMMAND PRECEDENCE (ECP). It is identified by the precedence prosign ?Y? and limited to designated emergency action command and control messages. Speed of service objective is not fixed. Handled fast as humanly possible with an objective of less than 10 minutes.
45
# Pass and Advanced 1645. What is meant by abort?
Procedure for terminating a program when a mistake, malfunction, or error occurs.
46
# Pass and Advanced 1646. What is Ada?
A high-level programming language designed by the Department of Defense.
47
# Pass and Advanced 1647. What is addressing?
Locating a required piece of data by specific techniques.
48
# Pass and Advanced 1648. What is an arithmetic-logic unit?
The part of the cpu that contains the logic capability and performs all the arithmetic functions (addition, subtraction, multiplication, and division).
49
# Pass and Advanced 1649. What is artificial intelligence?
The capability of a machine to perform human-like intelligence functions, such as learning, adapting, reasoning, and self-correction.
50
# Pass and Advanced 1650. What is an assembler?
A computer program that translates assembly language programs into machine language (object) programs.
51
# Pass and Advanced 1651. What is a BASIC (Beginners All-Purpose Symbolic Instruction Code)?
A high-level, general-purpose programming language used primarily on microcomputers.
52
# Pass and Advanced 1652. What is bit mapping?
A data structure that describes a bit image being held in computer storage.
53
# Pass and Advanced 1653. What is bubble memory?
Method by which information is stored as magnetized dots (bubbles) that rest on a thin film of semiconductor material.
54
# Pass and Advanced 1654. What is C++?
An object-oriented version of the C programming language.
55
# Pass and Advanced 1655. What is cache memory?
A faster memory in which parts of the information in the main (slower) memory or disk are copied.
56
# Pass and Advanced 1656. What is a carrier package?
The portion of the microprocessor chip that plugs into the motherboard.
57
# Pass and Advanced 1657. What is a certifier?
The piece of equipment that is used to certify magnetic tape and check for errors.
58
# Pass and Advanced 1658. What is COBOL (COMMON BUSINESS ORIENTED LANGUAGE)?
A high-level programming language designed for business-type applications.
59
# Pass and Advanced 1659. What is a compiler?
A program that translates a source program written in a high-level programming language into machine language.
60
# Pass and Advanced 1660. What is control memory?
RAM consisting of addressable storage registers, primarily used in mini- and mainframe computers.
61
# Pass and Advanced 1661. What is a degausser?
Device used to erase information from magnetically recorded media, such as a floppy disk or magnetic tape.
62
# Pass and Advanced 1662. What are diagnostic light-emitting diodes?
Indicator lights used to help isolate a hardware failure.
63
# Pass and Advanced 1663. What is a diagnostic routine?
Routine designed to locate a malfunction in the central processing unit or a peripheral device.
64
# Pass and Advanced 1664. What is a distributed system?
A computer system designed to operate as a communications network with all its terminals linked to a remotely located central processing unit.
65
# Pass and Advanced 1665. What is a duplex?
Pertaining to a communications system or equipment capable of transmission in both directions.
66
# Pass and Advanced 1666. What are external diagnostics?
Diagnostics that can be run from a peripheral device.
67
# Pass and Advanced 1667. What is file fragmentation?
Files that are split into many noncontiguous areas on the disk.
68
# Pass and Advanced 1668. What is finite?
To have limits, an end, or a last number.
69
# Pass and Advanced 1669. What is a live-pin connector?
A connector that has five pins, usually to connect a keyboard to the CPU.
70
# Pass and Advanced 1670. What is FORTRAN (FORMULA TRANSLATOR)?
A high-level programming language for scientific and mathematical applications.
71
# Pass and Advanced 1671. What is hard-sectored?
Wedge-shaped storage division on a floppy disk from time of manufacture.
72
# Pass and Advanced 1672. What is a hierarchical directory?
A term used to refer to the organizational method of arranging tiles either in a DOS tree structure or in the tile-and-folder method.
73
# Pass and Advanced 1673. What is a hub?
The center part of the tape reel that attaches to the tape drive.
74
# Pass and Advanced 1674. What is a hypertext?
A document retrieval network having full-text files and dynamic indexes for links among documents.
75
# Pass and Advanced 1675. What is a hypthermagraph?
A piece of equipment that is used to record the temperature and humidity in a computer room.
76
# Pass and Advanced 1676. What is instruction and control?
The portion of the control section that includes the combinational and sequential circuits that make up the decision-making and memory-type functions.
77
# Pass and Advanced 1677. What is an integrated circuit?
A miniaturized chip in which semiconductor components and other such technology combine the functions of a number of conventional components (such as transistors, resistors, capacitors, and diodes).
78
# Pass and Advanced 1678. What are internal diagnostics?
Diagnostics that are run when the computer is started.
79
# Pass and Advanced 1679. What is IPL (Initial Program Load)?
A set of instructions that cause other instructions (the operating system) to be loaded into the main memory of the computer. This must be done each time the computer is turned on.
80
# Pass and Advanced 1680. What is a julian date?
Form of calendar representation within a computer system, indicating the year and the number of elapsed days in the year.
81
# Pass and Advanced 1681. What is a letter-quality mode?
The mode that produces high-quality printed output from a printer
82
# Pass and Advanced 1682. What is a librarian?
Person responsible for the safekeeping of all computer tiles, such as diskettes, disk packs, and magnetic tapes.
83
# Pass and Advanced 1683. What is a local-area network?
A network that normally operates within a well-defined and generally self-enclosed area. The communication stations or terminals are linked by cable.
84
# Pass and Advanced 1684. What is magnetic core storage?
System of storage in which data is represented in binary form by means of directional flow of magnetic Held in tiny, doughnut-shaped arrays of magnetic cores.
85
# Pass and Advanced 1685. What are magnetic domains?
The data that is stored by changing the polarity of the magnetized dots (bubbles).
86
# Pass and Advanced 1686. What are mainframe computers?
This term is usually used to designate large-scale computer systems, although the precise definition of mainframe is the cpu and the control elements of any computer system.
87
# Pass and Advanced 1687. What is a matrix?
Orderly array of symbols by rows and columns.
88
# Pass and Advanced 1688. What are minicomputers?
Midsize computers that are smaller than large-scale systems but with the same components. They are less expensive and have less strict environmental requirements.
89
# Pass and Advanced 1689. What is a modem?
A device that converts data from digital to analog format for transmission on analog transmission lines, and also converts data in analog format to digital format for computer processing.
90
# Pass and Advanced 1690. What are multiple-file directories?
An option of the operating system that allows for several files to be contained in a directory.
91
# Pass and Advanced 1691. What is nonvolatile storage?
Storage medium that retains its data in the absence of power.
92
# Pass and Advanced 1692. What is oxide?
A ferrous material that can be magnetized; also, the recording side of the magnetic tape (dull side).
93
# Pass and Advanced 1693. What is parallel processing?
Handling all the elements of a word or message simultaneously.
94
# Pass and Advanced 1694. What is a pascal?
High-level structured programming language that has gained wide acceptance as a tool for both applications programming and system development.
95
# Pass and Advanced 1695. What is a pentium chip?
A processor chip that can execute many instructions at the rate of two instructions per clock cycle.
96
# Pass and Advanced 1696. What is peripheral equipment?
Equipment used for data entry, storage, or retrieval, but which is not part of the central processing unit. Peripherals include crt displays, terminals, printers, and mass storage (tape, disk, and drum) devices.
97
# Pass and Advanced 1697. What is a photoelectric cell?
A mechanism that when activated by a light source emits an electrical impulse.
98
# Pass and Advanced 1698. What is meant by query?
To make a request for information from a database system.
99
# Pass and Advanced 1699. What is reconciling?
` Refers to the correcting of processing discrepancies.
100
# Pass and Advanced 1700. What is a relational database?
A database organization scheme that treats files as tables of data in which the rows represent fields.
101
# Pass and Advanced 1701. What is meant by rigid?
Refers to the hard metal platters (usually constructed of aluminum or glass) that comprise a hard disk.
102
# Pass and Advanced 1702. What is a schema?
Structure for organizing knowledge relative to context or expectations.
103
# Pass and Advanced 1703. What is a scratching magnetic media?
Making the magnetic media available to the computer operator for reuse.
104
# Pass and Advanced 1704. What is an SCSI adapter?
A general purpose parallel interface designed for connecting one or more computers and one or more peripherals. A total of 8 devices may be connected to one bus.
105
# Pass and Advanced 1705. What is a semiconductor?
A crystalline substance that conducts electricity when it is ?doped? with chemical impurities.
106
# Pass and Advanced 1706. What is a serial?
Pertaining to the sequential occurrence of two or more related activities in a single device.
107
# Pass and Advanced 1707. What is a silicon chip?
Tiny portion of a silicon wafer with thousands of electronic components and circuit patterns etched on its surface.
108
# Pass and Advanced 1.708. What is a simplex?
A mode of data transmission in which data can travel in only one direction on the line. When a terminal is connected to such a circuit, it can be used to either receive or send data to the cpu but not do both.
109
# Pass and Advanced 1709. What are single-file directories?
An option of the operating system that allows for only one tile to be contained in a directory.
110
# Pass and Advanced 1710. What is soft-sectored?
Method of marking sectors or sections on a disk by using information written on the disk.
111
# Pass and Advanced 1711. What is a special function key?
Key on a keyboard to control a mechanical function, initiate a specific computer operation, or transmit a signal that would otherwise require multiple key strokes.
112
# Pass and Advanced 1712. What is a stand-alone?
Self-contained computer system that can work independently, not connected to or under the control of another computer system.
113
# Pass and Advanced 1713. What is stripping?
The removing of the first 100 feet of the magnetic tape. This is the portion that becomes contaminated and causes the most errors.
114
# Pass and Advanced 1714. What is a subschema?
Logical organization of data required for a particular program.
115
# Pass and Advanced 1715. What is a surge protector?
Device that protects electrical equipment from being damaged by short surges of high voltage byfiltering them out.
116
# Pass and Advanced 1716. What is timing?
The regulation of the flow of signals that control the operation of the computer.
117
# Pass and Advanced 1717. What is a tree structured directory?
A disk containing a root directory and several subdirectories.
118
# Pass and Advanced 1718. What is a twenty-five PIN serial connector?
A serial connector that has twenty-five pins, usually used for connecting a printer or monitor to the CPU.
119
# Pass and Advanced 1719. What is a unix?
An operating system that has many high-level utility programs; it is capable of running a number of jobs at once.
120
# Pass and Advanced 1720. What is an unstructured directory?
A disk with only one directory contained on it.
121
# Pass and Advanced 1721. What is a virus?
A computer program which can wreak havoc on a system, either by destroying data or simply changing and slowing up the processing of the system.
122
# Pass and Advanced 1722. What is attenuation?
Loss of communication signal energy.
123
# Pass and Advanced 1723. What is a baseband?
The frequency band occupied by individual information bearing signals before they are combined with a carrier in the modulation process.
124
# Pass and Advanced 1724. What is bisync?
Controlling of data transmission by timing signals generated at the sending and receiving stations.
125
# Pass and Advanced 1725. What is a broadband?
Transmission facilities whose bandwidth is greater than that available on voice-grade facilities.
126
# Pass and Advanced 1726. What is a bus?
Channel or path for transferring data and electrical signals.
127
# Pass and Advanced 1727. What is carrier sense multiple access (CSMA)?
A protocol that controls access to a network?s bus.
128
# Pass and Advanced 1728. What is carrier sense multiple access with collision avoidance (CSMA/CA)?
A protocol that requires carrier sense and in which a data station that intends to transmit sends a jam signal.
129
# Pass and Advanced 1729. What is carrier sense multiple access with collision detection (CSMA/CD)?
A protocol that requires carrier sense and in which a transmitting data station that detects another signal while transmitting, stops sending, sends a jam signal, and then waits for a variable time before trying again.
130
# Pass and Advanced 1730. What is clear to send?
A hardware signal sent from a receiver to a transmitter to indicate that the transmitter can begin sending.
131
# Pass and Advanced 1731. What is crosstalk?
The disturbance caused in a circuit by an unwanted transfer of energy from another circuit.
132
# Pass and Advanced 1732. What is a filter?
A device or program that separates data, signals, or material in accordance with specified criteria.
133
# Pass and Advanced 1733. What is a firewall?
One or more components that control the flow of network traffic between networks.
134
# Pass and Advanced 1734. What is handshaking?
The process through which the rules for exchanging data over a communications line are defined for the two devices involved.
135
# Pass and Advanced 1735. What is impedance?
A measure of electrical resistance.
136
# Pass and Advanced 1736. What is the international standards organization (ISO)?
The international agency responsible for developing standards for information exchange.
137
# Pass and Advanced 1737. What are interrupt request lines?
Physical connections between hardware devices and the interrupt request.
138
# Pass and Advanced 1738. What is a line driver?
A component that includes a transmitter and a receiver.
139
# Pass and Advanced 1739. What is a link?
The communications media used to correct nodes.
140
# Pass and Advanced 1740. What is multitasking?
A mode of operation that provides for concurrent performance of two or more tasks.
141
# Pass and Advanced 1741. What is a network interface card (NIC)?
The expansion card that allows the workstation to communicate with the network.
142
# Pass and Advanced 1742. What is the network operating system (NOS)?
A software package that makes it possible to implement and control a network and that enables users to make use of resources and services on that network.
143
# Pass and Advanced 1743. What is a node?
The point at the end of a branch.
144
# Pass and Advanced 1744. What is noise?
Random electrical signals that become part of a transmission, and that serve to make the signal (information) component of the transmission more difficult to identify.
145
# Pass and Advanced 1745. What is open systems interconnection (OSl)?
The networking standard for interconnecting dissimilar computer systems.
146
# Pass and Advanced 1746. What is protocol?
A formal set of conventions governing the format and control of inputs and outputs between two communicating processes.
147
# Pass and Advanced 1747. What is ready to send?
A hardware signal sent from a potential transmitter to a destination to indicate that the transmitter wishes to begin a transmission.
148
# Pass and Advanced 1748. What is synchronous data link control (SDLC)?
Primary protocol supported under System Network Architecture (SNA).
149
# Pass and Advanced 1749. What is signal-to-noise ratio (SNR)?
The ratio between the signal and noise levels at a given point, usually at the receiving end of the transmission.
150
# Pass and Advanced 1750. What is a time domain reflectometer?
A device used to test the integrity of a section of cable.
151
# Pass and Advanced 1751. What is topology?
The physical or logical layout of a LAN.
152
# Pass and Advanced 1752. What is an antenna?
A device used to radiate or receive radio waves.
153
# Pass and Advanced 1753. What is an antenna coupler?
A device used for impedance matching (tuning) between an antenna and a transmitter or receiver.
154
# Pass and Advanced 1754. What is antenna reciprocity?
The ability of an antenna to both transmit and receive electromagnetic energy.
155
# Pass and Advanced 1755. What is antenna tuning?
The process where an antenna is electrically ?matched? to the output frequency and impedance of the transmitter.
156
# Pass and Advanced 1756. What is attenuation?
A deliberate reduction or an unintended loss in RF signal strength.
157
# Pass and Advanced 1757. What is a bandwidth?
Any section of the frequency spectrum occupied by specific signals.
158
# Pass and Advanced 1758. What is a bidirectional antenna?
An antenna that radiates in or receives most of its energy from only two directions.
159
# Pass and Advanced 1759. What is black?
Cipher text or encrypted text or information.
160
# Pass and Advanced 1760. What is a carrier?
The unmodulated signal originally produced in the oscillator section of a transmitter.
161
# Pass and Advanced 1761. What is a carrier frequency?
The final RF output without modulation. The assigned transmitter frequency.
162
# Pass and Advanced 1762. What is a channel?
A carrier frequency' assignment, usually with a fixed bandwidth.
163
# Pass and Advanced 1763. What is a complex wave?
A transmitted radio signal composed of different frequencies.
164
# Pass and Advanced 1764. What is counterpoise?
The ground plane, or reflective surface, comprising an antenna?s reflected image at a given wavelength.
165
# Pass and Advanced 1765. What is a critical frequency?
The highest transmitted frequency that can be propagated directly upward and still be bent, or ?retracted,? back to Earth.
166
# Pass and Advanced 1766. What is a cycle?
Two complete alternations of alternating current, or one complete revolution in any period of time, equal to 360?.
167
# Pass and Advanced 1767. What is DAMA (DEMAND ASSIGNED MULTIPLE ACCESS SUBSYSTEM)?
Subsystem that mutliplexes several subsystems on one satellite channel.
168
# Pass and Advanced 1768. What is diffraction?
The bending of radio waves around the edges of a solid object or dense mass.
169
# Pass and Advanced 1769. What is a directional antenna?
An antenna that radiates or receives radio waves more effectively in some directions than in others.
170
# Pass and Advanced 1770. What is directivity?
The sharpness or narrowness of an antenna?s radiation pattern in a given plane.
171
# Pass and Advanced 1771. What is a direct wave?
A radio signal that travels in a direct line-of-sight path from the transmitting antenna to the receiving antenna.
172
# Pass and Advanced 1772. What is a dummy load?
A nonradiating device used at the end of a transmission line in place of an antenna for tuning a transmitter. The dummy load converts transmitted energy into heat so that no energy is radiated outward or reflected back.
173
# Pass and Advanced 1773. What is EHF (EXTREMELY HIGH FREQUENCY)?
The band of frequencies from 30 GHZ to 300 Ghz.
174
# Pass and Advanced 1774. What is an electric field?
A field produced as a result of a voltage charge of an antenna.
175
# Pass and Advanced 1775. What is electromagnetic field?
A field produced as a result of a voltage charge on an antenna.
176
# Pass and Advanced 1776. What is electromagnetic energy?
An RF source composed of both an electric and a magnetic field.
177
# Pass and Advanced 1777. What are electromagnetic waves?
Energy produced at the output of a transmitter; also called radio waves.
178
# Pass and Advanced 1778. What is fading?
Variation, usually gradual, in the field strength of a radio signal that is caused by changes in the transmission path or medium.
179
# Pass and Advanced 1779. What is a feed point?
The point on an antenna at which the RF cable that carries the signal from the transmitter is connected.
180
# Pass and Advanced 1780. What is FOT (FREQUENCY OF OPTIMUM TRANSMISSION)?
The most reliable frequency for propagation at a specific Lime.
181
# Pass and Advanced 1781. What is frequency?
The number of complete cycles per unit of time.
182
# Pass and Advanced 1782. What is frequency diversity?
The method in which the information signal is transmitted and received on two separate radio frequencies simultaneously to take advantage of the fact that fading does not occur simultaneously on different frequencies.
183
# Pass and Advanced 1783. What is FSK (FREQUENCY-SHIFT KEYING)?
The process of shifting the incident carrier above and below the carrier frequency to correspond to the marks and spaces of a teleprinter signal.
184
# Pass and Advanced 1784. What is gain?
An increase in signal strength.
185
# Pass and Advanced 1785. What is a gigahertz (GHz)?
A unit of frequency equal to 1000 megahertz.
186
# Pass and Advanced 1786. What is meant by ground?
A term used to denote a common electrical point of zero potential.
187
# Pass and Advanced 1787. What is a ground-plane antenna?
A type of antenna that uses a ground plane (a metallic surface) as simulated ground to produce low- angle radiation.
188
# Pass and Advanced 1788. What is a half-wave dipole antenna?
A common type of half-wave antenna made from a straight piece of wire cut in half. Each half operates at a quarter of the wavelength. It is normally omni-directional with no gain.
189
# Pass and Advanced 1789. What is a hertz (Hz)?
A unit of frequency equal to one cycle per second.
190
# Pass and Advanced 1790. What is a hertz antenna?
An ungrounded half-wave antenna that is installed some distance above ground and positioned either vertically or horizontally.
191
# Pass and Advanced 1791. What is HF(HIGH FREQUENCY)?
The band of frequencies from 3 MHz to 30 MHz.
192
# Pass and Advanced 1792. What is impedance?
The total opposition to the flow of alternating current.
193
# Pass and Advanced 1793. What is an incident wave?
The RF energy that travels from the transmitter to the antenna for radiation.
194
# Pass and Advanced 1794. What is an induction field?
The electromagnetic field produced around an antenna when current and voltage are present on the antenna.
195
# Pass and Advanced 1795. What is a kilohertz (kHz)?
A unit of frequency equal to 1000 hertz.
196
# Pass and Advanced 1796. What is LEASAT?
Leased satellite.
197
# Pass and Advanced 1797. What is LF (LOW FREQUENCY)?
The band of frequencies from 30 kHz to 300 kHz
198
# Pass and Advanced 1798. What is LUF (LOWEST USABLE FREQUENCY)?
The lowest frequency that can be used at a specific time for ionospheric propagation of radio waves between two specified points.
199
# Pass and Advanced 1799. What is a magnetic field?
One of the fields produced when current flows through a conductor or an antenna.
200
# Pass and Advanced 1800. What is a marconi antenna?
A quarter-wave antenna that is operated with one end grounded; it is positioned perpendicular to the Earth.

Advancment Study (In Rate) (13 decks)

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