Idw Us 206: Technical Fundamentals

Front 1

Amplitude

Back 1

Relative indication of the amount of energy the wave transmits

Front 2

Wavelength

Back 2

Distance in space occupied by one cycle of a radio wave at any given instant

Front 3

Cycle

Back 3

Combination of one complete positive and one complete neagtive alternation

Front 4

Frequency

Back 4

Number of vibrations, or cycles, of a wave train in a unit of time

measured in Hertz

Front 5

Ground Wave

Back 5

Radio waves that travel near the surface of the Earth

Front 6

Sky Wave

Back 6

Radio waves that are reflected back to Earth from the ionosphere

Front 7

Space Wave

Back 7

Hase two paths

Transmit ant to recieve ant directly through air
(Primary)

Other is reflected from the ground

Front 8

Natural Horizon

Back 8

Line of sight horizon

Front 9

Radio horizon

Back 9

1/3 farther than natural horizon

Front 10

Refraction

Back 10

Bending of the waves as they move from one medium to another in which the velocity of propagation is different

Front 11

Diffraction

Back 11

Radio wave that meets an obstacle has a natural tendency to bend around the obstacle

Front 12

Reflection

Back 12

Bouncing off objects

Front 13

Aborption

Back 13

Loss of engergy on radio wave

Pronounced effect on Recieve Strength and Distance of comms

Front 14

Attenuation

Back 14

Decrease in intensity of signal, beam, or wave as result of absorption of energy and of scattering out of the path of a detector.

Front 15

3 basic characteristics of sound

Back 15

source or transmitter

Medium for carrying sound (air, water, metal, etc)

Detector or receiver

Front 16

Reciprocity

Back 16

Interchangeability of the same antenna for transmitting and receiving

Front 17

Gain

Back 17

Focused the radiated RF into narrower patterns. The higher the gain of an antenna the smaller the effective angle of use.

Front 18

Polarization

Back 18

Orientation of the electric field vector of the elecromagnetic wave produced by the antenna.

Vertical, Horizontal, Elliptical

Front 19

Discuss the basic concept of how RADAR works

Back 19

Radar dish, or antenna, transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns an tny part of the wave's energy to a dish or antenna which is usually at the same site as the transmitter.

Front 20

Doppler Effect

Back 20

The apperant change in freq or pitch when a sound source moves either toward or away from the listener, or the listener moves toward or away.

Front 21

ECHO

Back 21

Repetition of a signal by reflection from a surface

Front 22

Sea Return

Back 22

Radar echoes caused by waves of the sea

Front 23

Clutter

Back 23

Unwanted radio frequency signals in a search radar

Front 24

Ground Clutter

Back 24

Unwanted radar echoes caused by terrain and man-made features

Front 25

Sea Clutter

Back 25

Unwanted radio Frequency signals caused by changing conditions at sea (waves, fog, etc)

Front 26

Range

Back 26

Max distance at which a radar set is irdinarily effective in detecting objects.

Front 27

Virus

Back 27

Malicious program that modifies other hose files or boot areas to replicate. Rely on users to transfer file in order to spread to other computers.

Front 28

Trojan Horse

Back 28

Non-replicating program masquerading as a legitimate program

Front 29

Worm

Back 29

Replicating code that uses its own program coding to spread with minimal user involvement. Can spread across networks.

Front 30

Mixture

Back 30

Bundles some of the worst aspects of viruses, worms, trojan horses and malicious code into one single threat.

Front 31

Who came up with a standard naming scheme for malicious code?

Back 31

Computer Antivirus Researchers Organization
(CARO)

Called the CARO naming convention

Front 32

What are the parts of a virus name?

Back 32

-Family Name
-Group Name
-Major Variant
-Minor Variant
-Modifier

Front 33

What are some of the rules for naming a virus?

Back 33

-Don't name it after a location
-Don't use company or brand names
-Don't invent a new name if there is an existing name

Front 34

Describe the functions of Active-X.

Back 34

Interactive technology used to run programs over the Internet

Example: ActiveX component can scan fro viruses using a browser

Front 35

Describe the dangers associated with Active-X.

Back 35

ActiveX control can do almost anything it wants.

Has full access to your system including Hard Drive and system functions

Front 36

Describe the function of Macros

Back 36

Language built into a word processing document (Word)

Some applications run automatically when document is opened

Front 37

Describe the dangers associated with Marco Viruses

Back 37

Macro virus can copy its self to default word document and then infect any word document opened.

Front 38

Hoax Viruses

Back 38

Chain mail claiming gloom and doom

No true danger. Only trust virus alerts from a valid source.