Unit 4-1

Front 1

What method does an A-scan indicator use to display video?

Back 1

Deflection Modulation

Front 2

What target information is provided by the plan position indictor (PPI)

Back 2

Range and Azimuth

Front 3

What type of scan an "paint" a map of the area, to include the areas of heavy rain or clouds?

Back 3

Plan position indicator

Front 4

In a raster scan indicator, how many vertical scan periods does it take to produce one complete picture?

Back 4

two (2)

Front 5

which indicator component determines the overall operation of the indicator?

Back 5

data processing circuits

Front 6

Which indicator components main purpose is to control the intensity of the cathode ray tube electron beam?

Back 6

the Video circuits

Front 7

Digital display data from the data processing circuits is converted into analog drive signals in the

Back 7

deflection circuits

Front 8

Electromagnetic deflection is accomplished by applying

Back 8

current through the deflection coil

Front 9

The vacuum in a cathode ray tube...

Back 9

prevents collisions between electrons in the beam and air molecules

Front 10

What is the leading edge to leading edge spacing between P1 and P3 of Mode 3?

Back 10

8 usec.

Front 11

(603) The frequency use for IFF/SIF interrogations is

Back 11

1030 MHz

Front 12

(604) An X pulse is present in an SIF code train when...

Back 12

the aircraft is a pilotless drone or missle

Front 13

(604) Which special response explains a 7500 reply?

Back 13

Hijacking

Front 14

(605) the AN/UPM-155 radar test set is capable of testing

Back 14

interregators and associated components

Front 15

(605) What possible input voltages may be supplied to the an/upm-155 test set for operation?

Back 15

115 vac or 230 vac

Front 16

(606) What three components are included within electronic combat (EC)?

Back 16

command,control, and communication countermeasures (CjCM),suppresion of enemy air defenses (SEAD), and electronic warfare (EW)

Front 17

(606) What are the three primary areas of electronic warfare?

Back 17

electronic warfare support (ES), electronic attack (EA) and electronic protection (EP)

Front 18

(607) What is the relatively new concept of employing electronic warfare support (ES)

Back 18

to provide a tactically oriented immediate response

Front 19

(607) The primary role of the electronic warfare support (ES) is a wartime function that provides the military commander a capability that can

Back 19

integrate with other operational forces

Front 20

(608) Predictable external factors that affect electronic attack (EA) are

Back 20

victim radar characteristics and burn through range

Front 21

(608) the three major categories that nose jammers can be divided into are

Back 21

spot jammers, sweep jammers, and barrage jammers

Front 22

(608) A decoy is...

Back 22

an expendable aircraft like vehicle used to provide deception

Front 23

(609) What transmitter fix is for synchronous pulsed jammers?

Back 23

staggered pulse recurrent frequency

Front 24

(609) What technique is used in a strong clutter or jamming enviroment to improve target detection?

Back 24

Fast time constant (FTC)

Front 25

(609) What is the primary receiver on many of the radar sets?

Back 25

Linear

Front 26

(609) Personnel must be aware of hostile electronic warfare support signal intelligent capabilities when radiating electromagnetic energy to prevent...

Back 26

highlighting their intentions or capabilities

Front 27

(610) What characteristic of frequency does a radar target moving towards the wsr-88d radar exhibit?

Back 27

a higher frequency than the original broadcast

Front 28

(610) Transverse velocity is the velocity component of the

Back 28

targets moving perpendicular to the radar beam

Front 29

(610) The velocity azimuth display (VAD) is

Back 29

a plot of radial velocity as a function of azimuth

Front 30

(610) Given a wind blowing directly from the east, the antenna scan direction that yields the highest velocity azimuth display profile amplitude is an antenna bearing of...

Back 30

east and west

Front 31

(611) What is an indication of velocity aliasing ambiguity?

Back 31

target motion away from the radar may suddenly appear to be moving towards the radar

Front 32

(611) What contemporary term is used to express the display of targets at the wrong range due to system pulse repetition frequency (PRF)

Back 32

range folding

Front 33

[601] When would you use an electrostatic indicator instead of an electromagnetic indicator?

Back 33

when small, lightweight, compact components are used

Front 34

[601] How is information presented on the A-scan indicator?

Back 34

as a vertical deflection, deflection modulated

Front 35

[601] How is time represented on an A-scan indicator?

Back 35

by the horizontal distance from the start trigger to the input signal

Front 36

[601] How is video presented on a B-scan indicator?

Back 36

intensity-modulated electon beam that presents targets as bright spots

Front 37

[601] What type of radar uses the B-scan indicator?

Back 37

the PAR

Front 38

[601] How would elevation and range be presented on a B-scan indicator?

Back 38

on the upper portion

Front 39

[601] What target information does a PPI scan present?

Back 39

range and azimuth

Front 40

[601] What type of pattern does a raster scan indicator use to scan the CRT?

Back 40

scanning electron beam

Front 41

[602] what compenents do all indicators have regardless of type?

Back 41

power supplies, data processing circuits, video circuits, deflection circuits and CRT/front panel controls

Front 42

[602] What furnishes the operating voltages for the CRT?

Back 42

the High Voltage Power Supply

Front 43

[602] List the three functions performed by the data processing circuits.

Back 43

Data Calculation, Interface, and Data Distribution

Front 44

[602] How do the video circuits protect the CRT during certain malfunctions?

Back 44

by disabling the HVPS and providing blanking

Front 45

[602] How do the data processing circuits specify beam position?

Back 45

using X and Y coordinates, with the orgin at the center

Front 46

[602] List the two types of CRT's

Back 46

electrostatic or electromagnetic

Front 47

[602] What part of the CRT shields the electron beam from unwanted electric fields?

Back 47

the aquadag

Front 48

[602] What is the primary hazard involved with high-vacuum CRT's?

Back 48

high vacuum and large surface area make it vulnerable to dangerous implosions

Front 49

[602] What do the front panel controls allow the operator to do?

Back 49

select input signals, messages, operating parameters, and adjust indicator format

Front 50

[603] What are the SIF modes used to interrogate an aircraft?

Back 50

Mode 1, 2, 3 and C

Front 51

[603] What is the spacing between P1 and P3 pulses for the four SIF modes?

Back 51

3, 5, 8, 21 microseconds

Front 52

[603]What is the pulse width of P1, p2, and P3 pulses

Back 52

.08 us wide

Front 53

[603] What is the xmitted frequency of the interrogation pulses?

Back 53

1030 mHz

Front 54

[603] What is the purpose of transmitting a P2 pulse?

Back 54

to eliminate side lobe reception

Front 55

[604] What type of code and what are the increments of the altitude information received in Mode C?

Back 55

a grey code train of pulses in 100 ft. increments

Front 56

[604] What is the width of any given pulse in a SIF reply code train?

Back 56

0.45 us wide

Front 57

[604] What is the bracket pulse spacing on a normal SIF code train?

Back 57

20.3 us

Front 58

[604] What signifies that the SIF reply has been xmitted by a missle or drone?

Back 58

an X pulse

Front 59

[604] What is the purpose of a reply pulse that is 4.35 us after the last bracket pulse of a SIF code train and what is it called?

Back 59

Identification of Position, when 2 or more aircraft are responding with the same code and are too close for the operator to diferentiate

Front 60

[604] What is the only IFF/SIF mode that can decode civilian emergencies?

Back 60

Mode 3/A

Front 61

[604] How is a communications emergency received by the ground station?

Back 61

By a 7600 emergency reply code

Front 62

[604] Which modes will decode military emergencies?

Back 62

They can be received in any SIF mode, including C

Front 63

[604] Describe a Mode 4 IFF reply...

Back 63

It consists of three 0.5 us pulses spaced 1.8 us apart

Front 64

[606] What is the goal of electronic combat? (EC)?

Back 64

to control selected parts of the electromagnetic spectrum, thus denying its use to the enemy while retaining effective use for friendly forces

Front 65

[606] What are three primary areas of electronic warfare (EW)?

Back 65

Electronic warfare support, Electronic attack, and Electronic Position

Front 66

[606] What does electronic warfare support, electronic attack, and electronic protection do upson initiation of hostilities?

Back 66

ES updates intelligence; EA and EP are supplied to support friendly forces

Front 67

[607] What does ES provide to its consumer?

Back 67

Timely and comprehensive information to the activities it supports

Front 68

[606] What is the difference between ES and signal intelligence assets?

Back 68

ES assets are totally controlled by the theatre command while SIGINT assets are responsive to national level tasking requirements

Front 69

[607] What activities apply to ES?

Back 69

Threat location, detection, warning, emitter avoidance, target acquisition, homing and destruction or suppression

Front 70

[607] What is required to exploit the EM environment?

Back 70

Timely interception and analysis and each xmission likely to contain information that can influence current or future operations

Front 71

[607] What information and techniqes does ES provide?

Back 71

Information on the location of emitters and information and techniques useful in reducing the effectiveness of hostile weapons and tactics

Front 72

[608] What is electronic attack?

Back 72

The division of EW involving the use of electromagnetic or directed engery to attack personnel, facilities, or equipment with the intent of degrading, neutralizing, or destroying enemy combat capability

Front 73

[608] What is jamming?

Back 73

The radiation or reradiation of signals to interfere with the operation of a radar receiver

Front 74

[608] What are the predictable external factors that effect jamming?

Back 74

Burn through range, victim radar characteristics, and jamming characteristics

Front 75

[608] Jammers are divided into what two categories?

Back 75

noise jamming and deception jamming

Front 76

[608] What is chaff made out of and how does it work?

Back 76

Chaff consists of a large number of metallic strips designed to match half the wavelength of the victim radar's RF. It absorbs and reradiates EM energy to create a radar echo

Front 77

[609] What is electronic protection?

Back 77

The part of EW that includes the measures taken to protect personnel, facilities, equipment..etc.

Front 78

[609] What are the common transmitter fixes?

Back 78

Frequency agility, CPACS, staggered PRF

Front 79

[609] What is meant by frequency agility?

Back 79

The ability of a radar to rapidly change from one frequency to another

Front 80

[609] What are different types of EP receivers?

Back 80

Linear, logarithmic, lin-log, and Dicke-fix receivers

Front 81

[609] What type of antenna is added to provide for side lobe cancelling?

Back 81

An omnidirectional side lobe reference antenna

Front 82

[610] What term describes velocity elements parallel to the radar beam?

Back 82

Radial Velocity

Front 83

[610] What relationship between target movement and beam orientation would result in a radial velocity of zero?

Back 83

the target movement would have to be perpendicular to the beam

Front 84

[610] What purposes does the velocity azimuth display algorithm serve in the wsr-88d?

Back 84

used to generate wind profiles

Front 85

How are target velocities moving toward the radar expressed?

Back 85

as negative values