FA 8

Question 1

A wave of ___ amplitude, frequency and phase which can be ___ in amplitude, frequency or phase to convey information.

Answer 1

Constant
Varied

Question 2

The electric field is made to ___ degrees through space in either a left or right direction. This is achieved by transmitting ___ ___ waves of equal amplitude and ___ but 90 degrees out of phase at the same time. This results in the waves rotating in space. The wave rotates rapidly at one full revolution per cycle.

Answer 2

360
Two Polarised
Frequency

Question 3

Military bands
Charlie
Delta
India
Bravo
Echo

Answer 3

Charlie 0.5 - 1 GHz
Delta 1-2 GHz
India 8-10 GHz
Bravo 250-500 MHz
Echo 2-3 GHz

Question 4

___ ___ is the ratio between the ___ PD to the effective PD.

Answer 4

Pulse compression
Actual
Effective

Question 5

The scan of a radar is the ___ of a beam of ___ in a ___ ___ in order to cover a region of space.

Answer 5

Directing
Energy
Set Pattern

Question 6

A decibel is a ___ measure of the ratio between the output and the input of an electrical or acoustical circuit. Symbolised by __

Answer 6

Logarithmic
Ratio
dB

Question 7

Power gain is any ___ in power when a signal is transmitted form one point to another, also expressed in decibels.

Answer 7

Increase
Decibels

Question 8

Moving Target Indicator (MTI) Radars will only show returns from ___ targets.

Answer 8

Moving

Question 9

IFF FREQUENCIES
Interrogator
Transponder

Answer 9

1030
1090

Question 10

Calculate frequencies
SOL DIVIDED BY WL = FREQ
60m
50km
23cm

Answer 10

5MHz
6KHz
1.3GHz

Question 11

Four categories of polarisation.

Answer 11

LERC
Linear
Elliptical
Rotating
Circular

Question 12

Radar kilometre is equal to

Answer 12

6.66 usecs

Question 13

MTUR is the ___ range radar can detect an object before range___occur.

Answer 13

Maximum
Ambiguities

Question 14

Two characteristics the pulse duration determines in a radar.

Answer 14

Minimum range
Range resolution

Question 15

5 types of signal fading.

Answer 15

PISSA
Polarisation
Interference
Skip
Selective
Absorption

Question 16

CAD

Answer 16

Continuous Amplitude Digitisation

Question 17

BAD

Answer 17

Burst Amplitude Digitisation

Question 18

TBD

Answer 18

Time burst Digitisation

Question 19

List 3 types digital recording media

Answer 19

PDW
PPDW
PDIF

Question 20

What is RCS influenced by

Answer 20

Target Size
Target Shape
Target Orientation
Construction Materials

Question 21

Pulse repetition interval is the time period between the ___ of one pulse to the ___ of the next successive pulse within the pulse train. PRI is measured in ___ .

Answer 21

Leading Edge
Trailing Edge
Microseconds

Question 22

Two types of stagger interpulse modulations.

Answer 22

Simplex
Complex

Question 23

What are the causes of unintentional jitter interpulse modulation.

Answer 23

Equipment failure in timing circuits
Fluctuations in power supplies.

Question 24

Range resolution is the ability to discriminate between

Answer 24

grouped objects at different ranges but on the same bearing.

Question 25

Advantages of intrapulse modulation

Answer 25

All the above EP feature Reduced peak power requirements Increased range Increased range resolution

Question 26

The scan categories for radars are

Answer 26

Primary Secondary Combined Passive

Question 27

What is the basic principle of a receiver

Answer 27

The basic principle of a receiver is a Part of a radio system that extracts information from radio frequency energy intercepted by the antenna.

Question 28

6 descriptive characteristics

Answer 28

PMMUST Platform Type Function Modulation Type User Scan Type TOI

Question 29

2 advantages of LPI radar

Answer 29

LPI detection Increased range

Question 29

List three uses of moving target indicators radars

Question 29

T OR F . Reducing mutual interference and overcoming MTI blind speeds can be achieved by using a PRI stagger

Answer 29

TRUE

Question 30

T OR F. PFM is when the PRI'S increase and/or decrease in the same time period.

Answer 30

TRUE

Question 31

If the percentage of jitter is less than 1 percent the jitter is assumed to be intentional

Answer 31

FALSE

Question 32

T OR F. The range resolution of a radar with a PD of 3.5 usecs is 525m

Answer 32

TRUE

Question 33

Three types of Intrapulse modulation

Answer 33

PMOP AMOP FMOP

Question 34

T OR F. The basic principle of a receiver is a Part of a radio system that extracts information from radio frequency energy intercepted by the antenna.

Answer 34

TRUE

Question 35

T OR F. Time burst digitisation uses much less storage space than CAD and BAD

Answer 35

TRUE

Question 36

A ___ is considered a detectable threat and it utilises an uplink and downlink.

Answer 36

UAV/UAS

Question 37

T OR F. Synthetic Aperture radar is strictly forward looking.

Answer 37

FALSE