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Vessel Handling and Radar > Radar > Flashcards

Radar Flashcards

1
Q

What does radar stand for

A

Radio Detection and Ranging

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2
Q

How does Radar work

A

On the “echo principle”

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3
Q

What does radar do once it transmits

A

Goes into receive mode.

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4
Q

What is a radar nautical mile

A

80,915 NM out in one second (161,830 miles per sec) remember

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5
Q

What is signal attenuation

A

absorption or loss of power

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6
Q

X band radar

A

3cm Radar short range

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7
Q

S Band

A

10 cm radar long range

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8
Q

What is the PRR

A

Number of pulses transmits in one second (pulse repetition rate)

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9
Q

Pulse length

A

main factor in determining minimum measurable range

Travels 328 yards in one microsec

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10
Q

What is resting time

A

time elapsed between the end of the first transmission and beginning of the second transmission measured in microseconds

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11
Q

What two factors are in PRR

A

Pulse rate and resting time
How many times it happens in one second is the PRR

Also prt

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12
Q

What is the main factor in maximum effective range

A

PRR

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13
Q

What is the main factor in determining minimum measurable range

A

PL pulse length

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14
Q

Where do you want to put the VRM when measuring distance

A

inside leading edge or spot closest to you

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15
Q

6/1

A

Range 6 miles, each ring 1 NM

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16
Q

What is the best way to fix posititon by Radar

A

two or more ranges

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17
Q

How is pulse length measured

A

miroseconds

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18
Q

What does PL determine

A

minimum measurable range

19
Q

What does PRR determine

A

Maximum measurable range

20
Q

What is bearing resolution

A

ability of the radar to distinguish as two separate targets at the same range but at different bearings

21
Q

What is the primary value of PI lines

A

early warning for set and drift

22
Q

Why is it not acceptable to fix position using floating aids?

A

Because buoys are not in a fixed position and may be off station enough to cause problems

23
Q

How many logs does each Radar need

A

x2 maintenance and performance log

24
Q

What does the performance log list

A

type, make and model radar
Idiosyncrasy

25
Q

What does the maintenance log list

A

Date of last operator maintenance performed
type, make and model radar
scheduled maintenance or required maintenance

26
Q

If some one is working on RADAR what do you need to do

A

post men aloft sign lock out tag out turn off radar

27
Q

What does the modulator do

A

establishes the time base (its the brain)

28
Q

Transmitting

A

ATR switch open TR closed

29
Q

Receiving

A

ATR switch closed TR open

30
Q

What part of the radar is responsible for building the intermidiate frequency

A

LNA linear noise amplifier cleans it up

31
Q

What could cause a misdirect pulse or false/indirect echo

A

blind or shadow spot caused by an obstruction to the radar antenna

32
Q

What would cause you to have multiple echos

A

passing very close to another vessel

33
Q

What type radar is most effected by weather

A

3CM x band

34
Q

What causes spoking

A

synchronizer malfunction

35
Q

What would cause your radar to displaying Serrated Range Rings?

A

DC power malfunction

36
Q

Indirect Echoes are associated with?

A

Blind spots

37
Q

Easiest thing to obtain on RM line

A

CPA

38
Q

If R/M same spot what do you have

A

You and target same course and speed

39
Q

If e and m on same location what do you have?

A

Target DIW

40
Q

E to m

A

Their course and speed

41
Q

R to m

A

Relative motion

42
Q

E to r

A

Oir course and speed

43
Q

What is the difference between vrm and ebl

A

Vrm measures to inside leading edge
Ebl is measured center mass

44
Q

Two modes

A

Stablized unstablized
North up/ heads up

Vessel Handling and Radar (2 decks)

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