Radar

Question 1

X-band radar corresponds to a wavelength ___ cm. Frequency range is ____ to _____ MHz.

Answer 1

3 cm;
9300 to 9500 MHz

Pub 1310 p.1

Question 2

S-band radar corresponds to a wavelength ___ cm. Frequency range is ____ to _____ MHz.

Answer 2

10 cm
2900 to 3100 MHz

Pub 1310 p.1

Question 3

Distance to the radar horizon is found by the following formula:

Answer 3

d (nautical miles) = 1.22 x (sq. Root)h in feet

Pub 1310 pg 9

Question 4

Which band radar suffers less attenuation, and is therefore better in rain?

Answer 4

10 cm

Pub 1310 p. 13

Question 5

Which type of weather factor causes the most attenuation?

Answer 5

Rain

1310 p. 13

Question 6

Minimum range detection is largely a function of ______.

Answer 6

Pulse length. (Too long of a pulse on a short range will cause the echo to return while still transmitting)

1310, p. 15-16

Question 7

Better range accuracy and resolution may be obtained with a shorter or longer pulse length?

Answer 7

Shorter.

1310 p. 16

Question 8

To maximize detection range, pulse length should be _____.

Answer 8

Longer

1310 p. 16

Question 9

What is the measure of capability of a radar to detect the separation between targets on the same bearing, but having small differences in range?

Answer 9

Range resolution

1310 p 16

Question 10

Radar Vertical beam width is usually between ____ and _____ degrees

Answer 10

15-30 degrees

1310 p 5

Question 11

Range capability increases with peak power. Doubling peak power increases range capabilities by ____ percent

Answer 11

25 percent

1310 p. 24

Question 12

Greater detection range is generally obtained by which band of radar?

Answer 12

S band. Lower frequency (longer wavelength), less attenuation.

1310 p. 24

Question 13

How is detection range affected by slower radar rotation rates?

Answer 13

Greater detection range

1310 p.24

Question 14

What are the three principal factors that affect range resolution? (And how to best maximize this)

Answer 14

Pulse length (short)
Rx gain (low)
Range scale (short)

1310 p.26

Question 15

Bearing accuracy is improved with a narrower horizontal beam width. How can this be effectively changed?

Answer 15

By lowering rx gain.

1310 p.29

Question 16

In the event of a gyro failure, what setting should immediately be changed on the radar.

Answer 16

Switch to Heads-Up display.

MITAGS Emergency Shiphandling

Question 17

In true motion radar, which is generally preferred, sea-stabilization or ground-stabilization?

Answer 17

Sea stabilization

1310 p. 38