NAVEDTRA 14190A NEETS Mod. 18, Ch. 3 Flashcards Preview

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Flashcards in NAVEDTRA 14190A NEETS Mod. 18, Ch. 3 Deck (16):
1

What is the actual range of a target from the radar known as, whether on the ground, in the water, or in the air?

Slant range

2

What acts as the master timing device in analyzing the return of the video in a radar system?

Radar indicator

3

What ensure that the sweep on the repeater starts from its point of origin each time the radar transmits?

Trigger timing pulses

4

The three most common types of displays, called scopes, are the A-scope, the Range-Height Indicator (RHI) Scope, and which other type of scope?

Plan Position Indicator (PPI)

5

Which type of display presents only the range to the target and the relative strength of the echo?

A-scope

6

Which type of scope is used with height-finding search radars to obtain altitude information?

Range-Height Indicator (RHI)

7

Which type of scope is by far the most used radar display?

PPI

8

Which type of circuit converts mechanical bearing information from the antenna into voltages which control sweep circuit azimuth? 


Sweep control

9

Which two general classes do antennas fall into?

Omnidirectional and Directional

10

Which type of antennas radiate RF energy in all directions simultaneously?

Omnidirectional

11

Directional antennas radiate RF energy in which types of patterns that extend outward from the antenna in one direction for a given antenna position?

Lobes or Beams

12

Which antenna property refers to the degree of sharpness of its beam?

Directivity

13

Which antenna property is the ratio of its radiated power to that of a reference (basic) dipole?

Power gain

14

The simplest form of antenna for measuring azimuth (bearing) is a rotating antenna that produces which type of pattern? 



Single-lobe

15

What is the angle between the axis of the radar beam and the earth's surface known as?

Angle of elevation

16

What spreads out as it travels and produces a pattern that is neither too sharp nor too directive?

Spherical wavefront