Vol 4 UREs Flashcards Preview

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Flashcards in Vol 4 UREs Deck (52):
1

What is the status of the transmitter when the antenna is receiving radar return echoes and beacon signals?

Inactive

2

A phased-array antenna is limited to how many transmit and receive operations at any one time?

1

3

A synthetic aperture antenna needs an aircraft to move how far along a straight line to be coherent?

1 km

4

What kind of antenna is a synthetic aperture radar antenna?

Large linear array antenna

5

What is the frequency range of S-band?

2000-4000 MHz

6

What is the frequency range of X-band?

8000-12000 MHz

7

The local oscillator output frequency must be tunable over a range of several megahertz in what region?

4000 MHz

8

Range and direction, including both azimuth and elevation of an object is important for the accuracy of what process?

Location of an object in space by radar

9

What does the shape of a pulse not determine?

Range to the target

10

What does the duration of the radar pulse determine?

Minimum range of the radar set

11

Continuous wave radar cannot be used on airborne surveillance because of what associated problem?

Installing two antennas with adequate isolation

12

What is the advantage of a single ended (or unbalanced) crystal mixer?

Simplicity

13

The purpose of a mixer stage is to convert radio frequency (RF) energy to

Lower intermediate frequency

14

Which component of the Tactical Interface Gateway (TIG) enables beyond line of sight (BLOS) coverage?

SATCOM/GPS Antenna

15

Which component of the Tactical Information Gateway (TIG) system interface group provides all necessary connections between group components and the TIG set?

Multipurpose interface panel

16

What is the purpose of the Multifunctional Information Distribution System (MIDS) data terminal?

Provide line of sight connectivity to a local area network

17

To prevent interference and possible terminal shutdowns, what system does the Tactical Information Gateway (TIG) system monitor?

Identification friend or foe (IFF)

18

How does a digital computer perform mathematical computations?

Expressing number in terms of digits

19

When is it desirable to use an analog voltage in circuits for some digital equipment?

Physical condition, such as azimuth is represented

20

Which item is not an unwanted echo or clutter in a radar?

Enemy aircraft

21

What happens to a frequency as the pulse passes through the device dispersive delay line (DDL)?

Low frequencies are delayed longer than high frequencies

22

What action is the synchronizer (also known as the "timer" or "keyer") designed to perform?

Synchronize signals that time the transmitted pulses and the indicator

23

How is an oscillator used in the master timer type synchronizer?

Main timing reference for the radar

24

In the gps, how many hours must pass before almanac data is transferred to each satellite to update the navigation data message?

24

25

How many radio frequency signals are transmitted from each gps satellite?

Two

26

How does the gps navigation set calculate speed?

Measuring the rate of change of the radio frequency signal

27

The gps has a three-dimensional position navigation accuracy of

16 meters

28

The navigational system of the gps is time accurate to how many nanoseconds?

100

29

Which gps system feature does not make it ideal for military use?

Low-power transmitter

30

Which gps component is passive, meaning it does not require power, adjustments, or controls to function?

Antenna

31

Which gps unit provides a display for the ARN-151?

Indicator control

32

The purpose of the ARN-151 receiver unit is to

Process the intermediate frequency signal and calculate it into a navigation solution

33

To begin gps satellite tracking, what information must the operator first initialize?

Position, time, and almanac information

34

Which receiver interface provides communication in the binary-coded decimal format between the gps and HAVE-QUICK equipment?

Precise time and time interval (PTTI) interface

35

The gps interface that uses simplified computer words of specific high and low voltage levels is the

Aeronautical radio incorporated (ARINC) interface

36

Which gps LRU will "null out" (decrease) the unwanted signal by vector addition of all signal inputs?

Antenna controller

37

What establishes the network system time for a Link-16 system?

Network time reference (NTR)

38

How many hops per second does a Tactical Digital Information Link (TADIL) J perform to preclude jamming by a narrow band jammer?

77,000

39

Which network participation group is not divided into two components that are configured as a stacked net?

Electronic warfare

40

What are the kilobit per second (Kbps) data rates used in a stacked net of a Tactical Digital Information Link (TADIL) J voice channels?

2.4 or 16

41

What is the maximum number of units that can participate in a Link-16 net?

32766

42

Which field is on the Link-16 friendly status report?

Equipment status

43

What does the relative navigation (RELNAV) function of the Link-16 system determine?

Distance

44

The elapsed time indicator of the receiver-transmitter (RT) indicates the total time power has been

applied to the RT

45

Which subassembly is a part of the control monitor set (CMS)?

SDU load control unit (SLCU)

46

What is the power output of the High Power Amplifier Group (HPAG) in high power mode?

1050 watts

47

What power source is used to provide emergency back-up power to the Tactical Digital Information Link (TADIL) terminal to maintain critical data?

Nickel-cadmium batteries

48

Low pass filters pass signals in which range?

960-1215 MHz

49

What is the operating band used by Joint Tactical Information Distribution System (JTIDS)?

L

50

How many bits of data can be transmitted in a given timeslot of a Joint Tactical Information Distribution System (JTIDS)?

930

51

In coarse synchronization, how many receivers are used by the receiver-transmitter (RT)?

Eight

52

What are the two ways in which fine synchronization is accomplished?

Active and passive