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CDCs > Vol 4 UREs > Flashcards

Vol 4 UREs Flashcards

1
Q

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

A

Inactive

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2
Q

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

A

1

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3
Q

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

A

1 km

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4
Q

What kind of antenna is a synthetic aperture radar antenna?

A

Large linear array antenna

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5
Q

What is the frequency range of S-band?

A

2000-4000 MHz

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6
Q

What is the frequency range of X-band?

A

8000-12000 MHz

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7
Q

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

A

4000 MHz

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8
Q

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

A

Location of an object in space by radar

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9
Q

What does the shape of a pulse not determine?

A

Range to the target

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10
Q

What does the duration of the radar pulse determine?

A

Minimum range of the radar set

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11
Q

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

A

Installing two antennas with adequate isolation

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12
Q

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

A

Simplicity

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13
Q

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

A

Lower intermediate frequency

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14
Q

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

A

SATCOM/GPS Antenna

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15
Q

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

A

Multipurpose interface panel

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16
Q

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

A

Provide line of sight connectivity to a local area network

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17
Q

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

A

Identification friend or foe (IFF)

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18
Q

How does a digital computer perform mathematical computations?

A

Expressing number in terms of digits

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19
Q

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

A

Physical condition, such as azimuth is represented

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20
Q

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

A

Enemy aircraft

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21
Q

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

A

Low frequencies are delayed longer than high frequencies

22
Q

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

A

Synchronize signals that time the transmitted pulses and the indicator

23
Q

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

A

Main timing reference for the radar

24
Q

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

A

24

25
Q

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

A

Two

26
Q

How does the gps navigation set calculate speed?

A

Measuring the rate of change of the radio frequency signal

27
Q

The gps has a three-dimensional position navigation accuracy of

A

16 meters

28
Q

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

A

100

29
Q

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

A

Low-power transmitter

30
Q

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

A

Antenna

31
Q

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

A

Indicator control

32
Q

The purpose of the ARN-151 receiver unit is to

A

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

33
Q

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

A

Position, time, and almanac information

34
Q

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

A

Precise time and time interval (PTTI) interface

35
Q

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

A

Aeronautical radio incorporated (ARINC) interface

36
Q

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

A

Antenna controller

37
Q

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

A

Network time reference (NTR)

38
Q

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

A

77,000

39
Q

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

A

Electronic warfare

40
Q

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

A

2.4 or 16

41
Q

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

A

32766

42
Q

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

A

Equipment status

43
Q

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

A

Distance

44
Q

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

A

applied to the RT

45
Q

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

A

SDU load control unit (SLCU)

46
Q

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

A

1050 watts

47
Q

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

A

Nickel-cadmium batteries

48
Q

Low pass filters pass signals in which range?

A

960-1215 MHz

49
Q

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

A

L

50
Q

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

A

930

51
Q

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

A

Eight

52
Q

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

A

Active and passive

CDCs (9 decks)

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