Vol 4 UREs

Question 1

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

Answer 1

Inactive

Question 2

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

Answer 2

1

Question 3

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

Answer 3

1 km

Question 4

What kind of antenna is a synthetic aperture radar antenna?

Answer 4

Large linear array antenna

Question 5

What is the frequency range of S-band?

Answer 5

2000-4000 MHz

Question 6

What is the frequency range of X-band?

Answer 6

8000-12000 MHz

Question 7

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

Answer 7

4000 MHz

Question 8

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

Answer 8

Location of an object in space by radar

Question 9

What does the shape of a pulse not determine?

Answer 9

Range to the target

Question 10

What does the duration of the radar pulse determine?

Answer 10

Minimum range of the radar set

Question 11

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

Answer 11

Installing two antennas with adequate isolation

Question 12

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

Answer 12

Simplicity

Question 13

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

Answer 13

Lower intermediate frequency

Question 14

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

Answer 14

SATCOM/GPS Antenna

Question 15

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

Answer 15

Multipurpose interface panel

Question 16

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

Answer 16

Provide line of sight connectivity to a local area network

Question 17

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

Answer 17

Identification friend or foe (IFF)

Question 18

How does a digital computer perform mathematical computations?

Answer 18

Expressing number in terms of digits

Question 19

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

Answer 19

Physical condition, such as azimuth is represented

Question 20

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

Answer 20

Enemy aircraft

Question 21

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

Answer 21

Low frequencies are delayed longer than high frequencies

Question 22

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

Answer 22

Synchronize signals that time the transmitted pulses and the indicator

Question 23

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

Answer 23

Main timing reference for the radar

Question 24

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

Answer 24

24

Question 25

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

Answer 25

Two

Question 26

How does the gps navigation set calculate speed?

Answer 26

Measuring the rate of change of the radio frequency signal

Question 27

The gps has a three-dimensional position navigation accuracy of

Answer 27

16 meters

Question 28

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

Answer 28

100

Question 29

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

Answer 29

Low-power transmitter

Question 30

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

Answer 30

Antenna

Question 31

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

Answer 31

Indicator control

Question 32

The purpose of the ARN-151 receiver unit is to

Answer 32

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

Question 33

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

Answer 33

Position, time, and almanac information

Question 34

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

Answer 34

Precise time and time interval (PTTI) interface

Question 35

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

Answer 35

Aeronautical radio incorporated (ARINC) interface

Question 36

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

Answer 36

Antenna controller

Question 37

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

Answer 37

Network time reference (NTR)

Question 38

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

Answer 38

77,000

Question 39

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

Answer 39

Electronic warfare

Question 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?

Answer 40

2.4 or 16

Question 41

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

Answer 41

32766

Question 42

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

Answer 42

Equipment status

Question 43

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

Answer 43

Distance

Question 44

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

Answer 44

applied to the RT

Question 45

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

Answer 45

SDU load control unit (SLCU)

Question 46

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

Answer 46

1050 watts

Question 47

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

Answer 47

Nickel-cadmium batteries

Question 48

Low pass filters pass signals in which range?

Answer 48

960-1215 MHz

Question 49

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

Answer 49

L

Question 50

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

Answer 50

930

Question 51

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

Answer 51

Eight

Question 52

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

Answer 52

Active and passive