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2015 > ET VOL 3 CH 1,3 > Flashcards

ET VOL 3 CH 1,3 Flashcards

1
Q
A
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2
Q

What type of equipment is used to coordinate the activities of fleet units by linking them with each other and shore stations?

A

Radio

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3
Q

Radio is the transmission and reception of electronic impulses or signals through space by means of what type of waves?

A

Electromagnetic

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4
Q

AN/UCC-1, AN/URA-17, and CV-2460 are examples of what type of shipboard equipment?

A

Terminal

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5
Q

___________ equipment is used primarily where coded transmissions are employed, to convert the modulated signal into the original intelligence.

A

Terminal

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6
Q

For efficient transmission, which of the following frequency bands require(s) high power and long antennas?

A

ELF, VLF, LF

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7
Q

Which of the following frequency bands has limited naval use?

A

MF

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8
Q

The super-high-frequency band is used extensively in what of communications?

A

Microwave

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9
Q

The emission class of an rf transmitter is based on what characteristic?

A

Modulation

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10
Q

An FM signal should remain constant in (a) what characteristic and change only in (b) what characteristic?

A

(A) amplitude. (B) frequency

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11
Q

What type of modulation is especially suited for use in time-division multiplexing?

A

Pulse

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12
Q

For modern communication needs, CW is not a preferred method. Why is this true?

A

CW is slow

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13
Q

In an FM transmitter, the audio signal shifts the carrier frequency in what network?

A

Phase-shift

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14
Q

In a ssb transmitter the carrier is removed to concentrate the power in the sideband(s) .

A

True

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15
Q

Which of the four receiver functions involves extraction of the modulation from the rf signal?

A

Detection

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16
Q

Which of the four receiver characteristics require compromise because of bandpass requirements ?

A

Selectivity and fidelity

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17
Q

The term “dBm” is based on what standard reference level?

A

1 milliwatt

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18
Q

What is formula for DBM?

A

DBM =actual power/.001 watt

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19
Q

Normal power out is 100 watts. During PMS, you discover that power out has dropped by 3dB. What is the new power out?

A

50 watt (3 db =50% of power) loss or gain)

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20
Q

How many radio set controls can be paralleled to one transmitter/ receiver group?

A

4

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21
Q

To transfer control of switched circuits to another transmitter or receiver switchboard, you should use what switch position?

A

(X) 1 Thru 6 are transmitters

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22
Q

Which of the following terms is used for a machine that operates as a single-phase transformer?

A

Synchro (light duty)

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23
Q

Of the two terms listed below, which one refers to reflection of radio signals back to earth by a satellite?

A

Passive

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24
Q

Which term refers to reception and retransmission?

A

Active

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25
Q

SATCOM links are only slightly affected by what phenomena associated with hf propagation difficulties?

A

Atmospheric

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26
Q

Trained crews can set up what type of satellite earth terminals within hours to establish communications in remote areas?

A

Mobile

27
Q

factors, which, if any factors, limit the use of a satellite communications system?

A
  1. Orbital parameters and technical characteristics 2. Transmitter power and receiver sensitivity
28
Q

What purpose does CUDIXS/NAVMACS serve?

A

Provides a communications network for transmitting general-service message traffic between ships and shore installations

29
Q

How many NCTAMS have primary responsibility for communications via satellite?

A

4 LANT Norfolk MED Naples WESTPAC finegayam Guam East PAC wahiam hi

30
Q

Subsystems consist of two parts. What are they?

A

Satellite; rf terminal

31
Q

In modes 1 through 6, what are the uplink and downlink frequency bands used in Fleet Satellite Broadcast?

A

Shf (uplink) uhf (downlink)

32
Q

What system do subscribers use to receive Fleet Satellite Broadcast?

A

SSR-1

33
Q

What is the minimum number of broadcast channels that NAVMACS guards automatically?

A

4

34
Q

What is the bandwidth (in kHz) of the satellite channels allocated to CUDIXS/NAVMACS?

A

25

35
Q

What term is associated with a submarine commander’s ability to receive messages via satellite at scheduled intervals?

A

Group broadcast

36
Q

Secure voice uses digitized voice with a 3-kHz voice channel. What type of voice modulation does this describe?

A

Narrowband (2400 bps)

37
Q

When using Secure Voice, a ship must contact what authority before initiating communications with a shore command?

A

Voice controller

38
Q

Which of the following is a subsystem specifically designed for special intelligence communications?

A

TACINTEL

39
Q

TADIXS-equipped surface ships and submarines operate in what mode(s)?

A

Receive only

40
Q

What subsystem is used in conjunction with TADIXS to transmit OTH-T data from the fleet to other ships and shore commands?

A

OTCIXS

41
Q

Because the reception of TADIXS information by a ship does not require an acknowledgement, the ship can l operate in what type of environment and still receive message traffic?

A

Emission control (EMCON)

42
Q

What system was developed to multiplex several users on one 25-kHz satellite channel?

A

DAMA (demand assigned multiple access)

43
Q

What term is used to describe how the Demand Assigned Multiple Access data stream is formatted?

A

Frame

44
Q

In the DAMA multiplexed data stream, which slot is used to test for communications error?

A

Link

45
Q

What are all DAMA multiplexer transmit times referenced to?

A

The satellite

46
Q

Which of the following equipments is used as the DAMA multiplexer?

A

TD-1271B/U

47
Q

Who performs day-to-day control and operation of naval satellite communications assets?

A

Naval Computer and Telecommunications Command

48
Q

Of the 23 uhf communications channels each FLTSATCOM satellite has, how many one dedicated to Navy use?

A

10

49
Q

How many FLTSATCOM satellites have ehf packages installed?

A

2

50
Q

LEASAT satellites have fewer 25-kHz channels than FLTSATs. What ground-based system do they use to maintain communications efficiency?

A

DAMA

51
Q

What is the replacement satellite for GAPFILLER, FLTSATCOM, and LEASAT?

A

UHF F/O

52
Q

The AN/FSC-79 satellite communications terminal transmits on what band?

A

SHF (X-Band)

53
Q

Which of the following is another term used to describe the shf communications band?

A

X-band

54
Q

The AN/WSC-5(V) uhf transceiver is capable of using differentially encoded phase-shift-keying and what other type of modulation?

A

FM

55
Q

Which of the following radios is the primary shipboard los and satellite transceiver?

A

AN/WSC-3

56
Q

The AN/WSC-3 transceiver has two rf output levels. One of these is 30 watts. What is the other rf output level?

A

100 watts

57
Q

What shipboard system is used to receive Fleet Satellite Broadcast?

A

SSR-1

58
Q

Which of the following is a spread spectrum type modem and is used with the AN/FSC-79 satellite communications terminal?

A

OM-51A/FR

59
Q

which processor is used in the TADIXS subsystem?

A

AN/UYK-44(V)

60
Q

which processor is used in the OTCIXS, NAVMACS ssixi , tacintel, subsystem?

A

AN/UYK-20(V)

61
Q

The AN/USQ-69(V) data terminal set is currently used with what two subsystems?

A

TACINTEL/NAVMACS

62
Q

Audio digital converter CV-3333/U is used primarily as an analog-to-digital converter for what type of communica-tions?

A

Secure voice

63
Q

Where are the system interface connectors installed on the Electrical Equipment Rack CY-7597/WSC-3?

A

On top

64
Q

DAMA-equipped shore installations use the OK-481(V)2/FSC Control Monitor Group to interface TD-1271B/Us, AN/WSC-5(V)s, and baseband equipment. It can accommodate up to how many TD-1271B/Us?

A

14

2015 (12 decks)

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