ET VOL 3 CH 1,3 Flashcards Preview

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Flashcards in ET VOL 3 CH 1,3 Deck (64):
1

2

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

Radio

3

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

Electromagnetic

4

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

Terminal

5

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

Terminal

6

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

ELF, VLF, LF

7

Which of the following frequency bands has limited naval use?

MF

8

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

Microwave

9

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

Modulation

10

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

(A) amplitude. (B) frequency

11

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

Pulse

12

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

CW is slow

13

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

Phase-shift

14

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

True

15

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

Detection

16

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

Selectivity and fidelity

17

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

1 milliwatt

18

What is formula for DBM?

DBM =actual power/.001 watt

19

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

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

20

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

4

21

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

(X) 1 Thru 6 are transmitters

22

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

Synchro (light duty)

23

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

Passive

24

Which term refers to reception and retransmission?

Active

25

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

Atmospheric

26

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

Mobile

27

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

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

28

What purpose does CUDIXS/NAVMACS serve?

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

29

How many NCTAMS have primary responsibility for communications via satellite?

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

30

Subsystems consist of two parts. What are they?

Satellite; rf terminal

31

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

Shf (uplink) uhf (downlink)

32

What system do subscribers use to receive Fleet Satellite Broadcast?

SSR-1

33

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

4

34

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

25

35

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

Group broadcast

36

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

Narrowband (2400 bps)

37

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

Voice controller

38

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

TACINTEL

39

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

Receive only

40

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

OTCIXS

41

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?

Emission control (EMCON)

42

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

DAMA (demand assigned multiple access)

43

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

Frame

44

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

Link

45

What are all DAMA multiplexer transmit times referenced to?

The satellite

46

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

TD-1271B/U

47

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

Naval Computer and Telecommunications Command

48

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

10

49

How many FLTSATCOM satellites have ehf packages installed?

2

50

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

DAMA

51

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

UHF F/O

52

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

SHF (X-Band)

53

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

X-band

54

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

FM

55

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

AN/WSC-3

56

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

100 watts

57

What shipboard system is used to receive Fleet Satellite Broadcast?

SSR-1

58

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

OM-51A/FR

59

which processor is used in the TADIXS subsystem?

AN/UYK-44(V)

60

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

AN/UYK-20(V)

61

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

TACINTEL/NAVMACS

62

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

Secure voice

63

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

On top

64

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?

14