ET VOL 3 CH 1,3

Question 2

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

Answer 2

Radio

Question 3

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

Answer 3

Electromagnetic

Question 4

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

Answer 4

Terminal

Question 5

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

Answer 5

Terminal

Question 6

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

Answer 6

ELF, VLF, LF

Question 7

Which of the following frequency bands has limited naval use?

Answer 7

MF

Question 8

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

Answer 8

Microwave

Question 9

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

Answer 9

Modulation

Question 10

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

Answer 10

(A) amplitude. (B) frequency

Question 11

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

Answer 11

Pulse

Question 12

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

Answer 12

CW is slow

Question 13

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

Answer 13

Phase-shift

Question 14

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

Answer 14

True

Question 15

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

Answer 15

Detection

Question 16

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

Answer 16

Selectivity and fidelity

Question 17

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

Answer 17

1 milliwatt

Question 18

What is formula for DBM?

Answer 18

DBM =actual power/.001 watt

Question 19

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

Answer 19

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

Question 20

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

Answer 20

4

Question 21

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

Answer 21

(X) 1 Thru 6 are transmitters

Question 22

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

Answer 22

Synchro (light duty)

Question 23

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

Answer 23

Passive

Question 24

Which term refers to reception and retransmission?

Answer 24

Active

Question 25

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

Answer 25

Atmospheric

Question 26

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

Answer 26

Mobile

Question 27

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

Answer 27

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

Question 28

What purpose does CUDIXS/NAVMACS serve?

Answer 28

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

Question 29

How many NCTAMS have primary responsibility for communications via satellite?

Answer 29

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

Question 30

Subsystems consist of two parts. What are they?

Answer 30

Satellite; rf terminal

Question 31

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

Answer 31

Shf (uplink) uhf (downlink)

Question 32

What system do subscribers use to receive Fleet Satellite Broadcast?

Answer 32

SSR-1

Question 33

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

Answer 33

4

Question 34

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

Answer 34

25

Question 35

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

Answer 35

Group broadcast

Question 36

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

Answer 36

Narrowband (2400 bps)

Question 37

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

Answer 37

Voice controller

Question 38

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

Answer 38

TACINTEL

Question 39

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

Answer 39

Receive only

Question 40

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

Answer 40

OTCIXS

Question 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?

Answer 41

Emission control (EMCON)

Question 42

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

Answer 42

DAMA (demand assigned multiple access)

Question 43

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

Answer 43

Frame

Question 44

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

Answer 44

Link

Question 45

What are all DAMA multiplexer transmit times referenced to?

Answer 45

The satellite

Question 46

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

Answer 46

TD-1271B/U

Question 47

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

Answer 47

Naval Computer and Telecommunications Command

Question 48

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

Answer 48

10

Question 49

How many FLTSATCOM satellites have ehf packages installed?

Answer 49

2

Question 50

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

Answer 50

DAMA

Question 51

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

Answer 51

UHF F/O

Question 52

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

Answer 52

SHF (X-Band)

Question 53

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

Answer 53

X-band

Question 54

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

Answer 54

FM

Question 55

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

Answer 55

AN/WSC-3

Question 56

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

Answer 56

100 watts

Question 57

What shipboard system is used to receive Fleet Satellite Broadcast?

Answer 57

SSR-1

Question 58

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

Answer 58

OM-51A/FR

Question 59

which processor is used in the TADIXS subsystem?

Answer 59

AN/UYK-44(V)

Question 60

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

Answer 60

AN/UYK-20(V)

Question 61

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

Answer 61

TACINTEL/NAVMACS

Question 62

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

Answer 62

Secure voice

Question 63

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

Answer 63

On top

Question 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?

Answer 64

14