Navy Adv IT SATELLITES AND ANTENNAS

24. What are the FLTSATCOM satellites longitudinal position?

100°W, 72.5°E, 23°W, and l 72°E.

27. What is the position of the CONUS LEASAT (L-3)?

105°W

30. How many communications channels do each LEASAT provide?

13

28. What is the position of the LANT LEASAT (L-1)?

15°W

75. What can the DAMA transmission rate on the satellite link be?

2,400, 9,600, 19,200, or 32,000 symbols per second

20. Within the 500-kHz band, transponders provide how many individual 25-kHz low- and high-data-rate communications channels for 75 band ship-shore communications?

20

25. What is the RF-channel capability of each FLTSATCOM satellite?

23

31. What is the frequency of one of the 7 UHF downlink channels used for the Fleet Satellite Broadcast?

24-kHz

7. What frequencies do the AN/SRR-1 antennas use to receive satellite fleet broadcasts?

240 to 315 MHz

5. What is the receiving frequency band of the OE-82C/WSC-l (V)?

248 to 272 MHz

51. What is the bandwidth of the AN/FSC-79?

7- to 8-GHz

29. What is the position of the 10 LEASAT (L-2)?

72.5°E

74. What can the baseband equipment input or output data rate with DAMA equipment be?

75, 300, 600, 1,200, 2,400, 4,800, or 16,000 bits per second (bps)

11. What is the antenna pointing guide?

A clear plastic overlay, which slides across a stationary map and indicates AZ and EL angles in degrees to the satellite

47. What does the radio group consist of?

A high power amplifier (HPA) or medium power amplifier (MPA), low noise amplifier (LNA), upconverter, down-converter, and frequency standard

45. What does a narrow uplink transmission beam width provide?

A low probability of intercept (LPI) capability

38. What does an active satellite act as?

A repeater

56. What are the two parts of the AN/ARC-143 UHF Transceiver?

A transceiver and a radio set control

78. What was developed to provide an uninterrupted flow of essential communications without violating HERO and EMCON restrictions?

AUTOCAT, SATCAT, and MIDDLEMAN

37. What are the two types of communications satellites?

Active and passive

34. What does the system configuration that supports Navy SHF SATCOM consist of?

An SHF RF terminal and supporting baseband equipment

39. What does a typical operational link involve?

An active satellite and two Earth terminals

36. What unit commands the antenna to search for tracking (beacon) signals from the satellite?

An antenna control unit

61. What subsystem is designed as a communications link for antisubmarine warfare (ASW) operations between shore stations and aircraft?

Antisubmarine Warfare Information Exchange Subsystem (ASWIXS)

10. Where must a satellite antenna be pointed to communicate?

At the satellite

99. Why do circularly polarized shipboard antennas frequently offer considerable signal improvements over vertically polarized antennas?

Because aircraft maneuvers cause cross-polarization effects

77. What are the radio frequencies (RFs) that are prohibited from use when HERO conditions and EMCON restrictions are set?

Below 30 MHz

93. What antenna is commonly used at shore installations?

Directional

85. What is the antenna said to be if the RF transmission line is attached to the base?

End-fed

22. What system will replace the GAPFILLER communications subsystem?

FLTSATCOM system

26. What is channel 1 of the 25-kHz channel of the FLTSATCOM satellite used for?

Fleet broadcast

69. What would a typical configuration on a large ship include?

Fleet broadcast, CUDIXS/NAVMACS, secure voice, OTCIXS, TADIXS, teleprinter and TACINTEL equipment

23. How many FLTSATCOM satellites are in service?

Four

6. How many AS-2815/SSR-1 antennas does the AN/SRR-1 receiver system consist of?

Four

17. What name did the Navy give to the leased satellites assets to distinguish the special management and control functions for communications on the UHF channels?

GAPFILLER

13. What are the three types of communications satellites in use by the U.S. Navy today?

GAPFILLER, Fleet Satellite Communication (FLTSATCOM), and Leased Satellite (LEASAT)

14. What orbit are the three satellites in?

Geosynchronous orbit

95. What is the reason a vertical antenna is used to receive vertically polarized waves, and a horizontal antenna is used to receive horizontally polarized waves?

If a single-wire antenna is used to extract energy from a passing radio wave, maximum signal pickup results when the antenna is placed physically in the same direction as the electric field component

41. An orbit is generally either elliptical or circular, what is its inclination referred to as?

Included, polar, or equatorial

1. What is the reason for the development of the satellite communication (SATCOM) system?

It satisfies many military communications requirements with reliable, high-capacity, secure, and cost effective telecommunications

12. How are the values obtained from the antenna pointing guide useful to the operator?

It sets up the antenna control unit of a satellite system

2. What facilities do satellites provide an alternative to?

Large fixed ground installations

15. In 1976, three satellites were placed into orbit over the Atlantic, Pacific, and Indian oceans, what were they called?

MARlSAT

86. What is the antenna said to be if the RF transmission line is connected at the center?

Mid-fed or center-fed

81. What publication can you find information on the FFN?

Mission Communications, NTP 11

71. What is a method of increasing the number of transmissions taking place in the radio spectrum per unit of time?

Multiplexing

59. What serves as an automated shipboard terminal for interfacing with CUDIXS (shore-based) and the Fleet Broadcast System?

NAVMACS

3. What antenna is used with the AN/WSC-3 transceiver and is designed primarily for shipboard installation?

OE-82C/WSC-l (V)

66. What subsystem is designed as a communications link for battle group tactical operations?

Officer in Tactical Command Information Exchange Subsystem (OTCIXS)

89. What type of antenna radiates and receives equally well in all directions, except off the ends?

Omnidirectional

91. What type of antenna is mostly used in naval communications?

Omnidirectional or unidirectional

88. What are the three terms used to describe the type of directional qualities associated with an antenna?

Omnidirectional, bidirectional, and unidirectional

4. Where is the OE-82C/WSC-l (V) antenna mounted?

On a pedestal

16. What were the three channels for military use the MARISAT satellites had?

One wideband 500-kHz channel, and two narrowband 25-kHz channels

32. What operation reinforced the requirement for and greatly accelerated the introduction of SHF SATCOM capability on aircraft carriers and amphibious flagships to satisfy minimum tactical command and control (C2), intelligence and warfighting communications requirements while improving Joint and NATO/Allied communications inoperability?

Operations Desert Shield/Desert Storm

92. What is an example of a unidirectional antenna?

Parabolic, or dish, antenna

94. What is a major consideration in the efficient transmission and reception of radio signals?

Polarization of a radio wave

33. Phase II of the U.S. Navy's SHF fielding plan, which commenced in FY 94, will replace what terminals on aircraft carriers with an AN/WSC-6(V)4 terminal?

QUICKSAT

83. What is the ability of an antenna to both transmit and receive electromagnetic energy known as?

Reciprocity

53. What mode of operation is the AN/WSC-3 in when it uplinks in the 292.2- to 311.6-MHz bandwidth and downlinks in the 248.5- to 270.1-MHz band?

SATCOM mode

8. What band do the newer satellite systems use?

SHF

60. The SSIXS provides a communications system to exchange message traffic between what two users?

SSBN and SSN submarines and shore stations

35. What type ships use the AN/WSC-6(V) l, with the MD-1030A(V) modem?

SURTASS ships equipped with a single antenna

63. What subsystem allows connection with wide-area voice networks ashore?

Secure voice subsystem

79. What participants is the Fleet Flash Net (FFN) composed of?

Senior operational staffs and designated subscribers

44. What is a particularly valuable technique for lessening the effects of enemy jamming?

Spread spectrum modulation

100. What is a term used in antenna tuning?

Standing wave ratio (SWR), also called voltage standing wave ratio (VSWR)

62. What subsystem is a direct communications link between command centers ashore and afloat and provides one-way transmission of data link communications?

Tactical Data Information Exchange Subsystem (TADIXS)

64. What subsystem is specifically designed for special intelligence communications?

Tactical Intelligence (TACINTEL) Subsystem

67. What subsystem is an expansion of the existing teleprinter transmission network?

Teleprinter Subsystem (ORESTES)

55. What transceiver is used for ASWIXS communications and is installed at VP Antisubmarine Warfare Operation Centers and aboard P-3C aircraft?

The AN/ARC-143 UHF Transceiver

50. What terminal interfaces the communications subsystems and the satellite and provides the SHF uplink for the FLTSATCOM system?

The AN/FSC-79 Fleet Broadcast Terminal

49. What is the Navy's standard SATCOM broadcast receiver system?

The AN/SSR-1

52. What is the standard UHF SATCOM transceiver for both submarine and surface ships?

The AN/WSC-3 Transceiver

54. What is the common UHF RF satellite terminal installed at NAVCOMTELSTAs for the GAPFILLER subsystem?

The AN/WSC-5 UHF Transceiver

65. What subsystem is a communications network that facilitates status reporting and management of FLTSATCOM system assets?

The Control Subsystem

58. What subsystem is an expansion of fleet broadcast transmissions that historically have been the central communications medium for operating naval units?

The Fleet Satellite Broadcast (FSB) subsystem

57. What system provides communications links, via satellite, between shore commands and mobile units?

The Fleet Satellite Communications (FLTSATCOM) system and subsystems

68. What subsystem is a joint operation between the U.S. Navy and contractors for controlling LEASATs?

The LEASAT Telemetry Tracking and Command Subsystem

48. What does the SATCOM equipment that the Navy uses for the fleet broadcast include?

The SATCOM broadcast receiver (AN/SSR-1), the FLTSATCOM SHF broadcast transmitter (AN/FSC-79), the standard shipboard transceiver (AN/WSC-3), the shore station transceiver (AN/WSC-5), and the basic airborne transceiver (AN/ARC-l43B)

46. What is a characteristic of SHF, favorable to flagships?

The ability to communicate critical C4I for the user information in the presence of enemy jamming and with due regard for enemy detection capabilities

43. What determines the complexity of the components and the manner in which the system operates?

The design of the overall system

84. What is the point on an antenna where the RF cable is attached?

The feed point

19. What GAPFILLER satellite is the only one still being used by the U.S. Navy?

The one over the Indian Ocean

82. What person can mean the difference between efficient and inefficient communications?

The operator

40. What does the basic design of a satellite communications system depend a great deal on?

The parameters of the satellite orbit

21. What does the UHF receiver separate on the GAPFILLER satellite?

The receive band and the transmit band

72. What does multiplexing involve?

The simultaneous transmission of a number of intelligible signals using only a single transmitting path

87. What does the directivity of an antenna refer to?

The width of the radiation beam pattern

9. What is the major advantage of the AN/SRR-1 receiver system?

They use a very small parabolic antenna measuring only 12 inches in diameter

76. What is circuit restoral dependent upon?

Timely action, quick decisions, and the ability of personnel to use any means available to restore communications in the shortest possible time

80. What is the purpose of the FFN?

To distribute high-precedence or highly sensitive traffic among subscribers

18. What was the intended purpose of the GAPFILLER satellite?

To fill the need for a continuing satellite communications capability in support of naval tactical operations until the Navy achieved a fully operable Fleet Satellite Communications (FLTSATCM) system

70. What is the purpose of Demand Assigned Multiple Access (DAMA)?

To multiplex several subsystems or users on one satellite channel

42. How many basic components make u11 a satellite communications system?

Two

73. The Navy uses how many multiplexing methods?

Two

90. What type of antenna radiates or receives efficiently in only one direction?

Unidirectional

98. What type of polarization do the VHF and UHF antennas used for ship-to-aircraft communications use?

Vertical and circular

97. What type of polarization are most shipboard communications antennas?

Vertically polarized

96. When antennas are close to the ground, do vertically polarized radio waves yield a stronger signal close to the Earth than those that are horizontally polarized?

Yes