Vol3 CDC 3D153 Ure3

28 Questions | By Jayhuiz23 | Last updated: Mar 21, 2022 | Total Attempts: 159

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This is to be used as a study aid for RF transmission CDC's 3D153.

Questions and Answers

1.

(413) What comprises a telemetry data stream?
- A.
  
  Mission data and mission satellite health and status data.
- B.
  
  Command data and mission satellite health and status data.
- C.
  
  Mission data, satellite ephemeris table, and satellite status data
- D.
  
  Command data, satellite ephemeris table, and satellite status data.
2.

(413) On a satellite, position and orientation control is especially critical for what type of antenna?
- A.
  
  Broadband.
- B.
  
  Wide angle
- C.
  
  High Frequency
- D.
  
  Highly directional
3.

(414) The function of the command and control (C2) segment of the space systems is to?
- A.
  
  Provide downlink information and recover the payload and health and status data.
- B.
  
  Maintain the satellite health and status and recover the payload and health and status data.
- C.
  
  Provide downlink information and recover the payload and the area of coverage required by the program mission.
- D.
  
  Maintain the satellite health and status and recover the payload and the area of coverage required by the program mission.
4.

(414) What type of command is sent to the satellite by the space systems mission control complex and contains embedded timing that specifies the time the satellite will execute the command?
- A.
  
  Real-time
- B.
  
  Time-delayed
- C.
  
  Timed program
- D.
  
  Stored program
5.

(415) What is the purpose of the space system user segment?
- A.
  
  Receive, process, use, or distribute mission data as required by a program’s taskings.
- B.
  
  Receive, process, use, or distribute payload data and provide essential space support tasks as required by a program’s tasking
- C.
  
  Transmit, process, use, or distribute mission data as required by a program’s tasking
- D.
  
  Transmit, process, use, or distribute payload data and provide essential space support tasks as required by a program’s tasking
6.

(415) The two major subdivisions of the Defense Meteorological Satellite Program user segment are?
- A.
  
  Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals.
- B.
  
  Air Force Weather Agency and Fleet Numerical Meteorology Oceanography Center only
- C.
  
  Air Force Weather Agency and National Oceanographic Atmospheric Administration
- D.
  
  Fleet Numerical Meteorology Oceanography Center and National Oceanographic Atmospheric Administration and tactical terminals
7.

(415) Which early warning center receives Defense Support Program warning data from the 460th Space Wing units?
- A.
  
  Air Force Weather Agency.
- B.
  
  Mission Control Squadron.
- C.
  
  Mission Control Command.
- D.
  
  North American Aerospace Defense Command.
8.

(415) For an operational mission, the purpose of the global positioning system user segment is to enable users to?
- A.
  
  Actively receive satellite broadcast position, velocity, and time data
- B.
  
  Actively transmit satellite broadcast position, velocity, and time data.
- C.
  
  Passively receive satellite broadcast position, velocity, and time data.
- D.
  
  Passively transmit satellite broadcast position, velocity, and time data.
9.

(415) What system supports the National Command Authority and provides all-service (Army, Navy and Air Force) communication for interoperable command, control and communications (C3) at all levels of conflict?
- A.
  
  Defense Satellite Communications System
- B.
  
  Global Positioning System.
- C.
  
  Defense Support Program.
- D.
  
  Milstar
10.

(416) What sequence of events you must follow when establishing a communication link with a satellite?
- A.
  
  Frequency acquisition, space acquisition, antenna pointing, and satellite tracking
- B.
  
  Satellite acquisition, satellite tracking, power correction, and antenna pointing.
- C.
  
  Orbit prediction, antenna pointing, satellite acquisition, and satellite tracking.
- D.
  
  Orbit prediction, space acquisition, and frequency acquisition.
11.

(416) Telemetry refers to?
- A.
  
  A low power signal transmitted from the satellite and is separate from the communications components.
- B.
  
  A low power signal transmitted from the satellite and is part of the communications components.
- C.
  
  The data transmitted by the satellite concerning on-board status and is separate from the communications components.
- D.
  
  The data transmitted by the satellite concerning on-board status and is part of the communications components.
12.

(416) Information contained in the ephemeris data pertain to the?
- A.
  
  Predicted satellite orbit.
- B.
  
  Predicted atmospheric conditions.
- C.
  
  Channels through a satellite that are available for use.
- D.
  
  Combinations of ground stations that can communicate with each other.
13.

(416) Which tracking method requires no input from a satellite?
- A.
  
  Programmed track.
- B.
  
  Automatic track.
- C.
  
  Pseudoconscan.
- D.
  
  Step track.
14.

(416) Automatic tracking systems are superior to programmed tracking systems because they?
- A.
  
  Use servomechanisms to control antenna movements.
- B.
  
  Track only signals received from the satellite.
- C.
  
  Track the actual position of the satellite.
- D.
  
  Use updated ephemeris data.
15.

(416) What signals originating from the satellite do we use to acquire and track the satellite?
- A.
  
  Beacon.
- B.
  
  Ephemeris
- C.
  
  Telemetry.
- D.
  
  Communication.
16.

(417) The intermediate frequencies/levels used by Defense Satellite Communications System (DSCS) earth terminals are 70 MHz at
- A.
  
  –10 dBm and 630 MHz @ –13 dBm
- B.
  
  –13 dBm and 630 MHz @ –10 dBm.
- C.
  
  -10 dBm and 700 MHz @ –13 dBm.
- D.
  
  –13 dBm and 700 MHz @ –10 dBm.
17.

(417) How are the high power amplifiers (HPA) cooled in an AN/GSC–52 earth terminal?
- A.
  
  Air
- B.
  
  Cryogenic
- C.
  
  Liquid Nitrogen
- D.
  
  Ethanol/glycol solution.
18.

(417) The downlink frequency range of the Defense Satellite Communications System (DSCS) is
- A.
  
  7.25 to 7.75 MHz.
- B.
  
  7.25 to 7.75 GHz.
- C.
  
  7.9 to 8.4 MHz.
- D.
  
  7.9 to 8.4 GHz.
19.

(417) In the AN/GSC–52 earth terminal, the downconverter normally dedicated for tracking is downconverter?
- A.
  
  1 in Downconverter Rack 1.
- B.
  
  8 in Downconverter Rack 1.
- C.
  
  1 in Downconverter Rack 7.
- D.
  
  8 in Downconverter Rack 7.
20.

What information is used for satellite tracking on an AN/GSC–52 earth terminal operating in the memory track mode?
- A.
  
  Beacon signal.
- B.
  
  Recorded data.
- C.
  
  Ephemerous data.
- D.
  
  Communications signal.
21.

(417) Which of the following component is not used to control the AN/GSC–52 earth terminal?
- A.
  
  Remote terminal processor (RTP).
- B.
  
  External control element.
- C.
  
  Internal control element.
- D.
  
  Terminal processor (TP).
22.

(418) Which feedhorns are located in the AN/GSC–52 earth terminal feed assembly?
- A.
  
  Single tracking and communication feedhorn
- B.
  
  One tracking feedhorn and one communications feedhorn
- C.
  
  One tracking feedhorn and four communications feedhorns
- D.
  
  Four tracking feedhorns and one communication feedhorn.
23.

(418) In the AN/GSC–52 earth terminal’s tracking system, what converts the azimuth/elevation (AZ/EL) velocity commands from the antenna control unit into drive power outputs to move the antenna?
- A.
  
  Scanner.
- B.
  
  Comparator.
- C.
  
  Servo amplifier.
- D.
  
  Optical converter.
24.

(418) How are the high power amplifiers normally configured in the AN/GSC–52 earth terminal?
- A.
  
  One active online with three in standby mode.
- B.
  
  Two active online with two in standby mode.
- C.
  
  Three active online with one in standby mode.
- D.
  
  Four active online with none in standby mode.
25.

(418) In the event of a downconverter failure in the AN/GSC–52 earth terminal, the downconverter?
- A.
  
  Switch assembly (under TS-A control) automatically places a spare online.
- B.
  
  Alarm monitor (under TS-A control) automatically places a spare online.
- C.
  
  Controller (under TS-A control) automatically places a spare online.
- D.
  
  Spare must be configured and placed online manually.

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