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Amateur Radio Extra 2016-2020 > Outer Space Comms > Flashcards

Outer Space Comms Flashcards

1
Q

E1D02 What is the amateur satellite service?

A. A radio navigation service using satellites for the purpose of self training, intercommunication and technical studies carried out by amateurs.
B. A spacecraft launching service for amateur built satellites
C. A radio communication service using amateur radio stations on satellites
D. A radio communications service using stations on earth satellites for public service broadcast.

A

A. A radio navigation service using satellites for the purpose of self training, intercommunication and technical studies carried out by amateurs.

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2
Q

E2A02 What is the direction of a descending pass for an amateur satellite?

A. From north to south
B. From west to east
C. From east to west
D. From south to north?

A

A. From north to south

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3
Q

E2A01 What is the direction of an ascending pass for an amateur satellite?

A. From west to east
B. From east to west
C. From south to north
D. From north to south

A

C. From south to north

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4
Q

E1D06. Which of the following is a requirement of a space station?

A. The space station must be capable of terminating transmissions by telecommand when directed by the FCC
B. The space station must cease all transmissions after 5 years
C. The space station must. E capable of changing its orbit whenever such a change is ordered by NASA
D. All of these choices are correct

A

A. The space station must be capable of terminating transmissions by telecommand when directed by the FCC

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5
Q

E1D07. Which amateur service HF bands have frequencies authorized for space stations?

A. Only the 40 m,20 m , 17 m,15 m, 12 m and 10 m bands
B. Only the 40 m,20 m , 17 m,15 m, and 10 m bands
C. Only the 40 m, 30 m, 20 m ,15 m, 12 m and 10 m bands
D. All HF bands

A

A. Only the 40 m,20 m , 17 m,15 m, 12 m and 10 m bands

** think voice - only 30 m doesn’t allow voice

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6
Q

E2A13. What type of satellite appears to stay in one position in the sky?

A. HEO
B. Geostationary
C. Geomagnetic
D. LEO

A

B. Geostationary

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7
Q

E1D05. What class of licensee is authorized to be the control operator of a space station?

A. All except technician 
B. Only general, advanced, or extra
C. Any class with appropriate operator privileges
D. On extra class
A

C. Any class with appropriate operator privileges

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8
Q

E1D08. Which VHF amateur service bands have frequencies available for a space station?

A. 6 m and 2 m
B. 6 m, 2 m, 1.25. M
C. 2 m and 1.25 m
D. 2 m

A

D. 2 m

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9
Q

E3A01. What is the approximate maximum separation measured along the surface of the earth between two statins communicating by moon bounce?

A. 500 miles if the moon is at perigee
B. 2000 miles if the moon is apogee
C. 5000 miles if the moon is at perigee
D. 12000 miles if the moon is visible by Both stations

A

D. 12000 miles if the moon is visible by Both stations

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10
Q

E3A02. What characterizes libration fading of an EME signal?

A. A slow change in the pitch of the CW signal
B. A fluttery irregular fading
C. A gradual loss of signal as the sun rises
D. The returning echo is several hertz lower in frequency than the transmitted signal

A

B. A fluttery irregular fading

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11
Q

E3A03. When scheduling EME contacts, which of these conditions will generally result in the least path loss ?

A. When the moon is at perigee
B. When the moon is full
C. When the moon is at apogee
D. When the MUF is above 30 MHz

A

A. When the moon is at perigee

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12
Q

E2D06. Which of the following describes a method of establishing EME contacts?

A. Time synchronous transmissions alternately from each station
B. Storing and forwarding digital messages
C. Judging optimum transmission times by monitoring beacons reflected from the moon
D. High speed CW identification to avoid fading

A

A. Time synchronous transmissions alternately from each station

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13
Q

E2D03. Which of the following digital modes is especially useful for EME communications ?

A. FSK441
B. PACTOR III
C. Olivia
D. JT65

A

D. JT65

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14
Q

E2D13. What type of modulation is used for JT65 contacts?

A. Multi-tone AFSK
B. PSK
C. RTTY
D. IEEE 802.11

A

A. Multi-tone AFSK

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15
Q

E2E03. How is the timing of JT65 contacts organized ?

A. By exchanging ACK/NAK packets
B. Stations take turns on different day
C. Alternating transmissions at 1 minute intervals
D. It depends on the lunar phase

A

C. Alternating transmissions at 1 minute intervals

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16
Q

E2D14. What is one advantage if using JT65 coding ?

A. Uses only 65 Hz bandwidth
B. The ability to decode signals which have a very low signal to noise ratio
C. Easily copied by ear
D. Permits fast scan tv over a narrow bandwidth

A

B. The ability to decode signals which have a very low signal to noise ratio

17
Q

E2D12. How does JT65 improve EME communications ?

A. It can decode signals many dB below the noise floor using FEC
B. It controls the receiver to track Doppler shift
C. It supplies signals to guide the antenna to track the moo
D. All of these choices are correct

A

A. It can decode signals many dB below the noise floor using FEC

18
Q

E2A03 What is the orbital period of an Earth satellite?

A. The point of maximum height of a satellite’s orbit
B. The point of minimum height of a satellite’s orbit
C. The time it takes for a satellite to complete on revolution around the earth
D. The time it takes for a satellite to travel from perigee to apogee

A

. The time it takes for a satellite to complete on revolution around the earth

19
Q

E1D04 What is an earth station in the amateur satellite service?

A. An amateur station within 50 km of the earth’s surface intended for communications with amateur stations by means of objects in space.
B. An amateur station that is not able to communicate using amateur satellites
C. An amateur station that transmits telemetry consisting of measurement of upper atmosphere data
D. Any amateur station on the surface of the earth.

A

A. An amateur station within 50 km of the earth’s surface intended for communications with amateur stations by means of objects in space

20
Q

E1D11 Which amateur stations are eligible to operate as earth stations?

A.  Any amateur station who licensee has filed a pre-space notification with the FCC's International Bureau
B.  Only those of general advanced or amateur extra class
C.  Only those of amateur extra class operators
D.  Any amateur station, subject to the privileges of the class of operator license held by the control operator.
A

D. Any amateur station, subject to the privileges of the class of operator license held by the control operator

21
Q

E1D03 What is a telecommand station in the amateur satellite service?

A. An amateur station located on the earth’s surface for communication with other earth stations by means of earth satellites
B. An amateur station that transmits communications to initiate, modify or terminate functions of a space station
C. An amateur station located more than 50 km above the earth’s surface
D. An amateur station that transmits telemetry consisting of measurements of upper atmosphere data

A

B. An amateur station that transmits communications to initiate, modify or terminate functions of a space station

22
Q

E1D10 Which amateur stations are eligible to be telecommand stations?

A. any amateur station designated by NASA
B. Any amateur station so designated by the space station licensee, subject to the privileges of the class of operator license held by the control operator
C. Any amateur station so designated by the ITU
D. All of these choices are correct

A

B. Any amateur station so designated by the space station licensee, subject to the privileges of the class of operator license held by the control operator

23
Q

E1D01 What is the definition of the term telemetry?

A. One way transmission of measurements at a distance from the measuring instrument
B. Two way radiotelephone transmissions in excess of 1000 feet
C. Two way single channel transmissions of data
D. One way transmission that initiates, modifies, or terminates the functions of a device at a distance

A

A. One way transmission of measurements at a distance from the measuring instrument

24
Q

E2A04 What is meant by the term mode as applied to an amateur radio satellite?

A. The type of signals that can be relayed through the satellite
B. The satellite’s uplink and downlink frequencies
C. The satellite’s orientation with respect to the earth
D. Whether the satellite is in a polar or equatorial orbit

A

B. The satellite’s uplink and downlink frequencies

25
Q

E2A05 What do the letters in a satellite’s mode designator signify?

A. Power limits for uplink and downlink transmissions
B. The location of the ground control station
C. The polarization of uplink and downlink signals
D. The uplink and downlink frequency ranges

A

D. The uplink and downlink frequency ranges

26
Q

Ea209 What do the terms L band and S band specifiy with regard to satellite communications?

A. The 23 centimeter and 13 centimeter bands
B. The 2 meter and 70 meter bands
C. FM and Digital store and forward systems
D. Which sideband to use

A

A. The 23 centimeter and 13 centimeter bands

27
Q

E2A06 On what band would a satellite receive signals if it were operating in move U/V?

A. 435 MHz - 438 MHz
B. 144 MHz - 146 MHz
C. 50.0 MHz - 50.2 MHz
D. 29.5 MHz - 29.7 MHz

A

A. 435 MHz - 438 MHz

28
Q

E2A07 Which of the following types of signals can be relayed through a linear transponder?

A. FM and CW
B. SSB and SSTV
C. PSK and Packet
D. All of these choices are correct

A

D. All of these choices are correct

29
Q

E2A08 Why should effective radiated power to a satellite which uses a linear transponder by limited?

A. To prevent creating errors in the satellite telemetry
B. To avoid reducing the downlink power to all other users
C. To prevent the satellite from emitting out of band signals
D. To avoid interfering with terrestrial QSOs

A

B. To avoid reducing the downlink power to all other users

30
Q

E2A10 Why may the received signal from an amateur satellite exhibit a rapidly repeating fading effect?

A. Because the satellite is spinning
B. Because of ionospheric absorption
C. Because of the satellite’s low orbital altitude
D. Because of the Doppler Effect

A

A. Because the satellite is spinning

31
Q

E2A11 What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

A. A linearly polarized antenna
B. A circularly polarized antenna
C. An isotropic antenna
D. A log-periodic dipole array

A

B. A circularly polarized antenna

32
Q

E2A12 What is one way to predict the location of a satellite at a given time?

A. By means of the Doppler data for the specified satellite
B. By subtracting the mean anomaly from the orbital inclination
C. By adding the mean anomaly from the orbital inclination
D. By calculations using the Keplerian elements for the specified satellite

A

D. By calculations using the Keplerian elements for the specified satellite

33
Q

E2D04 What is the purpose of digital store and forward functions on an Amateur Radio satellite?

A. To upload operational software for the transponder
B. To delay download of telemetry between satellites
C. To store digital messages in the satellite fro later download by other stations
D. To relay messages between satellites

A

C. To store digital messages in the satellite fro later download by other stations

34
Q

E2D05 Which of the following techniques is normally used by low earth orbiting digital satellites to relay messages around the world?

A. Digipeating
B. Store and forward
C. Multi satellite relaying
D. Node hopping

A

B. Store and forward

Amateur Radio Extra 2016-2020 (5 decks)

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