Amateur radio in space: amateur satellites; orbital mechanics; frequencies and modes; satellite hardware; satellite operations
E2A01
What is the direction of an ascending pass for an amateur satellite?
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A
From west to east
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B
From east to west
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C
From south to north
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D
From north to south
E2A02
Which of the following is characteristic of an inverting linear transponder?
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A
Doppler shift is reduced because the uplink and downlink shifts are in opposite directions
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B
Signal position in the band is reversed
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C
Upper sideband on the uplink becomes lower sideband on the downlink, and vice versa
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D
All these choices are correct
E2A03
How is an upload signal processed by an inverting linear transponder?
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A
The signal is detected and remodulated on the reverse sideband
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B
The signal is passed through a nonlinear filter
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C
The signal is reduced to I and Q components, and the Q component is filtered out
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D
The signal is mixed with a local oscillator signal and the difference product is transmitted
E2A04
What is meant by the "mode" of an amateur radio satellite?
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A
Whether the satellite is in a low earth or geostationary orbit
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B
The satellite's uplink and downlink frequency bands
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C
The satellite's orientation with respect to the Earth
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D
Whether the satellite is in a polar or equatorial orbit
E2A05
What do the letters in a satellite's mode designator specify?
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A
Power limits for uplink and downlink transmissions
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B
The location of the ground control station
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C
The polarization of uplink and downlink signals
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D
The uplink and downlink frequency ranges
E2A06
What are Keplerian elements?
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A
Parameters that define the orbit of a satellite
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B
Phase reversing elements in a Yagi antenna
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C
High-emission heater filaments used in magnetron tubes
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D
Encrypting codes used for spread spectrum modulation
E2A07
Which of the following types of signals can be relayed through a linear transponder?
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A
FM and CW
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B
SSB and SSTV
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C
PSK and packet
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D
All these choices are correct
E2A08
Why should effective radiated power (ERP) be limited to a satellite that uses a linear transponder?
-
A
To prevent creating errors in the satellite telemetry
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B
To avoid reducing the downlink power to all other users
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C
To prevent the satellite from emitting out-of-band signals
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D
To avoid interfering with terrestrial QSOs
E2A09
What do the terms "L band" and "S band" specify?
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A
The 23- and 13-centimeter bands
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B
The 2-meter and 70-centimeter bands
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C
FM and digital store-and-forward systems
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D
Which sideband to use
E2A10
What type of satellite appears to stay in one position in the sky?
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A
HEO
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B
Geostationary
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C
Geomagnetic
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D
LEO
E2A11
What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?
-
A
A linearly polarized antenna
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B
A circularly polarized antenna
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C
An isotropic antenna
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D
A log-periodic dipole array
E2A12
What is the purpose of digital store-and-forward functions on an amateur radio satellite?
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A
To upload operational software for the transponder
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B
To delay download of telemetry between satellites
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C
To hold digital messages in the satellite for later download
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D
To relay messages between satellites