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The flashcards below were created by user
mario.flores
on FreezingBlue Flashcards.
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What is the name for the distance a radio wave travels during one complete cycle?
Wavelength
Page 2-4
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How fast does a radio wave travel through free space?
At the speed of light
Page 2-4
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How does the wavelength of a radio wave relate to its frequency?
The wavelength gets shorter as the frequency increases
Page 2-5
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What is the formula for converting frequency to wavelength in meters?
Wavelength in meters equals 300 divided by frequency in megahertz
Page 2-5
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What property of radio waves is often used to identify the different frequency bands?
The approximate wavelength
Page 2-5
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What are the frequency limits of the VHF spectrum?
30 to 300 MHz
Page 2-3
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What are the frequency limits of the UHF spectrum?
300 to 3000 MHz
Page 2-3
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What frequency range is referred to as HF?
3 to 30 MHz
Page 2-3
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What is the approximate velocity of a radio wave as it travels through free space?
300,000,000 meters per second
Page 2-4
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How many milliamperes is 1.5 amperes?
1,500 milliamperes
Page 2-2
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What is another way to specify a radio signal frequency of 1,500,000 hertz?
1500 kHz
Page 2-2
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How many volts are equal to one kilovolt?
One thousand volts
Page 2-2
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How many volts are equal to one microvolt?
One one-millionth of a volt
Page 2-2
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Which of the following is equivalent to 500 milliwatts?
0.5 watts
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If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?
3 amperes
Page 2-2
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If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it showif it were calibrated in kilohertz?
3525 kHz
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How many microfarads are 1,000,000 picofarads?
1 microfarad
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What is the unit of frequency?
Hertz
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What is the abbreviation that refers to radio frequency signals of all types?
RF
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Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?
A. To allow for calibration error in the transmitter frequency display
B. To allow for transmitter frequency drift
C. All of these choices are correct
D. So that modulation sidebands do not extend beyond the band edge
C. All of these choices are correct
Page 2-9 [97.101(a)] (this multiple choice question has been scrambled)
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What determines the amount of deviation of an FM signal?
The amplitude of the modulating signal
Page 2-9
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What happens when the deviation of an FM transmitter is increased?
Its signal occupies more bandwidth
Page 2-9
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Which of the following is a form of amplitude modulation?
Single sideband
Page 2-8
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What type of modulation is most commonly used for VHF packet radio transmissions?
FM
Page 2-10
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Which type of voice modulation is most often used for long-distance or weak signal contacts on the VHF and UHF bands?
SSB
Page 2-10
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Which type of modulation is most commonly used for VHF and UHF voice repeaters?
FM
Page 2-10
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Which of the following types of emission has the narrowest bandwidth?
CW
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Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?
Upper sideband
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What is the primary advantage of single sideband over FM for voice transmissions?
SSB signals have narrower bandwidth
Page 2-10
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What is the approximate bandwidth of a single sideband voice signal?
3 kHz
Page 2-10
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