HF operating privileges, propagation, and advanced radio theory for the FCC General class amateur radio license, based on the public-domain question pool.
44 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the frequency range for the 20 meter HF band?
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14.000 to 14.350 MHz- What is the frequency range for the 40 meter HF band?
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7.000 to 7.300 MHz- What is the frequency range for the 80 meter HF band?
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3.500 to 4.000 MHz- What is the frequency range for the 10 meter HF band?
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28.000 to 29.700 MHz- What is the frequency range for the 15 meter HF band?
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21.000 to 21.450 MHz- What maximum power can a General class licensee use on 20 meters phone?
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1500 watts PEP- What is the ionospheric layer primarily responsible for daytime HF propagation?
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The F2 layer- What is skip distance?
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The distance from a transmitter to the point where its signal first returns to Earth after ionospheric reflection- What is Maximum Usable Frequency (MUF)?
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The highest frequency that can be used for a given path between two points via ionospheric reflection- What effect does the sunspot cycle have on HF propagation?
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More sunspots increase ionospheric ionization, improving propagation on higher HF bands- What is fading in radio propagation?
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Variations in received signal strength due to multiple signal paths with different propagation delays- What is Standing Wave Ratio (SWR)?
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The ratio of maximum to minimum voltage in a standing wave on a transmission line- What does a 1:1 SWR indicate?
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Perfect impedance match between the transmitter, transmission line, and antenna- What is the characteristic impedance of most coaxial cables used in amateur radio?
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50 ohms- What antenna type is a half-wave dipole?
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A linear antenna equal in length to half a wavelength at the operating frequency
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