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?
- 14.000 to 14.350 MHz
- What is the frequency range for the 40 meter HF band?
- 7.000 to 7.300 MHz
- What is the frequency range for the 80 meter HF band?
- 3.500 to 4.000 MHz
- What is the frequency range for the 10 meter HF band?
- 28.000 to 29.700 MHz
- What is the frequency range for the 15 meter HF band?
- 21.000 to 21.450 MHz
- What maximum power can a General class licensee use on 20 meters phone?
- 1500 watts PEP
- What is the ionospheric layer primarily responsible for daytime HF propagation?
- The F2 layer
- What is skip distance?
- The distance from a transmitter to the point where its signal first returns to Earth after ionospheric reflection
- What is Maximum Usable Frequency (MUF)?
- 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?
- More sunspots increase ionospheric ionization, improving propagation on higher HF bands
- What is fading in radio propagation?
- Variations in received signal strength due to multiple signal paths with different propagation delays
- What is Standing Wave Ratio (SWR)?
- The ratio of maximum to minimum voltage in a standing wave on a transmission line
- What does a 1:1 SWR indicate?
- Perfect impedance match between the transmitter, transmission line, and antenna
- What is the characteristic impedance of most coaxial cables used in amateur radio?
- 50 ohms
- What antenna type is a half-wave dipole?
- A linear antenna equal in length to half a wavelength at the operating frequency