Radio Extra Class MCQ Flashcards
7 cards from real HAM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Radio Extra Class MCQ flashcards as text
What is the maximum power output permitted for an amateur station transmitting on 60 meters (5 MHz) in the US?
Answer: 100 watts PEP ERP
FCC Part 97 limits amateur stations on 60 meters to 100 watts PEP effective radiated power (ERP) relative to a dipole.
Which ionospheric layer is primarily responsible for long-distance HF propagation during daylight hours?
Answer: F2 layer
The F2 layer, highest and most stable, is the primary reflector for long-distance HF signals during the day.
In a parallel RLC circuit at resonance, the circuit impedance is at its:
Answer: Maximum value
At resonance, a parallel RLC circuit exhibits maximum impedance because the inductive and capacitive currents cancel.
What does the term 'third-order intercept point' (IP3) indicate about an amplifier?
Answer: A measure of the amplifier's linearity and susceptibility to intermodulation distortion
IP3 is a theoretical point extrapolated from gain curves that indicates how well an amplifier handles strong signals without generating intermodulation products.
What type of emission is produced when a single-sideband suppressed-carrier signal is transmitted?
Answer: J3E
J3E designates single-sideband suppressed-carrier telephony per ITU emission designators.
A Yagi antenna's front-to-back ratio describes:
Answer: The difference in gain between the main forward lobe and rearward radiation
Front-to-back ratio is expressed in dB as the difference in signal strength between the forward direction and the 180-degree rear direction.
Which digital mode uses frequency-shift keying with 8 tones to achieve high throughput on HF?
Answer: PACTOR IV
PACTOR IV uses 8-tone DPSK modulation to achieve data rates up to 5,400 bits per second on HF bands.