FREE Ham Radio Extra Class General Questions and Answers Flashcards
6 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 6 FREE Ham Radio Extra Class General Questions and Answers flashcards as text
What is the approximate noise figure of a well-designed preamplifier used for weak-signal VHF work?
Answer: 0.5 dB
A high-quality VHF preamplifier for weak-signal work typically achieves a noise figure of about 0.5 dB or less.
Which type of filter has the steepest skirt selectivity for a given number of poles?
Answer: Chebyshev
Chebyshev filters provide the steepest rolloff for a given filter order, at the expense of passband ripple.
What is the purpose of interleaving in digital communication modes used by amateur operators?
Answer: To spread burst errors across multiple data blocks so error correction can recover the data
Interleaving redistributes data so that burst errors affect different code blocks, allowing forward error correction to recover the original data.
What is the third-order intercept point (IP3) of a receiver used to measure?
Answer: The receiver's ability to handle strong signals without generating intermodulation distortion
The third-order intercept point indicates how well a receiver resists producing intermodulation products from strong nearby signals.
Under FCC Part 97, what is the maximum transmitter power level permitted on the 60-meter band for Amateur Extra licensees?
Answer: 100 watts ERP
The 60-meter band (5 MHz) is limited to 100 watts ERP relative to a half-wave dipole for all amateur licensees.
What is the effect of adding a loading coil to a mobile HF antenna that is shorter than a quarter wavelength?
Answer: It cancels the capacitive reactance, bringing the antenna to resonance
A loading coil adds inductive reactance to cancel the capacitive reactance of a short antenna, making it resonant at the desired frequency.